Konica-Minolta bizhub 454e

Misfeed at manual bypass feed section

Detection timing

10-01	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 manual bypass starts to feed paper.
10-02	For paper fed from the manual bypass, loop forming has not been complete before a sheet enters the registration roller because the rise timing of load to perform registration is earlier than the rise timing of load to form a loop.
10-40	For paper fed from the manual bypass, 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.
-	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 manual bypass feed section.

Relevant parts

• Paper feed motor (M22)
• Registration motor (M24)
• Bypass paper feed clutch (CL7)
• Bypass pick-up solenoid (SD1)
• Registration sensor (PS1)
• 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	CL7 operation check	PRCB CN27-8 (ON)	3-C
4	SD1 operation check	PRCB CN27-10 (ON)	4-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