Konica Minolta magicolor 7450, Руководство по обслуживанию

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Field Service Ver. 1.0 May 2006 13. Jam Display
179
magicolor 7450
T
roubleshooting
13.4 Solution
13.4.1 Initial Check Items
• When a paper misfeed occurs, first make checks of the following initial check items
13.4.2 Misfeed at Fusing/Exit section
A. Detection Timing
B. Action
Check Item Action
Does paper meet product specifications? Change paper.
Is paper curled, wavy, or damp.
Change paper.
Instruct user in correct paper storage.
Is a foreign object present along the paper path, or is the
paper path deformed or worn?
Clean or change the paper path.
Are the Paper Separator Fingers dirty, deformed, or
worn? Clean or change the defective Paper Separa-
tor Finger.
Are rolls/rollers dirty, deformed, or worn? Clean or change the defective roll/roller.
Are the Edge Guide and Trailing Edge Stop at correct
position to accommodate paper?
Set as necessary.
Are actuators found operational as checked for correct
operation?
Correct or change the defective actuator.
Type Description
Detection of
misfeed at Fusing/
Exit Section
PC2 is not unblocked even after the lapse of a given period of time after the paper
has blocked the Exit Sensor (PC2).
The Duplex Unit Transport Sensor 1 (PC1) is not blocked even after the lapse of a
given period of time after the Exit Sensor (PC2) has been unblocked by the paper
during a switchback sequence.
Detection of paper
left in Exit Section Exit Sensor (PC2) 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.
Relevant Electrical Parts
Exit Sensor (PC2)
Duplex Unit Transport Sensor 1 (PC1) Duplex Control Board (PWB-A)
Mechanical Control Board (PWB-M)
Step Action
WIRING DIAGRAM
Control Signal
Location (Electri-
cal Component)
1 Initial check items — —
2 PC2 I/O check, Sensor check PWB-M CNTH2-8 (ON) C-14
3 PC1 I/O check, Sensor check —
4 Change PWB-A — —
5 Change PWB-M — —