e-STUDIO2820C/2830C/3520C/3530C/4520C © 2008 TOSHIBA TEC CORPORATION All rights reserved
ADJUSTMENT
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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 repro-
duction 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 adjust-
ment:
• 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)
(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  P.3-5
"3.1.3 Performing Image Quality Control" and  P.3-9 "3.1.6 Image Dimensional Adjust-
ment".
2. Normally, only the adjustment of color/black integrated pattern is needed. When the adjust-
ment of  P.3-41 "3.2.12 Beam level conversion setting" is made, color pattern and black
pattern need to be adjusted individually.
<Adjustment Mode (05)>
Code Item to be adjusted Contents
1642
(1643)
(580)
Automatic gamma
adjustment
When the reproduction of gradation is not appropriate, the gradation reproduc-
ibility 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.
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