Canon GP160, Service Manual

Page: 481 / 797

2-23
CHAPTER 2 STANDARDS AND ADJUSTMENTS
c) Adjusting sub-scanning direction magnification
Determine the difference between a
2
+ a
3
and b
2
+ b
3
in sample A and sample B to
adjust displacement.
1) Press the Register/Set key, then press the # key to enter the service mode.
2) Use the
▲ ▼
shift keys to select #6 SCANNER and press the Set key.
3) Use the
▲ ▼
shift keys to select 8.CCD.
4) Use the
▲ ▼
shift keys to select 016.
The 016 parameter is now displayed.
5) If a
2
+ a
3
> b
2
+ b
3
,
Decrease the 016 parameter value.
If a
2
+ a
3
< b
2
+ b
3
,
Increase the 016 parameter value.
(Use the numeric keys for input.)
An increase (decrease) of 3 in the parameter value yields a displacement of approxi-
mately 1 mm.
Reference:
An increase (decrease) of 1 in the parameter value yields a displacement of approxi-
mately 0.33 mm.
6) Press the Set key.
After the message “Registered” has appeared on the display, the value of parameter
017 is shown.
7) Add (subtract) 1/3 of the value added (subtracted) in step 5) to the 017 parameter
value.
If a
2
+ a
3
> b
2
+ b
3
,
Subtract from the 017 parameter value.
If a
2
+ a
3
< b
2
+ b
3
,
Add to the 017 parameter value.
(Use the numeric keys for input.)
8) Press the Set key.
Example:
When a
2
= 10 mm a
3
= 11 mm b
2
= 12 mm b
3
= 12 mm,
a
2
+ a
3
= 21 b
2
+ b
3
= 24
Since the difference is 3 mm, add 9 to the 016 parameter value and add to the 017
parameter value.