Oki OKIOFFICE84 Maintenance Manual page 205

A
The error counter of LCD
stops counting up?
No
Receive signal appears
across L1 and L2?
Yes
Receive signal appears
across CN3-19, 20 (R) and
CN3-7 (GND) of WN5
board?
Yes
Replace MCNT Board.
Signal route:
CN10-A6, B6 (R)→IC12-3→
IC8-60 (RXA1)→
IC8-26 to 33 (D0 to D7)
Return to section 7.1
RX (Receiver)
Yes
RX End
No
Check the line.
No
Yes
Replace NCU Board.
Yes
Solved?
No
Replace MCNT Board.
7 - 17
Signal route:
CN1-3, 4→RL1-8, 5→
T1-1, 3→T1-2, 6→
CN3-19, 20 (R)
Possible cause:
CML signal
40672201TH Rev. 4