Ricoh C211 Service Manual page 126

3.1.3 Shading Adjustment
\ \
\
[B]
/
Purpose:
~;74
A
The middle of the wavefrom
should be higher than the ends.
B>O.6'
To flatten the white level waveform. This also, corrects for distortion to
the light intensity due to the output characteristics at both lamp ends
and aberrations within the lens section.
1,
2.
30
4.
5.
Close the scanner unit [A].
Press the Print Start key to turn on the fluorescent lamp,
Confirm that the above white level waveform is displayed.
If incorrect, move the shading plate [B] position
vertically (up
or down), so
that the waveform is similar to the one above.
After adjustment, retighten the mounting screws [C] of the shading plate [B].
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