Troubleshooting; Resolving Problems; System Reset - Adcom GDV-850 Owner's Manual

5.2 Troubleshooting

If you are experiencing difficulties,
consult the following list for possible
solutions:
No Power: make sure the unit is plugged
in properly and make sure the rear panel
power switch is in the ON position.
Remote does not work: check the
battery installation, install new bat-
teries, aim remote at unit.
No picture: check the video cable
connection and input setting on your
TV. Turn off the progressive scan
feature via the rear panel switch or
change the video output setting using
the remote control.
Picture is noisy: do not connect unit
directly to VCR (copyguard feature
may disrupt video signal), turn off
progressive scan feature or set its
mode to VIDEO.
Picture does not fill screen: Set TV
DISPLAY type correctly.
No sound: check the audio cable con-
nection and input settings on preampli-
fier. Make sure the SPDIF output is acti-
vated when using a digital connection.
Garbled sound: Clean the disc surface.
Unit does not operate properly: To reset
the microprocessor, turn off the power,
unplug the power cord, and reconnect
the power cord. Following a sudden
temperature change (such as bringing
unit or discs inside from extreme cold),
allow several hours for possible conden-
sation to clear.

5.3 Resolving Problems

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 problem, 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.
A special note on "hum:" When there
is a low-volume "hum" audible through-
out your speakers, even with the main
volume turned all the way down, you
have a common phenomenon known
as a "ground loop." A ground loop is
basically a difference in ground volt-
ages between two or more components
which are connected electrically and
which creates multiple current paths
where there must only be one. This dif-
ference in potentials creates a 60Hz low-
level sound (approximately a low A),
that seems to "hum."
It can be caused by adding new com-
ponents 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 commonplace. 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 troubleshoot a hum problem).
Note 1: Cable TV systems can some-
times contribute to ground loop prob-
lems which cause "hum." To determine
if your cable system is the contribut-
ing factor, disconnect the Cable-TV
incoming signal line (round, 75Ω) at
the wall, or the first component the
cable is connected to (i.e. the cable
box, or VCR). If the hum is no lon-
ger present, you must insert a "75Ω
ground loop isolator" before recon-
necting 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.
Note 2: Make sure that the power
amplifier is at least 6" from the GDV-
850. Usually putting another compo-
nent between them is sufficient 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 opera-
tion by your dealer or authorized ser-
vice center. Please see our website or
call us for a list of authorized service
centers in your area.

5.4 System Reset

In rare cases the GDV-850 internal pro-
cessor may freeze or lock-up causing
abnormal operation. This is common to
all micro-processor controlled devices
when the unit is subject to exces-
sive static discharge, AC line noise, or
power spikes.
In most cases it is easy to solve this
problem by simply unplugging the
GDV-850 from its AC power source
for about five minutes. After waiting,
reconnect the power cord and turn the
unit on. If the unit functions normally,
no further action is needed.
In the event that the unit still does
not operate properly, it may be neces-
sary to manually reset the processor.
Note, however, that when the proces-
sor is reset you will lose all settings
including surround mode settings,
and speaker configurations. For this
reason we strongly recommend that
you record these settings so that it is
easy to restore them after resetting
the processor.
To reset the unit to factory default
settings you will need to enter the
discrete remote control command.
Please refer back to the discrete
remote control commands table. The
command name is "Factory Defaults,"
the IR code is 86h. This should reset
the system.
If the manual reset does not solve
the problem, contact your authorized
ADCOM dealer, an authorized ADCOM
service center or contact ADCOM's
service department directly for fur-
ther advice.
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