Adcom Stereo Amplifier GTP 602 User Manual

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.  
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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.  
ADCOM GTP-602 Owner’s Manual | 5  
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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  
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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  
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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