Oki B4100 - Manual (Page 302)

40055101TH Rev.4 302 /
7.2.12 Tone Send Test
Perform TONE SEND TEST.
(See Chapter 6.8.)
Start
No
Tones appear at
L1 and L2?
Connect leads of frequency
counter (or oscilloscope)
across the line terminals
L1 and L2.
Yes
Note 1:
Note 2:
Tones appear across Pin A8, B8 (S)
and Pin A12, B12 (0V) of CN6 (MCNT)?
Replace MCNT board.
Replace WN5 Board.
Solved?
Replace MCNT Board.
Signal route:
IC8-26 to 33 (AD0 to AD7)
→
IC8-1, 2
→
IC12-7
→
IC29-13
→
IC29-3
→
IC30-1 (S)
→
CN6-A8, B8 (S)
Signal route:
CN3-15, 16
→
T1-3, 1
→
CN1-3, 4
Possible cause:
CML signal
End
Return to section 7.2.1
No
Yes
Yes
No
The tonal frequency (2100 Hz) will be sequentially
sent for 5 seconds on the line terminals L1 and L2.
As an example, signal route uses the WN5 (NCU)
board.