Canon Laser Class 810, Service Manual

Page: 224 / 322

Chapter 13
13-4
13.4 ADF
13.4.1 Outline
13.4.1.1 Outline
0017-5663
This machine has the following adjustment items. Make the necessary ad-
justments after replacing each part.
T-13-3
13.4.1.2 Preparing a Test Sheet for Adjustment
0017-5664
Preparing a Test Sheet for Adjustment
F-13-6
F-13-7
13.4.2 Adjusting the Electrical System
13.4.2.1 Adjusting the Magnification
0017-5950
1) Create a test chart, load it in the ADF, and make a copy of it. This copy is
called copy A.
2) Compare the longitudinal image length on the test chart with that on copy
A. If required, make an adjustment in the service mode.
(A4-size paper: 277 +/-1mm LTR paper: 59 +/-1mm)
Image on copy A is shorter. -> Increase the value (or reduce the stream read-
ing speed).
Image on copy A is longer. -> Decrease the value (or increase the stream
reading speed).
3) Enter the service mode.
Sequentially press the additional functions key, 2 key, 8 key, and additional
functions key on the operation panel of the host machine.
4) Using the arrow keys on the operation panel, display "#SCAN".
5) Press the OK key.
6) Using the arrow keys on the operation panel, display "#SCAN NUMER-
IC".
7) Press the OK key.
8) Using the arrow keys, select "48".
9) Using the numeric keys, change the value to determine the optimum value.
Next, press the OK key. (Default: 32)
Do not change the adjustment value excessively.
13.4.2.2 Adjusting the Horizontal Registration
0017-5952
1) Load the test chart in the ADF and make a copy of it.
2) Compare the horizontal registration of the chart with that of the copy. If
required, make an adjustment.
The specified horizontal registration is 10mm +/-2mm.
F-13-8
1) Load the test chart in the ADF and make a copy of it.
2) Compare the horizontal registration of the chart with that of the copy. If
required, make an adjustment.
The specified horizontal registration is 10mm +/-2mm.
3) Enter the service mode.
Sequentially press the Additional functions key, 2 key, 8 key, and Additional
functions key on the operation panel of the host machine.
4) Using the arrow keys on the operation panel, display "#SCAN".
5) Press the OK key.
6) Using the arrow keys on the operation panel, display "#SCAN NUMER-
IC".
7) Press the OK key.
8) Using the arrow keys, select "41".
9) Using the numeric keys, change the value to determine the optimum value.
Next, press the OK key. (Default: 35)
If the registration cannot be set to the specified value using software, use
the following procedure:
1) Open the document pickup tray.
2) Remove the document pickup tray lower cover.
3) Loosen the one screw [1] and move the slide guide forward or backward
according to the scale calibrated in mm so that the registration is within
spec.
F-13-9
MEMO:
Making copies with the slide guide shifted 1 mm upward will increase the
right registration (on the upper side of paper) by 1 mm.
13.4.2.3 Adjusting the Horizontal Registration
0017-8993
1) Load the test chart in the ADF and make a copy of it.
2) Compare the horizontal registration of the chart with that of the copy. If
No. Adjustment type Replaced parts
[1] Magnification adjustment Motor/roller
[2] Side registration adjustment -
[3] Leading edge registration
adjustment -
10mm
10mm
10mm
10mm
<Using A4 Paper>
Draw straight lines.
(feeding
direction)
10mm
210mm
297mm
10mm
10mm
10mm
10mm
<Using LTR Paper>
Draw straight lines.
(feeding
direction)
10mm
216mm
279mm
Copy of the test sheet
(feeding
direction)
10±2mm
[1]