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8. TROUBLE SHOOTING GUIDE
Repairing of the EXES-5000 system is basically done by
replacing defective units with good ones. The system's
faults in an installation can be divided into the fol-
lowing categories.
1. Faults in an exchange
2. Faults in a station
3. Cable faults
To make system repairing easier, find which category is
involved, then refer to the chart below for assistance
in fault finding.
All stations do not operate.
Same symptom in every station.
Fault in specific station
only.
Fault in an exchange.
Cable fault. Fault in a station.
Power supply
Plug-in unit
(Common control)
Back wiring on
frame
Mis-wiring between exchange
and terminal board.
Mis-wiring such as short,
broken wire, etc.
Misconnection in station
jack.
Key board switch fault.
Board assembling fault.
Speaker, microphone fault.
Microswitch
,
connecting
cable fault.
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