Oki OKIFAX 5750 Maintenance Manual page 779

3.1.2 Reading running system NG
2: Reading running
system NG
(document feed error)
Motor does not stop when
the document is fed to
PC1
No
Motor does not stop when
the document is fed to
PC2
No
F1 continuity is provided
No
Replace F1
41285901TH Rev.3
Yes
Yes
Pin 95 of CPU becomes
"L" when the document is
fed to PC2
No
Check CN14 or
Replace PC2.
Yes
Pins 26, 27, 28, 29 of IC2
does not change from "H".
No
No
Waveform of pins 22
and 23 of IC2 are similar
to Figure 3.1-5
No
Replace IC2
Pin 94 of CPU becomes
"L" when the document is
inserted to PC1
No
Pin 12 of IC23 becomes
"L" when the document is
inserted to PC1
No
Yes
Check CN14 or
Replace PC1
Yes
Yes
Output voltage does not
No
appear to pin 1, 10, 6,
and 5 of IC27
No
Check CN8
Yes
Yes
Replace IC23
Replace CPU
or IC2
Replace IC2
Yes
Replace TR7, 8, 9,
10 or IC27
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