No Acoustic Line Monitor - Oki B 4100 Maintenance Manual

7.2.16 No Acoustic Line Monitor

There are two source routes of acoustic line monitor:
(a) General communication signal
(b) DP pulse signal
MONITOR VOLUME
(Function program No. 06)
MONITOR CONTROL
(Technical function No. 02)
Connect oscilloscope probe
across CN8-01 (SP) and
The signal appears?
Replace MCNT Board.
Signal route:
CN6-A6, B6 (R) IC12-1 (RM)
TR1-2 IC11-3 IC5-5
40055101TH Rev.4
Start
No
has been set to
LOW or HIGH?
Yes
Yes (OFF)
has been set to OFF?
No (ON)
CN8-02 (AG).
Yes
No
No
A message can be
received normally?
Yes
Set MONITOR VOLUME
to LOW or HIGH.
Set it to ON.
Replace the speaker.
Go to 7.2.9.
(Reception problem)
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