No.
Sensor Name/
Sensor Board Name
Active
CN No./
Pin No.
Condition Symptom
S18 PTR Contact Sensor L CN523/5
Open
• SC452
Shorted
S19 Registration Sensor L CN559/17
Open • Jam A (Jam 17)
Shorted • Jam B
S20 Scanner HP Sensor H CN104/5
Open
SC120, SC121
Shorted
S21
Temperature/
Humidity Sensor
A CN526/6,8
Open • Printed image is
wrong, such as
rough image, dirty
background or
weak image.
•
SC498
Shorted
S22
TD Sensor (C) A CN539/22
Open
• SC374
Shorted
S23 TD Sensor (M) A CN539/23
Open
• SC373
Shorted
S24 TD Sensor (Y) A CN539/24
Open
• SC375
Shorted
S25
Waste Toner
Overflow Sensor
H CN543/4
Open
• Waste toner full
indicated when it is
not near full.
Shorted
• Waste toner full
cannot be detected
when the waste
toner bottle is
nearly full.
S26 Tray Lift Sensor L CN543/7
Open
• SC501
Shorted
6. Troubleshooting
724
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