Mf Send Test - Oki OKIFAX4550 Maintenance Manual

7.14

MF Send Test

Start
Connect oscilloscope probe
across the line terminals
L1 and L2.
Perform MF SEND TEST.
(See 6.12.)
MF signal appears
across L1 and L2?
Yes
End
Return to section 7.1
41309401TH Rev.4
No
MF signal appears across CN10-A4
(S) and CN10-B1 (0V) of MCNT Board?
Yes
Replace NCU Board.
Yes
Solved?
No
Replace MCNT Board.
No
Replace MCNT Board.
Signal route:
<46F>
IC8-87 to 95 (D0 to D7)→
IC8-28, 29→IC12-7 (S)→
CN10-A4 (S)
<R46>
IC6-87 to 95 (D0 to D7)→
IC6-28, 29 → IC10-7 (S)→
CN10-A4 (S)
Possible cause:
CML signal
236 /