Oki OKIOFFICE84 Maintenance Manual page 463

7: Sending NG
Call origination is impossible
No
Protocol signal receiving is NG
No
Signals cannot be sent.
During protocol signal sending,
sine wave or modulated sine wave
output is provided between pins 1
and 2 of IC8
Yes
During protocol signal sending,
sine wave or modulated sine wave
output is provided at pin 7 of IC12
Yes
Check CN10.
40672201TH Rev. 4
Yes
Call origination mode
is (DP or PB)
PB
Yes
During protocol signal receiving,
sine wave or modulated sine wave
input is provided between pins 2
and 3 of IC12
Yes
During protocol signal receiving,
sine wave or modulated sine wave
input is provided between pins 60
and 61 of IC8
Yes
No
Replace IC8.
No
H - 8
DP
Pin 2 of IC2 repeats 5V
No
and 0V cyclically during DP
Replace IC2.
No
No
Replace IC12.
call origination
Yes
Check CN10.