ELECTRICAL COMPONENT DEFECTS
SM 4-27 G104
Trouble-
shooting
4.4 ELECTRICAL COMPONENT DEFECTS
4.4.1 SENSORS
No.
Sensor Name/
Sensor Board Name
Active
CN No./
Pin No.
Condition
Symptom
Open
1
Color Drum Gear
Position Sensor
H CN222/2
Shorted
SC380
Open
2
Black Drum Gear
Position Sensor
H CN222/5
Shorted
SC380
Open
Toner end cannot be detected.
3
Toner End Sensor (K)
Toner End Sensor (M)
Toner End Sensor (C)
Toner End Sensor (Y)
L
CN222/8
CN230/13
CN230/26
CN230/29
Shorted
Toner end is detected even if
the there is enough toner.
Open
4
Transfer Belt Contact
Sensor
H CN222/11
Shorted
SC442
Open
5
Transfer Roller
Contact Sensor
L CN222/14
Shorted
SC452
Open
6
TD Sensor (K)
TD Sensor (M)
TD Sensor (C)
TD Sensor (Y)
A
CN222/20
CN225/4
CN230/4
CN230/20
Shorted
SC368 (K)
SC369 (M)
SC370 (C)
SC371 (Y)
Open
8 Transfer Belt Rotation L CN222/27
Shorted
Automatic line position
adjustment error: Transfer belt
unit speed cannot be detected,
causing the image skew.
Open “Close Front/Left Cover” is
displayed.
10 Front Door Sensor H CN206/1
Shorted The front cover open cannot
be detected.
Open Waste Toner near full is
indicated.
11
Waste Toner Overflow
Sensor
H CN230/10
Shorted Waste toner full cannot be
detected even if the waste
toner bottle is full.
Open “Close Front/Left Cover” is
displayed.
12 Left Cover Sensor H C230/15
Shorted The left cover open cannot be
detected.
Open
13
Temperature/Humidity
Sensor
A
A
CN231/1
CN231/3
Shorted
Printed image is wrong such
as rough image, dirty
background or weak image.
Open
14 Paper Size Sensor L
CN214/17
CN214/15
CN214/14
CN214/13
Shorted
Paper size error
Open Paper jam is not detected even
if there is a paper
15
Fusing Entrance
Sensor
L CN213/6
Shorted Paper jam is detected even if
the there is no paper.
Open Paper jam is not detected even
if there is a paper
16 Duplex Jam Sensor 1 L CN213/1
Shorted Paper jam is detected even if
the there is no paper.
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