E2 Laser Scanner Unit (Polygon Motor) Error - Kyocera FS-1800 Service Manual

(14) E2 Laser scanner unit (Polygon motor) error
Meaning
POLRDY* does not
go low within 20
seconds after POLON*
goes low (When
starting) or within 16
seconds after REGPAP
signal goes high
(during printing).
Call service
personE2:01234546
Turn power switch off.
Remove and check
harness between
engine board (KP-864)
and laser scanner unit.
OK?
Yes
Turn power switch on.
+24 V DC
at #33 pin of YC206
on engine board
(KP-864) ?
Print status page.
Does
pin #1 (POLCLK) of
YC206 on engine board
(KP-864) output
square-wave*
signal?
Yes
1
*
FS-1800/1800N | FS-3800/3800N
Suggested causes
• Defective gate array U204 on the engine
board.
• Defective polygon motor.
• Improper connector insertion.
• Defective harness between laser scanner unit
and engine board.
NOTE:
Pins of YC206 connector are
crowded and tiny. When if
measuring signal, contact
measurement probe with pins of
YC206 connector accurately.
No
Replace harness between
engine board (KP-864)
and laser scanner unit.
No
Yes
No
1
Replace engine board
: [FS-1800/1800N]
(KP-864). See page 5-22.
2,298 Hz
[FS-3800/3800N]
2,314.93 Hz
NOTE:
When If not solved this flow chart,
try to replace below items.
6-18
Corrective action
Follow the flow chart
below.
Print status page.
Does
pin #31 (POLON*) of
YC206 on engine board
(KP-864) goes high and
then low?
Yes
Print status page.
Does pin
#30 (POLRDY*)
of YC206 on engine board
goes low, after pin #31
(POLON*) of YC206
goes low?
Yes
Replace engine board
(KP-864). See page 5-22.
Replace laser scanner
unit. See page 5-37.
Harness (S02404) scanner unit
and engine board (KP-864)
Engine board (KP-864) and scanner
unit (replace at the same time)
No
No