Canon Color iR C3480, Service Manual

Page: 312 / 774

Chapter 8
8-30
F-8-25
8.7.2 Control of Registration Unit
0014-2910
Color iR C3380G / Color iR C2880G / Color iR C3380i / Color iR C3380 / Color iR C2880i / Color iR C2880 / iR C3480 / iR C3480i / iR C3080 / iR C3080i / iR
C2550
In this machine, it is controlled to turn OFF the pickup motor (in case of cassette pickup), manual feeder pickup clutch (in case of manual feeder pickup), and the
duplexing feeding motor (in case of duplexing re-pickup) to make papers stop at the point where the distance from the pre-registration sensor to the registration
roller (19.9 mm) + predetermined registration arching (cassette/duplexing: 3 mm, manual feed: 5.5 mm) are added after the pre-registration sensor detects the lead-
ing edge.
When executing the accelerated pickup (300 mm/sec), decelerate to 200 mm/sec when the pre-registration sensor turns ON.
When the registration clutch turns ON, the registration roller starts to rotate and feeds paper to the secondary transfer assembly.
The registration clutch is turned OFF either after a paper is fed the predetermined amount (paper 50ms) or when the next paper turns ON the pre-registration
sensor.
8.7.3 Checking Horizontal Registration
0014-0325
Color iR C3380G / Color iR C2880G / Color iR C3380i / Color iR C3380 / Color iR C2880i / Color iR C2880 / iR C3480 / iR C3480i / iR C3080 / iR C3080i / iR
C2550
The machine does not have the horizontal registration adjustment function by the horizontal registration detection at the time of duplexing feeding.
However, practically, adjustment of the horizontal registration point is possible by adjusting the write start timing of the horizontal scanning of the laser (horizontal
scanning interval signal) in terms of software in the service mode setting.
In the service mode, set the horizontal registration adjustment value for each source of paper. The range of adjustment value is +/-2.5 mm. In case of duplexing re-
pickup, the write start timing of the horizontal scanning of the laser is corrected in accordance with the horizontal registration adjustment value of the source of
paper.
Service Mode:
COPIER>ADJUST>FEED-ADJ>ADJ-REFE
Use it to adjust the horizontal registration for the 2nd side of small-size double-sided prints.
COPIER>ADJUST>FEED-ADJ>ADJ-RE-L
Use it to adjust the horizontal registration for the 2nd side of large-size double-sided prints.
COPIER>ADJUST>FEED-ADJ>LOOPREFE
Use it to adjust the degree of arching for the 2nd side of double-sided prints.
The term "2nd side of a double-sided print" as used in relation to the machine's service mode refers to the side that receives an image second in order; in other words,
it corresponds to the 1st side of the original.
Reference:
Small paper: a paper whose length of paper feeding direction is LTR (216 mm) or shorter, e.g., A4 and B5.
Large paper: a paper whose length of paper feeding direction is longer than LTR (261 mm), e.g., A3, A4R, and B5R.
M6
J313 J314
CL6
DC controller PCB
Registr
ation m
ulti motor dr
iv
e signal
Registr
ation clutch dr
iv
e signal