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1. One of transmitting lines (T-Line) is disconnected.
Sympton: 2-1 A can make dialing without dialing tone.
2-2 When B dials A , busy tone or dial tone will be
heard at B immediately after the calling tone.
LMU Lamps ----- Normal
Station
EXCHANGE
EXCHANGE
Symptom
1-1
1-2
1-3
1-4
1-5
A can make dialing.
A can hear B .
B can not hear A .
Noise is heard at B .
Noise increases at B when Press-To-Talk bar is
pressed at A .
LMU Lamps
Normal
2. One of receiving lines (R-Line) is disconnected.
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