AC ADAPTOR
AC-DN2B
MAINTENANCE MANUAL
1st Edition
Serial No. 10001 and Higher
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Table of Contents
Manual Structure
Purpose of this manual ........................................................................................ 3 (E)
Related manual .................................................................................................... 3 (E)
Contents ............................................................................................................... 3 (E)
1. Service Overview
1-1. Connectors and Cable ...........................................................................1-1 (E)
1-1-1. Recommended DC OUT Cable............................................1-1 (E)
1-1-2. Recommended Power Cords ................................................1-1 (E)
1-1-3. Connector Input/Output Signals...........................................1-2 (E)
1-2. Operating Environment .........................................................................1-2 (E)
1-3. Checking the Fan Operation..................................................................1-2 (E)
1-4. Removing the Cabinets .........................................................................1-3 (E)
1-5. Replacing the Fuse ................................................................................1-4 (E)
1-6. Replacing the Fan..................................................................................1-4 (E)
1-7. Notes on Repair Parts ............................................................................1-5 (E)
1-8. Printing of the Reference Numbers on Printed Boards .........................1-5 (E)
1-9. Optional Fixture ....................................................................................1-5 (E)
2. Electrical Alignment
2-1. Preparations ...........................................................................................2-1 (E)
2-2. Output Voltage Adjustment ..................................................................2-1 (E)
2-3. Note after Adjustment ...........................................................................2-1 (E)
3. Spare Parts
3-1. Exploded Views .......................................................................................... 3-1
3-2. Electrical Parts List ..................................................................................... 3-3
3-3. Supplied Accessory ..................................................................................... 3-4
3-4. Optional Fixture .......................................................................................... 3-4
AC-DN2B
1 (E)
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4. Diagrams and Board Layouts
Overall ....................................................................................................................4-1
MAIN ..................................................................................................................... 4-2
SUB01 ....................................................................................................................4-3
SUB02 ....................................................................................................................4-3
Frame ...................................................................................................................... 4-4
AC-DN2B
2 (E)
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Manual Structure
Purpose of this manual
This manual is the maintenance manual for AC Adaptor AC-DN2B.
This manual describes the information items on maintenance, and items that premise
the service based on the components parts such as alignment, schematic diagram,
board layout and spare parts list, assuming use of service engineers.
Related manual
Besides this maintenance manual, the following manual is available for this unit.
. Operation Manual (Supplied with this unit)
This manual is necessary for application and operation of this unit.
Part number : 3-204-884-0X
Contents
The following are summaries of the each section for understanding the manual.
Section 1 Service Overview
Describes information about connector input/output signals, recommended power
cords, and replacement of part.
Section 2 Electrical Alignment
Describes electrical adjustment.
Section 3 Spare Parts
Describes parts list, exploded view, and supplied accessories used in the unit.
Section 4 Diagrams and Board Layouts
Describes block diagram, schematic diagram and board layouts.
AC-DN2B
3 (E)
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Section 1
Service Overview
1-1. Connectors and Cable
1-1-2. Recommended Power Cords
1-1-1. Recommended DC OUT Cable
The following power cords are available separately for this
unit. See the following table to determine the proper
power code for your location.
When connecting a cable to the DC OUT connector (XLR,
4P), be sure to use the specified connector/complete cable
assemblies.
SONY POWER CORD (2.4 m) DK-2401L (Angle type)
Fig.
Power cord
Rated current
Rated voltage
Connection Connector
. XLR 4P, MALE : 1-508-369-11
1
2
3
4
5
6
DK-2401L (UC)
7 A
125 V
P/N 1-557-377-11 10 A
P/N 1-782-167-11 7 A
P/N 1-782-165-11 10 A
P/N 1-782-168-11 10 A
P/N 1-782-164-11
Connection Cable
250 V
250 V
. CORD WITH CONNECTOR : 1-790-446-11
(0.26 m, supplied with the unit)
. CCDD-X2 (2 m, option)
1
2
3
4
5
6
AC-DN2B
1-1 (E)
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1-1. Connectors and Cable
1-2. Operating Environment
1-3. Checking the Fan Operation
1-1-3. Connector Input/Output Signals
1-2. Operating Environment
AC IN
Operating Temperature : 0 dC to +40 dC
AC 100 V to 240 V, 200 W
Storage Temperature : _5 dC to +45 dC
Humidity :
No condensation
DC OUT (4P FEMALE)
1-3. Checking the Fan Operation
4
1
3
The unit is provided with a fan. It is designed to run
automatically when temperature of the heat sink inside the
equipment exceeds over 55dC. If there is any doubt that the
fan or fan motor control circuit fails, check the fan opera-
tion as follows.
2
_ EXT VIEW _
Specifications
Pin No.
Signal
1
2
3
4
GND
NC
GND for UNREG
No connection
Equipment Required
. Electric Load
Hewlett-Packard
NC
No connection
HP6051A + HP60501B
DC OUT
+16.4 to +17.0 V, 9 A MAX
1. Set the electric load to 9 A in the CC (constant current)
mode.
2. Connect the electric load as follows and make sure that
the fan starts up within ten minutes.
DC OUT (5P FEMALE)
1
2
3
4
5
_ EXT VIEW _
<Connection for 5P terminal>
To
Pin No.
Signal
Specifications
Lower cover
Electric Load
1
2
3
4
5
GND
NC
GND for DC OUT
No connection
(+)
(_)
NC
NC
DC OUT
+16.4 to +17.0 V, 9 A MAX
DC OUT (3P)
1
2
3
_ EXT VIEW _
Pin No.
Signal
Specifications
1
2
3
BATT (_) OUT
BATT (+) OUT
RID IN
GND for DC OUT
+16.5 to +16.9 V, 2.2 A MAX
SENS
AC-DN2B
1-2 (E)
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1-4. Removing the Cabinets
1-4. Removing the Cabinets
4. Remove the screw securing the earth wire and discon-
nect the harnesses from the connector (CN1) on the
main board.
1. Remove the four screws (B3 x 6) securing the BKW-
L601 and loosen the two screws (PSW3 x 8).
5. Disconnect the harness from the connectors (CN252,
CN253) on the SUB02 board.
B3 x 6
B3 x 6
BKW-L601
SUB 02 board
SMP
4 x 8
CN253
CN252
PSW3 x 8
CN1
Earth wire
Main board
6. Assemble the parts in reverse order of the disassem-
bling procedure.
2. Remove the four screws (PSW3 x 8) and remove the
upper case.
3. Remove the two screws (B3 x 6) securing the shield plate.
PSW3 x 8
PSW3 x 8
Upper case
Shield plate
B3 x 6
AC-DN2B
1-3 (E)
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1-5. Replacing the Fuse
1-6. Replacing the Fan
1-5. Replacing the Fuse
1-6. Replacing the Fan
w
The fuse is critical to safe operation. For replacement, be
Fan used in the unit is a periodic replacement part. For
replacement, be sure to use the specified part.
sure to use the specified part.
Sony P/N : 1-763-098-11
Recommended Replacement Period : Every five years
Sony P/N : ! 9-885-009-46
5 A 250 V
1. Remove the cabinets while referring to Section 1-4.
2. Remove the three spacer 1s and the one spacer 2.
1. Remove the cabinets while referring to Section 1-4.
2. Pull the fan socket out of the upper case.
Spacer 1
Spacer 1
Spacer 2
Upper case
Spacer 1
Fan socket
3. Raise the switching regulator and remove the two sol-
derings as shown in the figure. Then, replace the fuse.
Switching
regulator
Fuse
Remove the
solderings.
4. Assemble the unit in the reverse order of removal.
Spacer 1/Spacer 2 tightening torque : 4 N.m (40 kgf.cm)
AC-DN2B
1-4 (E)
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1-6. Replacing the Fan
1-7. Notes on Repair Parts
1-8. Printing of the Reference Numbers on Printed Boards
1-9. Optional Fixture
3. Remove the two screws and remove the fan.
1-7. Notes on Repair Parts
PTP3 x 8
1. Safety Related Components Warning
w
Components marked ! are critical to safe operation.
Therefore, specified parts should be used in the case of
replacement.
2. Standardization of Parts
Some repair parts supplied by Sony differ from those
used for the unit. These are because of parts common-
ality and improvement.
Parts list has the present standardized repair parts.
3. Stock of Parts
Parts marked with “o” at SP (Supply Code) column of
the spare parts list may not be stocked. Therefore, the
delivery date will be delayed.
4. Install a new fan in the reverse order of removal.
4. Harness
Harnesses with no part number are not registered as
spare parts.
Note at installation
Install the fan to the fan socket with care so that air flows
in the direction of the arrow.
In need of repair, get components shown in the list and
repair using them.
1-8. Printing of the Reference Numbers
on Printed Boards
PTP3 x 8
Only the lower two digits of the reference numbers of the
SUB01 board and SUB02 board are shown respectively on
the printed board. Note that these indications differ from
those on the schematic diagram, block diagram and
electrical parts list.
(example)
Board
Indication on the
printed board
Ref.No.
in the manual
Air flows
SUB01
SUB02
CN01
VR51
CN101
VR251
1-9. Optional Fixture
The following special driver is separately available as a
fixture to remove the screws securing the V shoe to the
unit.
Description
Sony Part No.
5-wing screwdriver DF-018 (for M3)
J-6530-180-A
AC-DN2B
1-5 (E)
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Section 2
Electrical Alignment
2-1. Preparations
2-2. Output Voltage Adjustment
Equipment Required
. Electric Load
Preparation
. Set the electric load to 9 A in the CC (constant current)
Hewlett-Packard
. DC Voltmeter
HP6051A + HP60501B
mode.
Test Points :
Adj. Point :
Pins (+), (_)/5P terminal
1VR251 (SUB02 board)
Connection
Specifications : 16.7 0.3 V
<Connection for 5P terminal>
To
Lower cover
Electric Load
(+)
(_)
To
VR251
1
DC Voltmeter
SUB02 board (B side)
2-3. Note after Adjustment
After adjustment has been completed, be sure to lock
1VR251 with paint.
AC-DN2B
2-1 (E)
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AC Adaptor
Section 3
Spare Parts
3-1. Exploded Views
B3 x 6
SMP
4 x 8
B3 x 6
a
b
c
*2
7
10
B3 x 6
*1
PSW
3 x 8
6
8
B3 x 6
8
c
*1
Precision
P 2.6 x 6
PTP2.6 x 6
a
b
P2 x 4
11
NUT4,
HEXAGON CAP
1
14
12
15
*2
2
PTP3 x 8
3
13
4
5
No.
Part No.
SP Description
No.
Part No.
SP Description
1
2
3
4
5
1-509-185-31 s CONNECTOR (RECEPTACLE) 4P
1-763-098-11 s FAN, DC (40 SQUARE)
2-378-311-01 o NUT(XLR), PLATE
11
12
13
14
15
9-885-009-71 o LENS, LED
9-885-009-72 o SOCKET, FAN
9-885-009-73 o CASE, LOWER
9-885-009-74 o CONNECTOR ASSY, BATTERY
9-885-009-75 o HARNESS ASSY, XLR
3-193-925-01 o SHOE (AC), V
3-193-926-01 o SCREW (M3X7), 5LR PLATE SMALL
6
7
3-692-186-01 s HOLDER,CABLE
7-627-553-47 s SCREW PRECISION +P2X4
3-724-723-01 s RUBBER (BATT), DROP PROTECTION
9-885-004-70 o HARNESS ASSY, INLET(WITH SW)
9-885-009-68 o CASE, UPPER
7-627-556-77 s SCREW PRECISION +P2.6X6 TYPE1
7-682-547-09 s SCREW +B3X6
8
9
10
7-684-221-00 s NUT 4, HEXAGON CAP
7-685-752-09 s SCREW +PTT3X8
9-885-009-69 o HARNESS ASSY, OUTPUT
7-685-792-09 s SCREW +PTP2.6X6
AC-DN2B
3-1
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Battery Adaptor
101
108
110
P2 x 3
107
P2 x 3
P2 x 3
109
B3 x 5
B3 x 5
111
104
103
P2.6 x 4
113
106
P2.6 x 4
114
105
PSW3 x 8
112
102
P2.6 x 4
P2.6 x 4
P2.6 x 4
No.
Part No.
SP Description
No.
Part No.
SP Description
101
102
103
104
105
A-8278-025-C s MOUNT, V ASSY
111
112
113
114
3-680-996-02 o PLATE
1-766-377-12 s CONNECTOR, BATTERY
3-606-344-01 o PLATE (ID)
3-606-345-01 o SEAL
3-680-997-02 o INSULATOR
3-680-998-02 o PLATE (+)
3-680-999-02 o PLATE (-)
3-606-346-02 o SEAL (FRONT)
7-627-553-38 s SCREW, PRECISION +P 2X3
7-627-556-38 s SCREW +P 2.6X4.0
7-682-546-09 s SCREW +B 3X5
106
107
108
109
110
3-669-596-00 s WASHER (2.3), STOPPER
3-679-648-02 o SPRING, COMPRESSION
3-679-688-02 o LEVER, RELEASE
3-679-690-02 o MOUNT, V
7-682-948-01 s SCREW +PSW 3X8
3-680-952-01 o KNOB, RELEASE LEVER
AC-DN2B
3-2
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3-2. Electrical Parts List
----------
MAIN BOARD
----------
(MAIN BOARD)
Ref.No.
or Q’ty Part No.
Ref.No.
or Q’ty Part No.
SP Description
SP Description
C1
C2
C3
C4
C5
! 9-885-009-14 s CAPACITOR 1uF/AC250
! 9-885-009-15 s CAPACITOR 0.22uF/AC250
! 9-885-009-16 s CAPACITOR 1500PF/AC250
! 9-885-009-16 s CAPACITOR 1500PF/AC250
9-885-009-17 s CAPACITOR 470PF/AC250
D52
F1
9-885-009-11 s DIODE FCH30A06
! 9-885-009-46 s FUSE 215005ME600
IC1
IC2
IC3
IC4
9-885-008-98 s IC TA78M18S
9-885-008-97 s IC IR2101
9-885-008-99 s IC MC34262D
9-885-009-00 s IC NJM431U-TE1
C6
C7
C8
C9
C10
9-885-009-18 s CAPACITOR 0.47uF/450V
9-885-009-18 s CAPACITOR 0.47uF/450V
9-885-009-19 s CAPACITOR 270uF/450V
9-885-009-20 s CAPACITOR 47uF/50V
9-885-009-21 s CAPACITOR 100uF/50V
L1
! 9-885-009-76 s COIL
9-885-009-77 s COIL
9-885-009-78 s COIL
9-885-009-79 s COIL
L2
L3
C11
C12
C13
C14
C15
9-885-009-22 s CAPACITOR 47uF/50V
9-885-009-23 s CAPACITOR 220uF/25V
9-885-009-24 s CAPACITOR 15000PF/630V
9-885-009-25 s CAPACITOR 1000PF/630V
9-885-009-25 s CAPACITOR 1000PF/630V
L51
Q1
Q2
Q3
Q4
Q5
9-885-009-01 s FET 2SK2837
9-885-009-02 s FET 2SK2842
9-885-009-02 s FET 2SK2842
9-885-009-03 s TRANSISTOR 2SA1298-TE85L
9-885-009-04 s TRANSISTOR RN2404
C17
C18
C19
C20
C21
9-885-009-26 s CAPACITOR 0.22uF/25V
9-885-009-27 s CAPACITOR 4700PF/50V
9-885-009-28 s CAPACITOR 0.1uF/50V
9-885-009-29 s CAPACITOR 0.1uF/50V
9-885-009-30 s CAPACITOR 10000PF/50V
RY1
! 9-885-009-80 s RELAY
SW51
9-885-009-47 s SWITCH OHD5R-60B
C22
C23
C24
C25
C26
9-885-009-31 s CAPACITOR 470PF/630V
9-885-009-31 s CAPACITOR 470PF/630V
9-885-009-31 s CAPACITOR 470PF/630V
9-885-009-31 s CAPACITOR 470PF/630V
9-885-009-32 s CAPACITOR 0.22uF/25V
T1
T2
! 9-885-009-44 s TRANSFORMER
9-885-009-45 s TRANSFORMER
TH51 ! 9-885-009-13 s THERMISTOR
ZD1
ZD2
9-885-009-12 s DIODE 02CZ20
9-885-009-12 s DIODE 02CZ20
C27
C28
C29
C30
C31
9-885-009-32 s CAPACITOR 0.22uF/25V
9-885-009-33 s CAPACITOR 10000PF/50V
9-885-009-34 s CAPACITOR 470PF/50V
9-885-009-35 s CAPACITOR 10000PF/50V
9-885-009-36 s CAPACITOR 4700PF/50V
C32
C33
C34
C51
C52
9-885-009-37 s CAPACITOR 10000PF/630V
9-885-009-37 s CAPACITOR 10000PF/630V
9-885-009-37 s CAPACITOR 10000PF/630V
9-885-009-38 s CAPACITOR 680uF/25V
9-885-009-38 s CAPACITOR 680uF/25V
C53
C54
C55
C56
C57
9-885-009-38 s CAPACITOR 680uF/25V
9-885-009-39 s CAPACITOR 100uF/25V
9-885-009-40 s CAPACITOR 10000PF/AC250
9-885-009-41 s CAPACITOR 470PF/630V
9-885-009-41 s CAPACITOR 470PF/630V
C58
C59
C60
9-885-009-42 s CAPACITOR 0.1uF/50V
9-885-009-43 s CAPACITOR 1uF/25V
9-885-009-43 s CAPACITOR 1uF/25V
D1
D2
D3
D4
D5
9-885-009-05 s DIODE D5SB60
9-885-009-06 s DIODE SF10L60U
9-885-009-07 s DIODE U1DL44A-TE12L
9-885-009-07 s DIODE U1DL44A-TE12L
9-885-009-08 s DIODE U1JU44-TE12L
D6
D7
D8
D9
D10
9-885-009-09 s DIODE 1SS184-TE85L
9-885-009-09 s DIODE 1SS184-TE85L
9-885-009-09 s DIODE 1SS184-TE85L
9-885-009-09 s DIODE 1SS184-TE85L
9-885-009-09 s DIODE 1SS184-TE85L
D11
D12
D13
D14
D51
9-885-009-09 s DIODE 1SS184-TE85L
9-885-009-09 s DIODE 1SS184-TE85L
9-885-009-09 s DIODE 1SS184-TE85L
9-885-009-10 s DIODE U2JC44
9-885-009-11 s DIODE FCH30A06
AC-DN2B
3-3
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-----------
SUB01 BOARD
-----------
3-3. Supplied Accessory
Ref.No.
or Q’ty Part No.
SP Description
Ref.No.
or Q’ty Part No.
SP Description
1pc
1-790-446-11 s CORD, CONNECTION (XLR TYPE 4P)
IC101
9-885-009-48 s IC MC34067P
3-4. Optional Fixture
Q101
Q102
Q103
Q104
9-885-009-49 s TRANSISTOR 2SC2712-TE85L
9-885-009-49 s TRANSISTOR 2SC2712-TE85L
9-885-009-50 s TRANSISTOR 2SA1162-TE85L
9-885-009-51 s TRANSISTOR DTC114EKA-T146
Part No.
SP Description
J-6530-180-A o SCREW DRIVER, 5-WING (FOR M3)
ZD101
9-885-009-52 s DIODE 02CZ6.8Y
-----------
SUB02 BOARD
-----------
Ref.No.
or Q’ty Part No.
SP Description
D251
D252
D253
9-885-009-62 s DIODE FCH30A06
9-885-009-63 s DIODE 1SS184-TE85L
9-885-009-64 s DIODE 1SS181-TE85L
IC251
IC252
IC253
9-885-009-53 s IC NJM2903M-TE2
9-885-009-54 s IC NJM2904M-TE2
9-885-009-55 s IC NJM431U-TE1
PC201 ! 9-885-009-56 s PHOTO COUPLER TLP621D4-GB-LF2
PC202 ! 9-885-009-56 s PHOTO COUPLER TLP621D4-GB-LF2
PC203 ! 9-885-009-56 s PHOTO COUPLER TLP621D4-GB-LF2
Q251
Q252
Q253
Q254
Q255
9-885-009-57 s FET 2SJ334
9-885-009-58 s TRANSISTOR 2SC2655 TPE6
9-885-009-59 s TRANSISTOR DTC114EKA-T146
9-885-009-60 s TRANSISTOR 2SC2712-TE85L
9-885-009-61 s TRANSISTOR 2SA1162-TE85L
Q256
9-885-009-61 s TRANSISTOR 2SA1162-TE85L
ZD251
ZD252
ZD253
9-885-009-65 s DIODE HZM5.1N B2-TL
9-885-009-66 s DIODE HZM18N B2-TL
9-885-009-65 s DIODE HZM5.1N B2-TL
-----------
SUB03 BOARD
-----------
Ref.No.
or Q’ty Part No.
SP Description
D301
9-885-009-67 s DIODE TLG223
-----
FRAME
-----
Ref.No.
or Q’ty Part No.
SP Description
HN001
9-885-009-69 o HARNESS ASSY, OUTPUT
HN002 ! 9-885-009-70 o HARNESS ASSY, INLET (WITH SW)
HN003
HN004
9-885-009-74 o CONNECTOR ASSY, BATTERY
9-885-009-75 o HARNESS ASSY, XLR
AC-DN2B
3-4
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Overall
Overall
Section 4
Diagrams and Board Layouts
AC-DN2B (SY) : S/N 10001 and Higher
!
!
!
!
!
4
1
3
2
!
!
!
MAIN
Overall
LOT NO. 085-
AC-DN2B
4-1
4-1
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MAIN
MAIN
AC-DN2B (SY) : S/N 10001 and Higher
MAIN -A SIDE-
MAIN -B SIDE-
AC-DN2B
4-2
4-2
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SUB01, SUB02
SUB01, SUB02
AC-DN2B (SY) : S/N 10001 and Higher
SUB01 -A SIDE-
SUB01 -B SIDE-
AC-DN2B (SY) : S/N 10001 and Higher
SUB02 -A SIDE-
SUB02 -B SIDE-
AC-DN2B
4-3
4-3
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Frame
Frame
AC-DN2B (SY) : S/N 10001 and Higher
1
D5
D51
!
SW1
!
L51
CN52
HN004
HN003
CN1
Q2
C22
C23
F1
2
1
+
4
3
2
1
DC OUT
NC
R37
ZD01
AC(H)IN
GND
IC2
4
1
GND
C26
1
2
3
4
8
7
6
5
S
NC
!
C1
3
R38
AC(C)IN
2
GND
HN002
CN51
Q3
R56
R55
4
3
2
1
5
4
3
2
1
DC OUT
NC
R46
R45
+
R39
C59
C60
L1
!
+
C24
C25
C51
C52
C53
C54
C34
C33
C32
R40
NC
GND
GND
D13
ZD02
S
NC
!
RY1
GND
T2
R9
4
R8
D10
D11
9
8
R10
R11
C109
D52
D251
D9
C29
R44
C30
CN252
HN001
6
7
8
C13
5
4
3
2
1
+
3
2
1
RID IN
!
T1
R108 C108
R122
R251
+
BATT(+)OUT
BATT(-)OUT
C102
R109
SENS
GND
GND
R253
C101
R110
C56
C57
R257
C107
!
C4
5
4
2
3
4
5
R254
R255
R112
R111
C28
C254
R275
ZD251
Q251
R43
R42
R258
R256
C110
R264
R277
!
C3
!
C2
R113
IC1
2
D4
PC202
(2/2)
D12
C255
R276
R260
C252
VR251
R41
10
R54
!
3
1
R51
R271
5
6
2
3
5
16 15 14 13 12 11 10
9
SW51
1
7
R289
R263
R262
IC252
(1/2)
IC252
(2/2)
D252
IC101
R52
C11
C12
Q254
IC253
C27
R278
R272
1
2
3
4
5
6
7
8
TH51
C260
7
!
C58
ZD252
PC201
(2/2)
R279
R259
R261
C251
R103
11
!
C105
1
2
3
R102
6
R106 C106
R104 R107
C103 R101
SUB01
C104
R105
9
R268
!
R269
PC203
(2/2)
FAN
R265
R266
R267
R291 C259
R270
R47
D253
R252
R286
R285
5
6
7
Q253
R292
IC251
(2/2)
R115
R114
R6
R7
D14
C113
R121
R120
D1
Q103
L2
L3
D2
R4
2
3
Q104
Q256
Q255
R293
2
5
9
1
Q252
R281
Q1
IC251
(1/2)
Q101
ZD101
R118
Q102
C112
R12
R284
R282 C261
C253
ZD253
D8
C256 R280
S
D3
R17
R119
R117 C111 C114 C115
R13
R14
C257
R287
C14
C9
D7
C8
R36
R288
C6
C7
R1
C15
3
1
2
R2
R35
R3
R16
R5
PC203
(1/2)
C5
13
R202
!
!
!
PC202
(1/2)
R21
R22
R23
R24
R25
R26
R27
R28
R29
R30
Q4
12
11
Q5
R31
IC4
IC3
R18
R19
1
2
3
4
8
7
6
5
PC201
(1/2)
R201
R32
C17
C202
C20
R20
C201
D6
10
C10
R34
C18
C16
C31
R15
C21
C19
C55
SUB02
MAIN
Frame
AC-DN2B
4-4
4-4
A
B
C
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E
F
G
H
For the U.S.A. and Canada
SAFETY CHECK-OUT
After correcting the original service problem,
perform the following safety checks before
releasing the set to the customer :
Check the metal trim, “metallized” knobs, screws,
and all other exposed metal parts for AC
leakage. Check leakage as described below.
LEAKAGE TEST
The AC leakage from any exposed metal part to
earth ground and from all exposed metal parts to
any exposed metal part having a return to
chassis, must not exceed 0.5 mA. Leakage
current can be measured by any one of three
methods.
1. A commercial leakage tester, such as the
Simpson 229 or RCA WT-540A. Follow the
manufacturers’ instructions to use these
instruments.
2. A battery-operated AC milliammeter. The
Data Precision 245 digital multimeter is
suitable for this job.
3. Measuring the voltage drop across a resistor
by means of a VOM or battery-operated AC
voltmeter. The “limit” indication is 0.75 V, so
analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa
SH-63Trd are examples of a passive VOM
that is suitable. Nearly all battery operated
digital multimeters that have a 2 V AC range
are suitable. (See Fig. A)
To Exposed Metal
Parts on Set
AC
voltmeter
(0.75V)
0.15 µF
1.5 kZ
Earth Ground
Fig A. Using an AC voltmeter to check AC leakage.
AC-DN2B
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Printed in Japan
2000. 10 16
©2000
Sony Corporation
AC-DN2B (SY) J, E
9-968-578-01 (1)
Communication System Solutions Network Company
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