Misfeed At 2Nd Image Transfer Section - Konica Minolta bizhub C250 Service Manual

Field Service Ver. 3.0 Aug. 2006
15.3.3

Misfeed at 2nd Image Transfer section

A. Detection Timing
Type
Detection of The leading edge of the paper does not block the Exit Sensor (PC2) even after the
misfeed at 2nd lapse of a given period of time after the Registration Roller Clutch (CL1) has been
Image Transfer energized.
section
The Registration Roller Sensor (PC1) is not unblocked even after the lapse of a
given period of time after it has been blocked by the paper.
Detection of paper The Registration Roller Sensor (PC1) is blocked when the Main Power Switch is
left in 2nd Image turned ON, a door or cover is opened and closed, or a misfeed or malfunction is
Transfer section reset.
The OHP Sensor (PC4) is blocked when the Main Power Switch is turned ON, a
door or cover is opened and closed, or a misfeed or malfunction is reset.
The Exit Sensor (PC2) is blocked when the Image Transfer Belt Unit is being
cleaned.
Misfeed detected Registration Roller Sensor (PC1) does not transmit the paper even after the lapse
as a result of of a given period of time after the paper has blocked PC1 at Tray 1 feed.
delayed deactiva-
tion of sensor
2nd Image Rise timing of load for registration is earlier than the one for making loop at front of
Transfer section the Registration Roller when the sensor at front of the Registration Roller is
Loop Registration blocked at Paper feed.
Reversing JAM
B. Action
Registration Roller Sensor (PC1)
Exit Sensor (PC2)
OHP Sensor (PC4)
Registration Roller Clutch (CL1)
Step
1 Initial check items
2 PC1 I/O check, Sensor check
3 PC2 I/O check, Sensor check
4 PC4 I/O check, Sensor check
5 CL1 operation check
6 Change PWB-M
Relevant Electrical Parts
Action
Description
Mechanical Control Board (PWB-M)
WIRING DIAGRAM
Control Signal
—
PWB-M CNSEN-3 (ON)
PWB-M CNTH2-8 (ON)
PWB-M CNSEN-6 (ON)
PWB-M CNSEN-18 (ON)
—
15. Jam Display
Location (Electri-
cal Component)
—
C-3
C-13
C-3
C-4
—
405