Magnification Adjustment - Canon F1 Service Manual

5
Adjustments > Adjustment Method > Magnification Adjustment

Magnification Adjustment

Note:
• 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.
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
< If the image of print2 is longer >
Trailing edge of
print 1
Trailing edge of
print 2
A
Feed direction
5) If it is out of standard, make an adjustment in service mode.
Lv. FEEDER > ADJUST >
1 LA-SPEED
T-5-48
If the image of print2 is longer, increase the value (make the stream reading speed faster).
If the image of print2 is shorter, decrease the value (make the stream reading speed
slower).
• Changes per 1 unit: 0.1%
5 Adjustments > Adjustment Method > Magnification Adjustment
< If the image of print2 is shorter >
Trailing edge of
print 2
Trailing edge of
print 1
A
Feed direction
F-5-29
• Adjustment range: -30 to +30
6) Printout a test chart again and check that the image is within the standard.
b. Adjustment for back 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 upside down and make a 2-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
< If the image of print2 is longer >
Trailing edge of
print 1
Trailing edge of
print 2
A
Feed direction
5) If it is out of standard, make an adjustment in service mode.
Lv. FEEDER > ADJUST >
1 LA-SPD2
T-5-49
If the image of print2 is longer, increase the value (make the sub scanning width shorter).
If the image of print2 is shorter, decrease the value (make the sub scanning width longer).
• Changes per 1 unit: 0.1%
• Adjustment range: -30 to +30
6) Printout a test chart again and check that the image is within the standard.
5-21
< If the image of print2 is shorter >
Trailing edge of
print 2
Trailing edge of
print 1
A
Feed direction
F-5-30
5-21