Printed Image Data Ng - Oki OKIFAX4550 Maintenance Manual

4.2.6 Printed image data NG

6: Printed image data NG
Printed image is All black
or all white
No
Positive after-image
provided
Head interface failure
including sector missing
Waveforms of pins 202
through 207 of IC2 are
similar to waveforms in
Figures H.5(5/6, 6/6)
Yes
Check CN14.
41309401TH Rev.4
Yes
Yes
Waveforms are similar
to Figure H.5(1/6) are
input to pins 89(DBPWN)
of IC2 during printing
No
Replace IC2.
No
IC2 : 207 (HLATCH)
: 202 (HCLK)
: 203-206 (HDATA)
No
No
Replace IC2.
Yes
Waveforms of pin
100(CB1PWN) of IC2
are identical
Yes
Waveforms of pin
99(CB2PWN) of IC2
are identical
Yes
Check CN8.
Replace IC2.
Signals of pins 86, 87, 88
of IC2 are similar to
Figures H.5(2/6, 3/6, 4/6)
during printing
Yes
Signals of pins 93, 95 of IC2
change between 0V and 5V
cyclically during printing
Yes
No
No
Replace IC2.
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