Other Problems; False "Paper Feed Unit Open; False "Top Cover Open - Kyocera FS-1800 Service Manual

6-1-3 Other problems

(1) False "Paper feed unit Open"

False "Paper
feed unit Open"
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 "Top cover Open"

No
Replace sensor board
(KP-754). See page 5-26.
False
"Top cover open"
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 feed 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.
6-25
No
Replace sensor board
(KP-754). See page 5-26.
FS-1800/1800N | FS-3800/3800N