GTP-602
Stereo Tuner/Preamplifier
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TABLE OF CONTENTS
WELCOME .................................................................... 2
SAFETY INFORMATION ...................................................... 4
INTRODUCTION & UNPACKING .............................................. 5
DESCRIPTION OF UNIT
FRONT PANEL DRAWING .................................................... 6
1.1 INTERFACE OVERVIEW ............................................ 6-7
REAR PANEL DRAWING ...................................................... 8
1.2 INPUTS & OUTPUTS SYSTEM CONNECTIONS .................... 8-9
REMOTE CONTROL DRAWING .............................................. 10
2.1 OVERVIEW OF THE GRC-800 ....................................... 11
2.5 DISCRETE CUSTOM CODES FOR INSTALLERS .................... 12
TROUBLESHOOTING
RESOLVING PROBLEMS .................................................... 13
TROUBLESHOOTING ....................................................... 14
SERVICE INFORMATION .................................................... 14
WARRANTY ................................................................. 15
GTP-602 SPECIFICATIONS ................................................. 16
ADCOM GTP-602 Owner’s Manual | 3
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THE FOLLOWING PRECAUTIONS AND SAFETY INSTRUCTIONS
ARE REQUIREMENTS OF UL AND CSA SAFETY REGULATIONS
Warning: To reduce the risk of fire or electric shock, do
not expose this unit to rain or moisture.
ATTENTION
POUR PREVENIR LES CHOCS ELECTRIQUES NE PAS UTILISER CETTE FICHE
POLARISEE AVEC UN PROLONGATEUR, UNE PRISE CE COURANT OU UNE
AUTRE SORTIE CE COURANT, SAUF SI LES LAMES PEUVENT ETRE INSEREES
A FOND SANS EN LAISSER AUCUNE PARTIE A DECOUVERT.
CAUTION
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
TO PREVENT ELECTRIC SHOCK DO NOT USE THIS POLARIZED PLUG WITH
AN EXTENSION CORD, RECEPTACLE OR OTHER OUTLET UNLESS THE
BLADES CAN BE FULLY INSERTED TO PREVENT BLADE EXPOSURE.
The graphic symbol of a lightning flash with an
arrow point within a triangle signifies that there
is dangerous voltage within the unit and it poses
a hazard to anyone removing the cover to gain
access to the interior of the unit. OnIy qualified
service personnel should make any such attempt.
CAUTION POWER LINES
Any outdoor antenna must be located away from all power lines.
OUTDOOR ANTENNA GROUNDING
If an outside antenna is connected to your tuner or tuner/preamplifier,
be sure the antenna system is grounded so as to provide some protection
against voltage surges and built-up static charges. Section 810 of the
National Electrical Code, ANSI/NFPA No. 701984, provides information
with respect to proper grounding of the mast and supporting structure,
grounding of the lead-in wire to an antenna discharge unit, size of
grounding conductors, location of antenna discharge unit, connection to
grounding electrodes, and requirements for the grounding electrode.
The graphic symbol of an exclamation point within
an equilateral triangle warns a user of the device
that it is necessary to refer to the instruction manual
and its warnings for proper operation of the unit.
Donotplacethisunitonanunstablecart, stand, tripod,
bracket, or table. The unit may fall, causing serious
injury to a child or adult, and serious damage to the
unit. Use only with a cart, stand, tripod, bracket, or
table recommended by the manufacturer or sold with
the unit. Any mounting of the device should follow the
manufacturer’sinstructions, andshoulduseamounting
accessory recommended by the manufacturer.
2
2
a. Use No.10 AWG (5.3 mm ) copper, No.8 AWG (8.4 mm ) aluminum, No.17
2
AWG (1.0 mm ) copper clad steel or bronze wire, or larger, as a ground
wire.
b. Secure antenna lead-in and ground wires to house with stand-off
insulators spaced from 46 feet (1.221.83 m) apart.
Read all the safety and operating instructions before connecting or using
this unit.
c. Mount antenna discharge unit as close as possible to where lead-in enters
house.
Retain this notice and the owner’s manual for future reference.
All warnings on the unit and in its operating instructions should be adhered to.
All operating and use instructions should be followed.
2
d. Use jumper wire not smaller than No.6 AWG (13.3 mm ) copper, or the
equivalent, when a separate antenna grounding electrode is used. See NEC
Section 810-21 (j).
EXAMPLE OF ANTENNA GROUNDING AS PER NATIONAL ELECTRICAL CODE
INSTRUCTIONS CONTAINED INARTICLE 810. RADIOAND TELEVISION EQUIPMENT.
Do not use this unit near water. For example, near a bathtub, washbowl,
kitchen sink, laundry tub, in a wet basement, or near a swimming pool.
power lines
The unit should be installed so that its location or position does not interfere
with its proper ventilation. For example, it should not be situated on a
bed, sofa, rug, or similar surface that may block the ventilation openings;
or placed in a built-in installation, such as bookcase or cabinet, that may
impede the flow of air through its ventilation openings.
ground clamp
service entrance
conductors
standoff
insulators, b
The unit should be situated away from heat sources such as radiators, heat
registers, stoves, or other devices (including amplifiers) that produce heat.
mast
The unit should be connected to a power supply outlet only of the voltage
and frequency marked on its rear panel.
antenna
lead-in wire
service
The power supply cord should be routed so that it is not likely to be walked
on or pinched, especially near the plug, convenience receptacles, or where
the cord exits from the unit.
entrance
equipment
ground wire, a,b
antenna
ground clamps
discharge
unit, c
Clean unit only as recommended in its instruction manual.
to external antenna
terminals of radio receiver
The power supply cord of the unit should be unplugged from the wall outlet
when it is to be unused for a long period of time.
power service grounding
electrode system
(e.g. interior metal water pipe)
ground wire, a,b
ground clamps
Care should be taken so that objects do not fall, and liquids are not spilled,
into the enclosure through any openings.
bonding jumper, d
optional antenna grounding
electrode driven 8 feet (2.44 M) into
the earth if required by local codes.
This unit should be serviced by qualified service personnel when:
A. The power cord or the plug has been damaged; or
B. Objects have fallen, or liquid has been spilled, into the unit; or
C. The unit has been exposed to rain, or liquids of any kind; or
D. The unit does not appear to operate normally, or exhibits a marked
change in performance; or
NOTE TO CATV SYSTEM INSTALLER
This reminder is provided to call the CATV system installer’s attention to
Article 82022 of the National Electrical Code that provides guidelines for
proper grounding and, in particular, specifies that the cable ground shall
be connected to the grounding system of the building, as close to the
point of cable entry as practical.
E. The device has been dropped, or the enclosure damaged.
DO NOT ATTEMPT SERVICING OF THIS UNIT YOURSELF.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
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Congratulations on your decision
to purchase the GTP-602 tuner/
Placing the GTP-602
Although the GTP-602 does not gen-
erate much heat, it is good practice
to provide adequate ventilation for
the unit. Therefore, the GTP-602
should be kept away from external
sources of heat such as radiators and
hot-air ducts.
Safety Information
There are no user serviceable parts
inside. Refer all servicing to qualified
service personnel.
preamplifier. Your new ADCOM compo-
nent was designed to deliver incredi-
ble sound and years of reliable perfor-
mance. Audition the GTP-602 paired
with an ADCOM power amp and DVD
player and you will experience what
high performance is all about. To real-
ize the full potential of your GTP-602,
and before making any connections
to it, please read these operating and
installation instructions thoroughly.
The unit must be connected to a power
supply only of the type and voltage
specified on the rear panel. Connect
the component to the power outlet only
with the supplied power supply cable or
an exact equivalent. Do not modify the
supplied cable. Do not defeat grounding
and/or polarization provisions. The
cable should be connected to a 3-pin
polarized wall outlet, matching the
wide blade of the plug to the wide slot
of the receptacle. Do not use extension
cords. Do not route the power cord
where it will be crushed, pinched,
bent, exposed to heat, or damaged in
any way. Pay particular attention to
the power cord at the plug and where
it exits the back of the unit. The power
cord should be unplugged from the wall
outlet if the unit is to be left unused
for a long period of time. Immediately
stop using the component and have
it inspected and/or serviced by a
qualified service agency if:
We recommend that you exercise care
when placing components on top of the
GTP-602. If you are placing a heat pro-
ducing component (such as an ampli-
fier) on top of or below the GTP-602, it
is recommended that you allow at least
three (3) inches vertical spacing for
proper airflow.
Key Features
• RDS tuner
• Phono input stage
• RS 232 control
We also recommend that you leave five
(5) inches of space behind the unit for
additional airflow and to allow space
for interconnects to hang freely.
• Torriodial power transformer
Unpacking the GTP-602
Before your new ADCOM tuner-pream-
plifier left our factory, it was carefully
inspected for physical imperfections
and tested for all electrical parameters
as a routine part of ADCOM’s system-
atic quality control. This, along with
full operational and mechanical test-
ing, should ensure a product flawless
in both appearance and performance.
After you have unpacked the GTP-
602, inspect it for physical damage.
Save the shipping carton and all pack-
ing material as they are intended to
reduce the possibility of transporta-
tion damage should the preamplifier
ever need to be shipped again. In the
unlikely event damage has occurred,
notify your dealer immediately and
request the name of the carrier so a
written claim to cover shipping dam-
ages can be initiated. The right to a
claim against a public carrier can be
forfeited if the carrier is not notified
promptly in writing and if the shipping
carton and packing materials are not
available for inspection by the carrier.
Save all packing materials until the
claim has been settled.
"
5
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• the power supply cord or plug has
been damaged;
• objects have fallen or liquid has
been spilled into the unit;
If you observe these recommenda-
tions, the GTP-602 will perform reliably
in any reasonable environment. You
should also pay attention to such nor-
mal considerations as protection from
excessive dust and moisture.
• the unit has been exposed to rain;
• the unit shows signs of improper
operation; or
• the unit has been dropped or
damaged in any way.
The optimal performance of your new
GTP-602 will ultimately depend on the
care with which you make the connec-
tions between the amplifier, preampli-
fier and loudspeakers. All input and
output signal connections should be
made only with high quality, low-loss,
low capacitance cables. For recom-
mendations of the type and quality of
interconnections that are best for your
applications, consult with your ADCOM
retailer.
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GTP-602 Front Panel
1
2
3
4
3
5
6
[ ] Power Button
1
[ ] RDS Tuner Buttons [ ] Equalization
3
5
[ ] Source Buttons
2
[ ] Power Button
4
[ ] Volume knob
6
NOTE: In stand-by mode the GTP-602
uses very little power. However, it is
recommended that you switch the unit
completely off, using the rear panel
switch if it is not going to be used for
more than a couple of days. When
the GTP-602 is plugged into the wall,
current may still be flowing into the
transformer. Only when the GTP-602 is
unplugged is all current into the device
stopped.
[ ] Equalization Buttons
5
Description of Unit
1.1 Interface Overview
These buttons provide control of adjust-
ments to bass, treble and the balance
functions. To adjust these functions,
first push the treble, bass or balance
button, then use the up/down buttons
to the left of the display to make the
desired change. In the bypass mode the
bass and treble circuits are removed
from the circuit path.
The GTP-602’s front panel is designed
for ease of operation. All controls are
logically grouped for easy, intuitive
operation. Familiarize yourself with the
preceding diagram and read the short
explanations of each feature below.
When you finish, you will be well on
your way to enjoying the GTP-602’s con-
venience and sound quality.
[ ] Volume Knob
6
[ ] Source Buttons
2
The Volume control adjusts the overall
loudness of the signals being fed to the
preamplifier outputs. Unlike conven-
tional controls, the GTP-602’s volume
control doesn’t have a start or end posi-
tion. Volume can also be adjusted from
the remote control using the volume up
or down buttons. The Volume control
does not affect recordings made using
the Tape outputs. Volume setting can
range from -80dB to +10dB.
The source buttons are used to select
the device to which you would like to
listen. The LED in the button of the
active source will be illuminated.
[ ]
1 Power Button
The power button on the front panel
toggles the unit between the “on”
mode and the “stand-by” mode. For the
GTP-602 to be in the “on” or “standby”
mode, the rear panel power switch
must be in the on postion (see next
section for details). In the “on” mode
the LED in the power button will be
red and the front panel display will be
illuminated, in the “stand-by” mode the
LED will be amber and the front panel
display will be off. If the unit is in the
“standby” mode, the remote control
can be used to switch the unit on.
[ ] RDS Tuner Buttons
3
These buttons are utilized to control
the AM/FM tuner. The RDS tuner over-
view provides more detail on their
operation.
[ ] Display Window
4
The display area shows all vital informa-
tion when the unit is operational.
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remote. Stations can also be tuned
manually.
RDS Tuner Overview
Listeneing to a radio station that
you have preset:
NOTE: Tuner reception cannot take
place unless an appropriate AM and/
or FM antenna is connected to the
rear panel of the GTP-602.
1. Set the GTP-602 to tuner.
2. Use the keypad on the remote
control to select the preset that you
want to hear.
To operate the tuner:
The tuner frequency changes to the
new station in the preset memory of
the GTP-602.
1. Press the tuner button on the
remote control once, or press the
tuner button on the front panel.
2. Press the AM/FM button on the
remote control or the front panel to
change between AM and FM bands.
To change a preset radio station:
1. Tune to the new radio station you
desire.
FM/AM Button: Toggles between AM
and FM frequency bands.
3. Use the tune buttons on the front
panel or the remote to change the
tuner frequency. The new frequency
will be displayed to the right of the
FM or AM indicator.
2. Press and hold the mem button on
the remote or the memory button
on the front panel. The display will
change to show the word “memory”
along with a flashing number.
FM mode Button: Sets the FM tuner
to mono mode. The word mono
appears next to the tuner preset
number in the front panel display.
Pressing the button again returns the
FM tuner to stereo mode.
4. Press and hold either the tune
buttons on the front panel or on the
remote to scan continuously up or
down the selected band.
3. Enter the new preset/memory
location (01 through 12) using the
keypad on the remote or the up and
down buttons. This replaces the pre-
viously memorized preset with your
new selection. You have approxi-
mately five seconds to enter a num-
ber.
memory Button: This button is used
to program preset stations. See the
instructions following for more infor-
mation.
5. Press the FM mode button on the
front panel to toggle between stereo
and mono.
tune/preset button: This button
toggles the tuner between the direct
tuning mode and the preset selection-
mode.
If an FM station produces lots of noise
or sound that cuts in and out while
in stereo, use the FM mode button to
switch from stereo to mono.
Up and Down Buttons: The func-
tion of these buttons depends on the
tuning mode selected with the tune/
preset button.
To preset a radio station into
memory:
1. Tune to the radio station you desire.
In preset mode (indicated in the
display area): Press the down button
to scroll to a lower number preset;
press the up button to scroll to a
higher preset number. This is a “wrap-
around” function, so that going from
the highest number preset, the tuner
will go to the lowest preset number
or vice-versa when tuning either up
or down.
2. Press and hold the mem button on
the remote or the memory button on
the front panel for 3 seconds to store
a station into a preset location. The
display will change to show the word
“memory” along with a flashing num-
ber.
3. Use the up or down buttons to
select the preset number that you
wish program. This programs the cur-
rent radio station to that memory
location. You have approximately five
seconds to enter a number.
In tune mode: Press the up or down
button to adjust the frequency cur-
rently being received. You can also
press and hold the buttons to make
faster adjustments.
The GTP-602 tuner can receive AM,
FM and FM stereo broadcasts. Up
to 24 stations can be preset and
accessed from the front panel or
ADCOM GTP-602 Owner’s Manual | 7
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GTP-602 Rear Panel
7
8
9
10 11
12 13
14
15 16
17
[ ] Antenna Connections [ ] Phono Input
7 11
[ ] RS232 Control Input
15
[ ] CD Analog Inputs
8
[ ] IR Input
12
[16] Power Switch
[ ] Auxiliary Analog Inputs [ ] 12V DC Trigger
9 13
[ ] AC Power Input
17
[ ] Tape Inputs/Outputs [ ] Main Audio Outputs
10
14
RED centers = RIGHT CHANNEL
ANALOG AUDIO inputs or outputs
FM Antenna: A ribbon wire FM anten-
na is included and should be connect-
ed to the FM connector at the rear of
the unit using the adapter supplied.
The ribbon aerial should be mounted
on a vertical surface and placed so
that it forms a ‘T’.
1.2 Inputs & Outputs
System Connections
WHITE centers = LEFT CHANNEL
ANALOG AUDIO inputs or outputs
Like the front panel, the GTP-602’s
rear panel is carefully arranged to
make hookup, configuration, and use
as simple as possible. However, the
GTP-602’s capabilities take some study
to use most effectively. We strongly
suggest that you read this section of
the manual before beginning to hook
up your system. You will save yourself
much time and effort if you carefully
think out what you expect from your
system: consider the components you
will use, where they’ll be placed,
and how you will want them to work
together. The diagrams and notes in
this section will probably answer most
of your questions about interfacing
the GTP-602 with other components in
your system.
[ ] Antenna Connections
7
Experiment with placement of the
antenna to find the position that
gives the best signal strength and
lowest background noise. An inad-
equate FM signal normally results in
high levels of hiss, especially in ste-
reo, and interference from external
electrical sources. In areas of poor
FM reception, the tuner section’s per-
formance can be improved by using
an externally mounted FM antenna. A
qualified aerial installer will be able
to advise and fit a recommended aer-
ial for your reception conditions.
AM Antenna: An AM loop antenna is
supplied with the GTP-602 and is
required for AM reception. Open the
clip terminal lever and insert the
wire from the antenna. Closing the
lever will lock the wire in place. Test
various positions for the antenna, but
always ensure the loop is placed verti-
cally for best reception. Placing the
antenna close to large metal items
such as metal shelves or radiators may
interfere with reception.
NOTE: When reception is not satis-
factory using the supplied AM loop
antenna alone, connection of an
external antenna is recommended.
The antenna cable to the loop anten-
na must not exceed three meters.
Note that the GTP-602’s RCA-style
jacks have color-coded centers to
make connections easier. Use this key
to help route cables properly:
[ ] CD Analog Inputs
8
Input for CD player (analog audio sig-
nal) or other line-level signal source.
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Use a twin RCA-to-RCA lead to con-
nect the CD player’s left and right
‘Audio Outputs’ to this input.
[ ] Auxiliary Analog Inputs
9
Input for any line-level signal source.
Use a twin RCA-to-RCA lead to con-
nect the CD player’s left and right
‘Audio Outputs’ to this input.
[ ] Tape Inputs/Outputs
10
Connections for analog recording and
playback to an audio tape recorder
of any type, such as a cassette, reel-
reel, DAT, MD or CD-R. Using twin
RCA-to-RCA leads, connect to the
left and right ‘Audio Output’ of the
tape machine to the TAPE IN connec-
tors for playback. Connect the left
and right ‘Audio Input’ of the tape
machine to the TAPE OUT connectors
for recording.
[ ] 12V DC Trigger
13
[ ] Power Switch
16
To facilitate remote turn-on and
The rear panel power switch should
be turned off if the system will not be
in use for an extended period of time.
When the power switch is in the off
position the GTP-602 is not using any
turn-off of other components (power
amplifiers, for example), this 3.5mm
mini-jack provides a constant signal
(12 volts DC) whenever the GTP-602
is fully powered. When the GTP-602 is power from the AC wall circuit. This
turned off (via the front panel switch) switch must be on for the GTP-602 to
or placed in standby mode (via the
operate in the “stand-by” mode.
[ ] AC Power Cord
17
After you have completed all con-
nections to the amplifier, plug the AC
line cord into a “live” wall socket.
Use only the supplied power cord or
equivalent.
“power” button on the remote con-
trol), the jack has no output.
[ ] Phono Inputs
11
Input for a phono (record) player
(analog audio signal) Use a twin RCA-
to-RCA lead to connect the phono-
player’s left and right ‘audio outputs’
to this input.
[ ] Main Audio Outputs
14
Before making any connections, check
that the GTP-602 and the power
amplifiers it will be connected to are
switched off. Connect the RCA-to-RCA
leads from the GTP-602 to your exter-
nal amplifiers. The three pairs of out-
puts all carry the same signal.
[ ] IR Input
12
The IR input allows hook up of an
external IR sensor that sends IR infor-
mation to the microprocessor in the
GTP-602. This feature can be very use-
ful if the GTP-602 is placed behind a
non transparent door or is used with an
after market remote control system.
[ ] RS232 Control (DB 9)
15
Allows control of the GTP-602 via com-
puter or home automation system.
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GRC-820 Remote Control
[ ] Power Button
18
19
[ ] RDS Button
19
18
20
[ ] Tuner Preset Buttons
20
[ ] Scan Button
21
[ ] Bass and Treble
22
23
21
[ ] Bypass
23
[ ] Balance Control
24
22
25
24
[ ] GDV-850 Control
25
[ ] Volume Up
26
[ ] Volume Down
27
[ ] Mute
28
31
26
28
32
[ ] Tune Up
29
29
30
[ ] Tune Down
30
27
33
[ ] AM/FM
31
34
[ ] FM Mode
32
[ ] Tune/Preset
33
35
[ ] Memory
34
[ ] Sources
35
52
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bass and treble adjustments. The
adjustment range is from +8dB to
+10dB.
[ ] FM mode
32
2.1 GRC-820 Overview
The GRC-820 is designed specifically
for use with the GTP-602. We hope
you find the layout of the controls
simple to use. Note, there are also
controls for use with an ADCOM DVD
player, should you wish to utilize
our GDV-850 in your system with the
GTP-602. The following text provides
information on each functional area
of the the GRC-820.
The FM mode button toggles the GTP-
602 between the stereo and mono
reception mode while listening to FM
radio.
[ ] Bypass
23
The bypass button provides a more
direct signal path that reroutes the
audio signal around the bass and
treble adjustment circuits, thus pro-
viding a cleaner sound. The bass and
treble functions are not in the circuit
when the bypass mode is engaged.
[ ] Tune/Preset
33
This button toggles the tuner between
the direct tuning and the preset sta-
tion mode.
[ ] Memory
34
The GRC-820 needs two AAA batteries
which are installed into the back of
the remote control. Alkaline batteries
are recommended for maximum oper-
ating life. When replacing batteries,
check that they have been put in cor-
rectly, as indicated on the base of the
battery compartment.
This button is used to store tuner presets.
[ ] Balance Control
24
This control moves the center image
between the left and right speakers
and can be used to correct for center
image localization.
[ ] Sources
35
These buttons are used to select the
device to which you would like to listen.
[ ] DVD Player Control
25
These buttons provide control for an
[ ] Power Button
18
ADCOM DVD player such as the GDV-850.
This button toggles the GTP-602
between the “on” mode and the
“stand-by” mode. Note, the rear
panel power switch on the GTP-602
must be in the on position for the
GRC-820 to control the GTP-602
[ ] Volume Up
26
This button increases the level of the
sound you hear from your system.
[ ] Volume Down
27
This button decreases the level of the
sound you hear from your system.
[ ] RDS Button
19
When listeing to FM radio stations
that broadcast RDS data, the RDS
button displays the information made
available using the Remote Data
[ ] Mute
28
This button “turns off” the sound com-
ing from your system. Push the button
a second time to restore the previous
level.
System on the front panel of the GTP-
602. This information can be the for-
mat of the radio station or song spe-
cific. The information you will receive
is determined by the broadcaster.
[ ] Tune Up
29
This button is used to change the radio
station. It functions in both the preset
mode and the tune mode.
[ ] Tuner Presets
20
These buttons provide direct access
to both FM and AM presets that are
programmed into the GTP-602.
[ ] Tune Down
30
This button is used to change the radio
station. It functions in both the preset
mode and the tune mode.
[ ] Scan Button
21
This button engages the scan funtion
which provides a brief listeing pre-
view to all the preset staions. Press
the button again to end the function.
[ ] AM/FM
31
This button toggles the tuner between
the FM and AM setting.
[ ] Bass and Treble
22
These buttons provide access to the
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IR Command List for ADCOM GTP-602
1AE5h: Custom Code(A)
Code:NEC
1AE8h: Custom Code(B)
Code:NEC
Button
HEX
DECIMAL
128
136
137
138
139
132
134
213
209
130
217
218
88
Function
Power On
HEX
DECIMAL
84
Power
0x80
0x88
0x54
0x55
0x56
0x57
0x16
0x17
0xC9
0xCA
0x8B
0xC8
0x14
0x15
CD
Power Off
Mute On
85
tuner
0x89
0x8A
0x8B
0x84
86
tape
Mute Off
87
aux 1
Bypass On
Bypass Off
AM
22
aux 2
23
phono
0x86
201
202
139
200
20
volume up
volume down
mute
0xD5
0xD1
0x82
FM
Tune mode
Preset Mode
FM mono mode
FM stereo mode
balance left
balance right
treble up
0xD9
0xDA
0x58
0x59
0x5A
0x5B
0x4D
0x8F
0xCD
0x8C
0x8D
0xCE
0x02
21
treble down
bass up
89
90
bass down
bypass
91
77
AM/FM
143
205
140
141
206
2
tune/preset
tune up
tune down
FM mode
rds
memory
0x0B
0xD3
0x90
0x91
0x92
0x93
0x94
0x95
0x96
0x9C
0x9D
0x9E
0x9F
0xDC
11
preset scan
tuner preset 1
tuner preset 2
tuner preset 3
tuner preset 4
tuner preset 5
tuner preset 6
tuner preset 7
tuner preset 8
tuner preset 9
tuner preset 10
tuner preset 11
tuner preset 12
211
144
145
146
147
148
149
150
156
157
158
159
220
12 | ADCOM GTP-602 Owner’s Manual
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SYMPTOM
No sound
POSSIBLE REASON
POSSIBLE SOLUTION
• Power AC lead unplugged or
power not switched on
• Tape Monitor selected
• Mute on
• Check if AC lead is plugged in
and power switched on
• De-select Tape Monitor mode
• Switch off Mute
• Turn on the Power Amplifier
• Power Amplifier not on
No sound on one channel
• Speaker not properly connected
or damaged.
• Input lead disconnected or
damaged
• Check connections and speakers
• Check leads and connections
• Select appropriate Surround
mode (large or small)
No sound on surround channels
(for digital preamplifiers)
• No surround mode selected
• Mono sound source
• Speakers not properly
connected
• Select a Surround Mode
• Test system with Stereo or
Dolby Surround material
• Check speakers and connections
• Increase surround volume level
• Surround volume level too low
No sound on center channel
(for digital preamplifiers)
• In Setup “OFF” for center
speaker selected
• Speaker not connected properly
• Center volume level set too low
• Select appropriate Center
mode (large or small)
• Check speaker and connection
• Increase center volume level
“Dolby Digital” OR “DTS” auto-
detection in digital preamp.
• Source not connected using
digital input
• Bit Stream is PCM
• Connect digital output of source
to GTP-602
• Check source material
Weak bass/Diffuse stereo image
• Speakers wired out of phase
• Check connections to all
speakers in the system
Remote control handset not working
• Batteries dead, or incorrectly
inserted
• Check or replace batteries
• Remove obstruction
• IR transmitter or receiver
windows obstructed
• Place unit away from direct sun,
reduce amount of ambient light
• IR receiver in direct sun or very
bright ambient light
No sound with tuner
• Antenna leads incorrectly
connected
• Station not selected or weak
signal with FM Mute on.
• Check antenna connections to
preamplifier
• Re-tune or switch off FM Mute
Noise, hiss on AM and FM
Distortion on FM
• Weak signal
• Check station tuning. Adjust or
replace antenna.
• Multi-path signals or interfe-
ence from another station
• Check station tuning. Adjust or
replace antenna
Whistles or buzzes on FM & AM
• Interference from other
electrical sources - computers,
games consoles
• Check station tuning. Switch off
or move the source of the
electrical noise
Whistles or buzzes on AM
No RDS name (PS)
• Interference from fluorescent
lighting or electrical motor
• Check station tuning. Adjust or
replace AM antenna
• Station signal too weak.
• Station not transmitting RDS data
• Check station tuning. Adjust or
replace antenna
• No remedy
ADCOM GTP-602 Owner’s Manual | 13
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or the first component the cable is connected to (i.e. the
cable box, or VCR). If the hum is no longer present, you
must insert a “75Ω ground loop isolator” before reconnect-
ing the line. You should check with your ADCOM dealer to
obtain one. If the “75Ω ground loop isolator” works only
partially or not at all, then please read note 2 to complete
the troubleshooting procedure.
Troubleshooting
Use the troubleshooting notes above to solve common
situations that don’t require professional attention. If the
steps stated in possible solution do not resolve your prob-
lem, then please contact your ADCOM dealer or call the
ADCOM customer service department. Any problems not
covered here should be brought to the attention of your
ADCOM dealer or ADCOM customer service department.
Note 2: Make sure that the power amplifier is at least 6”
from processor or other equipment using microprocessors.
Usually putting another component between them is suf-
ficient to minimize the hum. If this does not reduce the
hum, turn the system off and disconnect all Inputs from
the amplifier. If the hum still persists, then your dealer or
service center must examine the unit/system. If the hum
disappears, try another set of RCA cables. Connect one RCA
cable at a time to see if one specific cable is responsible.
If any or all cables cause the hum to appear, then the unit
should be evaluated for proper operation by your dealer or
authorized service center. Please see our website or call us
for a list of authorized service centers in your area.
A special note on “hum:” When there is a low-volume
“hum” audible throughout your speakers, even with the
main volume turned all the way down, you have a com-
mon phenomenon known as a “ground loop.” A ground loop
is basically a difference in ground voltages between two
or more components which are connected electrically and
which creates multiple current paths where there must only
be one. This difference in potentials creates a 60Hz low-
level sound (approximately a low A), that seems to “hum.”
It can be caused by adding new components to your system,
but that does not imply there is anything electrically wrong
with any new component. With the advent of audio/video
and home theater systems, the problem has become com-
monplace. Generally, the cause is the Cable-TV incoming
signal line. This new incoming line may add an additional
ground at a different potential to the AC line ground of
your other equipment (refer to note I and 2, to trouble-
shoot a hum problem).
Servicing
ADCOM has a technical service department to answer
questions pertinent to the installation and operation of your
unit. In the event of difficulty, please contact us for prompt
advice. If your problem cannot be resolved through our
combined efforts, we may refer you to an authorized repair
agency, or authorize return of the unit to our factory. To aid
us in directing you to a convenient service center, it would
be helpful if you indicate which major city is accessible to
your home.
Note 1: Cable TV systems can sometimes contribute to
ground loop problems which cause “hum.” To determine
if your cable system is the contributing factor, disconnect
the Cable-TV incoming signal line (round, 75Ω) at the wall,
Troubleshooting Tip
Your GTP-602’s circuitry is built around advanced microprocessors. The GTP-602 may exhibit
occasional anomalies arising from AC line surges, etc. If you experience unexpected behavior,
or if the GTP-602 “locks up” and does not respond to control input, reset it by turning the rear
panel power switch off. (Do not use the remote control’s “power” button). Wait 10 seconds and
then turn the GTP-602 on using the rear panel power switch.
14 | ADCOM GTP-602 Owner’s Manual
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ADCOM warrants this product against defects in materials or
workmanship for a period of ninety (90) days after the date
of original purchase from an ADCOM authorized dealer.
During this period, ADCOM will repair or replace a defective
product or part, at our option, with a new or refurbished
product or part without charge to you, as long as you follow
the procedures listed below.
Please address mail inquires to:
ADCOM Service
8541 East Anderson Drive
Scottsdale, Arizona 85255 USA
Phone, Fax or Email inquires to:
Voice: (480) 607-2277 or Fax: (480) 348-9876
Monday through Friday, 8:00 AM to 4:00 PM MST
Email: [email protected]
All implied warranties, including implied warranties of
merchantability and fitness for a particular purpose are
limited in duration to the duration of the warranty period.
For fax inquires, please include a return fax number for the
reply. When calling or writing about your ADCOM product,
be sure to note and refer to its serial number as well as
the date of purchase and the dealer from whom it was
purchased. In any communications to us, please include
a daytime phone number where we may reach you. In
the event the unit must be returned to our factory for
service, you will be instructed on the proper procedure
when you call or write for a return authorization. Under no
circumstances should your unit be shipped to our factory
without prior authorization, or packed in other than its
original carton and fillers.
This warranty excludes all incidental and consequential
damages, unless contravened by state law. This warranty
gives you specific rights and you may have other rights
which vary from state to state.
No person, agent, distributor, dealer, or company is
authorized to change, modify or extend the terms of these
warranties in any manner whatsoever.
Your Responsibilities
The above warranties are subject to the following conditions:
(1) You must retain and present your dated invoice or bill
of sale to provide proof of original purchase from an ADCOM
Authorized Dealer and coverage under the warranty period.
If the original shipping carton and its fillers have been lost,
discarded, or damaged, a duplicate carton may be obtained
from our service department for a nominal charge.
(2) You must notify us within ten (10) days after you
discover a defective product or part.
Always ship prepaid via United Parcel Service (UPS) or other
approved carrier. Do not ship via parcel post, since the
packing was not designed to withstand rough parcel post
handling. Improper shipment of the product will void your
warranty coverage.
(3) All warranty servicing of this product must be done by
ADCOM or an authorized ADCOM Service Center.
(4) This warranty is only valid if this product has been
purchased and used in the United States. Warranty coverage
for products purchased and used outside of the United
States is provided by local ADCOM authorized distributors.
Warranty
ADCOM, a division of Klein Technology Group, LLC, makes
the following limited warranties. These limited warranties
extend to the original purchaser or any person receiving this
product as a gift from the original purchaser and to no other
purchaser or transferee. There is no warranty provided by
ADCOM for products purchased from unauthorized outlets
or dealers or from previous owners.
(5) Charges by third parties for set-up, installation,
adjustments, shipment, insurance, and other charges are
not covered by this warranty.
(6) This warranty extends only to defects in material or
workmanship as limited above and does not extend to any
product or part which has been lost or discarded by you, or
to damage to products or parts caused by misuse, accident,
Acts of God such as lightning or fluctuations in electrical
power, improper installation, improper maintenance or use in
violation of instructions provided in this Owner’s Manual, or to
products which have been altered or modified. This warranty
does not extend to products which have had the serial number
removed, altered, defaced, or rendered illegible.
LimitedFive Year Warranty (Home, Non-Commercial Use Only)
ADCOM warrants this product against defects in materials or
workmanship for a period of five (5) years after the date of
original retail purchase from an ADCOM authorized dealer.
During this period, ADCOM will repair or replace a defective
product or part, at our option, with a new or refurbished
product or part without charge to you, as long as you follow
the procedures listed below.
(7) Physically damaged products are not covered by this
warranty and will be returned as received without repair.
Limited Ninety (90) Day Warranty (Commercial Use Only)
ADCOM GTP-602 Owner’s Manual | 15
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GTP-602 Specifications
Input Impedance
Audio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47k Ω
Output Impedance
Audio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 550 Ω
Frequency Response
20Hz to 20kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 0.2dB
THD+Noise at Rated Output
20Hz to 20kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≤ 0.005%
IM Distortion
CCIF at 15kHz and 16kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≤ 0.004%
Signal to Noise Ratio (at 1kHz “A” weighted)
Ref. to 1V input, max output voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . > 105dB
Sensitivity 1 volt output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170mV
Subwoofer Crossover Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100Hz
Crosstalk (@ 1kHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . > 80dB
Maximum Output Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.0V
Tone Controls (L and R front only)
Bass effective below . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400Hz
Bass Max Gain/Cut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +8dB/-10dB @ 20Hz
Treble effective above . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5kHz
Treble Max Gain/Cut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . + 8dB/-10dB @ 20Hz
FM Tuner
Usable Mono Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15dBµ
50 dB Mono Quieting Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22dBµ
50 dB Stereo Quieting Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39dBµ
A-wtd. Signal to Noise Ratio
Mono . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75dB
Stereo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70dB
Stereo Separation (1 kHz). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43dB
Alternate Channel Selectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . >50dB
Capture Ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2dB
General
Power (user selectable 120/230 VAC). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
120VAC/50-6OHz
Chassis Dimension. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5” (89mm) x 17” (432mm) x 14.75” (375mm)
Maximum Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4” (102mm) x 17” (432mm) x 16.5” (419mm)
Weight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 lbs. (6.8kg)
Weight, Packed. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 lbs. (9.1kg)
8541 East Anderson Drive, Scottsdale, Arizona 85255
voice: (480) 607-2277 fax: (480) 348-9876
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