Kyocera FS-1900 - 4000 - Laser Scanner Unit (Polygon Motor) Error

6-15
FS-1900
Ye s
Ye s
Ye s
No
No
No
No
Does
pin #31 (POLON*) of
YC206 on engine board
(KP-864) goes high and
then low?
Does
pin #1 (POLCLK) of
YC206 on engine board
(KP-864) output
square-wave*
1
signal?
Call service
4000:01234546
*
1
: 2.7165 KHz
Print status page.
Print status page.
Print status page.
Remove and check
harness between
engine board (KP-864)
and laser scanner unit.
Turn power switch off.
Turn power switch on.
+24 V DC
at #33 pin of YC206
on engine board
(KP-864) ?
Ye s
Ye s
No
Replace harness between
engine board (KP-864)
and laser scanner unit.
OK?
Replace engine board
(KP-864). See page 5-22.
Replace engine board
(KP-864). See page 5-22.
Replace laser scanner
unit. See page 5-37.
Does pin
#30 (POLRDY*)
of YC206 on engine board
goes low, after pin #31
(POLON*) of YC206
goes low?
NOTE:
Pins of YC206 connector are
crowded and tiny. When if
measuring signal, contact
measurement probe with pins of
YC206 connector accurately.
NOTE:
When If not solved this flow chart,
try to replace below items.
Harness (S02404) scanner unit
and engine board (KP-864)
Engine board (KP-864) and scanner
unit (replace at the same time)
Meaning Suggested causes Corrective action
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).
Defective gate array U204 on the engine board.
Defective polygon motor.
Improper connector insertion.
Defective harness between laser scanner unit
and engine board.
Follow the flow chart
below.
(10) 4000 - Laser scanner unit (Polygon motor) error