Konica-Minolta bizhub 454e

Misfeed at tray 1 feed section

Detection timing

11-01	The leading edge of the paper does not unblocked the registration sensor (PS1) even after the lapse of a given period of time after the tray 1 starts to feed paper
11-02	For paper fed from the tray1, due to a delay in paper arrival, loop forming in front of the registration roller is not complete before the rise timing of the registration motor (M24).
11-40	For paper fed from the tray1, the image write start signal permit continues to be disabled for a predetermined period of time after the timing of the image write start signal output.
-	Tray 1 paper feed sensor (PS23) 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.
-	In case paper position is detected as locating properly after main power switch is turned ON, door and cover are opened / closed or jam/trouble reset is done, it is regarded as paper jam at tray 1 feed section.

Relevant parts

• Paper feed motor (M22)
• Registration motor (M24)
• Tray 1 paper feed clutch (CL3)
• Registration sensor (PS1)
• Tray 1 paper feed sensor (PS23)
• Front side board (FRB)
• Expansion control board (EXCB)
• Printer control board (PRCB)

Step	Action	Control signal	Location
1	Initial check items
2	PS1 I/O check, sensor check	FRB CN8-3 (ON)	3-L
3	PS23 I/O check, sensor check	PRCB CN26-10 (ON)	8-C
4	CL3 operation check	PRCB CN26-8 (ON)	8-C
5	M22 operation check	EXCB CN3-5 to 8	22-P
6	M24 operation check	EXCB CN3-1 to 4	21-P
7	Replace FRB
8	EXCB IC4, IC5 conduction check
9	Replace EXCB
10	PRCB ICP5 conduction check
11	Replace PRCB