Gradation Adjust - Minolta CF2002 Service Manual

(10) Gradation Adjust

This adjustment must be made in the following case:
• Color reproduction performance becomes poor.
• The IU has been replaced.
• The Image Transfer Belt Unit has been replaced.
Adjustment Procedure
1. Call the Tech. Rep. Mode to the screen.
2. Touch "Gradation Adjust."
3. Press the Start key to let the copier produce a test pattern.
4. Place the test pattern produced on the Original Glass.
5. Place ten blank sheets of A3 or 11" × 17" paper on the test pattern and then lower the
Original Cover.
6. Press the Start key (to let the copier start scanning the original).
7. Repeat steps from 2 to 6 twice (a total of three cycles).
8. The Adj. Value and Conv. Value will be displayed for Max and Highlight of each color (C,
M, Y, Bk).
9. Check the Conv. Value according to the following procedure.
• Max 0 ± 100 and Highlight 0 ± 60: It completes the adjustment procedure.
• If neither Max or Highlight falls outside the ranges specified above: Perform steps from 2
to 6.
If a fault is detected, "0" is displayed for all values. In this case, turn OFF and ON the


Power Switch and perform Gradation Adjust once again.
If either Max or Highlight still remains outside the specified ranges, perform PRT Max


Density or PRT Highlight.
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