Kyocera DISCOVER FS-3830N, Service Manual

Page: 57 / 176

2FP/2FY/2FR
1-5-7
Code Contents
Remarks
Causes Check procedures/corrective measures
Laser scanner unit (Pin photo diode
sensor) error
•
Laser beam detection failed. The pin
photo diode sensor [board] (KP-1075)
does not deliver a horizontal synchronous
signal (PD*).
No laser beam
due to the laser
diode defect
(PD*).
Soiled or defec-
tive pin photo di-
ode sensor.
Defective gate
array U7 of en-
gine board.
Improper connec-
tor insertion.
Defective har-
ness between en-
gine board and
laser scanner unit.
Follow the flow chart below. 4200
Yes
No
Yes
No
No
Print status page.
Turn power switch off.
Turn power switch on.
Print status page.
Remove and check
harness between
engine board (KP-1081)
and laser scanner unit.
+24 V DC
at #1 pin of YC601
on APC board
(KP-1062) ?
Yes
Yes
No
Replace harness between
engine board (KP-1081)
and laser scanner unit.
OK?
START
Replace engine board
(KP-1081). See page 1-6-
20.
Replace engine board
(KP-1081). See page 1-6-
20.
Replace laser scanner
unit. See page 1-6-35.
Does
pin #4 (LASER*) of
YC601 on APC board
(KP-1062) goes high
and then low?
Pin #8 (_PDIN*)
of YC601 on APC board
(KP-1062) output pulse
signal*
1
?
*
1
: Pin photo diode sensor
[board KP-1075] detecting
horizontal synchronization signal
Frequency: 2.7 kHz,
Low level width: 1.4 ms
NOTE:
If the problem is not solved by
this flow chart replace the
following items:
Harness (S03012 ) laser
scanner unit and engine board
(KP-1081)
Engine board (KP-1081) and
laser scanner unit (replace at
the same time)