Fine Adj Of Dadf Image Magnifictn: Front; White Level Adj - Canon H1 Service Manual

5
Adjustment > Adjustment Method (DADF) > White level adj

Fine adj of DADF image magnifictn: front

1) Place the Test Chart in the ADF, and make a copy. Refer to the output as copy A.
2) Compare Test Chart and copy A in terms of the length of the image in feed direction; as
necessary, make adjustments in service mode.
3) From the Service Mode screen, touch the following notations to bring up the Adjustment
screen:
(LV.1) FEEDER > ADJUST
4) Press [LA-SPEED] to highlight.
• if the image of copy A is shorter, decrease the setting (so that the speed at which
originals are moved in stream reading mode will be reduced).
• if the image of copy A is longer, increase the setting so that the speed at which
originals are moved in stream reading mode will be increased).
unit of adjustments: 0.1%
< If the image of print A is longer >
Trailing edge of
Test Chart
Trailing edge of
print A
A
Feed direction
5 Adjustment > Adjustment Method (DADF) > White level adj
< If the image of print A is shorter >
Trailing edge of
print A
Trailing edge of
Test Chart
A
Feed direction
F-5-16

White level adj

NOTE:
This is a item of adjustment in which the white level of images made in stream reading
mode are matched with the white level of images made in copyboard cover mode. If
you omit this adjustment, the following will likely occur:
• inappropriate reproduction of background density in images made in stream reading
mode
• wrong speck detection in stream reading mode
NOTE:
This system incorporates a 4-line CCD sensor which is used for two types of white
level adjustments: a monochromic adjustment and a color adjustment. "DF-WLVL1"
and "DF-WLVL2" are for the monochromic adjustment, and "DF-WLVL3" and "DF-
WLVL4" are for the color adjustment.
1) Touch the following notations in sequence to bring up the Adjustment screen:
(LV.1) COPIER > FUNCTION > CCD
2) Place paper (of the type most often used by the user) on the copyboard glass, and close
the DADF.
3) Press [DF-WLVL1] to highlight.
4) Press [OK].
Automatic adjustment starts; if it ends successfully, the screen shows [OK!].
5) Remove the paper from the copyboard glass, and place it on the original tray of the
DADF.
6) Press [DF-WLVL2] on the touch panel to highlight.
7) Press [OK].
- The machine executes auto adjustment (duplex stream reading).
- When the adjustment ends normally, the machine indicates 'OK!' on the screen.
8) If the monochromic adjustment fails, perform steps 2) to 7) again.
9) Place paper (of the type most often used by the user) on the copyboard glass, and close
the DADF.
10) Press [DF-WLVL3] to highlight.
11) Press [OK].
Automatic adjustment starts; if it ends successfully, the screen shows [OK!].
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