Oki OKIOFFICE84 Maintenance Manual page 462

6: Printed image data NG
Printed image is All black
or all white
No
Positive after-image provided
Waveforms are similar to
Figure 6-1 are input to pins 2, 5,
12 of IC10 during printing
Head interface failure
including sector missing
Waveforms of pins 111
through 113 of IC2 are similar
to waveforms in Figures 6-5, 6
Yes
Check CN12.
Yes
Yes
Yes
No Waveforms of pin 2 and pin
3 are identical when pin 1 of
Replace IC2.
Waveforms of pin 5 and pin
6 are identical when pin 4 of
Waveforms of pin 12 and
pin 11 are identical when pin
No
IC2 : 111 (HLATCH)
: 112 (HCLCK)
: 113 (HDATA)
H - 7
No
No
Replace IC2.
No
IC10 is at 5V
Yes
No
IC10 is at 5V
Yes
No
13 of IC10 is at 5V
Yes
Check CN8. Replace IC10.
Replace IC2.
Signals of pins 25, 29, 30
of IC2 are similar to Figures
6-2, 3, 4 during printing
Yes
Signals of pins 33, 35 of IC2
change between 0V and 5V
cyclically during printing
Yes
40672201TH Rev. 4