Canon Duplex Color B1, Service Manual

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Adjustment > Overview > Magnification Adjustment
Adjustment > Overview > Magnification Adjustment
b. Adjustment for back side reading
1) Set a test chart on the original pickup tray upside down and make a 2-sided print.
2) Overlap the printed paper with the test chart.
3) Check that the leading edge of the printed image is within the standard.
Standard: A </= 1 mm
Feed direction Feed direction
A A
Leading edge of
printed image
Image leading edge of
test chart
Image leading edge of
test chart
Leading edge of
printed image
< If the image is displaced toward trailing edge > < If the image is displaced toward leading edge >
4) If it is out of standard, make an adjustment in service mode.
Lv. FEEDER > ADJUST >
1 DOCST2
If the image is displaced toward trailing edge, increase the value (image is moved forward).
If the image is displaced toward leading edge, decrease the value (image is moved
backward).
Changes per 1 unit: 0.1 mm
Adjustment range: -50 to +50
5) Printout a test chart again and check that the image is within the standard.
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•
Magnification Adjustment
MEMO:
There are 2 adjustment methods; for front side reading (reader side scanner unit) and for
back side reading (DADF side scanner unit).
Compare the image printed by stream reading and printed by copyboard reading to adjust.
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•
a. Adjustment for front side reading
1) Set a test chart on the copyboard glass of the connected device and make a print. This is
deemed as print1.
2) Set a test chart on the original pickup tray and make a 1-sided print. This is deemed as
print2.
3) Overlap the print2 on the print1.
4) Check that the trailing edge of the image of print2 is within the standard.
Standard: A </= 1 mm
Feed direction Feed direction
A A
Trailing edge of
print 1
Trailing edge of
print 2
Trailing edge of
print 1
Trailing edge of
print 2
< If the image of print 2 is shorter > < If the image of print 2 is longer >