Trouble Shooting - Adcom GTP-760 Owner's Manual

Operating Room 2 From "Room 2"
In addition to the front panel Room 2 controls, the GTP-760 provides an interface for controlling Room 2
remotely. Such a connection is technically sophisticated and usually intended only for custom
installations. Please contact your ADCOM dealer or ADCOM directly for further information on these
advanced features and capabilities.

5.0 TROUBLE SHOOTING

Your GTP-760's circuitry is built around advanced microprocessors. The GTP-760 may exhibit
occasional anomalies arising from AC line surges, etc. If you experience unexpected behavior,
or if the GTP-760 "locks up" and does not respond to control input, reset it by turning the front
power switch off. (Do not use the remote control's "power" button.) Wait 10 seconds and then
turn the GTP-760 on. This will reset the internal control circuitry and solve most problems.
SYMPTOM
Power LED does not light
Power LED glows
but no sound
No Video Output
No sound from one channel
Hum from all speakers
(any volume)
Hum from all speakers
(increases or decreases with
change in system volume)
POSSIBLE REASON
AC Power Cord not plugged in
AC Fuse failed
Power amp or source unit is not ON
Video Processor (rear panel) is ON
Connections in rear of amp are loose
Input or Output connector
disconnected or loose
Speaker disconnected
Ground loop present
(difference in ground voltages
between components)
A major appliance, dimmer,
halogen or fluorescent light may be
creating interference
Problem with source unit (CD, etc.)
Problem with cable connecting that
source to the Tuner/pre-amp
38
POSSIBLE SOLUTION
Plug in AC Power Cord
Replace AC Fuse
Make sure whole system is ON
Move video processor switch to OFF
Verify all connections on rear of amp
Verify both connections on that
channel
Verify connection at speaker
If cable TV is present, see Note 1
If cable TV is not present,
see Note 2
Make sure all appliances, dimmers
and suspect lights are off
Try different source to verify
Try different cable to verify