Misfeed At Duplex Pre-Registration Section - Konica Minolta bizhub C650 Service Manual

15. Jam display
15.3.7

Misfeed at duplex pre-registration section

A. Detection timing
Type
Detection of
misfeed at duplex
pre-registration
section
Duplex pre-regis-
tration section loop
registration revers-
ing jam detection
Duplex pre-regis-
4
tration section
image write start
signal permit wait-
ing jam
B. Action
ADU transport motor/1 (M31)
ADU transport motor/2 (M32)
Timing roller sensor (PS38)
OHP detection sensor (PS40)
Step
1 Initial check items
2 PS38 I/O check, sensor check
3 PS40 I/O check, sensor check
4 M32 operation check
5 M31 operation check
6 Change PFTDB
7 Change PRCB
590
4
• The timing roller sensor (PS38) is not unblocked even after the lapse of a given
period of time after a duplex paper feed sequence has been started.
• The OHP detection sensor (PS40) is not turned ON 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, the image write start sig-
nal permit continues to be disabled for a predetermined period of time after the
timing of the image write start signal output.
Relevant parts
Action
Field Service Ver. 8.0 Jun. 2008
Description
Paper feed/transport drive board (PFTDB)
Printer control board (PRCB)
WIRING DIAGRAM
Control signal
—
PRCB CN36PRCB-6 (ON)
PRCB CN36PRCB -2 (ON)
PFTDB CN17PFTDB-10 to 13
PFTDB CN17PFTDB-14 to 17
—
—
Location (Electri-
cal component)
—
K-4
K-4 to 5
P-8
P-9
—
—