Oki B4100 User Manual
Page 255
40055101TH Rev.4
255 /
7.1.16 No Acoustic Line Monitor
There are two source routes of acoustic line monitor:
(a)
General communication signal
(b)
DP pulse signal
Start
No
MONITOR CONTROL
(Technical function No. 02)
has been set to OFF?
Replace MCNT Board.
The signal appears?
Replace the speaker.
Connect oscilloscope probe
across CN8-01 (SP) and
CN8-02 (AG).
MONITOR VOLUME
(Function program No. 06)
has been set to
LOW or HIGH?
Set MONITOR VOLUME
to LOW or HIGH.
No (ON)
Yes
Yes
Yes (OFF)
Set it to ON.
A message can be
received normally?
Go to 7.1.9.
(Reception problem)
No
Yes
Signal route:
CN10-A6, B6
→
IC12-1 (RM)
→
TR1-2
→
IC11-1
→
IC11-3
→
IC5-5
No
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