1. "Service Mode Menu screen"
Press [01 Machine Adjustment].
2. "Machine Adjustment Menu screen"
Press [03 Quality Adjustment].
3. "Quality Adjustment Menu screen"
Press [01 Printer Gamma Adjustment].
4. "Printer Gamma Adjustment screen"
Press [01 Printer Gamma Offset Adj].
5. "Printer Gamma Offset Adj. screen"
Press [Next] or [Previous] to select the screen you want to adjust.
Note
• Line1, Line2, Dot1, Dot2, and Stochastic correspond to the screen names in user mode.
• Contone is a screen used in the character section of Line1, Line2, Dot1, and Dot2.
• Contone does not require the adjustment.
6. Press [Print Mode].
7. Set the A4 or 8 1/2 x 11 paper. Press the Start key to output the test pattern.
8. Check the printed test pattern.
• Make sure that the high light density starting section of C and K is uniform, and even between the gray reference lines [1].
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Y
K
C
M
[1]
9. If they are not even, press [Exit PrintMode].
10. "Printer Gamma Offset Adj. screen"
Press the button of a color (C or K) to adjust, enter a value through the numeric button and press [SET].
Setting range: -128 (light) to +127 (dark)
11. Repeat steps 6 to 10 until the standard value can be obtained.
bizhub PRESS C7000/C7000P/C70hc/C6000/PRO C6000L I ADJUSTMENT/SETTING > 5. SERVICE MODE
I -26
12. Take notice of the gray gradation pattern [1] created in C, M and Y, make sure that the gray balance at the square marks line [2] and [3] is
the same.
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Y
K
C
M
[1]
[6] [5] [4] [2] [3]
13. If the gray balance is not the same, press the color (Y or M) to adjust, enter a value through the numeric buttons and press [SET].
Setting range: -128 (light) to +127 (dark)
• How to match the gray balance
Take notice of the gray block [4] made up of 49 patches created in C, M and Y.
In the 49 patches, M gets darker toward right, and Y gets darker downward. C remains unchanged.
The patch [5] at the center is the same color as the gray [2]. The patches [6] positioned at the 4 corners of the patch [5] is the same
color as the gray [3].
Out of the 49 patches, select a gray of the same gray balance as the gray [6].
Example:
• When a patch on the lower right side is more suitable than the patch [5] at the center: Adjust M and Y in the darker direction.
• When a patch on the upper left side is more suitable than the patch [5] at the center: Adjust M and Y in the lighter direction.
14. Press [Print Mode].
15. Set the A4 or 8 1/2 x 11 paper. Press the Start key to output the test pattern.
16. Repeat the steps 13 to 15 until an appropriate value is obtained.