Tone Send Test - Oki B 4100 Maintenance Manual

7.2.12 Tone Send Test

Start
Perform TONE SEND TEST.
(See Chapter 6.8.)
Connect leads of frequency
counter (or oscilloscope)
across the line terminals
L1 and L2.
Tones appear at
L1 and L2?
Yes
End
40055101TH Rev.4
Note 1:
Note 2:
No
Tones appear across Pin A8, B8 (S)
and Pin A12, B12 (0V) of CN6 (MCNT)?
Yes
Replace WN5 Board.
Solved?
No
Replace MCNT Board.
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.
No
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
Yes
Possible cause:
CML signal
Return to section 7.2.1
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