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8-2. HOW TO FIND SHORT BETWEEN T-LINE AND R-LINE
If the shorted condition between T-line and R-line is not
corrected for a long time, it may burn out the guard re-
sistor (330 , 1/2W) on the LMU board. Therefore, find
the shorted line according to the following procedure:
1. Turn off the privacy switch on all stations in the
system.
2. Turn on the power switch of the system for several
seconds, then, turn it off.
3. Watch the lamps on the LMU panels. The lamps on
normal lines will go off after approximately 0.5
second. The lamps on the shorted lines will stay
on more than 0.5 second.
Normal
Abnormal
(Short)
Lamp goes off gradually
Power ON
Lamp ON
Lamp ON
(Brighter than normal)
OFF
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