Konica Minolta magicolor 7450, Service Manual

Page: 343 / 346

6. Jam Display Field Service Ver. 1.0 May 2006
12
Dup
l
ex
Opt
i
on
T
roubleshooting
6.3.2 Duplex Unit pre-registration section misfeed
A. Detection timing
B. Action
Type Description
Detection of
misfeed at Duplex
pre-registration
section The Registration Roller Sensor (PC1) is not blocked even after the lapse of a
given period of time after the Duplex Paper Take-up sequence started.
Duplex Unit Pre-
registration section
Loop Registration
Reversing JAM
detection Rise timing of load for registration is earlier than the one for making the loop at
front of the Registration Roller at pre-registration take-up.
Relevant electrical parts
Registration Roller Sensor (PC1) Duplex Control Board (PWB-A)
Mechanical Control Board (PWB-M)
Step Action
WIRING DIAGRAM
Control signal
Location
(Electrical
components)
1 Initial check items — —
2 PC1 I/O, sensor check PWB-M CNSEN-3 (ON) C-4
3 PWB-A replacement — —
4 PWB-M replacement — —