Oki B4100 - Manual (Page 305)

40055101TH Rev.4 305 /
7.2.14 MF Send Test
Start
No
MF signal appears
across L1 and L2?
Yes
MF signal appears across CN6-A8, B8
(S) and CN6-A12, B12 (0V) of MCNT Board?
Replace MCNT Board.
Replace NCU Board.
Solved?
Replace MCNT Board.
Signal route:
CN3-15, 16
→
T1-3, 1
→
CN1-3, 4
End
No
Yes
Yes
No
Return to section 7.2.1
Connect oscilloscope probe
across the line terminals
L1 and L2.
Perform MF SEND TEST.
(See 6.11.)
Possible cause:
CML signal
Signal route:
IC8-1, 2
→
IC12-7
→
IC29-13
→
IC29-3
→
IC30-1
→
CN6-A8, B8 (S)