Sound of the other
party is broken
during call.
Same sympton
remains even
the station
is replaced.
Adjust the volume control of
station speaker if the room
produces reverberation.
(Lower the volume.)
Increase the gain of MIC AMP.
Replace PCB after checking if
MIC unit is not touching its
case.
Immediately after
the calling tone,
the line switches
to cancel, busy,
dial tone, etc.
Same sympton
remains even
the station
is replaced.
One of R-Lines is disconnected.
Fault in photo coupler PC-504
on LMU.
Fault in MT-547 on LMU or in
the station.
Becomes normal
if the station
is replaced.
One of the R-Lines is discon-
nected or the station connector
is not connected properly.
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