Oki B4100 - Manual (Page 253)

40055101TH Rev.4 253 /
7.1.14 MF Send Test
Start
No
MF signal appears
across L1 and L2?
Yes
MF signal appears across CN10-A8, B8
(S) and CN10-A12, B12 (0V) of MCNT Board?
Replace MCNT Board.
Replace WN5 Board.
Solved?
Replace MCNT Board.
Signal route:
CN3-15, 16
→
T1-3, 1
→
CN1-3, 4
End
No
Yes
Yes
No
Return to section 7.1.1
Connect oscilloscope probe
across the line terminals
L1 and L2.
Perform MF SEND TEST.
(See 6.11.)
Possible cause:
CML signal
Signal route:
IC8-26 to 33 (AD0 to AD7)
→
IC8-1, 2
→
IC12-7 (S)
→
CN10-A8, B8 (S)