Konica-Minolta bizhub C450

Detection timing

Type	Description
2nd Image Transfer, Fusing misfeed detection	The leading edge of the paper does not block the Exit Sensor (PC30) even after the lapse of a given period of time after the Registration Roller Clutch has been energized.
	The Registration Roller Sensor (PC28) is not unblocked even after the lapse of a given period of time after it has been blocked by the paper. (Except when feeding the paper from Tray 1)
Tray 1 take-up misfeed detection	The leading edge of the paper does not block the Registration Roller Sensor (PC28) even after the lapse of a given period of time after the Tray 1 Paper Feed Clutch (CL1) has been energized. (When the system speed is 60 mm/s or 165 mm/s)
	The leading edge of the paper does not block the OHP Sensor (PC27) after the lapse of a given period of time after the Tray 1 Paper Feed Clutch (CL1) has been energized. (When the system speed is 215 mm/s)
Misfeed detected as a result of delayed deactivation of sensor	The Registration Roller Sensor (PC28) is not unblocked even after the lapse of a given period of time after it has been blocked by the paper. (When the system speed is 60/mms or 165 mm/s)
	The OHP sensor (PC27) is not unblocked even after the lapse of a given period of time after PC27 has been blocked by the paper. (When the system speed is 215 mm/s)
Detection of paper left in 2nd Image Transfer	The Registration Roller Sensor (PC28) 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 (PC27) 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.
Detection of paper left in Tray 1	Tray 1 Double Feed 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.

Relevant electrical parts

Tray 1 Double Feed Sensor (PC1)
Registration Roller Sensor (PC28)
Exit Sensor (PC30)
OHP Sensor (PC27)

Control Board (PWB-MC)
Registration Roller Clutch (CL3)
Tray 1 Paper Feed Clutch (CL1)

Action

Step	Action	Control signal	Location
1	Initial check items.
2	PC1 I/O check, Sensor check	PWB-MC PJ22MC-8 (ON)	C to D-5
3	PC28 I/O check, Sensor check	PWB-MC PJ24MC-6 (ON)	C to D-3
4	PC30 I/O check, Sensor check	PWB-MC PJ24MC-12 (ON)	C to D-4
5	PC27 I/O check, Sensor check	PWB-MC PJ24MC-2 (ON)	C to D-3
6	CL3 operation check	PWB-MC PJ24MC-14 (ON)	C to D-4
7	CL1 operation check	PWB-MC PJ14MC-3 (ON)	C to D-5 to 6
8	Change PWB-MC