STARPLUS Starplus DHS-L, Technical Manual

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6-8 System D iagnosti cs
Chapter 6 - Maintenance/Troubleshooting
Table 6-8: Static/Noise During Conversation
Symptom Diagnostic Aid Cause Corrective Action
Static and/or noise
can be heard during
a conversation Logic of
elimination If you can hear the static, is it on
intercom handset to handset calls?
If yes, do you hear the static when you
call any othe r ICM stations?
(The problem
may be the telephone called or calling
you).
Station cable wiring If static on ICM and CO line calls, verify
wall jack connection and MDF
connections. Correct any problems
found.
Bad component If noise persists, replace handset cord.
Telco problem
† If static only on outside CO calls, do
other stations hear similar static
noise?
† If other stations hear static, is it only
on one CO line? Which one?
† If on several CO lines, the Telco may
have a wet cable. Disconnect the CO
line from the KSU, and using a dial test
handset (buttset), place a call and
listen for static. If noise is present,
contact the Telco.
KSU-MDF wiring If noise is present only when the KSU is
connected to the CO lines, inspect,
repair or replace the CO line feeder
cables that plug into the KSU interface
board.
Possible module
problem
† If noise is still present on a certain CO
line, and CO incoming line cord has
been exchanged, move this cord (CO
line) to another KSU line position. If
noise is now removed on the new CO
line interface, something is bad with
the KSU input jack.
† Call Customer Service.