Printed Image Data Ng - Oki OKIFAX4550 Maintenance Manual

4.1.6 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 111
through 113 of IC2 are
similar to waveforms in
Figures H.5(5/6, 6/6)
Yes
Check CN12.
41309401TH Rev.4
Yes
Yes
Waveforms are similar
Yes
to Figure H.5(1/6) are
input to pins 9, 10, 11
of IC22 during printing
No Waveforms of pin 9 and pin
38 are identical when pin 1 of
Replace IC2.
Waveforms of pin 10 and pin
41 are identical when pin 2 of
pin 42 are identical when pin
No
IC2 : 111 (HLATCH)
: 112 (HCLCK)
: 113 (HDATA)
No
No
Replace IC2.
IC22 is at 5V
Yes
IC22 is at 5V
Yes
Waveforms of pin 11 and
3 of IC22 is at 5V
Yes
Check CN8. Replace IC22.
Replace IC2.
Signals of pins 25, 29, 30
of IC2 are similar to
Figures H.5(2/6, 3/6, 4/6)
during printing
Yes
Signals of pins 33, 35 of IC2
change between 0V and 5V
cyclically during printing
Yes
No
No
No
540 /