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3.2
Image Quality Adjustment (Copying Function)
3.2.1
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
• Transfer belt
• Needle electrode
• Image quality sensor
(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
"3.1.3 Performing Image Quality Control (ICQ)" and
Adjustment".
2. Normally, only the adjustment of color/black integrated pattern is needed. When the
adjustment of
black pattern need to be adjusted individually.
Code
Item to be adjusted
1642
Automatic gamma
(1643)
adjustment
(580)
<Procedure>
While pressing [0] and [5] simultaneously, turn the power ON. → Adjustment Mode
(1)
(2)
Select the A4/LT drawer. Key in the pattern number and press the [FAX] button to output a "Patch
chart for gamma adjustment".
Pattern No.
Pattern No.
4
Color/black integrated
200
Color/black integrated
204
Color/black integrated
206
Color/black integrated
208
Color/black integrated
210
Color/black integrated
212
Color/black integrated
214
Color/black integrated
216
Color/black integrated
(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.
(4)
Key in a code and press the [START] button.
→ The scanner reads the chart automatically and performs automatic gamma adjustment
calculation (approx.30 sec.).
© 2008 - 2011 TOSHIBA TEC CORPORATION All rights reserved
• Developer material
• 1st transfer roller
• Main charger grid
• SRAM board (LGC board, SYS board)
P.3-39 "3.2.11 Beam level conversion setting" is made, color pattern and
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. The result will be applied to all paper sizes.
When performing code 05-1642
When performing code 05-1644-0
When performing code 05-1644-2
When performing code 05-1644-3
When performing code 05-1644-4
When performing code 05-1644-5
When performing code 05-1644-6
When performing code 05-1644-7
When performing code 05-1644-8
3 - 29
• Laser optical unit
• Drum cleaning blade
• Image position aligning sensor
P.3-8 "3.1.6 Image Dimensional
<Adjustment Mode (05)>
Contents
Remark
All paper types
Recycled paper
Thick paper1
Thick paper2
Thick paper3
Thick paper4
Special paper 1
Special paper 2
e-STUDIO2020C/2330C/2820C/2830C/3520C/3530C/4520C
P.3-4
Paper type
Plain paper
ADJUSTMENT
3
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