Solution; Initial Check Items; Duplex Unit Pre-Registration Section Misfeed - Konica Minolta bizhub C200 Service Manual

Field Service Ver. 1.0 Jun. 2008
6.3

Solution

6.3.1

Initial check items

• When a paper misfeed occurs, first perform the following initial check items.
Check Item
Does the 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 rolls/rollers dirty, deformed, or worn?
Are the edge guide and trailing edge stop at the cor-
rect position to accommodate the paper?
Are the actuators found operational when checked for
correct operation?
6.3.2

Duplex unit pre-registration section misfeed

A. Detection timing
Type
Detection of misfeed at
Duplex pre-registration
section
Duplex pre-registration
section loop registration
reversing jam detection
Duplex pre-registration
section image write start
signal permit waiting jam
B. Action
Duplex unit transport motor (M2)
Sensor in front of tim. roller (PS1)
Step
1 Initial check items
2 PS1 I/O check, sensor check
3 M2 operation check
4 Change DCB
5 Change PRCB
• The leading edge of the paper does not turn ON the sensor in front of
tim. roller (PS1) even after the lapse of a given period of time after a
duplex paper feed sequence has been started.
• For the second-side feed of paper in the duplex mode, loop forming has
not been complete before the second side of a sheet enters the timing
roller because the rise timing of load to perform registration is earlier
than the rise timing of load to form a loop.
• For the second-side feed of paper in the duplex mode, image write start
signal permit continues to be disabled for a predetermined period of
time after the timing of image write start signal output.
Relevant electrical parts
Action
Action
Change the paper.
Change the paper.
Instruct the user on the correct paper storage
procedures.
Clean or change the paper path.
Clean or change the defective roll/roller.
Set as necessary.
Correct or change the defective actuator.
Description
Duplex unit control board (DCB)
Printer control board (PRCB)
WIRING DIAGRAM
Control signal
—
PRCB CN1-3 (ON)
DCB CN4-1 to 4
—
—
6. Jam display
Location (Electrical
component)
—
bizhub C200
C to D-19
AD-505 F-4
—
—
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