2G4
1-4-7
4200
PD (Pin photo diode) sensor (laser
scanner unit) error
The first BD input is not given for 10 sec-
onds after power is turned on and the
laser begins emitting.
The first BD input is not given for 7 sec-
onds during printing and after the laser
begins emitting.
Defective main
PWB.
Follow the flow chart.
Defective harness
between main
PWB and engine/
high voltage PWB.
Defective engine/
high voltage PWB.
Code
Contents
Remarks
Causes
Check procedures/corrective measures
(A)
(B)
Start
OK?
OK?
No
No
No
No
Yes
Yes
Yes
No
Yes
Yes
Replace main PWB.
Replace main PWB.
Turn power switch off,then
on.
Replace harness between main
PWB and engine/high voltage
PWB.
Turn power switch on.
Turn power switch on.
Replace engine/high
voltage PWB.
Connect oscilloscope to pin
3 (OUTPEN) of J7
connector on the main
PWB.
*: Pin photo diode sensor detect
horizontal synchronization signal
(Frequency: 1417 Hz, Low level
width: 10
µ
s)
Continued to next page.
Continued to next page.
Turn power switch off,then
on.
Connect oscilloscope to pin
3 (OUTPEN) and pin 7
(PDN) of J7 connector on
the main PWB.
End.
End.
5 V DC at
pin 5 of J7 connector on
the main PWB?
Does pin 7 (PDN)
of J7 connector on the main
PWB output pulse signal*,
within 0.1 second after pin
3 (OUTPEN) goes high,
then low?
Does pin 3 (OUTPEN)
of J7 connector on the main
PWB goes high, then before
"4200" error?
See page P.1-5-29.
See page P.1-5-29.
See page P.1-5-14.
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