Konica-Minolta bizhub C20

Detection timing

Type	Description
Detection of misfeed at transfer section	The registration sensor (PS4) is not blocked even after the lapse of a given period of time after the paper has unblocked PS4.
	The paper does not block the exit sensor/1 (PS8) even after the lapse of a given period of time after the paper has unblocked the registration sensor (PS4).
	When a sheet of paper is passing through the registration sensor (PS4), the pressure sequence of the 2nd transfer section has not started.
Detection of paper left in transfer section	The registration sensor (PS4) is unblocked when the power switch is turned ON, a door or cover is opened and closed, or a misfeed or malfunction is reset.
	The media loop sensor (PS6) is unblocked when the power switch is turned ON, a door or cover is opened and closed, or a misfeed or malfunction is reset.

Relevant electrical parts

Registration sensor (PS4)
Exit sensor/1 (PS8)
Media loop sensor (PS6)
2nd image transfer pressure/retraction clutch (CL5)

Print control board (PRCB)

Action

Step	Action	Control signal	Location
1	Initial check items.
2	PS4 sensor check	PRCB PJ15-3 (ON)	C to D-5
3	Make the sensor check of exit sensor/1 (PS8) and, if any abnormal condition is found, replace the fuser unit with a new one.
4	PS6 sensor check	PRCB PJ16-3 (ON)	C to D-4
5	CL5 operation check	PRCB PJ10-5 (REM)	C to D-7 to 8
6	Change PRCB.