Canon iR3570 Series, Service Manual

Page: 315 / 722

Chapter 8
8-29
F-8-40
8.6.2 Checking Horizontal Registration
0007-2214
iR2270 / iR2870 / iR3570 / iR4570 / / / / / iR2230 / / / iR3530 /
The machine does not have a mechanism to check horizontal registration for both 1st and 2nd sides of a print. The point of horizontal registration for the 2nd side
may be adjusted in service mode (i.e., the image write start position).
The degree of arching for registration on the 2nd side of a double-sided print must be adjusted separately from the adjustment for the 1st side to accommodate the
fact that different feed paths are used up to the registration roller for 1st and 2nd sides.
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.
Reference:
small-size: A4, B5, and the like, whose side in paper feed direction is shorter than that of LTR.
Large-size: A3, A4R, B5R, and the like, whose side in feed direction is longer than that of LTR.
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.
8.7 Duplex Feeding Unit
8.7.1 Overview
0007-2218
iR2270 / iR2870 / / / iR2230 / / / iR3530 /
Inside the duplexing assembly are found two sets of rollers that are driven by the main motor (M2) and the duplexing clutch (CL6).
Different sets of rollers are used to turn over the sheet for duplexing depending on whether or not the machine is equipped with a delivery accessory*:
If a delivery accessory is present, the reversing rollers are used to turn over the sheet.
If no delivery accessory is present, the delivery rollers are used to turn over the sheet.
*3 Way Unit-A1
M2
DC controller PCB
J313 J314
CL2