13.4 Solution; Initial Check Items; Misfeed At Fusing/Exit Section - Konica Minolta magicolor 7450 Service Manual

Field Service Ver. 1.0 May 2006

13.4 Solution

13.4.1

Initial Check Items

• When a paper misfeed occurs, first make checks of the following initial check items
Does paper meet product specifications?
Is paper curled, wavy, or damp.
Is a foreign object present along the paper path, or is the
paper path deformed or worn?
Are the Paper Separator Fingers dirty, deformed, or
worn?
Are rolls/rollers dirty, deformed, or worn?
Are the Edge Guide and Trailing Edge Stop at correct
position to accommodate paper?
Are actuators found operational as checked for correct
operation?
13.4.2

Misfeed at Fusing/Exit section

A. Detection Timing
Type
PC2 is not unblocked even after the lapse of a given period of time after the paper
has blocked the Exit Sensor (PC2).
Detection of
misfeed at Fusing/
The Duplex Unit Transport Sensor 1 (PC1) is not blocked even after the lapse of a
Exit Section
given period of time after the Exit Sensor (PC2) has been unblocked by the paper
during a switchback sequence.
Detection of paper Exit Sensor (PC2) is blocked when the Main Power Switch is turned ON, a door or
left in Exit Section cover is opened and closed, or a misfeed or malfunction is reset.
B. Action
Exit Sensor (PC2)
Duplex Unit Transport Sensor 1 (PC1)
Step
1 Initial check items
2 PC2 I/O check, Sensor check
3 PC1 I/O check, Sensor check
4 Change PWB-A
5 Change PWB-M
Check Item
Relevant Electrical Parts
Action
Action
Change paper.
Change paper.
Instruct user in correct paper storage.
Clean or change the paper path.
Clean or change the defective Paper Separa-
tor Finger.
Clean or change the defective roll/roller.
Set as necessary.
Correct or change the defective actuator.
Description
Duplex Control Board (PWB-A)
Mechanical Control Board (PWB-M)
WIRING DIAGRAM
Control Signal
—
PWB-M CNTH2-8 (ON)
—
—
—
13. Jam Display
Location (Electri-
cal Component)
—
C-14
—
—
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