Oki OKIOFFICE84 Maintenance Manual page 467

11: PC/IF does not
operate correctly
Pin 11 of CN11
(BUSY-P) is near 0V
Yes
Waveform of pin 1 of
CN11 (STB-N) is similar to
Figure 11-2
Yes
Signal output waveforms of
pins 4, 8 of IC20 are similar to
Figure 11-1 (IC20-8: ACK,
IC20-4: FLT)
Yes
Check CN11 connection.
40672201TH Rev. 4
No
Pin 11 of IC20 is near 0V
Yes
Replace IC20.
No
Check CN11 connection.
No
Signal input waveforms of
pins 3, 9 of IC20 are similar to
Figure 11-1 (IC20-9: ACK,
Replace IC20.
H - 12
No
Replace IC2.
Yes
IC20-3: FLT)
No
Replace IC2.