Ricoh D027 MPC4000 AP-C2

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

Sensors

No.	Sensor Name/ Sensor Board Name	Active	CN	Condition	Symptom
SW5	Tray 2 Paper Size Switch	L	CN224/ A11, A12, A13, A15	Open/ Shorted	Paper size error
S6	Temperature/ Humidity Sensor	A	CN231/ 25, 27	Open/ Shorted	SC498 Printed image has some problems such as rough image, dirty background, weak image or poor fusing.
S39	Thermopile	A	CN209/16	Open/ Shorted	SC541
TH2	Thermistor - Heating Roller	A	CN212/22	Open/ Shorted	SC551
TH1	Thermistor - Pressure Roller	A	CN212/18	Open/ Shorted	SC561
S3	Paper Exit Sensor	L	CN204/9	Open	Jam C (Jam 20)
				Shorted	Jam C (Jam 1)
S5	Paper Overflow Sensor	L	CN204/15	Open	Paper overflow message is not displayed when the paper overflow condition still remains.
				Shorted	Paper overflow message is displayed when the paper overflow condition does not remain.
S48	Original Width Sensor 1	A	CN313/14 SIO	Open/ Shorted	Original paper size cannot be detected.
S47	Original Width Sensor 2	A	CN313/11 SIO	Open/ Shorted	Original paper size cannot be detected.
S46	Original Length Sensor 1	A	CN313/8 SIO	Open/ Shorted	Original paper size cannot be detected.
S45	Original Length Sensor 2	A	CN313/5 SIO	Open/ Shorted	Original paper size cannot be detected.
S44	Original Length Sensor 3	A	CN313/2 SIO	Open/ Shorted	Original paper size cannot be detected.
S42	Scanner HP Sensor	H	CN318/2	Open	SC120
			SIO	Shorted	SC121
S43	Platen Cover Sensor	L	CN318/5 SIO	Open/ Shorted	Platen cover open cannot be detected.
-	Paper Transfer Contact Sensor	L	CN208/7	Open/ Shorted	SC452
-	Image Transfer Belt Contact Sensor	L	CN208/2	Open/ Shorted	SC442
S40	Heating Roller Rotation Sensor	H/L	CN210/2	Open/ Shorted	SC584
S41	Pressure Roller HP Sensor	L	CN210/5	Open/ Shorted	SC569
S2	Junction Paper Jam Sensor	L	CN204/6	Open/ Shorted	Jam C (Jam 24/64)