Konica-Minolta bizhub C300

Detection timing

Type	Description
Detection of misfeed at 2nd image transfer section	The leading edge of the paper does not block the exit sensor (PC2) even after the lapse of a given period of time after the registration roller clutch (CL1) has been energized.
	The registration roller sensor (PC1) is not unblocked even after the lapse of a given period of time after it has been blocked by the paper.
Detection of paper left in 2nd image transfer section	The registration roller sensor (PC1) is blocked when the main power switch is turned ON, a door or cover is opened and closed, or a misfeed or malfunction is reset.
	The OHP sensor (PC4) is blocked when the main power switch is turned ON, a door or cover is opened and closed, or a misfeed or malfunction is reset.
	The exit sensor (PC2) is blocked when the image transfer belt unit is being cleaned.
Misfeed detected as a result of delayed deactivation of sensor	Registration roller sensor (PC1) does not transmit the paper even after the lapse of a given period of time after the paper has blocked PC1 at tray 1 feed.
2nd image transfer section loop registration reversing jam	Rise timing of load for registration is earlier than the one for making loop at front of the registration roller when the sensor at front of the registration roller is blocked at paper feed.

Relevant electrical parts

Registration roller sensor (PC1)
Exit sensor (PC2)
OHP sensor (PC4)
Registration roller clutch (CL1)

Mechanical control board (MFPB)

Action

Step	Action	Control signal	Location
1	Initial check items.
2	PC1 I/O check, sensor check	MFPB CNSEN-3 (ON)	C-3
3	PC2 I/O check, sensor check	MFPB CNTH2-8 (ON)	C-13
4	PC4 I/O check, sensor check	MFPB CNSEN-6 (ON)	C-3
5	CL1 operation check	MFPB CNSEN-18 (ON)	C-5
6	Change MFPB