6-24
FS-1900
(3) False “Close left cover”
(4) Defective waste toner box detecting
False "Close
left cover"
Measure voltage #6, #7
and #8 pins of YC203 on
engine board (KP-864).
Ye s
No
Replace engine board
(KP-864). See page 5-22.
Replace sensor board
(KP-754). See page 5-26.
When
Side cover
close scurely, Do pins
#5, #6 and #7 voltage
change 0 to 24 V
DC?
Problem Suggested causes Corrective action
Although new waste
toner box is
installed, Check
waste toner
box is displayed.
Although waste toner
bottle is not installed,
Ready is displayed.
Defective waste toner full sensor [board] (KP-
766) or waste toner sensor (receiver).
Deformed pins of connector (YC702) on the
sensor board (KP-574).
Defective engine board (KP-864).
Replace drum unit. See
page 5-12.
Check and straighten pins
of connector (YC702) on
the sensor board (KP-
574).
Replace engine board
(KP-864).
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