Ricoh MPC3500

Sensors

Note: • The CN numbers in the following table are the connector numbers on the IOB.

No.	Sensor Name/ Sensor Board Name	Active	CN	Condition	Symptom
SW5	Tray 1 Set Switch	L	CN209/A9	Open	Tray 1 is not detected when tray 1 is set.
				Shorted	Tray 1 is detected when tray 1 is not set.
S15	By-pass Paper Size Sen­sor	L	CN215/ B16, B17, B19, B20	Open/ Shorted	Paper size error
S11	By-pass Paper Detection Sensor	L	CN215/ A17	Open	Paper on the by-pass tray is not detected when paper is set.
				Shorted	Paper on the by-pass tray is detected when paper is not set.
S12	Fusing Entrance Sensor	L	CN215/B6	Open	Jam C (Jam 18)
				Shorted	Jam C (Jam 1)
S9	Duplex Entrance Sensor	L	CN215/A8	Open	Jam Z (Jam 26/27)
				Shorted	Jam Z (Jam 1)
S10	Duplex Exit Sensor	L	CN215/ A11	Open	Jam Z (Jam 25)
				Shorted	Jam Z (Jam 1)
S48	TD Sensor - K	A	CN219/A7	Open/ Shorted	SC372
S49	TD Sensor - M	A	CN219/ A15	Open/ Shorted	SC373
S50	TD Sensor - C	A	CN219/B7	Open/ Shorted	SC374
S51	TD Sensor - Y	A	CN219/ B15	Open/ Shorted	SC375
S5	Fusing Exit Sensor	L	CN232/13	Open	Jam C (Jam 19)
				Shorted	Jam C (Jam 1)
S18	Waste Toner Sensor	H	CN209/A5	Open	Waste toner near full indi­cated when it is not near full.
				Shorted	Waste toner near full can­not be detected when the waste toner bottle is nearly full.
SW4	Waste Toner Bottle Set Switch	L	CN209/A7	Open	Waste toner bottle is not de­tected when the waste toner bottle is set.
				Shorted	Waste toner bottle is detec­ted when the waste toner bottle is not set.
SW6	Tray 2 Paper Size Switch	L	CN209/ A11, A12, A13, A14	Open/ Shorted	Paper size error
S16	Temperature/ Humidity Sensor	A	CN205/1, 3	Open/ Shorted	SC498 Printed image has some problems such as rough im­age, dirty background, weak image or poor fusing.
S47	Thermopile	A	CN218/3	Open/ Shorted	SC541
TH2	Thermistor - Heating Roller	A	CN217/5	Open/ Shorted	SC551
TH1	Thermistor - Pressure Roller	A	CN217/3	Open/ Shorted	SC561
S4	Paper Exit Sensor	L	CN231/10	Open	Jam C (Jam 20)
				Shorted	Jam C (Jam 1)