Sensors

S2

By-pass Paper End Sensor

L

CN523/5

Open

Paper is detected on the by-pass tray when no paper is set.

Shorted

Paper is not detected on the by-pass tray when paper is set.

S3

By-pass Paper Size Sensor

L

CN523/2

Open

A4/LT size is not detected.

Shorted

A4/LT size is detected.

S4

Duplex Entrance Sensor

L

CN523/14

Open

Jam Z (Jam 26)

Shorted

Jam Z (Jam66)

S5

Fusing Entrance Sensor

L

CN523/20

Open

Jam B (Jam 18)

Shorted

Jam C

S6

Duplex Exit Sensor

L

CN523/23

Open

Jam Z (Jam 25)

Shorted

Jam Z

S7

Fusing Exit Sensor

L

CN525/8

Open

Jam C (Jam 19)

Shorted

Jam C

S8

Fusing Thermopile

A

CN525/6

Open

SC541

Shorted

S9

TD Sensor (Mu () Sensor) (K)

A

CN539/8

Open

Shorted

S10

TD Sensor (Mu () Sensor) (C)

A

CN540/8

Open

Shorted

S11

TD Sensor (Mu () Sensor) (M)

A

CN540/16

Open

Shorted

S12

TD Sensor (Mu () Sensor) (Y)

A

CN540/22

Open

Shorted

S13

ID Sensor

A

CN555/6,7,10,11

Open

SC370

Shorted

S14

ITB Contact HP Sensor

L

CN543/12

Open

SC442

Shorted

S15

Tray Paper End Sensor

L

CN559/12

Open

Paper end is detected when there 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

S27

Paper Exit Sensor

L

CN525/11

Open

Jam C (Jam 20)

Shorted

Jam C (Jam 60)

TH1

Pressure Roller Thermistor (Edge:Rear)

A

CN525/23

Open

SC571

Shorted

TH2

Pressure Roller Thermistor (Center)

A

CN525/21

Open

SC561

Shorted

TH3

Pressure Roller Thermistor (Edge:Front)

A

CN525/25

Open

SC591

Shorted

TH4

Image Creation Temperature Sensor

A

CN526/4

Open

SC497

Shorted

TH5

Fusing Thermistor (NC sensor)

A

CN525/27

Open

SC581

Shorted

SW4

Right Cover Switch

L

CN559/19

Open

“Cover closed” cannot be detected.

Shorted

“Open Cover” cannot be detected.

SW5

Tray Set Switch

L

CN543/15

Open

Paper tray cannot be detected.

Shorted

Paper tray is detected when the paper tray is not set.

SW6

Waste Toner Bottle Set Switch

L

CN535/1

Open

Waste toner bottle cannot be detected.

Shorted

Waste toner bottle is detected when the waste toner bottle is not set.