Konica Minolta magicolor 7450, Руководство по обслуживанию

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13. Jam Display Field Service Ver. 1.0 May 2006
180
magicolor 7450
T
roubleshooting
13.4.3 Misfeed at 2nd Image Transfer section
A. Detection Timing
B. Action
Type Description
Detection of
misfeed at 2nd
Image Transfer
section
The leading edge of the paper does not block the Exit Sensor (PC2) even after the
lapse of a given period of time after the Registration Roller Clutch (CL1) has been
energized.
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
left in 2nd Image
Transfer section
The Registration Roller Sensor (PC1) 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 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
as a result of
delayed deactiva-
tion of sensor Registration Roller Sensor (PC1) does not transmit the paper even after the lapse
of a given period of time after the paper has blocked PC1 at Tray 1 feed.
2nd Image
Transfer section
Loop Registration
Reversing JAM Rise timing of load for registration is earlier than the one for making loop at front of
the Registration Roller when the sensor at front of the Registration Roller is
blocked at Paper feed.
Relevant Electrical Parts
Registration Roller Sensor (PC1)
Exit Sensor (PC2)
OHP Sensor (PC4)
Registration Roller Clutch (CL1) Mechanical Control Board (PWB-M)
Step Action
WIRING DIAGRAM
Control Signal
Location (Electri-
cal Component)
1 Initial check items — —
2 PC1 I/O check, Sensor check PWB-M CNSEN-3 (ON) C-3 to 4
3 PC2 I/O check, Sensor check PWB-M CNTH2-8 (ON) C-14
4 PC4 I/O check, Sensor check PWB-M CNSEN-6 (ON) C-4
5 CL1 operation check PWB-M CNSEN-18 (ON) C-5
6 Change PWB-M — —