Konica-Minolta bizhub 7718

Detection timing

Type	Description
Paper image transfer section misfeed detection	• The exit sensor (PS5) is not blocked even after the lapse of a given period of time after the paper has unblocked the registration sensor (PS1). • The registration sensor (PS1) is not blocked even after the lapse of a given period of time after the paper has unblocked the PS1. • The registration sensor (PS1) is blocked before the lapse of a given period of time after the paper has unblocked the PS1. • While the main motor (M1) is rotating, the machine cannot detect that the paper continuously unblocks the registration sensor (PS1) for the given period of time
Size error detection	• When the registration sensor (PS1) detects the paper length in the sub scanning direction, the difference between the detected paper length and the paper length specified on the control panel is ± 260 mm or more.
Detection of paper left in image transfer section	• The registration sensor (PS1) is unblocked at timing when the power switch is turned ON, the cover is opened and closed, or a paper misfeed or malfunction is reset.

Relevant electrical components

Registration sensor (PS1)
Exit sensor (PS5)
Registration clutch (CL1)

Main motor (M1)
Printer control board (PRCB)

Action

Step	Operations	Control signal	Location
1	Initial check items
2	Check the connector between M1-PRCB CN6 for proper connection and correct as necessary.
3	Check the M1 connector for proper drive coupling and correct as necessary.
4	Check the connector between PS1-relay CN24-PRCB CN9 for proper connection and correct as necessary.
5	Check the connector between PS5-PRCB CN4 for proper connection and correct as necessary.
6	Check the connector between CL1-relay CN7-PRCB CN9 for proper connection and correct as necessary.
7	PS1 sensor check	PRCB CN9-7 (ON)	C-11
8	PS5 sensor check	PRCB CN4-4 (ON)	E-3
9	CL1 operation check	PRCB CN9-2(REM)	C-11
10	M1 operation check	PRCB CN6-7 (LOCK)	D-9
11	Replace PRCB.