User`s guide

DISTRIBUTION AMPLIFIERS
400-0087-004 8
TROUBLESHOOTING GUIDE 8
We have carefully tested and have found no
problems in the supplied ISC2000 unit; however,
we would like to offer the following suggestions:
8.1 LED IS NOT LIT
Cause 1: There is no 9VDC.
Solution: Verify the 9VDC adapter is
connected to the 2 pin terminal block
input. If it is and the LED is not on,
see Solution 2.
Solution 2: Ensure there is AC power applied to
the power adapter and that the
cables are plugged in all the way. If
there is AC power and the cabling is
correct, see Solution 3.
Solution 3: Verify the power adapter is capable
of supplying 500mA. If it is and the
LED is still not on, call ALTINEX at
[phone].
8.2 NO DISPLAY
Cause 1: The source has a problem.
Solution: Check the source and make sure
that there is a signal present and all
source connections are correct.
Make sure that the input amplitude
of the video analog signals are less
than 1.5V and that the SYNC levels
are TTL. If the source is good and
there is still no display, see Cause 2.
Cause 2: Cable connections are incorrect.
Solution: Make sure that the cables are
properly connected. Also, make sure
that the continuity and wiring are
good. If there is still no display
present, see Cause 3.
Cause 3: The display has a problem.
Solution: Ensure the display has power and is
ON. If there is still no display, call
Altinex at [phone].
8.3 NO SOUND/BAD SOUND QUALITY
NOTE: For very small audio signals, the
amplifier for the speakers must necessarily
amplify both the signal and any noise in the
system. For very large audio output signals,
distortion and clipping may occur. The source
and the audio amplifier function best when the
audio levels are set to midrange values. This is
normal for an audio system regardless of
whether an ISC2000 is used.
If unwanted noise is heard on the audio circuit,
consider alternate ways of wiring the audio
output. Also, examine the system for possible
sources of noise and route the audio signals as
far as possible from the noise sources.
Cause 1: The source has a problem.
Solution: Check the source and make sure
that it is working at an appropriate
volume level and all source
connections are correct. If the
source is working and there is still
no sound, see Cause 2.
Cause 2: Audio devices are not compatible.
Solution: Make sure that the audio devices
are compatible. If so, see Solution 2.
Solution 2: Connect the receiving device directly
to the source and verify proper
operation. If there is still no sound,
see Cause 3.
Cause 3: Cable connections are incorrect.
Solution: Make sure that all cables are
connected properly. Also, make sure
that the continuity and wiring are
good. If there is still no sound
present, see Cause 4.