Electrical Component Defects
Sensors
No.
Sensor Name/
Sensor Board Name
Active
CN No./
Pin No.
Condition Symptom
1
Color Drum Gear
Position Sensor
H CN222/2
Open
SC380
Shorted
2
Black Drum Gear
Position Sensor
H CN222/5
Open
SC380
Shorted
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
Open
Toner end cannot be
detected.
Shorted
Toner end is detected
even if there is enough
toner.
4
Transfer Belt Contact
Sensor
H CN222/11
Open
SC442
Shorted
5
Transfer Roller Contact
Sensor
L CN222/14
Open
SC452
Shorted
6
TD Sensor (K)
TD Sensor (M)
TD Sensor (C)
TD Sensor (Y)
A
CN222/20
CN225/4
CN230/4
CN230/20
Open SC368 (K)
SC369 (M)
SC370 (C)
SC371 (Y)
Shorted
8 Transfer Belt Rotation L CN222/27
Open Automatic line position
adjustment error: Transfer
belt unit speed cannot be
detected, causing image
skew.
Shorted
10 Front Door Sensor H CN206/1
Open
“Close Front/Left Cover”
is displayed.
Electrical Component Defects
131
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