Sharp SF-2040, Service Manual, Page: 89 / 131

3. Optical System
The optical system must be adjusted according to the following flowchart:
* The exposure balance, blank lamp position and copy ends can be separately adjusted. But items other than these must be adjusted
according to the steps shown in the above flowchart.
YES
NO
YES
NO
YES
NO
YES
NO
Check the following preset values depending on the focal length of lens (lens number):
• Reference position of 4. and 5. mirror Reference position of lens.
• Reference position of 4. and 5. mirror
• Lateral magnification
• Lens characteristics
Focus----- Adjust reference position of 4.
and 5. mirror Magnification
Adjust longitudinal magnification
Adjust lateral magnification
Magnification in focus at reduced (x 0.50) and enlarged (x 2.00) copy
Adjust characteristic values of lens
(irregularity of focal length)
Image distortion, center deviation
Image distortion ---
Correct lateral distortion
Center deviation ---
Position of exposure-balancing blank lamp, irregularity of copy ends
Adjust exposure balance
Adjust blank lamp position
Adjust copy ends (including void area)
End
Simulation 48-01
Simulation 48-01
Simulation 48-02
Simulation 26-09, 26-08
Magnification(lateral and longitudinal) in focus at full-size copy
Focus -----
Correct center deviation
Correct longitudinal distortion
7 – 7