Sending Ng - Oki OKIFAX4550 Maintenance Manual

4.1.7 Sending NG

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 28
and 29 of IC8
Yes
During protocol signal sending,
sine wave or modulated sine wave
output is provided at pin 7 of IC12
Yes
Check CN10.
41309401TH 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 at pin 32 of IC8
Yes
No
Replace IC8.
No
DP
Pin 2 of IC2 repeats 5V
No
and 0V cyclically during DP
Replace IC2.
No
No
Replace IC12.
call origination
Yes
Check CN10.
541 /