Electrical Component Defects
519
No. Sensor Name/
Sensor Board Name
Active CN No./
Pin No.
Condition Symptom
is paper in the paper tray.
Shorted Paper end is not detected when
there is no paper in the paper tray.
S16 Paper Feed Sensor L CN559/14 Open Jam A
Shorted Normal operation
S17 ADF Set Sensor L CN403/2 Open ADF open cannot be detected.
Shorted
S19 Registration Sensor L CN559/17 Open Jam A (Jam 17)
Shorted Jam B
S20 Scanner HP Sensor H CN403/5 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 Toner End Sensor (C) A CN539/16 Open SC374
Shorted
S23 Toner End Sensor (M) A CN539/15 Open SC373
Shorted
S24 Toner End Sensor (Y) A CN539/14 Open SC375
Shorted
S25 Waste Toner Full Sensor H CN543/4 Open Waste toner full is detected 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 H CN543/7 Open SC501
Shorted
S27
Paper Exit Sensor L CN525/11 Open Jam C (Jam 20)
Shorted Jam C (Jam 60)
S28 ADF Feed Sensor L CN404/3 Open Jam P
Shorted
S29 Top Cover Set Sensor L CN404/24 Open Top cover open cannot be
detected.
Shorted
S30 Original Set Sensor L CN404/26 Open Original set cannot be detected.
Shorted
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