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October 9th, 1995
A. OPTICAL ADJUSTMENT (MECHANICAL)
When adjusting the scanner, do the optical adjustments first, then the
electrical adjustments (Appendix B).
A.1. Tools
These adjustments require the following special tools.
1) Oscilloscope
2) Resolution chart (test chart): P/N A0129110
3) Optical adjustment harness (jig harness): P/N G4049002
4) Optical adjustment glass (jig glass): P/N G4049001
A.2. Adjustment items
1) White level adjustment
Temporary adjustment of the CCD read position to where the maximum
image signal from the document is detected by the CCD.
2) MTF (Modulation Transfer Function) adjustment
Adjustment of focus to where the CCD detects the greatest image
signal level.
3) Magnification adjustment
Adjustment of the magnification to where a 400-dpi image is formed on
the CCD.
4) Horizontal scanning starting position adjustment
Adjustment to determine the position at which reading of a document
starts in the horizontal scanning direction.
5) Scan line
Adjustment of the CCD position to get the proper scan line.
6) Final while level adjustment
Adjustment of the image signal level from the CCD. The procedure is
the same as for step 1 (white level adjustment).
APPENDIX A. OPTICAL ADJUSTMENT (MECHANICAL)
A-1
Tools
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