Konica-Minolta bizhub C550

Detection timing

Type	Description
Detection of misfeed at tray 1 feed section	• The leading edge of the paper does not turn ON the tray1 vertical transport sensor (PS4) even after the lapse of a given period of time after the tray1 starts to feed paper.
Detection of paper left in tray 1 feed section	• The tray1 vertical transport sensor (PS4) is turned ON when the main power switch is turned ON, a door or cover is opened and closed, or a misfeed or malfunction is reset.
Tray 1 feed section loop registration reversing jam	• For paper fed from the tray1, due to a delay in paper arrival, loop forming in front of the timing roller is not complete before the rise timing of the registration motor.
Tray 1 feed section TOD permit waiting jam	• For paper fed from the tray1, TOD permit continues to be disabled for a predetermined period of time after the timing of TOD output.

Relevant electrical parts

Take-up motor (M22)
Tray 1 paper feed clutch (CL1)
Tray1 vertical transport sensor (PS4)

Paper feed/transport drive board (PFTDB)
Printer control board (PRCB)

Action

Step	Action	Control signal	Location
1	Initial check items.
2	PS4 I/O check, sensor check	PFTDB CN4PFTDB-8 (ON)	P-5
3	CL1 operation check	PFTDB CN4PFTDB-14 (ON)	P-5
4	M22 operation check	PFTDB CN5PFTDB-5 to 8	P-3
5	Change PFTDB
6	Change PRCB