Arcam A32 P35 User Manual

Service Manual

A32

Issue 1.0

FMJ A32, P35 & P35/3

Ampliﬁers

ARCAM

Phono

Board

L870

Contents

ꢀ

Circuit description

Component overlay

Parts list

ꢀ

Circuit diagrams

AV8 Phono Board

Circuit Description

Refer to circuit diagram L870 sheet 1

The phono board is a simple single stage RIAA amplifier

and consists of two channels of high gain amplification,

and the ability to switch between moving magnet (MM)

and moving coil (MC) settings.

PSU

The unit derives its + 15V regulated rails from the unit it is

fitted into with only local decoupling capacitors on board.

Interface

The unit connects to the host unit via a 8 way connector.

Amplification

The left channel has designators beginning with 100, and

the right with 200. For the purposes of this description the

left channel will be described, as the right channel is the

same in all respects.

The amplifier is a small signal class A voltage feedback

amplifier with switch able gain. The input consists of an

actively loaded differential pair of very low noise PNP

transistors (TR106, TR107). These transistors are very

specific and should only be replaced with identical parts

with the E grade high gain. TR100 and TR101 form a

current source for the pair, which sets the quiescent current

for the entire amplifier. The active load consists of TR110

and TR111, which forms part of the differential current

mirror with TR112, TR113 & TR114. This differential

stage also has an active load (TR102 & TR103) to keep

gain to a maximum.

Both of these differential stages are designed to have as

much gain as possible to enable the single stage design.

The RIAA response is achieved in the feedback network:

C101, C110, C111, C112, C119, C120 and R115, R112.

C115 is used to correct between MM and MC gains as the

amplifier is non-inverting.

SW100 switches between MM and MC. Two poles of the

switch change between the different loading required for

each type of the cartridge: R108 & C109 for MM and

added in parallel for MC R104 & C108. The other two

poles change the feedback resister value to alter the gain:

R105 for MM and added in parallel for MC R123.

The DC offset is controlled by a non-inverting servo built

around IC100. The amount of servo current is different for

each gain setting via R111 (MM) and R124 (MC) so that

the low frequency high pass point remains the same for

both settings. However the high pass point for the circuit

is set by C113. This gives a warp filter, stops DC start-up

thumps from upsetting DC coupled circuitry and an

approximation of the RIAA/IEC curve (-2dB @ 20Hz)

The output is class A buffered by a dual mirror follower

(TR104, TR105, TR108, TR109). The quiescent current is

set by D100 and R118 and R119.

Closed loop stability is achieved with C16, C117, giving

symmetrical slewing capability.

L870 Phono Board Parts List Issue 2.0

Designator Part

Description

2A410

2N622

2D210

CERD 100N 63V -20% +80% RA

ELST 22U 63V

PPRO 1N0 5% 63V RA

C100

C101

C102

C103

C104

C105

C106

C107

C108

C109

C110

C111

C112

C113

C115

C116

C117

C118

C119

C120

C200

C201

C202

C203

C204

C205

C206

C207

C208

C209

C210

C211

C212

C213

C215

C216

C217

C218

C219

C220

D100

D101

D102

D200

D201

D202

IC100

IC200

PCB1

R100

R101

R102

R104

R105

R106

R108

R109

R110

R111

R112

R113

R114

R115

R116

2P710AS ELEC 100U 25V SILMIC

2K410

PEST 100N 63V 10%

2K410

PEST 100N 63V 10%

2K410

PEST 100N 63V 10%

2K410

PEST 100N 63V 10%

2D147W

2D110W

2D247N

2D310

2K510

2D213N

2D147W

2U610

2D110N

2D210

PPRO W 470P 63V 5% RA

PPRO W 100P 63V 5% RA

PPRO 4N7 63V 5% RA

PPRO 10N 63V 1% AXIAL

CAP MKS2 1U0 16V 10%

PPRO 1N3 63V 5% RA

PPRO W 470P 63V 5% RA

ELST NON POLAR 10UF 35V

PPRO 100P 63V 5% RA

PPRO 1N0 5% 63V RA

ELST 22U 63V

2N622

2D210

PPRO 1N0 5% 63V RA

2P710AS ELEC 100U 25V SILMIC

2K410

PEST 100N 63V 10%

2K410

PEST 100N 63V 10%

2K410

PEST 100N 63V 10%

2K410

PEST 100N 63V 10%

2D147W

2D110W

2D247N

2D310

2K510

2D213N

2D147W

2U610

2D110N

2D210

3A4148

5B071

PPRO W 470P 63V 5% RA

PPRO W 100P 63V 5% RA

PPRO 4N7 63V 5% RA

PPRO 10N 63V 1% AXIAL

CAP MKS2 1U0 16V 10%

PPRO 1N3 63V 5% RA

PPRO W 470P 63V 5% RA

ELST NON POLAR 10UF 35V

PPRO 100P 63V 5% RA

PPRO 1N0 5% 63V RA

SSDIODE 1N4148 75V

IC FET OPAMP TL071

5B071

L870PB_2 PRINTED CIRCUIT BOARD

1H133

1H110

1H347

1H312

1H356

1H410

1H315

1H522

RES MF W4 1% 330R

RES MF W4 1% 100R

RES MF W4 1% 47K

RES MF W4 1% 12K

RES MF W4 1% 56K

RES MF W4 1% 100K

RES MF W4 1% 15K

RES MF W4 1% 2M2

L870 Phono Board Parts List Issue 2.0

Designator Part

Description

R117

R118

R119

R120

R121

R122

R123

R124

R200

R201

R202

R204

R205

R206

R208

R209

R210

R211

R212

R213

R214

R215

R216

R217

R218

R219

R220

R221

R222

R223

R224

SK1

1H522

1H022

1H339

1H010

1H256

1H133

1H110

1H347

1H312

1H356

1H410

1H315

1H522

1H022

1H339

1H010

1H256

8D230

8K2408

A1013

4A556

4A1085

4A546

4A556

4A1085

4A546

RES MF W4 1% 2M2

RES MF W4 1% 22R

RES MF W4 1% 39K

RES MF W4 1% 10R

RES MF W4 1% 5K6

RES MF W4 1% 330R

RES MF W4 1% 100R

RES MF W4 1% 47K

RES MF W4 1% 12K

RES MF W4 1% 56K

RES MF W4 1% 100K

RES MF W4 1% 15K

RES MF W4 1% 2M2

RES MF W4 1% 22R

RES MF W4 1% 39K

RES MF W4 1% 10R

RES MF W4 1% 5K6

PHONO SKT 2-WAY HOR EMC GOLD

8-WAY AMP CT CONN

SW PUSH 4PCO

TRANS LF SS P BC556B

TRANS LF SS P 2SA1085

TRANS LF SS N BC546B

TRANS LF SS P BC556B

TRANS LF SS P 2SA1085

TRANS LF SS N BC546B

SK2

SW100

TR100

TR101

TR102

TR103

TR104

TR105

TR106

TR107

TR108

TR109

TR110

TR111

TR112

TR113

TR114

TR200

TR201

TR202

TR203

TR204

TR205

TR206

TR207

TR208

TR209

TR210

TR211

TR212

TR213

TR214

LEFT CHANNEL

L870C2_2.0.SCH

+15V

Q_5

Q_1

Q_3

SK1

PHONO2HG

LEFT IN

LEFT OUT

SK2

0V_SIG

Q_2

EMC

RIGHT CHANNEL

L870C3_2.0.SCH

100N CD

Q_4

Q_6

RIGHT IN

RIGHT OUT

0V_SIG

AMPCT8

Q_8

Q_7

0V_SIG

-15V

0V_HF

DRAWING TITLE

PCB1

EL1

A85 PHONO STAGE - TOP LEVEL

PCB

Update Box

Circuit Diagram

UPDATE_BOX

L870PB_2

2 3 4 2 5

Notes:

01_1070

00_1051

JAG

17/4/01

updated pcb and scm

A & R Cambridge Ltd.

Pembroke Avenue

Denny Industrial Centre

Waterbeach

22/3/01

PRODUCTION ISSUE

ECO No. INITIALS

Date Printed

G:\DATA\ECO\ECO AGENDA\01_1070 l870 A85 PHONO ISSUE2\L870_2.0.ddb - L870c1_2.0.PRJ

DATE

DESCRIPTION OF CHANGE

ISSUE

Drawn by:

JBR

Filename

Cambridge CB5 9PB

Sheet 1 of 3

DRAWING NO. L870C1

23-Apr-2001

+15V

Q_102

C102

100U SILMIC

C104

100N PE

C119

0V_HF

R101

100R MF

0V_SIG

R100

R102

330R MF

100R MF

100P PP

C101

TR100

BC556B

TR102

BC556B

TR103

1N0 PP

BC556B

C110

TR101

BC556B

+ C100

22U EL

4N7 PP

C120

1N0 PP

C112

R109

12K MF

TR108

TR109

BC546B

10N PP AX

C111

R115

R110

12K MF

15K MF

10N PP AX

R118

22R MF

LEFT IN

R112

D100

100K MF

1N4148

C106

100N PE

SW100B

4PCO

C113

C105

100N PE

C115

1N3 PP

R116

LEFT OUT

1U0 PE

2M2 MF

R119

22R MF

TR106

2SA1085

TR107

IC100

R122

39K MF

2SA1085

R117

2M2 MF

C118

Q_101

R111

56K MF

10U NP

TL071CD

R124

5K6 MF

SW100D

4PCO

R113

100K MF

0V_SIG

R108

47K MF

TR104

TR105

BC556B

C109

100P PPW

R104

100R MF

C108

470P PPW

R114

10R MF 100K MF

R105

100R MF

R123

C117

470P PPW

C116

0V_SIG

470P PPW

TR112

BC546B

TR113

BC546B

TR110

BC546B

TR111

BC546B

TR114

BC546B

D101

1N4148

D102

1N4148

R106

100R MF

C107

100N PE

R120

22R MF

R121

22R MF

0V_HF

C103

100U SILMIC

0V_SIG

Q_103

-15V

DRAWING TITLE

A85 PHONO STAGE - LEFT CHANNEL

Circuit Diagram

2 3 4 2 5

Notes:

01_1070

00_1051

JAG

17/4/01

updated pcb and scm

A & R Cambridge Ltd.

Pembroke Avenue

Denny Industrial Centre

Waterbeach

22/3/01

PRODUCTION ISSUE

ECO No. INITIALS

Date Printed

DATE

DESCRIPTION OF CHANGE

ISSUE

Drawn by:

JBR

Filename

Cambridge CB5 9PB

Sheet 2 of 3

DRAWING NO. L870C2

_{G:\DATA\ECO\ECO AGENDA\01_1070 l870 A85 PHONO ISSUE2\L870_2.0.ddb - L870C2_2.0.SCH}23-Apr-2001

+15V

Q_202

C202

100U SILMIC

C204

100N PE

C219

0V_HF

R201

100R MF

0V_SIG

R200

R202

330R MF

100R MF

100P PP

C201

TR200

BC556B

TR202

BC556B

TR203

1N0 PP

C210

BC556B

TR201

BC556B

4N7 PP

C220

+ C200

22U EL

1N0 PP

C212

R209

12K MF

TR208

TR209

BC546B

10N PP AX

C211

R215

R210

12K MF

15K MF

10N PP AX

R218

22R MF

RIGHT IN

R212

D200

100K MF

1N4148

C206

100N PE

SW100A

4PCO

C213

C205

100N PE

C215

R216

RIGHT OUT

1N3 PP

1U0 PE

2M2 MF

R219

22R MF

TR206

2SA1085

TR207

IC200

R222

39K MF

2SA1085

R217

2M2 MF

Q_201

R211

56K MF

TL071CD

C218

10U NP

SW100CR224

4PCO 5K6 MF

R213

100K MF

0V_SIG

R208

47K MF

TR204

TR205

BC556B

C208

C209

R204

100R MF

100P PPW

R214

10R MF 100K MF

R205

R223

100R MF

470P PPW

C217

470P PPW

C216

470P PPW

0V_SIG

TR212

BC546B

TR213

BC546B

TR210

BC546B

TR211

BC546B

TR214

BC546B

D201

1N4148

D202

1N4148

R206

100R MF

C207

100N PE

R220

22R MF

R221

22R MF

0V_HF

C203

0V_SIG

100U SILMIC

Q_203

-15V

DRAWING TITLE

A85 PHONO STAGE - RIGHT CHANNEL

Circuit Diagram

2 3 4 2 5

Notes:

01_1070

00_1051

JAG

17/4/01

updated pcb and scm

A & R Cambridge Ltd.

Pembroke Avenue

Denny Industrial Centre

Waterbeach

22/3/01

PRODUCTION ISSUE

ECO No. INITIALS

Date Printed

DATE

DESCRIPTION OF CHANGE

ISSUE

Drawn by:

JBR

Filename

Cambridge CB5 9PB

Sheet 3 of 3

DRAWING NO. L870C3

_{G:\DATA\ECO\ECO AGENDA\01_1070 l870 A85 PHONO ISSUE2\L870_2.0.ddb - L870C3_2.0.SCH}23-Apr-2001

Amplifier + PSU

Board

L882

Contents

ꢀ

Circuit description

Component overlay

Parts list

ꢀ

Circuit diagrams

rails will vary with mains input and load conditions. The

current is around 20mA per relay.

Amplifier & PSU Circuit Description

Refer to L882 circuit diagrams

Star point SP100 is the ground ‘mecca’ for the entire

amplifier (comprising all three PCBs within the unit). All

of the separately named grounds are joined explicitly at

this point. Different named grounds are used to ensure that

no two ‘different’ grounds share copper, which could

compromise the noise, distortion or crosstalk performance

of the amplifier.

This is the printed circuit board that provides the power

supply and output stage amplifiers for the A32 integrated and

P35 power amplifiers.

Its function is to:

ꢀ

Drive the loudspeakers

Provide an (always on) auxiliary 5VDC supply for the

micro controller and display interface

The loudspeaker output signals are passed to socket

SK106 which connects to SK107 and onto the headphone

output via the attenuation resistors R103 thru R106.

ꢀ

Receive logic signals from the micro controller to turn

on the main amplifier supply relay (mains) and connect

either pair of speaker output sockets

Send logic signals to the micro controller pertaining to

the state of the amplifiers (short circuit protection, DC

offset protection, thermal protection)

Receive and demodulate RC5 remote style control

codes via the rear panel jack and transmit them to the

micro controller

The hierarchy containing the other sheets is self

explanatory. Each of the port names shown on the top

sheet connects to the port of the same name on the lower

sheets.

L882 Circuit Sheet 2

ꢀ

Send a 12V trigger output via the rear panel jack for

control of an auxiliary power amp when the unit is on

Receive a 12V trigger input from the rear jack (for use

in the power amp only version)

Drive a pair of headphones via attenuating resistor

networks The power amplifier is a symmetrical, class B,

bipolar junction transistor output, current-feedback

design (of which more later) with DC-coupled signal

and feedback paths, featuring an active integrating

voltage servo to control DC offsets.

This sheet contains the power supplies, the rear panel jack

socket trigger circuits, the standby relay control and the

‘interface’circuits between the output signals of the power

amplifiers and the inputs expected by the micro processor.

The mains input enters the unit at SK203, with capacitors

C205 and C206 acting as conducted RF suppression. The

earth connection is passed on to the chassis (for safety

reasons the chassis metalwork remains connected to mains

power earth at all times). Switch SW200 is the voltage

selector switch, allowing the unit to be operated in 230V

or 115V mains countries by switching the dual-primary

mains transformers between series and parallel winding.

Varistors VR200 and VR201 act to prevent over-voltage

surges from damaging the unit. If the user selects 115V

operation and then connects the unit to a 230V supply, the

varistors will go to a low impedance and blow the primary

fuses. Any very high voltage line transients will also be

suppressed, helping to eliminate transformer isolation

breakdown.

It features ‘instantaneous’ safe operating area protection in

addition to sending a signal to the micro to turn off the output

relays in the event of user or thermal overload. Since it is a

DC-coupled design, the unit senses DC at the output and

triggers the micro to turn off the loudspeaker relays in the

event of excessive levels (possibly due to a faulty source

component or short circuit output transistor).

The output stage uses Sanken specialised ‘audio amplifier’

power bipolar Darlington transistors which are optimised for

use with this type of topology. Consequently the unit has

excellent measured performance in terms of noise, slew rate,

output impedance and distortion (harmonic and

intermodulated) and is essentially load invariant (to a first

order the measured performance is independent of the load

impedance).

Relay RLY200 switches the primary side of the mains

transformer, allowing the micro to control the on / off

status of the amplifier. Its contacts are snubbed by

capacitors C207 and C208 (to eliminate switching spark

transients and prolong relay lifespan). The primary

windings of the toroidal mains transformer connect to

SK204.

L882 Circuit Sheet 1

The audio input to the amplifier is connected to SK102

(which connects to the output of the preamp PCB). This

signal is passed on via SK104A which forms the preamp out

connection to the outside world.

PCB mounted transformer TX200 is powered all the time

that mains is present on SK203, irrespective of the on / off

status of the amplifier. This is to ensure that the micro

processor is always operational and can thus control the

mains switching for the main amplifier. Secondary fuse

F202 limits the current in the event of a failure mode, as

the short circuit primary current of TX200 would be

insufficient to blow the mains fuses.

SK104B provides the power amp input connection, with

switchSW100 selecting between pre / power and integrated

modes. The unit is wired as a preamp

power amp

combination with the switch depressed, allowing the user to

insert a processor or other function (e.g. graphic EQ) between

the output of the preamp and the input of the power amp.

With the switch in the ‘out’ position the power amp input

socket is ignored and the input to the power amp is connected

internally to the output of the preamp. PL100 and PL101 are

‘handbag’ links fitted to the power amp only version to

connect both pairs of phono sockets in parallel for daisy

chaining (as there is no preamp output on a power amp).

Diodes D200 thru D203, C227 and IC201 provide the

5VDC supply which powers the micro and display PCB

and the relay coils. C224 is to reduce diode noise being

transmitted back through the leakage capacitance of

TX200.

The mains transformer secondary winding is connected to

SK200. This is a centre tapped winding, and is used with

full bridge rectifier BR200 to produce the main positive

and negative supplies for the power amp. C209 and C210

are the large reservoir capacitors, with C211 and C212

acting as high frequency decouplers. The main power

supply rails and ground are accessible on SK205 for future

module expansion.

Relays RLY100 and RLY101 switch the two pairs of

loudspeaker output sockets and are controlled by the micro

lines describes above. Transistors TR100 and TR101 operate

in ‘constant current sink’ mode which allow relay current to

be approximately constant although the main power supply

The circuitry around SK201A and IC200 is to receive and

demodulate remote control commands sent in via the rear

panel jack socket. This is for multi-room applications. L200

and C200 form a parallel resonant circuit at approximately

37kHz. The output from this bandpass filter is passed into

IC200A where it is ‘chopped’ and fed to IC200B to provide

the output signal.

the feedback resistors that sets the overall gain of the

amplifier.

IC300B acts as an inverting integrator and its purpose is to

remove DC from the loudspeaker output. Any positive DC

offset will cause the output of IC300B to go negative, thus

increasing the current in its negative supply pin and

pulling the output voltage back towards zero. R330 and

C317 set the time constant of this integrator (0.47 seconds)

so that audio frequency components are ignored and only

DC and subsonic frequencies are removed.

SK201B is a 13VDC signal trigger output which is active

whenever the amplifier is powered up. R218 and DZ207 /

C223 provide a reference voltage which is buffered by

TR200. TR201 and R217 act as a current limit and prevent

damage due to a short circuit on the output of SK201B. The

maximum current is approximately 65mA.

The input to the amplifier is limited to ±5.4V via back-to-

back zener diodes DZ302 and DZ303. This is to prevent

the user from grossly overdriving the input to the amplifier

and possibly causing damage. The diodes appear before

series resistor R324 so that their variable capacitance does

not introduce high frequency harmonic distortion.

TR203 and TR202 are a complementary Darlington pair

which turn on mains relay RLY200 when activated by a

signal from the microprocessor.

R324, R327 and C316 act as an input filter - this is a first

order low pass filter with a corner frequency of around

340kHz to prevent RF signals from being injected into the

front end of the amplifier. The corner frequency was

chosen such that the phase shift introduced is less than 5˜

at 20kHz (considered by the AES to be the minimum

perceptible relative amount by the human ear). The input

impedance of the amplifier is 23kW at DC, falling to

around 14kW at 20kHz.

TR204 and its associated components are to detect whenever

AC mains is present at the IEC socket. This is to notify the

microprocessor if the user has unplugged the mains cord, so

that it can take the necessary action (muting all the outputs

and switching off the mains relay). The reservoir capacitors

should last at least

mains cycles which gives the

microprocessor plenty of time for a controlled shutdown.

TR204 forms a monostable circuit. Each cycle of AC turns on

TR204 via R211. TR204 then ‘shunts’ C229 ensuring that it

is kept at a low potential. If more than one mains cycle is

missing, then R219 charges up C229 sufficiently to trigger

Schmitt inverter IC202E thus passing on a logic signal to the

microprocessor. The use of a Schmitt inverter for IC202 is to

ensure that the micro receives ‘clean’ logic levels - the

hysteresis voltage (about 0.5V) is sufficient to prevent circuit

noise from producing a string of ‘ghost’ signals when

analogue levels are near the threshold point.

Operational amplifier IC300A is acting as a non-inverting

gain of 2, driving the input signal into a 44W impedance to

ground via R322 and R337. Its output voltage will be an

accurate amplification of its input voltage (i.e. the signal

on pin 1 should look identical to that on pin 3 but at twice

the amplitude). The op-amp is used in a slightly unusual

configuration here, in that its power supply pins are used

as a (current) output, and its output pin is used as a

(current) feedback.

TH200 is a positive tempco thermistor placed adjacent to the

heatsink on which the output transistors are mounted. When

the temperature of the thermistor exceeds 90 degrees Celsius

the thermistor goes to a high impedance and so the input to

IC202F goes low. This triggers a HIGH output to the micro

indicating thermal overload.

Transistors TR311 and TR303 supply the ±15V rails to the

op-amp, and act as cascades to pass its supply pin currents

through to the current mirrors, which sit at a potential too

high for the op-amp to be connected directly.

TR300, TR301 and TR321 form a PNP Wilson current

mirror, which reflects the current sunk by the positive

supply pin of IC300. Likewise TR314, TR315 and TR320

form an NPN Wilson current mirror, which reflects the

current sourced by the negative supply pin of IC300.

The VI protection signals from the left and right channels

pass into IC202A and IC202B respectively, to be ‘cleaned

up’ via the Schmitt trigger. They are then NOR’d using

TR205 which sends a HIGH signal to the micro in the event

of either channel suffering a short circuit or current overload.

Exactly the same approach is used for the DC fault lines

using IC202C and IC202D.

R315 thru R318 provide emitter degeneration of

approximately 300mV for the current mirrors (as they pass

about 3mA DC in quiescent conditions), to ensure accurate

operation independent of the small variations between the

transistors in the current mirrors. They also ensure that the

current passing down the next stage is reasonably constant

as the internal temperature of the amplifier changes,

swamping out small thermal variations in the ^VBEof the

mirror transistors.

L882 Circuit Sheet 3

This is the main audio power amplifier circuit. The amplifier

is a class B design, which uses SAP ‘audio’ transistors in a

symmetrical current feedback configuration. Input and

feedback paths are DC coupled and there is an active

integrating servo to remove DC offsets from the output.

R319 and R320 slightly decouple the rails to the current

mirrors from the main power rails of the amplifier, to

allow the bootstrap circuit to operate. The bootstrap

consists of C302 and C306 with metal film power resistors

R352 and R353. The bootstrap is provided to allow the

power supply rails of the current mirrors to go up and

down slightly with the output signal into the loudspeaker.

This enables the driver stage to fully saturate the output

transistors and thus give the greatest power output and best

thermal efficiency for any given power rail voltage. The

voltage on the ‘inside’ end of R319 and R320 will vary by

about 12 volts peak to peak at full output power, rising

above the main power rails during signal peaks.

The basic principle of operation is follows:

The input signal is amplified by a factor of 2 in IC300A. This

drives a 44˜ impedance to ground causing the supply pin

currents to change with the signal level. These changing

supply pin currents are then ‘reflected’ by

pair of

complementary Wilson mirrors and passed on to a series of

buffer transistors before being connected to the load. The

‘feedback current’ flows back from the output terminal via

R331 and R332 and attempts to provide the current necessary

to allow IC300A to swing its output without drawing

excessive current from its supply pins, thus making the

change in supply current very small indeed. This is why the

term ‘current feedback’ is used - it is the current flowing in

C307 and C308 with R333 and R335 provide the

compensation necessary to ensure stability when the loop is

closed. They are Miller capacitors which dramatically reduce

the transimpedance (i.e. current to voltage gain) of the current

mirrors at high frequencies. The present value of 47pF

provides for a unity gain open loop bandwidth of around

75MHz, whilst ensuring a closed loop gain margin of around

6dB (note that gain margin in a current feedback design is not

R308, R314 and C320 form a low pass filter from which

the DC detection circuits can sense excessive DC at the

loudspeaker outputs. If there is any positive DC present,

then TR316 will turn on, which turns on TR305 and thus

activates the DC protection line to the micro, turning off

the loudspeaker relays.

dependent on system bandwidth to

first order

If there is any negative DC present, then TR308 will turn

on, which turns on TR317 which then turns on TR305 in

turn, causing the same effect.

approximation). R333 and R335 provide a ‘zero’ in the open

loop frequency response which is tailored to give the best

time domain performance (i.e. to make high frequency square

waves look square with minimal ringing or overshoot).

R350 and C319 are the Zobel network which is provided

to ensure the amplifier ‘sees’ a constant and resistive load

at very high frequencies, to aid stability, although the

amplifier will be stable without the Zobel fitted.

DZ304 and C311 provide a fixed 4.7V bias voltage to allow

the following stages to operate correctly. C311 is there to

ensure that both halves of the following stage receive an

equal AC signal component at high frequency.

C313 locally couples the ‘high frequency’ and loudspeaker

ground returns together at the output to overcome the

effects of track inductance back to the star point. C309

couples the ‘high frequency’ and signal grounds together

at the input for the same reason.

TR310 and TR307 are the ‘pre-driver’ transistors, which act

to buffer the outputs from the preceding stage and drive the

Darlington output power transistors. TR309 and R321 act as a

current limit, to ensure that the emitter current of TR310 does

not exceed 30mA in a fault condition. TR306 and R323

provide the same function for TR307.

D303 and D304 are ‘flyback’ diodes to protect the output

transistors from reverse bias when the amplifier is heavily

clipped into an inductive load (such as a loudspeaker voice

coil!)

R338 and R339 are to loosely couple the outputs of the pre-

driver stage to the inputs of the Darlington power output

devices. This is so that the inbuilt temperature sensing diodes

of the output transistors can accurately control the quiescent

current of the output stage as the junction temperature of the

power devices varies. C312 and C318 ensure that both halves

of the output stage receive an equal AC signal component.

Sheet 4 is an identical copy of sheet 3 so I will not

describe it separately.

The output transistors are TR318 and TR319. These are

Sanken SAP15N and SAP15P devices respectively. They are

specially designed for audio power amplifier use. In addition

to high current gain (Darlington with a typical ^hFEof 20,000)

they provide an inbuilt emitter resistor (thick film power

resistor of 0W22) and temperature sensing diodes which

closely and rapidly track the VBE versus temperature

characteristic of the power transistors, allowing for easy, fast-

responding and reasonably accurate control of quiescent

current.

RV300 is for fine trimming of the quiescent current. PL300

provides a convenient measuring point for this, which is

short-circuit protected in the event of a slip with the

multimeter probe! All of the remaining circuitry to the right

of TR318 and TR319 is essentially for output stage

protection...

Transistors TR312 and TR304, along with the network of

resistors and capacitors to which they are connected, provide

instantaneous overload protection of the output stage. This is

a conventional single slope VI protection scheme, which

allows much greater current to be delivered into a rated load

than into a short circuit. The values allow for 18A peak

delivery (at clip) into a purely resistive load, 7A peak (at clip)

into a purely capacitive load and around 4A peak into a short

circuit. R345, C303, R346 and C304 allow these values to be

doubled for short transient bursts (approximately 2.7

milliseconds) so that impulsive musical transients can be

delivered cleanly with minimal risk of damaging the output

transistors.

TR313, TR302 and their associated components send a signal

to the microprocessor when the instantaneous protection

circuits are having to work ‘hard’ to prevent amplifier

overload. This instructs the micro that the user is severely

abusing the amplifier and will switch off the loudspeaker

relays to prevent possible permanent damage. In reality, if

you short circuit the outputs at any appreciable volume level,

this circuit will trigger and the microprocessor will turn off

the loudspeaker relays and send a signal to the user.

L882 Amplifier and PSU Board Parts List Issue 3.0

Designator Part

Description

BR200

C100

C200

C201

C202

C203

C204

C205

C206

C207

C208

C209

C210

C211

C212

C213

C214

C215

C216

C217

C218

C219

C220

C221

C222

C223

C224

C225

C226

C227

C228

C229

C230

C231

C232

C233

C234

C235

C300

C301

C302

C303

C304

C305

C306

C307

C308

C309

C310

C311

C312

C313

C314

C315

C316

C317

C318

C319

C320

C400

C401

C402

3BGBU8D

2C210

2D168

2C410

2K233

2N910A

2H410

2C310

2C410

2C310

2N610

2A410

2N833

2N810A

2N622

2C310

2C210

2C410

2N610

2D422

2C210

2N710

2N710B

2N710

2N610

2N710B

2C110

2C410

2H410

2C310

2C410

2D147W

2K447

2N610

2K410

2V710

2N710

2N710B

BRIDGE RECTIFIER 8A 200V

MLC 1N0 50V X7R 10% SM

PPRO 680P 5% 63V RA

MLC 100N 50V X7R 10% SM

SUPPR CAP 3N3 250V

ELST 10m 63V RA 35mm

PCRB 100N 100V 10% RA 5mm

MLC 10N 50V X7R 10% SM

MLC 100N 50V X7R 10% SM

MLC 10N 50V X7R 10% SM

ELST 10U 50V

CERD 100N 63V 20% RA

ELST 3M3 25V

ELST 1M0 10V

ELST 22U 63V

MLC 10N 50V X7R 10% SM

MLC 1N0 50V X7R 10% SM

MLC 100N 50V X7R 10% SM

ELST 10U 50V

220NF CLASS X2 CAP 275VRMS

MLC 1N0 50V X7R 10% SM

ELST 100U 25V

ELST 100U 100V

ELST 100U 25V

ELST 10U 50V

ELST 100U 100V

MLC 100P 50V NPO 5% SM

MLC 100N 50V X7R 10% SM

PCRB 100N 100V 10% RA 5mm

MLC 10N 50V X7R 10% SM

MLC 100N 50V X7R 10% SM

PPRO W 470P 63V 5% RA

PEST 470N 63V 10%

ELST 10U 50V

PEST 100N 63V 10%

ELST NON POLAR 100UF 16V

ELST 100U 25V

ELST 100U 100V

L882 Amplifier and PSU Board Parts List Issue 3.0

Designator Part

Description

C403

C404

C405

C406

C407

C408

C409

C410

C411

C412

C413

C414

C415

C416

C417

C418

C419

C420

D100

D101

D200

D201

D202

D203

D205

D206

D300

D301

D302

D303

D304

D400

D401

D402

D403

D404

DZ204

DZ207

DZ300

DZ301

DZ302

DZ303

DZ305

DZ306

DZ400

DZ401

DZ402

DZ403

DZ405

DZ406

2N710

2N610

2N710B

2C110

2C410

2H410

2C310

2C410

2D147W

2K447

2N610

2K410

2V710

3B4003

3AS16W

3B4003

3AS16W

3B4003

3CW34V7

3CW315V

3CW34V7

3CW315V

3CW34V7

8M101

ELST 100U 25V

ELST 10U 50V

ELST 100U 100V

MLC 100P 50V NPO 5% SM

MLC 100N 50V X7R 10% SM

PCRB 100N 100V 10% RA 5mm

MLC 10N 50V X7R 10% SM

MLC 100N 50V X7R 10% SM

PPRO W 470P 63V 5% RA

PEST 470N 63V 10%

ELST 10U 50V

PEST 100N 63V 10%

ELST NON POLAR 100UF 16V

RECTIFIER 1N4003F 1A 200V

DIODE SS SM BAS16W

RECTIFIER 1N4003F 1A 200V

DIODE SS SM BAS16W

RECTIFIER 1N4003F 1A 200V

ZENER 4V7 OW 35 SM SOT23

ZENER 15V OW35 SM SOT23

ZENER 4V7 OW 35 SM SOT23

ZENER 15V OW35 SM SOT23

ZENER 4V7 OW 35 SM SOT23

EARTH LEAD

F200

F201

F202

C12207

F022

8S004

F022

8S004

FUSE 20mm 2A AS

INS COVER PCB FUSEHOLDER

FUSEHOLDER 20mm PCB

INS COVER PCB FUSEHOLDER

FUSEHOLDER 20mm PCB

FUSE 20mm 2A AS

C12207

C3501

FUSE R452 T500mA

HS200

IC200

IC201

F008

F006

5M393AD

5D7805

HEATSINK TO220 8.6 DEGC/W

HEATSINK CLIP TO220 13/8.6 DC/W

IC COMPARATOR SM DUAL LM393A

IC VREG POS 7805

L882 Amplifier and PSU Board Parts List Issue 3.0

Designator Part

Description

IC202

IC300

IC400

L200

L300

L400

PCB

5J7414D

5B072D

7D327

7D002C

L882PB_3

8K6201

1H010

SURFACE MOUNT HEX SCHMITT TRIGGER

IC AUDIO SM DUAL TL072

27mH INDUCTOR

INDUCT 2U2 12x20mm

PRINTED CIRCUIT BOARD

PL100

PL101

PL300

PL400

R100

R101

R102

R103

R104

R105

R106

R107

R108

R200

R201

R202

R203

R204

R205

R206

R207

R208

R209

R210

R211

R212

R213

R214

R215

R216

R217

R218

R219

R220

R221

R222

R223

R224

R225

R226

R227

R228

R229

R230

R231

R300

R301

R302

R303

R304

R305

R306

R307

R308

R309

2WAY MOLEX VERT MALE CONNECTOR

RES MF W4 1% 10R

1A110

RES SM W4 1% 100R 1206

1.00E+133 RES CF 1W 330R 5%

1.00E+110 RES CF 1W 100R 5%

1A122

RES SM W4 1% 220R 1206

RES SM W4 1% 1K0 1206

RES SM W4 1% 10K 1206

RES SM W4 1% 4K7 1206

RES SM W4 1% 10R 1206

RES SM W4 1% 10K 1206

RES SM W4 1% 1K8 1206

RES SM W4 1% 10R 1206

RES SM W4 1% 10K 1206

RES SM W4 1% 1K8 1206

RES SM W4 1% 470R 1206

RES SM W4 1% 1K0 1206

RES SM W4 1% 100K 1206

RES SM W4 1% 1K5 1206

RES W25 5% VR25 1M5

RES SM W4 1% 10K 1206

1A122

1A210

1A310

1A247

1A010

1A310

1A218

1A010

1A310

1A218

1A147

1A210

1A410

1A215

1K515

1A310

L882 Amplifier and PSU Board Parts List Issue 3.0

Designator Part

Description

R310

R311

R312

R313

R314

R315

R316

R317

R318

R319

R320

R321

R322

R323

R324

R325

R326

R327

R328

R329

R330

R331

R332

R333

R334

R335

R336

R337

R338

R339

R340

R341

R342

R343

R344

R345

R346

R347

R348

R349

R350

R351

R352

R353

R354

R355

R400

R401

R402

R403

R404

R405

R406

R407

R408

R409

R410

R411

R412

R413

R414

R415

1A247

1A310

1A247

1A110

1A022

1A210

1A322

1A247

1A510

1A215

1A218

1A233

1A322

1A233

1A322

1A022

1A115

1A410

1A133

1A110

1A000

1A110

1C856

1H010

1J147

1A210

1A268

1A310

1A247

1A310

1A247

1A110

RES SM W4 1% 4K7 1206

RES SM W4 1% 10K 1206

RES SM W4 1% 4K7 1206

RES SM W4 1% 100R 1206

RES SM W4 1% 22R 1206

RES SM W4 1% 1K0 1206

RES SM W4 1% 22K 1206

RES SM W4 1% 4K7 1206

RES SM W4 1% 1M0 1206

RES SM W4 1% 1K5 1206

RES SM W4 1% 1K8 1206

RES SM W4 1% 3K3 1206

RES SM W4 1% 22K 1206

RES SM W4 1% 3K3 1206

RES SM W4 1% 22K 1206

RES SM W4 1% 22R 1206

RES SM W4 1% 150R 1206

RES SM W4 1% 100K 1206

RES SM W4 1% 330R 1206

RES SM W4 1% 100R 1206

RES SM W4 1% 0R0 1206

RES SM W4 1% 100R 1206

RES CF 2W 5R6 5%

RES MF W4 1% 10R

RES 2W MF 5% 470R

RES SM W4 1% 1K0 1206

RES SM W4 1% 6K8 1206

RES SM W4 1% 10K 1206

RES SM W4 1% 4K7 1206

RES SM W4 1% 10K 1206

RES SM W4 1% 4K7 1206

RES SM W4 1% 100R 1206

L882 Amplifier and PSU Board Parts List Issue 3.0

Designator Part

Description

R416

R417

R418

R419

R420

R421

R422

R423

R424

R425

R426

R427

R428

R429

R430

R431

R432

R433

R434

R435

R436

R437

R438

R439

R440

R441

R442

R443

R444

R445

R446

R447

1A110

1A022

1A210

1A322

1A247

1A510

1A215

1A218

1A233

1A322

1A233

1A322

1A022

1A115

1A410

1A133

1A110

1A000

1A110

1C856

1H010

1J147

1A210

1A268

A207

RES SM W4 1% 100R 1206

RES SM W4 1% 22R 1206

RES SM W4 1% 1K0 1206

RES SM W4 1% 22K 1206

RES SM W4 1% 4K7 1206

RES SM W4 1% 1M0 1206

RES SM W4 1% 1K5 1206

RES SM W4 1% 1K8 1206

RES SM W4 1% 3K3 1206

RES SM W4 1% 22K 1206

RES SM W4 1% 3K3 1206

RES SM W4 1% 22K 1206

RES SM W4 1% 22R 1206

RES SM W4 1% 150R 1206

RES SM W4 1% 100K 1206

RES SM W4 1% 330R 1206

RES SM W4 1% 100R 1206

RES SM W4 1% 0R0 1206

RES SM W4 1% 100R 1206

RES CF 2W 5R6 5%

R448

R449

R450

R451

R452

R453

R454

R455

RES MF W4 1% 10R

RES 2W MF 5% 470R

RES SM W4 1% 1K0 1206

RES SM W4 1% 6K8 1206

RELAY G5Z-2A-E 24V

RLY100

RLY101

RLY200

RV300

RV400

SH200

SK100

SK101

SK102

SK103

SK104

SK105

SK106

SK107

SK200

SK201

SK202

SK203

SK204

SK205

SW100

SW200

A207

A219

RELAY G5Z-2A-E 24V

RELAY MAINS DPDT 5V 5A

PRES 100R LIN HORIZ

MAINS EMC SHIELD

CAMCON BINDING POST 4WAY GOLD

4-WAY AMP CT CONN

FFC 14W 2.54MM VER PTH

PHONO SKT 4-WAY EMC GOLD

STEREO JACK PCB

6F110

E5402

8D418G

8K2404

8K7014

8D225

8D301

8K2404

8K2306

8D302

8Q003

8A001

8K2308

8K2406

A1008

A1404

4-WAY AMP CT CONN

MOLEX MINI FIT HCS 6 WAY

MIN JACK DUAL 3.5mm HSJ1002-01-1020

CAGE CLAMP 16A 1 WAY ARC003-236

IEC MAINS CONN PCB INS PX

MOLEX MINI FIT HCS 8 WAY

6-WAY AMP CT CONN

SW PUSH 2PCO

VOLTAGE SELECTOR SLIDE SWITCH

L882 Amplifier and PSU Board Parts List Issue 3.0

Designator Part

Description

TH200

TR100

TR101

TR200

TR201

TR202

TR203

TR204

TR205

TR206

TR300

TR301

TR302

TR303

TR304

TR305

TR306

TR307

TR308

TR309

TR310

TR311

TR312

TR313

TR314

TR315

TR316

TR317

TR318

TR319

TR320

TR321

TR322

TR400

TR401

TR402

TR403

TR404

TR405

TR406

TR407

TR408

TR409

TR410

TR411

TR412

TR413

TR414

TR415

TR416

TR417

TR418

TR419

TR420

TR421

TR422

TX200

1T002

4B179

THERMISTOR SIEMENS B59008

NPN TRANS MP BD179

4AFMMT497 TRANS LF SS N SM FMMT497

4AFMMT597 TRANS LF SS P SM FMMT597

4AFMMT497 TRANS LF SS N SM FMMT497

4A849B

4A856B

TRANS LF SS N SM BC849B

TRANS LF SS P SM BC856B

4AFMMT597 TRANS LF SS P SM FMMT597

4AFMMT497 TRANS LF SS N SM FMMT497

4CSAP15N TRANS POWER NPN SAP15N

4CSAP15P

TRANS POWER PNP SAP15P

4AFMMT497 TRANS LF SS N SM FMMT497

4AFMMT597 TRANS LF SS P SM FMMT597

4AFMMT497 TRANS LF SS N SM FMMT497

4AFMMT597 TRANS LF SS P SM FMMT597

4AFMMT497 TRANS LF SS N SM FMMT497

4CSAP15N TRANS POWER NPN SAP15N

4CSAP15P

TRANS POWER PNP SAP15P

4AFMMT497 TRANS LF SS N SM FMMT497

4AFMMT597 TRANS LF SS P SM FMMT597

4AFMMT497 TRANS LF SS N SM FMMT497

7A9301

TRANSFORMER 3VA 9V+9V TYPE 9301

L882C3

0V_SIG

L882C3_4.1.SCH

L SIG

VIPROT_L

DCPROT_L

LS L

0V_TRIG

0V_D

0V_HF_R

0V_LS_R

0V_LS_L

0V_PSU

INPUT

0V_SIG

0V_LS

0V_HF

VPOS

VNEG

VIPROT

DCPROT

OUTPUT

0V_SIG

0V_LS_L

0V_HF_L

+49V

TP121

L882C2

L882C2_4.1.SCH

0V_D

0V_PSU

0V_HF_L

-49V

+5V_D

+49V

-49V

THERMPROT

VIPROT

AC PRESENT

DCPROT

REMOTE

TRIGGER

0V_D

+5V(D)

VPOS

VNEG

SP100

STAR_8

0V_PSU

PWRON

VIPROT_L

VIPROT_R

0V_TRIG

DCPROT_L DCPROT_uC

DCPROT_R

STANDBY

VIPROT_L

VIPROT_R

0V_TRIG

DCPROT_L

DCPROT_R

THPROT_uC

VIPROT_uC

AC_PRES

L882C4

L882C4_4.1.SCH

R SIG

VIPROT_R

DCPROT_R

LS R

INPUT

0V_SIG

0V_LS

0V_HF

VPOS

VNEG

VIPROT

DCPROT

OUTPUT

RC5 IN

TRG IN

0V_SIG

0V_LS_R

0V_HF_R

+49V

-49V

+49V

SW100A

2PCO

LS L

RLY100C

RLY G5Z-2A-E

RLY101C

RLY G5Z-2A-E

D100

1N4003F

D101

1N4003F

TP101

L SIG

R SIG

SK106

PL100

0V_LS_L

LS R

TP102

SK104B

SK104A

SK102

AMPCT4

TP118

TR101

BD179

R101

TR100

BD179

SPKR1 ON

SPKR2 ON

TP100

SK107

100R SM

R103

FROM PREAMP

EMC

330R 1W CF

R104

SK105

0V_SIG

C100

TP119

R102

AMPCT4

1N0 SM

330R 1W CF

100R SM

PHONO4G

TP120

PL101

HPSKT

AMPCT4

R105

R106

0V_SIG

100R 1W CF 100R 1W CF

R107

220R SM

R108

220R SM

0V_SIG

SW100B

2PCO

0V_D

INTEGRATED / PRE-POWER

MODE SELECT SWITCH

SK100A

SK100B

Bot+

RLY100A

RLY101A

LS L

Top+

TP111

TP113

RLY G5Z-2A-E

TP115

RLY G5Z-2A-E

+5V_D

+49V

PCB

0V_LS_L

PCB

Top-

Bot-

R100

SK103

CAMCON_G

L882PB_4

10R MF

EARTH LEAD

8M101

STANDBY

SPKR1 ON

SPKR2 ON

THERMPROT

VIPROT

TP103

TP104

TP105

TP106

TP107

TP108

TP109

TP110

TP117

SK101A

Top+

SK101B

Bot+

RLY100B

RLY101B

EARTH LEAD

LS R

TP112

TP114

TP116

RLY G5Z-2A-E

DCPROT

AC PRESENT

TRIGGER

REMOTE

0V_D

0V_LS_R

Top-

Bot-

CAMCON_G

FFC 14W 2.54MM VER

8K7014

DRAWING TITLE

A85 amplifier and PSU - top sheet

Circuit Diagram

2 3 4 2 5

Notes:

02_E062

02_E035

JBR

20/3/02

LDO REG FITTED TO IC201

FUSE VALUES UPRATED TO T4A

4.1

A & R Cambridge Ltd.

Pembroke Avenue

Denny Industrial Centre

Waterbeach

4/2/2002

4.0

ECO No. INITIALS

Date Printed

DATE

DESCRIPTION OF CHANGE

ISSUE

Drawn by:

Filename

L882C1_4.1.PRJ

Sheet 1 of 4

Cambridge CB5 9PB

L882C1

DRAWING NO.

J Reckless

20-Mar-2002

NEUTRAL

SK204

TP203

HS200

TO220HS08REG

TX200

9VRMS

IC201

L4940V5

+5V_D

SK203

IEC3 NO RIVETS

MOLEXPWR8

RLY200A

F202

TP204

D202

Vin

Vout

+5V(D)

TP205

D200

1N4003F

T750mA SM

1N4003F

DPDT5V

LIVE

SW200B

VOL SEL SLIDE

VR200

VDR 115V

C207

C225

100N CD

C226

100N CD

F200

T4A

TP202

TP201

C228

1000u 10V

3N3 MAINS

C224

100N CD

SH200

EMCMAINS

2 115V

C227

C205

EMC Shield

3N3 MAINS

3300u 25V

C206

3N3 MAINS

NEUTRAL

LIVE

SW200A

VOL SEL SLIDE

RLY200B

D201

1N4003F

D203

1N4003F

TP200

NEUTRAL

TP206

LIVE

VR201

VDR 115V

DPDT5V

C208

0V_D

SK202

CAGECLAMP1

BC200

TOOLING4.1

F201

T4A

TP207

TP210

3N3 MAINS

4 115V

TX 3VA 9301

EARTH

C234

0V_D

MAINS WIRING AND AUXILIARY SUPPLY

220N X2 CLASS

R231

1M5 VR25

+5V_D

9VRMS

R219

1K8 SM

IC202E

R220

TR204

BC849B

AC_PRES

10R SM

+49V

74HC14D

R211

10K SM

TP208

VPOS

D206

BAS16W SM

C229

22U EL

BR200

BRGBU8D

SK205

C209

10,000u 63V

C211

100N PC

SK200

0V_PSU

C210

10,000u 63V

0V_PSU

0V_D

MICROPROCESSOR SIGNALS INTERFACE

AMPCT6

C212

100N PC

+5V_D

TP209

MOLEXPWR6

VNEG

POWER AMP SUPPLY

TH200

PTH90DEG

C201

C202

IC202G

74HC14D

IC202F

100N SM 100N SM

R221

-49V

THPROT_uC

10R SM

R205

1K0 SM

74HC14D

CARRIER FILTER AND DEMODULATOR

+5V_D

R209

10K SM

R223

10K SM

0V_D

TRG IN

IC200A

R226

R228

SK201A

+5V_D

IC200C

LM393A SM

C233

10U EL

470R SM

100K SM

TP211

Near to PCB

C232

LM393A SM

DZ204

4V7 350MW SM

100N SM

R227

1K0 SM

L200

27mH

R224

1K8 SM

IC202A

C200

680P PP

R229

100K SM

TR205

BC856B

JACK3.5X2

R201

R213

VIPROT_L

C203

100N SM

MODULATED RC5

REMOTE CONTROL INPUT

1K0 SM

4K7 SM

C214

10N SM

74HC14D

IC202B

VIPROT_uC

C230

10N SM

R230

1K5 SM

R202

R214

R208

10K SM

R206

1K0 SM

VIPROT_R

IC200B

C218

10N SM

1K0 SM

4K7 SM

C215

10N SM

C219

10N SM

74HC14D

RC5 IN

R222

10K SM

C231

1N0 SM

LM393A SM

R225

1K8 SM

0V_D

+5V_D

0V_TRIG

+49V

IC202C

TR206

BC856B

R203

R215

DCPROT_L

DCPROT_R

C204

100N SM

R218

10K SM

1K0 SM

4K7 SM

C216

10N SM

+5V_D

74HC14D

TR200

BD179

IC202D

DCPROT_uC

RLY200C

DPDT5V

R204

R216

D205

BAS16W SM

TR201

FMMT497

R207

1K0 SM

C223

10U EL

C213

10N SM

DZ207

15V 350MW SM

C220

100N SM

1K0 SM

4K7 SM

C217

10N SM

C221

10N SM

74HC14D

TRIGGER OUTPUT

APPROX 13.5VDC

60mA MAX CURRENT

R217

10R SM

TP212

R200

1K0 SM

SK201B

TR202

FMMT597

STANDBY RELAY CONTROL

R210

10K SM

0V_D

C222

Far from PCB

10U EL

JACK3.5X2

DRAWING TITLE

0V_TRIG

TR203

FMMT497

R212

A85 amplifier - power supply and microcontroller interface

0V_TRIG

PWRON

CAMCON_G

SK101C

4K7 SM

C235

Circuit Diagram

CHASS

3 4 2

Notes:

02_E062

02_E035

JBR

20/3/02

LDO REG FITTED TO IC201

4.1

0V_D

1N0 SM

A & R Cambridge Ltd.

Pembroke Avenue

Denny Industrial Centre

Waterbeach

4/2/2002

FUSE VALUES UPRATED TO T4A

4.0

ECO No. INITIALS

Date Printed

DATE

DESCRIPTION OF CHANGE

ISSUE

Drawn by:

J Reckless

Filename

L882C2_4.1.SCH

Sheet 2 of 4

Cambridge CB5 9PB

L882C2

DRAWING NO.

20-Mar-2002

VPOS

R319

100R SM

R315

100R SM

R316

100R SM

R300

10K SM

PRE DRIVER

PNP CURRENT MIRROR

TR310

FMMT497

TR300

FMMT597

TR301

FMMT597

R301

10K SM

R321

22R SM

TR302

FMMT597

C300

100U EL

DZ300

15V 350MW SM

TR309

FMMT497

TR321

FMMT597

OUTPUT STAGE

V-I PROTECTION

VI PROTECT

R338

150R SM

R329

4K7 SM

R305

10K SM

SIGNAL TO MICRO

D301

BAS16W SM

C307

TP307

R333

0V_HF

TR318

SAP15N

R334

22K SM

VIPROT

3K3 SM

100P SM

DZ305

4V7 350MW SM

TR311

FMMT497 C317

R306

10K SM

C305

10U EL

TP305

R341

D303

1N4003F

TR312

FMMT497

TR313

FMMT497

DC SERVO

R347

R349

BOOTSTRAP

330R SM

100R SM

R345

100R SM 0R0 SM

100R SM

470N PE

IC300B

R325

1K0 SM

R343

C302

100U EL 100V

C310

100N SM

R330

ADJ BIAS

RV300

0V_HF

1M0 SM

PL300

C303

100U EL

0V_SIG

R340

100K SM

R328

4K7 SM

TL072CD

0V_SIG

100R PSET

R351

R352

470R 2W MF 5%

10R MF

D300

BAS16W SM

MEASURE

BIAS

TP302

R331

INPUT FILTER

V TO I AMP

1K5 SM

0V_SIG

L300

2U2H LAC SMALL

(SET TO 16mV)

R324

IC300A

INPUT

TP304

R322

OUTPUT

R332

1K0 SM

470R 2W MF 5%

R353

DZ302

DC OFFSET SIGNAL

TO MICRO

1K8 SM

4V7 350MW SM

TL072CD

R327

22K SM

22R SM

R350

5R6 2W CF

R355

6K8 SM

DCPROT

R303

10K SM

TR322

FMMT497

C318

C304

DZ303

C316

470P PPW

C312

10N SM

ZOBEL NETWORK

C313

10U EL

100U EL

4V7 350MW SM

R337

22R SM

TR305

FMMT597

C311

100N PC

C319

100N PE

DC OFFSET

DETECTION

R326

1K0 SM

R344

R346

100R SM 0R0 SM

R304

10K SM

0V_SIG

C306

TP303

TR303

R354

1K0 SM

C309

100N SM

0V_SIG

TR304

FMMT597

100U EL 100V

0V_LS

R348

100R SM

D304

1N4003F

0V_SIG

R308

22K SM

TP306

R342

330R SM

BOOTSTRAP

R302

10K SM

100N SM

0V_HF

FMMT597

R307

10K SM

0V_HF

0V_LS

TP308

C308

R336

22K SM

R335

3K3 SM

C314

100N SM

D302

BAS16W SM

TR319

SAP15P

TR316

FMMT497

100P SM

R339

150R SM

R310

4K7 SM

R313

DZ306

4V7 350MW SM

C320

100U NP

0V_SIG

TR320

FMMT497

R314

10K SM

DZ301

15V 350MW SM

OUTPUT STAGE

10K SM

V-I PROTECTION

C315

100N SM

0V_HF

TR306

FMMT597

R323

22R SM

C301

100U EL

0V_HF

TR314

FMMT497

TR315

FMMT497

R309

10K SM

TR307

FMMT597

TR308

FMMT597

NPN CURRENT MIRROR

PRE DRIVER

R317

100R SM

R318

100R SM

R311

10K SM

TR317

FMMT497

R320

100R SM

R312

10K SM

VNEG

DRAWING TITLE

A85 amplifier - power output stage left

Circuit Diagram

3 4 2

Notes:

02_E062

02_E035

JBR

20/3/02

LDO REG FITTED TO IC201

4.1

A & R Cambridge Ltd.

Pembroke Avenue

Denny Industrial Centre

Waterbeach

4/2/2002

FUSE VALUES UPRATED TO T4A

4.0

ECO No. INITIALS

Date Printed

DATE

DESCRIPTION OF CHANGE

ISSUE

Drawn by:

J Reckless

Filename

L882C3_4.1.SCH

Sheet 3 of 4

Cambridge CB5 9PB

L882C3

DRAWING NO.

20-Mar-2002

VPOS

R419

100R SM

R415

100R SM

R416

100R SM

R400

10K SM

PRE DRIVER

PNP CURRENT MIRROR

TR410

FMMT497

TR400

FMMT597

TR401

FMMT597

R401

10K SM

R421

22R SM

TR402

FMMT597

C400

100U EL

DZ400

15V 350MW SM

TR409

FMMT497

TR421

FMMT597

OUTPUT STAGE

V-I PROTECTION

VI PROTECT

R438

150R SM

R429

4K7 SM

R405

10K SM

SIGNAL TO MICRO

D401

BAS16W SM

C407

TP407

R433

0V_HF

TR418

SAP15N

R434

22K SM

VIPROT

3K3 SM

100P SM

DZ405

4V7 350MW SM

TR411

FMMT497 C417

R406

10K SM

C405

10U EL

TP405

R441

D403

1N4003F

TR412

FMMT497

TR413

FMMT497

DC SERVO

R447

R449

BOOTSTRAP

330R SM

100R SM

R445

100R SM 0R0 SM

100R SM

470N PE

IC400B

R425

1K0 SM

R443

C402

100U EL 100V

C410

100N SM

R430

ADJ BIAS

RV400

0V_HF

1M0 SM

PL400

C403

100U EL

0V_SIG

R440

100K SM

R428

4K7 SM

TL072CD

0V_SIG

100R PSET

R451

R452

470R 2W MF 5%

10R MF

D400

BAS16W SM

MEASURE

BIAS

TP402

R431

INPUT FILTER

V TO I AMP

1K5 SM

0V_SIG

L400

(SET TO 16 mV)

R424

IC400A

INPUT

TP404

R422

OUTPUT

R432

1K0 SM

2U2H LAC SMALL

DC OFFSET SIGNAL

TO MICRO

470R 2W MF 5%

R453

1K8 SM

TL072CD

DZ402

R427

22K SM

22R SM

R450

5R6 2W CF

4V7 350MW SM

R455

6K8 SM

DCPROT

R403

10K SM

ZOBEL NETWORK

TR422

FMMT497

C418

C404

DZ403

C412

10N SM

10U EL

100U EL

4V7 350MW SM

C416

470P PPW

R437

22R SM

TR405

FMMT597

C411

100N PC

C419

100N PE

DC OFFSET

DETECTION

R426

1K0 SM

R444

R446

100R SM 0R0 SM

R404

10K SM

0V_SIG

C413

TP403

TR403

R454

1K0 SM

C409

100N SM

0V_SIG

TR404

FMMT597

C406

0V_LS

R448

100R SM

D404

1N4003F

0V_SIG

R408

22K SM

100U EL 100V

TP406

R442

330R SM

R402

10K SM

100N SM

BOOTSTRAP

0V_HF

FMMT597

R407

10K SM

0V_HF

0V_LS

C408

R436

22K SM

TP408

R435

3K3 SM

C414

100N SM

D402

BAS16W SM

TR419

SAP15P

TR416

FMMT497

100P SM

R439

150R SM

R410

4K7 SM

R413

DZ406

4V7 350MW SM

C420

100U NP

0V_SIG

TR420

FMMT497

R414

10K SM

DZ401

15V 350MW SM

OUTPUT STAGE

10K SM

V-I PROTECTION

C415

100N SM

0V_HF

TR406

FMMT597

R423

22R SM

C401

100U EL

0V_HF

TR414

FMMT497

TR415

FMMT497

R409

10K SM

TR407

FMMT597

TR408

FMMT597

NPN CURRENT MIRROR

PRE DRIVER

R417

100R SM

R418

100R SM

R411

10K SM

TR417

FMMT497

R420

100R SM

R412

10K SM

VNEG

DRAWING TITLE

A85 amplifier - power output stage right

Circuit Diagram

3 4 2

Notes:

02_E062

02_E035

JBR

20/3/02

LDO REG FITTED TO IC201

4.1

A & R Cambridge Ltd.

Pembroke Avenue

Denny Industrial Centre

Waterbeach

4/2/2002

FUSE VALUES UPRATED TO T4A

4.0

ECO No. INITIALS

Date Printed

DATE

DESCRIPTION OF CHANGE

ISSUE

Drawn by:

J Reckless

Filename

L882C4_4.1.SCH

Sheet 4 of 4

Cambridge CB5 9PB

L882C4

DRAWING NO.

20-Mar-2002

Display

Board

L928

Contents

ꢀ

Component overlay

Parts list

ꢀ

Circuit diagrams

CAM Products 2000(TM): L928PB_B.GTO

L928 Display Board Parts List Issue B.3

Designator Part

Description

2C018

2C410

MLC 18P 50V X7R 10% SM

MLC 100N 50V X7R 10% SM

ELST 10U 50V SM

2C410

2M610

C10

C11

C12

C13

C14

C15

C16

C17

C25

C26

C28

C29

C31

C32

C33

C34

C37

C38

C39

C40

C41

C43

C44

C45

C46

C47

C48

C49

C50

C51

C52

C53

C54

C55

C60

C61

C62

C63

2C410

2M610

2C410

2M610

2M710

2C010A

2N722

2C210

MLC 100N 50V X7R 10% SM

ELST 10U 50V SM

MLC 100N 50V X7R 10% SM

ELST 10U 50V SM

ELST 100U 25V SM

MLC 10P 50V NPO 10% SM

ELST 220U 16V

MLC 1N0 50V X7R 10% SM

CAP PACK NPO 0612 4X100P 50V 5%

ZENER 33V BZX55C33V

DIODE SS SM BAS16W

DISPLAY CRADLE E916PM

MN12818A VFD ITRON

H8/3048 128K FLASH MICROCONTROLLER

IC MICRO RESET DS1233 SM

IC CMOS EPROM 24C02 SM

IC COMPARATOR SM DUAL LM393A

DUAL OUTPUT SINGLE SUPPLY AMP AD8532

LED GREEN 5MM

2C210

2W110X4

3C13304

3AS16W

E916PM

B1013

5H3048

5H1233A

5G2402

5M393AD

5M8532

3D001

DC1

DC2

DISP1

IC1

IC2

IC5

IC6

IC7

IC8

IC11

LED1

LED2

3D001

LED GREEN 5MM

L928 Display Board Parts List Issue B.3

Designator Part

Description

LED3

LED4

LED5

LED6

LED7

LED8

LED9

LED10

LED11

3D001

3D006

4A847

4B179

1A310

1A133

1A310

1A133

1A310

1A133

1A115

1A310

1A212

1A222

1A247

1A410

1A310

1A212

1A247

1A000

LED GREEN 5MM

LED RED/GREEN 3MM L-93WEGW

TRANS LF SS N SM BC847B

NPN TRANS MP BD179

RES SM W4 2% 10K

RES SM W4 2% 330R

RES SM W4 2% 10K

RES SM W4 2% 330R

RES SM W4 2% 10K

RES SM W4 2% 330R

RES SM W4 2% 150R

RES SM W4 2% 10K

RES SM W4 2% 1K2

RES SM W4 2% 2K2

RES SM W4 2% 4K7

RES SM W4 2% 100K

RES SM W4 2% 10K

RES SM W4 2% 1K2

RES SM W4 2% 4K7

RES SM W4 2% 0R0

R10

R11

R12

R13

R14

R15

R16

R17

R18

R19

R20

R21

R22

R23

R24

R25

R26

R27

R28

R29

R30

R31

R32

R33

R34

R35

R36

R37

R38

R39

R40

R41

R42

R43

R44

R45

R46

R47

R48

L928 Display Board Parts List Issue B.3

Designator Part

Description

R49

R50

R51

R52

R53

R54

R55

R56

R57

R58

R59

R64

R65

R66

R67

R68

R69

R70

R71

R72

R73

R74

R75

R76

RX1

SK1

SK2

SK3

SK4

SP1

SP2

SP3

SP4

SP5

SP6

SP7

SP8

SP9

SP10

SP101

SP102

SP103

SW1

SW2

SW3

SW4

SW5

SW6

SW7

SW8

SW9

SW10

SW11

SW12

SW13

SW14

SW15

SW16

SW17

SW18

1A310

1A110

1H233

1A310

1A000

1A110

1A310

1A822

1A310

B2107

8K7014A

8K2005

8K8022A

8K6315

F195

RES SM W4 2% 10K

RES SM W4 1% 100R 1206

RES MF W4 1% 3K3

RES SM W4 2% 10K

RES SM W4 2% 0R0

RES SM W4 1% 100R 1206

RES SM W4 2% 10K

RES SM W4 1% 2R2 1206

RES SM W4 2% 10K

REMOTE RX PIC-26043TM2 38KHZ

FFC 14W 2.54MM HOR PTH

5-WAY AMP CT CONN

22-WAY FFC CONN HORIZ 1MM PTH

14 WAY DIL HEADER HORIZ

LED SPACER

F195

F163

LED SPACER

STICKY PAD S/A 10 X 15mm

IR RX SUPPORT PAD

E822AP

A1505

A1211

7X040

IR RX SUPPORT PAD

TACT SWITCH SM SDTM-610-NTR

EC16B2414

XTAL 16MHZ SM GSX49-4

A32 FMJ DISPLAY PCB

L928CT_B.1

L928CT_2_B.3.SCH

MICRO

FD_1

FD_2

FIDUCIAL FIDUCIAL

FIX7

FIX2

FIX10

FIX5

FIX6

FIX13

FIXING HOLE 3F.I5XING HOLE 3F.I5XING HOLE 3.5

C39

1N0 SM

CHASSIS 1

(BY SK3)

C38

1N0 SM

C40

1N0 SM

C41

1N0 SM

C43

C44

0V_D

1N0 SM

0V_D

FIX1

FIX8

FIX9

FIX3

FIX11

FIX12

FIXING HOLE 3F.I5XING HOLE 3F.I5XING HOLE 3F.I2XING HOLE 3.5

FIXING HOLE 3.5 FIXING HOLE 3.2

C45

1N0 SM

C46

1N0 SM

C47

1N0 SM

CHASSIS 2

(BY SK1)

C37

1N0 SM

C48

1N0 SM

C49

1N0 SM

0V_D

CHASSIS 3

(BY SK2)

0V_D

PCB1

PCB

L928PB_B

DRAWING TITLE

A32 FMJ AMP DISPLAY PCB

WAF

26/9/01

10/9/01

9/08/01

STICKY PADS RENUMBERED

PRE PRODUCTION RELEASE

UPDATED PROTOTYPE

INITIAL PROTOTYPE

B.3

B.2

JBR

WAF

Circuit Diagram

2 3 4 2 5

Notes:

B.0

A & R Cambridge Ltd.

Pembroke Avenue

Denny Industrial Centre

Waterbeach

25/04/01

A.0

ECO No. INITIALS

Date Printed

DATE

DESCRIPTION OF CHANGE

ISSUE

Drawn by:

Filename

Cambridge CB5 9PB

Sheet 1 of 2

L928CT1

DRAWING NO.

_{J:\Released_Documents\Native_format_files\Protel_DDB\L928_B.3.Ddb - Documents\L928CT}1_{_1}0_{_}-_BO_.3c_.Pt-_R2_J001

SP7

SP8

SP6

SP3

SP10

SP9

SP1

SP4

SP2

SP5

SPACER F195SPACER F195SPACER F195SPACER F195SPACER F195SPACER F195SPACER F195SPACER F195SPACER F195SPACER F195

PHONO/

AUX

+5V

MODE

RECORD

TONE

DVD

DOWN

ENTER

POWER

SELECT

TUNER

VCR

TAPE

SP2

SP1

BC847B

10K SM

SW6

10K SM

SW12

10K SM

SW11

10K SM

SW8

10K SM

SW7

10K SM

SW13

10K SM

SW14

10K SM

SW15

R68

10K SM

SW17

10K SM

SW16

R10

10K SM

SW1

R11

10K SM

SW4

R12

10K SM

SW2

R13

10K SM

SW5

R14

10K SM

SW3

R15

10K SM

SW10

R16

10K SM

SW9

R17

330R SM

R18

330R SM

R19

330R SM

R20

330R SM

R21

330R SM

R22

330R SM

R25

330R SM

R24

330R SM

R23

330R SM

R31

330R SM

TACTSW A1505 TACTSW A1505 TACTSW A1505 TACTSW A1505 TACTSW A1505 TACTSW A1505 TACTSW A1505 TACTSW A1505 TACTSW A1505 TACTSW A1505TACTSW A1505 TACTSW A1505 TACTSW A1505 TACTSW A1505 TACTSW A1505 TACTSW A1505 TACTSW A1505

Q_65

LED7

Q_66

LED8

Q_67

LED6

Q_68

LED3

Q_69

Q_70

LED9

Q_71

LED1

Q_72

LED4

Q_73

LED2

Q_74

LED5

LED10

R29

10K SM

R30

10K SM

R33

330R SM

R34

150R SM

0V_D

LED GREEN

LED11

IC7B

+5V

2V7

0V5

LED RED/GRN 3MM

DISP1

B1013

F1 to F2 = 4Vac 150mA

VDD2 = 40Vdc 20mA

+5V

Q_21

R36

10K SM

Q_22

R39

2K2 SM

SP101

LM393A SM

DOUBLE SIDED

STICKY PAD

10 X 15MM

R35

0V_D

+5V

Graphics Display

0V_D

R74

10K SM

LEFTAUDIO

10K SM

STICKY PAD DS 10X15MM

SP102

10U EL SM

C11

R40

4K7 SM

R47

4K7 SM

IC6B

IC8A

+5V

0V_D

R73

DOUBLE SIDED

STICKY PAD

10 X 15MM

Q_59

2V7

+5V

IRIN

R50

TRANSMIT

RECEIVE

SAMHOLD

SAMTX2

10K SM

IRIN

2V7

SAMDATA

10K SM

Q_34

R43

100K SM

+5V

SAMBUSY

STICKY PAD DS 10X15MM

BC847B

Q_35

DC1

R41

100K SM

+5V

LM393A SM

R38

1K2 SM

LM393A SM

R46

1K2 SM

DISPLAY CRADLE

E916PM

+5V

VFD_VDD2

R37

10K SM

R45

10K SM

IC6A

IC8B

0V5

IC7A

LM393A SM

R76

10K SM

IROUT

BC847B

DISPLAY CRADLE E916PM

DC2

Q_115

SAMRX2

R49

10K SM

0V_D

+5V

0V_D

R75

DISPLAY CRADLE

E916PM

10K SM

Q_54

LM393A SM

Q_53

R44

Q_82

Q_49

DISPLAY CRADLE E916PM

R42

100K SM

IC11A

AD8532 SM

O/P

IR RX

SUPPORT PAD

0V_D

100K SM

100N SM

+5V

Q_47

+5V

Q_48

R58

+5V

IR RX SUPPORT PAD

RX1

R52

0V_D

F1CLOCK

Q_79

0R0 SM

Q_80

SBX1610-52/PIC-26043TM2

SP103

R56

10K SM

100R SM

100N SM

PLACE ONE ON TOP OF

THE OTHER UNDER RX1

0V_D

IR RX

Q_50

Programming adaptor

SUPPORT PAD

SW18

R59

0V_D

PR_GND

PR_TXD

SK4

ALPS_ENCODER

R53

PHASEA

PHASEB

F2CLOCK

Q_78

PR_VCC

PR_RXD

Q_58

Q_57

0R0 SM

Q_81

RECEIVE

TRANSMIT

RESPIN

IR RX SUPPORT PAD

100R SM

R57

10K SM

IC11B

AD8532 SM

Q_55

VPROG

PB0

PR_VPP

PR_PMODE

PR_MD

PR_RESET

SAMHOLD

+5V

0V_D

HEADER 7X2HORIZ

C14

C13

100N SM

0V_D

10U EL SM

+5V

0V_D

100N SM

SK2

0V_D

+5V

IC1

Q_19

C17

SAMDATA

100N SM

SAMBUSY

+5V

BAS16W SM

Q_20

R26

Q_56

0V_D

Vcc

PB0

PB1

PB2

PB3

PB4

PB5

PB6

PB7

MD2

MD1

MD0

+5V

PB0

10K SM

AMPCT5

R55

10K SM

SEL7

SEL6

SEL5

SEL4

SEL3

SEL2

SEL1

VPROG

0V_D

STANDBY

To power amp / PSU

SK1

P6.6/LWR

P6.5/HWR

P6.4/RD

P6.3/AS

Vcc

+SUP

Q_121

SP1ON

SP2ON

THERMPROT

18P SM

Q_51

Q_37

Q_38

C60D 100PX4 SM

C60C 100PX4 SM

C60B 100PX4 SM

C60A 100PX4 SM

C61D 100PX4 SM

C61C 100PX4 SM

C61B 100PX4 SM

C61A 100PX4 SM

C62D 100PX4 SM

C62C 100PX4 SM

C62B 100PX4 SM

C62A 100PX4 SM

C63D 100PX4 SM

BAS16W SM

16MHZ SM

STANDBY

SP1ON

XTAL

EXTAL

Vss

NM1

RES

STBY

Q_122

Q_123

Q_124

Q_125

Q_126

Q_127

Q_128

0V_D

18P SM

+5V

Q_52

Q_46

Vpp/RESO

Vss

SP2ON

R64

C12

100N SM

DISPDAT

DISPCLK

THERMPROT

VIPROT

DCPROT

ACPRESENT

C33

220U EL

C34

220U EL

TxD0/P9.0

TxD1/P9.1

RxD0/P9.2

RxD1/P9.3

IRQ4/SCK0/P9.4

IRQ5/SCK1/P9.5

D0/P4.0

D1/P4.1

D2/P4.2

D3/P4.3

Vss

H8/3048F

TRANSMIT

RECEIVE

RESPIN

100R SM

100N SM

CLKOUT

P6.2/BACK

P6.1/BREQ

P6.0/WAIT

Vss

P5.3/A19

P5.2/A18

P5.1/A17

P5.0/A16

P2.7/A15

P2.6/A14

R65

+5V

0V_D

SAMTX2

SAMRX2

BUT17

IC2

Vcc

Res

Q_45

IRIN

100R SM

R67

(FIT CLOSE TO SK1)

Q_129

R66

DISPBLK

DISPLAT

Q_43

C63C 100PX4 SM

C63B 100PX4 SM

C63A 100PX4 SM

100R SM

Q_39

TONEID

SDATA

BUT9

BUT8

BUT7

BUT6

BUT2

IND3

Q_86

100R SM

Gnd

Q_44

FFC 14W 2.54MM HOR

Q_87

Q_88

Q_89

Q_90

Q_91

0V_D

DS1233 SM

SLOAD

SCLK

100N SM

D4/P4.4

D5/P4.5

D6/P4.6

C31

10P SM

C32

10P SM

0V_D

CHASSIS 2

Q_42

0V_D

H8/3048F

Q_98

0V_D

+5V

R51

100R SM

BD179 NPN TO-126

To preamp board

SK3

+SUP

VFD_VDD2

C50A 100PX4 SM

C50B 100PX4 SM

C50C 100PX4 SM

C50D 100PX4 SM

C51A 100PX4 SM

C51B 100PX4 SM

C51C 100PX4 SM

C51D 100PX4 SM

C52A 100PX4 SM

C52B 100PX4 SM

C52C 100PX4 SM

C52D 100PX4 SM

C53A 100PX4 SM

C53B 100PX4 SM

C53C 100PX4 SM

C53D 100PX4 SM

C54A 100PX4 SM

C54B 100PX4 SM

C54C 100PX4 SM

C54D 100PX4 SM

C55A 100PX4 SM

C55B 100PX4 SM

C55C 100PX4 SM

C55D 100PX4 SM

Q_1

Q_2

Q_3

Q_4

Q_5

Q_6

Q_7

Q_8

Q_9

SEL1

Q_23

Q_41

+5V

SEL2

SEL3

SEL4

SEL5

SEL6

SEL7

SEL8

SEL9

Q_40

R54

3K3 MF

Q_64

100N SM

R32

10K SM

C28

10U EL SM

C29

100U EL SM

IC6C

IC7C

C16

100N SM

0V_D

IC8C

LM393A SM

IC11C

AD8532 SM

Q_75

ZENER 400MW 33V

C10

C15

100N SM

C25

100N SM

LM393A SM

100N SM

IC5

24C02 SM

Q_10 LEFTAUDIO

Q_116

C26

10U EL SM

Q_11

Q_12

Q_117

Q_14 TONEID

Q_118

Q_15

Q_119

Q_16

Q_120

Q_17

MUTE

TONE

VSS

VDD

0V_D

100N SM

0V_D

SDATA

SLOAD

SCLK

DRAWING TITLE

0V_D

A32 FMJ AMP DISPLAY PCB

WAF

JBR

WAF

26/9/01

10/9/01

9/08/01

STICKY PADS RENUMBERED

PRE PRODUCTION RELEASE

UPDATED PROTOTYPE

INITIAL PROTOTYPE

B.3

B.2

FFC 22W 1MM HOR

Circuit Diagram

2 3 4 2 5

0V_D

Notes:

B.0

CHASSIS 1

A & R Cambridge Ltd.

Pembroke Avenue

Denny Industrial Centre

Waterbeach

A.0

25/04/01

0V_D

ECO No. INITIALS

Date Printed

DATE

DESCRIPTION OF CHANGE

ISSUE

Drawn by:

Filename

Cambridge CB5 9PB

Sheet 2 of 2

L928CT2

DRAWING NO.

10-Oct-2001

J:\Released_Documents\Native_format_files\Protel_DDB\L928_B.3.Ddb - Documents\L928CT_2_B.3.SCH

Preamplifier

Board

L937

Contents

ꢀ

Circuit description

Component overlay

Parts list

ꢀ

Circuit diagrams

excursion which wastes power and may damage the drive

units.

Pre-amplifier circuit description

Refer to L937 circuit diagrams

The digital pots Z108D and Z108A control the bass and

treble respectively. This is done by moving the wiper

connected to the frequency-sensitive impedance between the

non-inverting and inverting terminals of Z112A, effectively

changing the ratio of feedback boost and feed-forward

attenuation of the circuit at the desired frequencies, thus

providing a EQ gain control that is symmetrical on a

logarithmic scale, with the use of a linear pot.

The A32 preamplifier is a high-performance, DC coupled

design with microprocessor control of input select, two

independent tape loops, electronic volume control, tone

bypass and electronic tone control.

It features a discrete power supply and low-noise linear

circuitry to obtain very good distortion and noise

performance, suitable for high quality source material such

as CD or DVD-A.

Z112B provides the 6dB of gain necessary to bring the

nominal signal level back to unity. C116 and C117 remove

the 2.5VDC offset from the output, to prevent clunks when

the tone controls are activated.

Input switching

Each of the inputs has a pair of diodes to the ±15V rails to

prevent static spikes from causing damage to the CMOS

Z108 is controlled by a simple 3-wire serial interface from

the microprocessor. Each of the digital lines has its own

ground return to minimise electromagnetic interference.

They are connected together only at the GND pin of the IC.

multiplexers. In addition, there is

simple resistor-

capacitor filter with a corner frequency of approximately

340kHz to remove any unwanted high frequency

interference from the signal. This uses high-quality

polypropylene capacitors for best performance.

Volume control

Z107 is a VSDVC electronic volume control IC. It works, in

conjunction with an external op-amp, by varying the feed-

forward and feedback resistors in an inverting gain

configuration. In this way, it can allow output signal swings

of up to 22Vpp whilst operating from a single +5VDC power

supply. Also, it allows the user the choice of external

circuitry to fine-tune the performance. The gain is controlled

from the microprocessor via a 3-wire serial interface. The

analogue supply rail is derived from the local +5V via R185

and C156 // C157.

Z104 and Z105 are the main input select multiplexers,

which are configured in a ‘virtual earth’ unity gain

arrangement with Z115 and Z116. This arrangement is

slightly lower distortion than the ‘normal’ one, at the cost

slightly higher noise floor. It is an inverting

configuration, which is restored to correct polarity by the

inverting electronic volume control which follows.

Z115B and Z116B are integrating servos, which take out

any DC from the input signal before the following stages.

The servos are 2-pole, with a passive 2 ^ndpole being

formed by R180 and C147 (for the left channel) to remove

broadband noise from the output of the servo and improve

speed of response.

Z117 is the output op-amp. Its outputs are decoupled via

R186, R187, C158 and C159 so that it has a low output

impedance but can drive cable capacitance without

oscillation. R186 and R187 are included in the audio

frequency feedback loop to reduce output impedance when

driving ‘difficult’ cables.

Z100 thru Z103 are the input selectors for the 2 tape loops.

These are normal non-inverting selectors which are

buffered before being passed on to the phono sockets.

RLY100 is a mute relay which shunts the preamp output to

ground. This is to prevent thumps and squeals when the units

is powered up or down.

Z109A output is decoupled by R108 which is included in

the feedback path. Local high frequency feedback occurs

around C108 to allow the tape loop output to be very low

impedance, whilst being stable into a capacitive load such

as may be presented by a screened interconnect cable. This

is the same for all tape outputs.

Power supply

The transformer winding is connected to SK300. The voltage

is rectified and smoothed by D300, D301, D306, D307 and

C300, C310. The unregulated voltage should be around

±27VDC. F300 and F301 are secondary fuses, as the low

power preamp winding would not blow the primary fuses if

short circuited.

Z106 is configured as a double pole changeover switch,

used to select the tone controls. The tone controls are

bypassed when not required so that the noise and distortion

can be minimised.

The voltage regulators are discrete compound emitter

followers. I will describe the +15V supply as the negative is

essentially an exact mirror image.

Tone control circuit

The tone control circuit is a non-inverting one, using a

gyrated ‘bell’ filter for the bass and a simple shelving filter

for the treble.

Q300 and R300 act as a constant current source, supplying

around 7mA into D310. C302 and C314 reduce ripple and

broadband noise on the zener diode. Q305 and Q306 form a

complementary Darlington NPN transistor which is

configured as an emitter follower, producing the +15VDC at

its output. C303 is to provide bulk charge storage and to

reduce the AC output impedance of the power supply. D302

prevents reverse bias of the supply during

Left channel description

The input is attenuated by 6dB and biased to a voltage of

+2.5V DC by C111, R113, R112, R110, R111 and C110.

This is so the signals fall within the 0 - 5VDC required by

the digital potentiometer Z108.

power down.

Z111B and its associated components form an active

equivalent of a series resonant LCR circuit. This has an

impedance minimum of 5.4k˜ at around 80Hz with Q=0.7

The reason the bass is done as a band-boost filter rather

than a shelving filter is so that you can boost the ‘real’

bass without causing lots of sub-audio loudspeaker cone

Z301 is a conventional LM317 type circuit to drop the +15V

rail down to +5V for the tone and volume control circuits.

Star point SP300 explicitly connects the differently named

ground nets together at one point, to minimise hum.

L937 Preamplifier Board Parts List Issue 1.0

Designator Part

Description

C100

C101

C102

C103

C104

C105

C106

C107

C108

C109

C110

C111

C112

C113

C114

C115

C116

C117

C118

C119

C120

C121

C122

C123

C124

C125

C126

C127

C128

C129

C130

C131

C132

C133

C134

C135

C136

C137

C138

C139

C140

C141

C142

C143

C144

C145

C146

C147

C148

C149

C150

C151

C152

C153

C154

C155

C156

C157

C158

C159

C160

C161

2C210

2D147W

2C410

2C110

2N710

MLC 1N0 50V X7R 10% SM

WIMA FKP2 470P 63V CAP

MLC 100N 50V X7R 10% SM

MLC 100P 50V NPO 5% SM

ELST 100U 25V

2P610CC ELEC 10U 50V CERAFINE

2K447

2D222W

2C022

PEST 470N 63V 10%

WIMA FKP2 2N2 63V CAP

MLC 22P 50V NPO 5% SM

2P610CC ELEC 10U 50V CERAFINE

2C410

2C310

2N610

2C210

2D147W

2C410

2C110

2N710

MLC 100N 50V X7R 10% SM

MLC 10N 50V X7R 10% SM

ELST 10U 50V

MLC 1N0 50V X7R 10% SM

WIMA FKP2 470P 63V CAP

MLC 100N 50V X7R 10% SM

MLC 100P 50V NPO 5% SM

ELST 100U 25V

2P610CC ELEC 10U 50V CERAFINE

2K447

2D222W

2C022

PEST 470N 63V 10%

WIMA FKP2 2N2 63V CAP

MLC 22P 50V NPO 5% SM

2P610CC ELEC 10U 50V CERAFINE

2C210

2D147W

2C410

2K410

2C022

2K447

2C410

2N610

2C410

2N710

2C022

2C210

2D147W

MLC 1N0 50V X7R 10% SM

WIMA FKP2 470P 63V CAP

MLC 100N 50V X7R 10% SM

PEST 100N 63V 10%

MLC 22P 50V NPO 5% SM

PEST 470N 63V 10%

MLC 100N 50V X7R 10% SM

ELST 10U 50V

MLC 100N 50V X7R 10% SM

ELST 100U 25V

MLC 22P 50V NPO 5% SM

MLC 1N0 50V X7R 10% SM

WIMA FKP2 470P 63V CAP

L937 Preamplifier Board Parts List Issue 1.0

Designator Part

Description

C162

C163

C164

C165

C166

C167

C168

C169

C170

C171

C172

C173

C174

C175

C176

C177

C178

C179

C180

C181

C182

C183

C184

C185

C186

C187

C188

C189

C190

C191

C192

C193

C300

C302

C303

C304

C305

C306

C307

C308

C309

C310

C312

C313

C314

C315

D100

D101

D102

D103

D104

D105

D106

D107

D108

D109

D110

D111

D112

D113

D114

D115

2D147W

2C210

2D147W

2K410

2C410

2N610

2K447

2N810C

2N722

2N833

WIMA FKP2 470P 63V CAP

MLC 1N0 50V X7R 10% SM

WIMA FKP2 470P 63V CAP

PEST 100N 63V 10%

MLC 100N 50V X7R 10% SM

ELST 10U 50V

PEST 470N 63V 10%

ELST 1M0 35V

ELST 220U 16V

ELST 3M3 25V

MLC 100N 50V X7R 10% SM

ELST 10U 50V

ELST 470U 25V RA

PEST 470N 63V 10%

MLC 100N 50V X7R 10% SM

ELST 1M0 35V

ELST 220U 16V

ELST 3M3 25V

PPRO 1N0 5% 63V RA

DIODE SS SM BAV99W

2C410

2N610

2N747

2K447

2C410

2N810C

2N722

2N833

2D210

3AV99W

L937 Preamplifier Board Parts List Issue 1.0

Designator Part

Description

D116

D117

D118

D119

D120

D121

D122

D300

D301

D302

D304

D305

D306

D307

D308

D310

D311

F300

F301

PCB1

Q100

Q300

Q301

Q303

Q305

Q306

Q307

R100

R101

R102

R103

R104

R105

R106

R107

R108

R109

R110

R111

R112

R113

R114

R115

R116

R117

R118

R119

R120

R121

R122

R123

R124

R125

R126

R127

R128

R129

R130

R131

R132

R133

R134

3AV99W

DIODE SS SM BAV99W

DIODE SS SM BAS16W

DIODE SS SM BAV99W

RECT S1D 1A 200V SM

DIODE SS SM BAS16W

RECT S1D 1A 200V SM

DIODE SS SM BAS16W

3AV99W

3AS16W

3AV99W

3BS1D

3AS16W

3BS1D

3AS16W

3CW315V ZENER 15V OW35 SM SOT23

C3751

FUSE R452 T750mA

L937PB_1 PRINTED CIRCUIT BOARD

4A849B

4J112

4B5248

4J112

4B1964

4A846B

4A856B

1A210

1A410

1A510

1A047

1A222

1A322

1A227

1A256

1A322

1A822

1A210

1A410

1A510

1A047

TRANS LF SS N SM BC849B

TRANS JFET N J112

TRANS AUDIO DRIVER N 2SC5248

TRANS JFET N J112

TRANS AUDIO DRIVER P 2SA1964

TRANS LF SS N SM BC846B

TRANS LF SS P SM BC856B

RES SM W4 1% 1K0 1206

RES SM W4 1% 100K 1206

RES SM W4 1% 1M0 1206

RES SM W4 1% 47R 1206

RES SM W4 1% 2K2 1206

RES SM W4 1% 22K 1206

RES SM W4 1% 2K7 1206

RES SM W4 1% 5K6 1206

RES SM W4 1% 22K 1206

RES SM W4 1% 2R2 1206

RES SM W4 1% 1K0 1206

RES SM W4 1% 100K 1206

RES SM W4 1% 1M0 1206

RES SM W4 1% 47R 1206

L937 Preamplifier Board Parts List Issue 1.0

Designator Part

Description

R135

R136

R137

R138

R139

R140

R141

R142

R143

R144

R145

R146

R147

R148

R149

R150

R151

R152

R153

R154

R155

R156

R157

R158

R159

R160

R161

R162

R163

R164

R165

R166

R167

R168

R169

R170

R171

R172

R173

R174

R175

R176

R177

R178

R179

R180

R182

R183

R184

R185

R186

R187

R188

R189

R190

R191

R192

R193

R194

R195

R196

R197

1A222

1A322

1A227

1A256

1A322

1A210

1A410

1A322

1A410

1A110

1A510

1A022

1A047

1A310

1A210

1A410

1A210

1A410

RES SM W4 1% 2K2 1206

RES SM W4 1% 22K 1206

RES SM W4 1% 2K7 1206

RES SM W4 1% 5K6 1206

RES SM W4 1% 22K 1206

RES SM W4 1% 1K0 1206

RES SM W4 1% 100K 1206

RES SM W4 1% 22K 1206

RES SM W4 1% 100K 1206

RES SM W4 1% 100R 1206

RES SM W4 1% 1M0 1206

RES SM W4 1% 22R 1206

RES SM W4 1% 47R 1206

RES SM W4 1% 10K 1206

RES SM W4 1% 1K0 1206

RES SM W4 1% 100K 1206

RES SM W4 1% 1K0 1206

RES SM W4 1% 100K 1206

L937 Preamplifier Board Parts List Issue 1.0

Designator Part

Description

R198

R199

R200

R201

R202

R203

R204

R300

R302

R303

R304

R307

RLY100

SK2

1A410

1A822

1A247

1A310

1A133

1A212

1A147

1A133

1A122

A216

8D225

8D226

8K8022B

8K8330

8K2404

8K2408

8K2304

8K6604

RES SM W4 1% 100K 1206

RES SM W4 1% 2R2 1206

RES SM W4 1% 4K7 1206

RES SM W4 1% 10K 1206

RES SM W4 1% 330R 1206

RES SM W4 1% 1K2 1206

RES SM W4 1% 470R 1206

RES SM W4 1% 330R 1206

RES SM W4 1% 220R 1206

RELAY DPDT 5V SM NEC EB2-5NU

PHONO SKT 4-WAY EMC GOLD

PHONO SKT 2-WAY EMC GOLD

Connector 1mm vertical 22way Molex 52806-2210

30-WAY FFC VERT CONN SM 1MM

4-WAY AMP CT CONN

SK3

SK4

SK5

SK6

SK100

SK101

SK102

SK103

SK300

SK301

Z100

Z101

Z102

Z103

Z104

Z105

Z106

Z107

Z108

Z109

Z110

Z111

Z112

Z113

Z114

Z115

Z116

Z117

Z301

8-WAY AMP CT CONN

MOLEX MINI FIT HCS 4 WAY

4-WAY FR LOCK CONN

5S408DY IC 8 TO 1 MUX DG408DY SO16

5S413DY IC QUAD SPST CMOS SW SO16

5AVSDVC IC AUDIO DIGITAL VOL SM

5A1844

5B072D

5B2134

5D317T

IC DS1844S-010

IC AUDIO SM DUAL TL072

IC OPAMP DUAL SM OPA2134PA

IC VREG POS LM317T

Main signal path

L937C2_1.1.SCH

Power supply

L937C3_1.1.SCH

USE EXCLUDE NF WHEN USING RUNOUT SHEET PROGRAM

DRAWING TITLE

Integrated amplifier preamp

PCB1

PCB

Circuit Diagram

2 3 4 2 5

Notes:

01_E014

01_1142

JBR

28/11/01

Fuses uprated to 2A

1.1

A & R Cambridge Ltd.

Pembroke Avenue

Denny Industrial Centre

Waterbeach

L937PB_1

14/8/01

First production release

1.0

ECO No. INITIALS

Date Printed

DATE

DESCRIPTION OF CHANGE

ISSUE

Drawn by:

JBR

Filename

Cambridge CB5 9PB

Sheet 1 of 3

L937C1

DRAWING NO.

28-Nov-2001

J:\Change_Control\ECO_AGENDA\01_E014 Fuse changes on A32 preamp\L937_1.1.ddb - Documents\Schematic\L937C1_1.0.PRJ

D100

BAV99W DUAL SM

D105

BAV99W DUAL SM

+15V

-15V

+5V

+15V

-15V

D103

BAV99W DUAL SM

Z100

Z109A

TL072 SM

AUX L

CD L

TUNER L

AV L

R110

2K2 SM

V+

SK2A

+15V

CDL1

R100

CDL

SK4B

Z111A

TL072 SM

CD INPUT

CD L

0V_SIG

Z112_3

R108

TAPEO1

Z112A

TAPE OUTPUT

1K0 SM

Z111_3

R112

22K SM

C104

100N SM

Z112B

DVD L

R106

1M0 SM

Z111_1

TL072 SM

47R SM

C108

100P SM

R114

C101

470P FKP2

R103

100K SM

TL072 SM

Z112_1

C117

VCR IN L

MODULE L

+5V

22K SM

Z112_7

Z106_14

C105

100N SM

0V_SIG

R111

2K2 SM

R113

22K SM

C110

100U EL

CDR1

C100

1N0 SM

0V_SIG

TAP0

TAP1

TAP2

+5V

Z108D

Z108A

C120

10U EL

C118

100N SM

0V_SIG

CDR

0V_SIG

TAPE02

C115

10U CERAFINE

-15V

TAPE 0

TAPE 1

TAPE 2

Z108E

PHONO4G

+15V

R119

R101

0V_SIG

CD R

PHONO4G

C111

22K SM

22P SM

R118

1K0 SM

Z108_19

10U CERAFINE

0V_SIG

SCLK 13

SDATA 12

SCLK

SDATA

TONEID

CLK

DIN

RST DOUT

R/W

C102

470P FKP2

-15V R104

100K SM

22K SM

GND

V-

R120

22K SM

R121

22K SM

TONEID

C113

C114

CFKP2 63V 2N2

D101

BAV99W DUAL SM

470N PE

0V_SIG

DG408DY

R204

10K SM

+15V

Z111_7

IC DS1844

-15V

+15V

-15V

D104

BAV99W DUAL SM

0V_SIG

-15V

Z101

R115

2K7 SM

R117

5K6 SM

C116

Z109B

TL072 SM

Z111B

TL072 SM

AUX R

CD R

TUNER R

AV R

10U CERAFINE

C106

100N SM

V+

R122

D102

BAV99W DUAL SM

+15V

SK2B

R109

Z115_1B

2R2 SM

0V_TONEID

C119

10N SM

C112

C107

100N SM

DVD R

R107

1M0 SM

0V_SIG

47R SM

C109

100P SM

R124

0V_SIG

-15V

VCR IN R

470N PE

C192

TUNL1

TUNL

TUNER L

R102

MODULE R

R116

2K7 SM

TUNER INPUT

2R2 SM

+5V

1K0 SM

0V_SIG

+5V

0V_SDATA

C103

470P FKP2

R105

100K SM

TAPE 0

TAPE 1

TAPE 2

470N PE

+5V

0V_SIG

TAPE0

R123

TAPE1

TAPE2

0V_SIG

R135

2K2 SM

0V_SIG

D111

2R2 SM

TUNR1

BAV99W DUAL SM

Z113A

TL072 SM

0V_SIG

TUNR

0V_SCLK

GND

V-

Z114A

TL072 SM

PHONO4G

+15V

Z113_3

R138

R125

R137

22K SM

Z114B

TL072 SM

TUNER R

0V_SIG

Z114_3

SK100

R151

Z113_1

R139

22K SM

0V_SIG

DG408DY

Z102

Z114_1

LISTEN 0

R147

1K0 SM

22K SM

C138

-15V

+15V

-15V

LISTEN 1

LISTEN 2

VCR 0

VCR 1

VCR 2

TAPE 0

TAPE 1

TAPE 2

D109

BAV99W DUAL SM

R152

22K SM

Z114_7

R144

Z106_11

22K SM

C122

-15V R128

100K SM

R136

2K2 SM

R148

Z110A

TL072 SM

C131

100U EL

22K SM

470P FKP2

AUX L

CD L

22K SM

Z108B

Z108C

R153

V+

22K SM

VCR OUTPUT

SK5B

VCRO1

C136

10U CERAFINE

R149

+15V

22K SM

D106

BAV99W DUAL SM

TUNER L

AV L

R154

R133

22K SM

R150

C132

10U CERAFINE

22K SM

0V_SIG

-15V

DVD L

R131

1M0 SM

22P SM

R143

R155

C125

100N SM

47R SM

C129

100P SM

Z108_3

22K SM

TAPE IN L

0V_SIG

D107

BAV99W DUAL SM

22K SM

+15V

MODULE L

R145

22K SM

R146

22K SM

C126

100N SM

0V_SIG

C134

470N PE

C135

+5V

Z116_1B

CFKP2 63V 2N2

0V_SIG

VCR02

MUTE*

Z113_7

0V_SIG

VCR 0

VCR 1

VCR 2

TONE*

-15V

VCR01

VCR11

VCR21

SK3A

R140

2K7 SM

R142

5K6 SM

0V_D

C137

10U CERAFINE

PHONO4G

AVL1

AVL

AV L

R126

Z113B

TL072 SM

AV INPUT

TONEID

1K0 SM

0V_TONEID

0V_SDATA

0V_SLOAD

0V_SCLK

SDATA

GND

V-

C123

R129

100K SM

C133

470P FKP2

0V_SIG

SLOAD

0V_SIG

DG408DY

AVR1

C121

1N0 SM

-15V

+15V

-15V

470N PE

C193

SCLK

D110

BAV99W DUAL SM

0V_SIG

AVR

Z103

R141

2K7 SM

Z110B

TL072 SM

AUX R

CD R

TUNER R

AV R

DVD R

TAPE IN R

FFC22V1MM

PHONO4G

V+

R127

0V_SIG

AV R

470N PE

1K0 SM

R134

SK101

C124

+15V

-15V R130

100K SM

R132

1M0 SM

0V_SIG

AUX L

47R SM

C130

100P SM

470P FKP2

AUX R

+15V

D108

BAV99W DUAL SM

MODULE R

+5V

CD L

0V_SIG

-15V

0V_SIG

C127

100N SM

0V_SIG

VCR 0

VCR 1

VCR 2

CD R

VCR0

VCR1

D112

BAV99W DUAL SM

+15V

TUNER L

TUNER R

AV L

C128

100N SM

0V_SIG

VCR2

C148

GND

V-

-15V

SK3B

DVDL1

DVDL

DVD L

R156

0V_SIG

DG408DY

22P SM

R178

DVD INPUT

-15V

+15V

AV R

1K0 SM

Z104

+15V

R170

22K SM

C140

R159

100K SM

AUX L

CD L

TUNER L

AV L

DVD L

TAPE IN L

VCR IN L

MODULE L

DVD L

R162

22K SM

V+

22K SM

470P FKP2

R171

C190

10U EL

22K SM

0V_SIG

DVD R

D122

BAV99W DUAL SM

R163

DVDR1

Z115_1A

C150

22K SM

+5V

+15V

-15V

R172

Z115A

R185

22K SM

0V_SIG

DVDR

TAPE IN L

TAPE IN R

VCR IN L

VCR IN R

R164

C191

10U EL

22K SM

0V_SIG

D121

BAV99W DUAL SM

R173

C157

22R SM

PHONO4G

+15V

R157

C154

10U EL

22K SM

C155

100N SM

DVD R

OPA2134PA SM

R165

100U EL

C156

100N SM

22K SM

1K0 SM

+15V

Z107_1

+5V

470N PE

Z115B

-15V

R183

C141

-15V R160

100K SM

0V_SIG

LFO

R180

470P FKP2

LISTEN 0

LISTEN 1

LISTEN 2

Z106

0V_SIG

1M0 SM

C143

100N SM

LIST0

LIST1

LIST2

/TONE

+15V

TONE*

16 TONE*

C158

22P SM

100K SM

SEL1 SEL2

D113

BAV99W DUAL SM

C147

100N PE

MODULE L

MODULE R

SK102

OPA2134PA SM

+15V

C144

100N SM

0V_SIG

V+

SK102_1

R186

0V_SIG

-15V

C149

Z117A

GND

V-

R188

0V_SIG

FFC30V SM

47R SM

Z107_4

-15V

D114

BAV99W DUAL SM

C188

-15V

LIN

LMO

RFO

10K SM

+15V

SK4A

0V_SIG

R174

DG408DY

22P SM

R179

0V_SIG

0V_MODULE

OPA2134PA SM

10U EL

V-

-15V

+15V

+5V

0V_SIG

SK102_3

LGND

C152

100N SM

C153

100N SM

Z105

AMPCT4

TO POWER AMP I/P

C189

GND

22K SM

AUX R

CD R

TUNER R

AV R

DVD R

TAPE IN R

VCR IN R

MODULE R

0V_SIG

C159

22P SM

R166

10U EL

Z116_1A

C151

22K SM

V+

22K SM

0V_SIG

R182

R175

TAPEIL1

TAPEIL

Z107_13

R158

22K SM

TAPE INPUT

TAPE IN L

0V_SIG

R167

RIN

RMO

R187

22K SM

+15V

-15V

RLY100A

RLY100B

R176

1K0 SM

Z116A

Z117B

22K SM

0V_SIG

TONE*

R168

47R SM

RGND

22K SM

C142

470P FKP2

R161

100K SM

TONE*

R177

SEL4 SEL3

DG413DY

RLY DPDT 5V SM RLY DPDT 5V SM

22K SM

C145

100N SM

OPA2134PA SM

R169

22K SM

0V_SIG

100R SM

0V_SIG

TAPEIR1

C139

1N0 SM

+5V

470N PE

Z116B

Z107

VSDVC

R184

C146

100N SM

0V_SIG

TAPEIR

0V_SIG

+5V

R199

LISTEN 0

LISTEN 1

LISTEN 2

1M0 SM

PHONO4G

+15V

LISTEN0

LISTEN1

LISTEN2

R189

0V_SIG

TAPE IN R

100K SM

R200

C167

100N PE

-15V

1K0 SM

D120

BAS16W SM

R181

10K SM

RLY100C

RLY DPDT 5V SM

OPA2134PA SM

2R2 SM

R201

C161

-15V R192

100K SM

0V_SDATA

C187

10U EL

GND

V-

470P FKP2

0V_SIG

2R2 SM

R202

D115

BAV99W DUAL SM

0V_SIG

DG408DY

+15V

0V_SLOAD

0V_SCLK

+15V2

-15V

+15V

+5V

0V_SIG

-15V

SK103

C186

2R2 SM

+15V1

C168

100N SM

C172

100N SM

C176

100N SM

C180

100N SM

Q100

BC849B

D116

BAV99W DUAL SM

D118

BAV99W DUAL SM

AUXR1

R203

4K7 SM

+15V

-15V

AUX R

AUX L

100N SM

MUTE*

0V_SIG

Z109C

TL072 SM

Z110C

TL072 SM

Z111C

TL072 SM

Z112C

AUXL1

-15V1

TL072 SM

SK5A VCRIL1

SK6

0V_SIG

C169

100N SM

0V_SIG

VCRIL

AUXIL1

AUXL

R190

R195

VCR INPUT

VCR IN L

AUX L

AUX INPUT

C173

100N SM

C177

100N SM

C181

100N SM

1K0 SM

-15V2

C162

AMPCT8

-15V

0V_D

470P FKP2

R193

100K SM

R197

100K SM

+15V

C165

470P FKP2

0V_SIG

-15V

0V_SIG

VCRIR1

AUXIR1

C160

1N0 SM

C164

1N0 SM

C170

100N SM

C174

100N SM

C178

100N SM

C182

100N SM

C184

DRAWING TITLE

Integrated amplifier preamp - main signal path

100N SM

0V_SIG

VCRIR

0V_SIG

AUXR

AUX R

0V_HF

PHONO4G

+15V

PHONO2G

+15V

R191

R196

0V_SIG

VCR IN R

0V_SIG

Z113C

TL072 SM

Z114C

TL072 SM

Z115C

Z116C

Z117C

1K0 SM

Circuit Diagram

3 4 2

C163

C166

470P FKP2

-15V R194

100K SM

-15V R198

100K SM

0V_SIG

Notes:

470P FKP2

01_E014

01_1142

ECO No. INITIALS

^{Date Printed}28-Nov-2001

JBR

28/11/01

14/8/01

DATE

Fuses uprated to 2A

First production release

DESCRIPTION OF CHANGE

1.1

1.0

A & R Cambridge Ltd.

Pembroke Avenue

Denny Industrial Centre

Waterbeach

C171

100N SM

C175

100N SM

C179

100N SM

C183

100N SM

C185

JBR

D117

BAV99W DUAL SM

D119

BAV99W DUAL SM

100N SM

ISSUE

0V_SIG

-15V

Drawn by:

Filename

Cambridge CB5 9PB

Sheet 2 of 3

DRAWING NO. L937C2

_{J:\Change_Control\ECO_AGENDA\01_E014 Fuse changes on A32 preamp\L937_1.1.ddb - Documents\Schematic\L937C2_1.0.S}J_CB_HR

D302

D304

BAS16W SM

Q305

BAS16W SM

LM317T

Z301

+15V

+15V3

+5V

2SA1964

Vin

Vout

Q306

SK300

MOLEXPWR4

BC846B

D305

BAS16W SM

UR+

R303

470R SM

D300

S1D

D301

S1D

Q300

J112

C300

1000u 35V

+3.75V

C304

100N SM

F300

AC1

R300

330R SM

R302

1K2 SM

C306

470U EL 25V

D310+

C303

3300u 25V

C305

10U EL

T2A SM

C307

470N PE

C308

100N SM

D310

15V 350MW SM

R307

220R SM

C314

1N0 PP

C302

220U EL

+15V SK301

C312

C309

100N SM

C315

1N0 PP

220U EL

D311

15V 350MW SM

F301

AC2

0V_PSU

-15V

0V_PSU

C313

3300u 25V

T2A SM

IDC4S

Q303

J112

D311-

0V_MODULE

D306

S1D

D307

S1D

C310

1000u 35V

R304

330R SM

SP300

0V_PSU

0V_SIG

STAR POINT 4

Q307

BC856B

UR-

-15V3

0V_HF

0V_MODULE

-15V

Q301

2SC5248

D308

0V_SIG

BAS16W SM

DRAWING TITLE

Integrated amplifier preamp - power supply

Circuit Diagram

2 3 4 2 5

Notes:

01_E014

01_1142

JBR

28/11/01

Fuses uprated to 2A

1.1

A & R Cambridge Ltd.

Pembroke Avenue

Denny Industrial Centre

Waterbeach

14/8/01

First production release

DESCRIPTION OF CHANGE

1.0

ECO No. INITIALS

DATE

ISSUE

Drawn by:

Date Printed

Filename

Cambridge CB5 9PB

Sheet 3 of 3

L937C3

DRAWING NO.

JBR

28-Nov-2001

J:\Change_Control\ECO_AGENDA\01_E014 Fuse changes on A32 preamp\L937_1.1.ddb - Documents\Schematic\L937C3_1.0.SCH

3^rdChannel

Board

L911

Contents

ꢀ

Component overlay

Parts list

ꢀ

Circuit diagrams

L911 3rd Channel Amplifier Board Parts List Issue 1.1

Designator Part

Description

BR100

C100

C101

C102

C103

C104

C105

C106

C107

C108

C109

C300

C301

C302

C303

C304

C305

C306

C307

C308

C309

C310

C311

C312

C313

C314

C315

C316

C317

C318

C319

C320

D100

D101

D300

D301

D302

D303

D304

DZ300

DZ301

DZ302

DZ303

DZ305

DZ306

IC100

IC300

L300

3BGBU8D

2C410

2N710

2C310

2C210

2N910A

2H410

2N710

2N710B

2N710

2N610

2N710B

2C110

2C410

2H410

2C310

2C410

2D147W

2K447

BRIDGE RECTIFIER 8A 200V

MLC 100N 50V X7R 10% SM

ELST 100U 25V

MLC 10N 50V X7R 10% SM

MLC 1N0 50V X7R 10% SM

ELST 10m 63V RA 35mm

PCRB 100N 100V 10% RA 5mm

ELST 100U 25V

ELST 100U 100V

ELST 100U 25V

ELST 10U 50V

ELST 100U 100V

MLC 100P 50V NPO 5% SM

MLC 100N 50V X7R 10% SM

PCRB 100N 100V 10% RA 5mm

MLC 10N 50V X7R 10% SM

MLC 100N 50V X7R 10% SM

PPRO W 470P 63V 5% RA

PEST 470N 63V 10%

2N610

2K410

2V710

ELST 10U 50V

PEST 100N 63V 10%

ELST NON POLAR 100UF 16V

RECTIFIER 1N4003F 1A 200V

DIODE SS SM BAS16W

RECTIFIER 1N4003F 1A 200V

ZENER 15V OW35 SM SOT23

ZENER 4V7 OW 35 SM SOT23

SURFACE MOUNT HEX SCHMITT TRIGGER

IC AUDIO SM DUAL TL072

INDUCT 2U2 12x20mm

3B4003

3AS16W

3B4003

3CW315V

3CW34V7

5J7414D

5B072D

7D002C

L911PB_1

8K6201

1A210

1A122

1A110

1A822

1A310

PCB

PL300

R100

R101

R102

R103

R104

R105

R106

R107

R300

R301

R302

R303

2WAY MOLEX VERT MALE CONNECTOR

RES SM W4 1% 1K0 1206

RES SM W4 1% 220R 1206

RES SM W4 1% 100R 1206

RES SM W4 1% 2R2 1206

RES SM W4 1% 10K 1206

1A310

L911 3rd Channel Amplifier Board Parts List Issue 1.1

Designator Part

Description

R304

R305

R306

R307

R308

R309

R310

R311

R312

R313

R314

R315

R316

R317

R318

R319

R320

R321

R322

R323

R324

R325

R326

R327

R328

R329

R330

R331

R332

R333

R334

R335

R336

R337

R338

R339

R340

R341

R342

R343

R344

R345

R346

R347

R348

R349

R350

R351

R352

R353

R354

R355

RLY100

RLY101

RV300

SK100

SK101

SK102

SK103

TH100

TR100

TR101

1A310

1A322

1A310

1A247

1A310

1A110

1A022

1A210

1A322

1A247

1A510

1A215

1A218

1A233

1A322

1A233

1A322

1A022

1A115

1A410

1A133

1A110

1A000

1A110

1C856

1J147

1A210

1A268

A213

RES SM W4 1% 10K 1206

RES SM W4 1% 22K 1206

RES SM W4 1% 10K 1206

RES SM W4 1% 4K7 1206

RES SM W4 1% 10K 1206

RES SM W4 1% 100R 1206

RES SM W4 1% 22R 1206

RES SM W4 1% 1K0 1206

RES SM W4 1% 22K 1206

RES SM W4 1% 4K7 1206

RES SM W4 1% 1M0 1206

RES SM W4 1% 1K5 1206

RES SM W4 1% 1K8 1206

RES SM W4 1% 3K3 1206

RES SM W4 1% 22K 1206

RES SM W4 1% 3K3 1206

RES SM W4 1% 22K 1206

RES SM W4 1% 22R 1206

RES SM W4 1% 150R 1206

RES SM W4 1% 100K 1206

RES SM W4 1% 330R 1206

RES SM W4 1% 100R 1206

RES SM W4 1% 0R0 1206

RES SM W4 1% 100R 1206

RES CF 2W 5R6 5%

RES 2W MF 5% 470R

RES SM W4 1% 1K0 1206

RES SM W4 1% 6K8 1206

RLY SPST 24V SPKR

PRES 100R LIN HORIZ

FFC 14W 2.54MM VER PTH

PHONO SKT 2-WAY EMC GOLD

CAMCON BINDING POST 4WAY GOLD

MOLEX MINI FIT 4 WAY

THERMISTOR SIEMENS B59008

NPN TRANS MP BD179

A213

6F110

8K7014

8D226

8D418G

8K2304

1T002

4B179

NPN TRANS MP BD179

L911 3rd Channel Amplifier Board Parts List Issue 1.1

Designator Part

Description

TR300

TR301

TR302

TR303

TR304

TR305

TR306

TR307

TR308

TR309

TR310

TR311

TR312

TR313

TR314

TR315

TR316

TR317

TR318

TR319

TR320

TR321

TR322

4AFMMT597 TRANS LF SS P SM FMMT597

4AFMMT497 TRANS LF SS N SM FMMT497

4CSAP15N TRANS POWER NPN SAP15N

4CSAP15P

TRANS POWER PNP SAP15P

4AFMMT497 TRANS LF SS N SM FMMT497

4AFMMT597 TRANS LF SS P SM FMMT597

4AFMMT497 TRANS LF SS N SM FMMT497

+5V_D

TP102

SK100

TP103

0V_D

SPKR1 ON

SPKR2 ON

THERMPROT

VIPROT1

TP104

TP105

TP106

TP107

TP108

DCPROT1

+5V_D

R107

0V_SIG

SP100

TH100

PTH90DEG

0V_D

FFC 14W 2.54MM VER

2R2 SM

C100

100N SM

C101

0V_D

IC100G

74HC14D

C102

100U EL

IC100E

PIN 1 TO THE LEFT AS YOU LOOK FROM THE FRONT

TP116

100N SM

THERMPROT

0V_LS

0V_HF

STAR POINT 8

R100

1K0 SM

74HC14D

IC100F

0V_PSU

74HC14D

0V_D

IC100A

IC100B

R101

+49V

VIPROT1

1K0 SM

C103

10N SM

74HC14D

IC100C

74HC14D

IC100D

RLY101B

RLY SPST SPKR

RLY100B

D100

1N4003F

RLY SPST SPKR

D101

R102

DCPROT1

1N4003F

1K0 SM

C104

10N SM

74HC14D

SK101

TP109

L911C2_1

L911C2_1.1.SCH

TR101

BD179

R105

TR100

BD179

SPKR1 ON

SPKR2 ON

INPUT

0V_SIG

0V_LS

0V_HF

VPOS

VNEG

VIPROT

DCPROT

OUTPUT

0V_D

RLY101A

100R SM

TP111

SK102A

SK102B

EMC

C105

TP112

RLY100A

TP113

+49V

-49V

Top+

Top-

Bot+

Bot-

R106

1N0 SM

RLY SPST SPKR

100R SM

PHONO2G

TP110

0V_SIG

R103

R104

220R SM

0V_HF

0V_LS

220R SM

0V_LS

0V_D

+49V

TP100

BR100

BRGBU8D

TP114

C106

10,000u 63V

C108

100N PC

PCB

L911PB_1

C107

10,000u 63V

0V_PSU

SK103

C109

100N PC

MOLEXPWR4

TP101

DRAWING TITLE

TP115

POWER AMP SUPPLY

AP85 third channel - top level

Circuit Diagram

23425

-49V

Notes:

01_1101

01_1018

4/6/01

DC OFFSET CHANGES

PRODUCTION ISSUE

1.1

A & R Cambridge Ltd.

Pembroke Avenue

Denny Industrial Centre

Waterbeach

30/1/01

1.0

ECO No. INITIALS

Date Printed

DATE

DESCRIPTION OF CHANGE

Sheet 1 of 2

ISSUE

Drawn by:

J Reckless

Filename

Cambridge CB5 9PB

L911C1

DRAWING NO.

4-Jun-2001

J:\ECO_wip\01_1101 A85 RANGE PCB FUSES AND DC OFFSET\L911_1.1.DDB - Documents\L911C1_1.1.PRJ

VPOS

R319

100R SM

R315

100R SM

R316

100R SM

R300

10K SM

PRE DRIVER

PNP CURRENT MIRROR

TR310

FMMT497

TR300

FMMT597

TR301

FMMT597

R301

10K SM

R321

22R SM

TR302

FMMT597

C300

100U EL

DZ300

15V 350MW SM

TR309

FMMT497

TR321

FMMT597

R338

150R SM

OUTPUT STAGE

V-I PROTECTION

R329

4K7 SM

R305

10K SM

VI PROTECT

SIGNAL TO MICRO

D301

BAS16W SM

C307

R333

TP307

0V_HF

TR318

SAP15N

R334

22K SM

VIPROT

3K3 SM

100P SM

DZ305

4V7 350MW SM

TR311

FMMT497 C317

R306

10K SM

C305

10U EL

TP305

R341

D303

1N4003F

TR312

FMMT497

TR313

FMMT497

DC SERVO

R347

R349

BOOTSTRAP

330R SM

100R SM

R345

100R SM 0R0 SM

100R SM

470N PE

R325

1K0 SM

R343

C302

100U EL 100V

C310

100N SM

R330

IC300B

ADJ BIAS

0V_HF

1M0 SM

PL300

C303

0V_SIG

RV300

100R PSET

R340

100K SM

100U EL

R328

4K7 SM

TL072CD

0V_SIG

R351

R352

470R 2W

5R6 2W CF

D300

BAS16W SM

TP302

MEASURE

BIAS

R331

INPUT FILTER

R324

V TO I AMP

1K5 SM

0V_SIG

IC300A

L300

2U2H LAC SMALL

INPUT

TP304

OUTPUT

R332

1K0 SM

DZ302

DC OFFSET SIGNAL

TO MICRO

470R 2W

R353

1K8 SM

4V7 350MW SM

TL072CD

R322

22R SM

R327

22K SM

R355

6K8 SM

R350

5R6 2W CF

DCPROT

R303

10K SM

TR322

FMMT497

C318

C304

DZ303

C316

470P PPW

C312

10N SM

ZOBEL NETWORK

10U EL

100U EL

4V7 350MW SM

R337

22R SM

TR305

FMMT597

C311

100N PC

C319

100N PE

DC OFFSET

DETECTION

R326

1K0 SM

R344

R346

100R SM 0R0 SM

R304

10K SM

0V_SIG

C313

C306

TP303

C309

100N SM

0V_SIG

R354

1K0 SM

TR304

FMMT597

100U EL 100V

0V_LS

R348

100R SM

D304

1N4003F

0V_SIG

R308

22K SM

TP306

R342

BOOTSTRAP

TR303

FMMT597

R302

10K SM

100N SM

0V_HF

R307

10K SM

330R SM

0V_HF

0V_LS

TP308

C308

R336

22K SM

R335

3K3 SM

C314

100N SM

D302

BAS16W SM

TR319

SAP15P

TR316

FMMT497

100P SM

R339

150R SM

R310

4K7 SM

R313

DZ306

4V7 350MW SM

C320

100U NP

0V_SIG

TR320

FMMT497

R314

10K SM

DZ301

15V 350MW SM

OUTPUT STAGE

10K SM

V-I PROTECTION

C315

100N SM

0V_HF

TR306

FMMT597

R323

22R SM

C301

100U EL

0V_HF

TR314

FMMT497

TR315

FMMT497

R309

10K SM

TR307

FMMT597

TR308

FMMT597

NPN CURRENT MIRROR

PRE DRIVER

R317

100R SM

R318

100R SM

R311

10K SM

TR317

FMMT497

R320

100R SM

R312

10K SM

VNEG

DRAWING TITLE

AP85 third channel - output stage

Circuit Diagram

23425

Notes:

01_1101

01_1018

4/6/01

DC OFFSET CHANGES

PRODUCTION ISSUE

1.1

A & R Cambridge Ltd.

Pembroke Avenue

Denny Industrial Centre

Waterbeach

30/1/01

1.0

ECO No. INITIALS DATE

Date Printed

4-Jun-2001

DESCRIPTION OF CHANGE

Sheet 2 of 2

ISSUE

Drawn by:

J Reckless

Filename

L911C2_1.1.SCH

Cambridge CB5 9PB

DRAWING NO. L911C2

Transformer

Specifications

Contents

ꢀ

L914TX

L915TX

Mechanical

Assembly

Contents

ꢀ

General assembly

parts list A32

General assembly

parts list P35

ꢀ

General assembly

parts list P35/3

A32 General Assembly Parts List E047rs_2

ITEM

230V

L813RC

115V

100V

SILVER

BLACK

DESCRIPTION

HANDY REMOTE 3 DIVA/DIVA SERIES CR389

TRANSF A85 100V

WHERE USED

QTY

L907TX

E045AY

E838CP

E839AY

HA4V06S

E045AYB

E838CPB

E839AYB

HA4V06B

FRONT PANEL ASSEMBLY

COVER

LARGE VOLUME KNOB

M4 x 6mm Screw

COVER TO CHASSIS

N/A

E046AY

E804HK

E804MI

REAR PANEL ASSEMBLY

HEAT SINK

MAINS INSULATOR

ON CHASSIS FLOOR UNDER POWER

SUPPLY PCB

E820CH

E822PM1

E850MC

E853MC

E860MC

E878MC

E879SL

E907MC

E912MC

E920MC

E938MC

F022

F037

F038

F062

F065

F082

F164

E83001

HA3V10A

HA3V06A

HA4A12B

HA5K70A

HA5L20B

HA6K60A

HE6V06B

HF4V09B

HJ4A00A

HJ4C00D

HL4SB

CHASSIS

FOOT

HEAT SHUNT

ON CHASSIS FLOOR

E850MC

PRE AMP REG CLAMP

DIVA A85 MODULE SLOT BLANKING PANEL

PHONO BOARD BRACKET

CONFIGURATION LABEL

KOOL PAD

TRANSISTOR CLAMP

HEATSINK CLAMP

DAMPING PLATE

FUSE HOLDER COVER

TOROID CLAMP ø90

RUBBER WASHER ø90

FUSE CLIP

ADHESIVE CABLE CLIP

TO220 SIL PAD

FIXES PHONO BOARD

CHASSIS

HEATSINK

ON E804HK

ON CHASSIS FLOOR

TOP OF TRANSFORMER

ON TOP OF TRANSFORMER

SPARE FUSE

TRANSFORMER

UNDER VOLTAGE REG

FRONT PANEL TO COVER

UNDER TRANSFORMER

HEATSHUNT

POWER, PREAMP & DISPLAY PCB’S

EARTHING SCREWS

HEATSINK SCREWS

FOAM TAPE

400mm

TRANSFORMER GASKET

M3 x 10mm SCREW

M3 x 6mm SCREW

M4 x 12mm SCREW

M5 x 70mm BOLT

M5 x 20mm HEX HEAD BOLT BLACK

M6 x 60mm BOLT

SFTP TORX SCREW NO.6x6mm BK

TORX SCREW NO.4x9mm + WASHER

M4 NUT

TRANSISTORS TO HEATSINK

TRANSFORMER

EARTHING NUT

EARTH

HEATSINK SCREWS

E878MC TO L870AY

BLANKING PLATES

M4 WAISTED NUT

M4 SHAKE PROOF WASHER

M5 WASHER BLACK

PLASTIC SNAP RIVET

SNAP RIVET BLACK PLASTIC

HL5EB

HP008

A32 General Assembly Parts List E047rs_2

ITEM

230V

L813RC

115V

100V

L907TX

L894AY

L915TX

SILVER

BLACK

DESCRIPTION

HANDY REMOTE 3 DIVA/DIVA SERIES CR389

TRANSF A85 100V

WHERE USED

QTY

L870AY

PHONO PCB

A85 POWERAMP PCB

DISPLAY TO PRE AMP CABLE ASSY

A32 TRANSFORMER

DISPLAY TO POWERAMP CABLE ASSY

POWERAMP TO HEADPHONE CABLE ASSY

PREAMP TO POWERAMP CABLE ASSY

PHONO TO PREAMP CABLE ASSY

A32 DISPLAY PCB

THROUGH REAR PANEL

L882AY

L914CA

L914TX

L915CA

L916CA

L917CA

L918CA

L928AY

L937AY

WA8511A

A32 PREAMP PCB

P35 General Assembly Parts List E078rs_2

ITEM

230V

115V

100V

SILVER

E058AY

E838CP

HA4V06S

BLACK

DESCRIPTION

FASCIA ASSEMBLY

COVER

M4 x 6mm Screw

2-WAY JUMPER SOCKET 0.1” M7571-05

CONNECTOR 14MM LINK BAR P2148

WHERE USED

FRONT OF CHASSIS

QTY

E058AYB

E838CPB

HA4V06B

COVER (SIDE) TO CHASSIS

ON L882AY (NEAR SWITCH)

FITTED TO REAR PANEL

8K004

8K006

E060AY

E804HK

E804MI

REAR PANEL ASSEMBLY

HEAT SINK

MAINS INSULATOR

CHASSIS REAR

CHASSIS FLOOR

ON CHASSIS FLOOR UNDER POWER

SUPPLY PCB

E820CH

E822PM1

E861MC

E879SL

E907MC

E912MC

E920MC

E938MC

F022

CHASSIS

FOOT

BASE OF CHASSIS

REAR PANEL

CHASSIS

HEATSINK

3^RDCHANNEL BLANKING PLATE

CONFIGURATION LABEL

KOOL PAD

TRANSISTOR CLAMP

HEATSINK CLAMP

DAMPING PLATE

FUSE HOLDER COVER

TOROID CLAMP ø90 (METAL)

RUBBER WASHER ø90

FOAM TAPE

HEATSINK

ON CHASSIS FLOOR

F037

F038

F164

TOP OF TRANSFORMER

ON TOP OF TRANSFORMER

FRONT PANEL TO COVER

400m

F200

E83001

9,5 I.D. HOLE BLANKING GROMMET

TRANSFORMER GASKET

M3 x 6mm SCREW

M4 x 12mm SCREW

M5 x 70mm BOLT

M5 x 20mm HEX HEAD BOLT BLACK

M6 x 60mm BOLT

SFTP TORX SCREW NO.6x6mm BK

TORX SCREW NO.4x9mm + WASHER

REAR PANEL (FOR LINK BAR)

UNDER TRANSFORMER

POWER & DISPLAY PCB’S

EARTHING SCREW

HEATSINK BOLTS

TRANSISTORS TO HEATSINK

TRANSFORMER

CHASSIS TO SUB PANEL

COMPONENTS TO REAR PANEL +

COVER TO REAR PANEL + REAR

PANEL TO CHASSIS

EARTHING NUT

HA3V06A

HA4A12B

HA5K70A

HA5L20B

HA6K60A

HE6V06B

HF4V09B

HJ4A00A

HJ4C00D

HL4SB

M4 NUT

M4 WAISTED NUT

EARTH

M4 SHAKE PROOF WASHER

M5 WASHER BLACK

A85 POWERAMP PCB

TRANSFORMER

DISPLAY TO POWERAMP CABLE ASSY

P35 SWITCH PCB

HL5EB

HEATSINK BOLT (AT THE FRONT)

CHASSIS FLOOR

L882AY TO L929AY

SUB PANEL

L882AY

L884TX

L915CA

L929AY

WA8511A

L884TX

L894AY

L880TX

P35/3 Channel General Assembly Parts List E079rs_2

ITEM

230V

115V

100V

SILVER

E058AY

E839CP

HA4V06S

BLACK

DESCRIPTION

FASCIA ASSEMBLY

COVER

WHERE USED

FRONT OF CHASSIS

QTY

E058AYB

E839CPB

HA4V06B

M4 x 6mm Screw

COVER (SIDE) TO CHASSIS

ON L882AY (NEAR SWITCH)

FITTED TO REAR PANEL

CHASSIS REAR

CHASSIS FLOOR

ON CHASSIS FLOOR UNDER POWER

SUPPLY PCB

8K004

8K006

E060AY

E804HK

E804MI

2-WAY JUMPER SOCKET 0.1” M7571-05

CONNECTOR 14MM LINK BAR P2148

REAR PANEL ASSEMBLY

HEAT SINK

MAINS INSULATOR

E806HK

E820CH

E822PM1

E879SL

E907MC

E909MC

E912MC

E921MC

HEAT SINK

CHASSIS

FOOT

CHASSIS FLOOR

BASE OF CHASSIS

CHASSIS

HEATSINK

HEATSINKS

HEATSINK

CONFIGURATION LABEL

KOOL PAD

3^RDCHANNEL SIL PAD

TRANSISTOR CLAMP

HEATSINK CLAMP

E938MC

DAMPING PLATE

ON CHASSIS FLOOR

F037

F038

F164

TOROID CLAMP ø90 (METAL)

RUBBER WASHER ø90

FOAM TAPE

TOP OF TRANSFORMER

ON TOP OF TRANSFORMER

FRONT PANEL TO COVER

400m

F200

E83001

9,5 I.D. HOLE BLANKING GROMMET

TRANSFORMER GASKET

M3 x 6mm SCREW

M4 x 12mm SCREW

M5 x 70mm BOLT

M5 x 20mm HEX HEAD BOLT BLACK

M6 x 60mm BOLT

SFTP TORX SCREW NO.6x6mm BK

TORX SCREW NO.4x9mm + WASHER

REAR PANEL (FOR LINK BAR)

UNDER TRANSFORMER

PCB’S

EARTHING SCREW

HEATSINK BOLTS

HA3V06A

HA4A12B

HA5K70A

HA5L20B

HA6K60A

HE6V06B

HF4V09B

TRANSISTORS TO HEATSINK

TRANSFORMER

CHASSIS TO SUB PANEL

COMPONENTS TO REAR PANEL +

COVER TO REAR PANEL + REAR

PANEL TO CHASSIS

EARTHING NUT

HJ4A00A

HJ4C00D

HL4SB

M4 NUT

M4 WAISTED NUT

M4 SHAKE PROOF WASHER

M5 WASHER BLACK

EARTH

HL5EB

HEATSINK BOLT (AT THE FRONT)

CHASSIS FLOOR

L882AY TO L929AY

L882AY

L884TX

L911AY

L915CA

L919CA

L929AY

WA8511A

L884TX

WA85Q1A

A85 POWERAMP PCB

TRANSFORMER

L880TX

3^RDCHANNEL PCB

SWITCH TO POWERAMP CABLE ASSY

SWITCH TO 3^RDCHANNEL CABLE ASSY

P35 SWITCH PCB

WFA35P 1A

SUB PANEL

ARCAM

All parts can be ordered via [email protected]

Pembroke Ave, Waterbeach, Cambridge, CB5 9PB, ENGLAND

TEL: +44(0) 1223 203 203

FAX: +44(0) 1223 863 384

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