Toshiba e-STUDIO 6550Ce-STUDIO 5560C - Image Quality Adjustment (Copying Function); Automatic Gamma Adjustment

To Next Page

To Previous Page

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  P. 6 -

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

adjustment of  P. 6-41"6.2.11 Beam level conversion setting" is made, color pattern and

black pattern need to be adjusted individually.

(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

Related product manuals