Mf Send Test - Oki B 4100 Maintenance Manual

7.2.14 MF Send Test

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