Konica-Minolta bizhub 454e

Misfeed at tray 2 feed section

Detection timing

12-01	The leading edge of the paper does not turn ON the tray 2 vertical transport sensor (PS19) even after the lapse of a given period of time after the tray 2 starts to feed paper.
12-40	For paper fed from the tray 2, 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 2 vertical transport sensor (PS19) 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 2 paper feed sensor (PS20) 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 2 feed section.

Relevant parts

• Paper feed motor (M22)
• Tray 2 vertical transport motor (M23)
• Tray 2 paper feed clutch (CL1)
• Tray 2 vertical transport sensor (PS19)
• Tray 2 paper feed sensor (PS20)
• Expansion control board (EXCB)
• Printer control board (PRCB)

Step	Action	Control signal	Location
1	Initial check items
2	PS19 I/O check, sensor check	PRCB CN19-5 (ON)	9-C
3	PS20 I/O check, sensor check	PRCB CN19-2 (ON)	9-C
4	CL1 operation check	PRCB CN19-14 (ON)	10-C
5	M22 operation check	EXCB CN3-5 to 8	22-P
6	M23 operation check	EXCB CN3-9 to 12	22-P
7	EXCB IC4, IC5 conduction check
8	Replace EXCB
9	PRCB ICP4 conduction check
10	Replace PRCB