Kyocera FS-920 - Page 48

2GL/2FV/2FW
1-5-6
4200
(E3)
PD (Pin photo diode) sensor (laser
scanner unit) error
• The first BD input is not given for 10
seconds after power is turned on and
the laser begins emitting.
• The first BD input is not given for 7
seconds 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
No
No
No
No
No
OK?
OK?
End.
End.
Start
(A)
(B)
Yes
Yes
Yes
Yes
Yes
Turn power switch on.
Turn power switch on.
*
1
:16 ppm GDI printer
*
2
:16/18 ppm printers
Connect oscilloscope to
pin 3 (OUTPEN) of
YC4*
1
/YC6*
2
connector
on the main PWB.
Connect oscilloscope to
pin 3 (OUTPEN) and pin
7 ( ) of YC4*
1
/YC6*
2
connector on the main
PWB.
Turn power switch off,
then on.
Turn power switch off,
then on.
Replace main PWB.
See page 1-6-15 or 16.
Replace main PWB.
See page 1-6-15 or 16.
Replace engine/high
voltage PWB.
See page 1-6-17.
Replace harness between
main PWB and engine/high
voltage PWB.
Continued to
next page.
Continued to
next page.
*
3
Pin photo diode sensor detect
horizontal synchronization signal
(Frequency: 1417 Hz, Low level
width: 10
µs)
5 V DC
at pin 5 of
YC4*
1
/YC6*
2
connector
on the main PWB?
Does pin
3 (OUTPEN) of
YC4*
1
/YC6*
2
connector
on the main PWB goes high,
then before "4200"
error?
Does pin 7
(PDN) of
YC4*
1
/YC6*
2
connector
on the main PWB
output pulse
signal
*
3
, within 0.1 second after
pin 3 (OUTPEN) goes
high, then low?