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e-STUDIO5540C/6540C/6550C/5560C/6560C/6570C
SETTING ADJUSTMENT
6 - 31
6.2
Image Quality Adjustment (Copying Function)
6.2.1
Automatic gamma adjustment
When the reproduction of gradation is not appropriate, the gradation reproducibility of all colors Y, M, C
and K can be corrected by performing this automatic gamma adjustment. In case the gradation
reproduction of the image checked is not satisfactory, make this adjustment as described below at parts
replacement.
(1) When unpacking or any of the following parts has been replaced, be sure to make this
adjustment:
• Photoconductive drum
• Developer material
• Laser optical unit
• Transfer belt
• 1st transfer roller
• Drum cleaning blade
• Needle electrode
• Main charger grid
• Image position aligning sensor
• Image quality sensor
• SRAM board (LGC board, SYS board)
(2) When any of the following parts are replaced or adjusted, make a copy and check the image to
determine if adjustment is necessary:
• 2nd transfer roller
Notes:
1. Be sure that this adjustment be made after performing the image adjustment in
4"6.1.3 Performing Image Quality Control" and
P. 6-8"6.1.5 Image Dimensional
Adjustment (General description)".
2. Normally, only the adjustment of color/black integrated pattern is needed. When the
P. 6-41"6.2.11 Beam level conversion setting" is made, color pattern and
black pattern need to be adjusted individually.
<Procedure>
(1) While pressing [0] and [5] simultaneously, turn the power ON.
Adjustment Mode
(2) Select the A4/LT drawer. Key in the pattern number and press the [FAX] button to output a “Patch
chart for gamma adjustment”.
*. e-STUDIO5540C/6540C/6550C only
(3) Place the patch chart for adjustment printed in step (2) face down on the original glass.
Place the chart aligning its side with 2 black squares against the original scale.
Pattern No.
Pattern
Remark
Paper type
4
Color/black integrated
When performing code 05-7869
All paper types
10
Black
When performing code 05-7165*
All paper types
200
Color/black integrated
When performing code 05-7871-0
Plain paper1
202
Color/black integrated
When performing code 05-7871-1
Plain paper2
204
Color/black integrated
When performing code 05-7871-2
Recycled paper
206
Color/black integrated
When performing code 05-7871-3
Thick paper1
208
Color/black integrated
When performing code 05-7871-4
Thick paper2
210
Color/black integrated
When performing code 05-7871-5
Thick paper3
212
Color/black integrated
When performing code 05-7871-6
Thick paper4
214
Color/black integrated
When performing code 05-7871-7
Special paper 1
216
Color/black integrated
When performing code 05-7871-8
Special paper 2
