Other Problems; False "Close Paper Transfer Unit; False "Close Top Cover - Kyocera FS-1900 Service Manual

6-1-3 Other problems

(1) False "Close paper transfer unit"

False
"Close paper
transfer unit"
Measure voltage #12
pin of YC701 on sensor
board (KP-754).
When
paper feed unit
close scurely, does pin
#12 voltage change
0 to 24 V
DC?
Yes

(2) False "Close top cover"

No
Replace sensor board
(KP-754). See page 5-26.
False "Close
top cover"
Measure logic level #11
pin of YC701 on sensor
board (KP-754).
When
Top cover
close scurely, does pin
#11 goes low
to high?
Yes
Replace engine board
(KP-864). See page 5-22.
Connect circuit tester to
pin #20 of YC203 on
engine board (KP-864).
When
paper transfer unit
close scurely, does pin
#20 voltage change
0 to 24 V
DC?
Yes
Replace engine board
(KP-864). See page 5-22.
No
Replace sensor board
(KP-754). See page 5-26.
6-23
No
Replace sensor board
(KP-754). See page 5-26.
FS-1900