Magnification - Canon DADF-M1 Service Manual

Chapter 4
screws [2].
[1]
F-4-40

4.3.1.9 Magnification

Memo:
To adjust the magnification, compare an image made
in stream reading mode and an image made in
copyboard mode. Unlike other ADFs, you will not be
comparing a copy image and its original.
1) Using A4 or LTR paper, prepare a test chart as
follows:
10mm
Right angle
F-4-41
2) Place the test chart you have prepared on the
copyboard glass, and make a copy. Refer to the output
as copy A.
4-24
[3]
[2]
[1]
0003-2302
10mm
3) Place the test chart in the original pickup tray, and
make a copy at a 100% reproduction ratio. Refer to the
output as copy B.
4) Put copy A and copy B together, and compare the
length of the image in feed direction, making sure that
dimension a is as indicated. If not, go to step 5).
standard: a </= 1 mm
<If Cop A Is Shorter>
Feed
direction
<If Copy A Is Longer>
Feed
direction
F-4-42
5) Start service mode as follows: press the User Mode
key, press the 2 and 8 keys at the same time, and press
the User Mode key once again.
6) Make the
FEEDER>ADJUST>LA-SPEED; then, change the
setting to make adjustments.
-To make the image on copy B longer, decrease the
setting (so that the stream reading speed will be
decreased).
To make the image on copy B shorter, increase the
setting (so that the stream reading speed will be
increased).
[ range -30 to 30 : -3 to + 3 % ]
7) Make a copy of the text charge once again, and
check to see that the image is as indicated.
Copy A
a
Copy B
Copy A
a
Copy B
following selections: