Ricoh Mo-C1, Service Manual, Page: 1040 / 1052

The copier firmware has a test pattern with eight stepped gradation scales for each color
(KCYM), including background white, for Text and Photo modes. The ACC procedure
automatically calibrates the gamma curve when the user selects ACC. Generally, here is
what happens:
• The operator prints the pattern.
• Operator places the pattern on the exposure glass.
• Copier scans 8 lines (1 for each color in text mode and one for each color in photo
mode).
• Machine corrects the printer gamma by comparing the ideal settings with the
current image density.
• Machine combines the corrected gamma curve with the High, Middle, Low ID
values currently in memory.
• Machine calculates the ID max (amplitude and gamma curve) based on data from
the ACC scan. The correct gamma curves can be adjusted with SP4918.
Note: This is done only with machines that support ACC.
The SP codes below display the settings for factory, previous setting, current setting, and
ACC setting.
1 Factory
2 Previous
3 Current
4 ACC
1102 Resolution Setting
This setting matches supported resolution with a dithering mode.
1103 Test Page
1 Color Gray Scale
2 Color Pattern
2. Appendix 2: Service Program Mode
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