Toshiba 4511, 3511 3.5 Image Quality Adjustment (Copying Function)

November 2003 © TOSHIBA TEC 3 - 21 e-STUDIO3511/4511 ADJUSTMENT

(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 "3.3 Adjust-

ment of Image Quality Control" and "3.4 Image Dimensional Adjustment".

2. Normally, only the adjustment of color/black integrated pattern is needed. When the adjust-

ment of "3.5.12 Beam level conversion setting" is made, color pattern and black pattern need

to be adjusted individually.

Contents

(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”.

Pattern No. Pattern Remarks

4 Color/black integrated When performing code 1642

10* Black When performing code 580

5* Color When performing code 1643

* This adjustment is performed only when "3.5.12 Beam level

conversion setting" is performed. Usually, only the adjustment

with the color/black integrated pattern (05-1642) is performed.

(3) Place the patch chart for adjustment printed in step (2) face down

on the original glass. In the cases of patterns 4 and 5, place the

chart aligning its side with 2 black squares against the original scale.

In the case of pattern 10, place the chart aligning its black side of

the gradation pattern 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.).

(5)

When the adjustment has finished normally, “ENTER” is sh own. Press the

[ENTER] button to have the adjustment results reflected.

(To cancel the reflection of adjustment results , press the [CANCEL] button.)

In the case of an abnormal ending, “ADJUSTMENT ERROR” is shown.

Press the [CANCEL] button to clear th e error display. When it is cleared,

the control panel display will return to the ready state. Then, check if the

patch chart on the original glass is placed in the wrong direction or if it is

placed inclined on the original glass, and then repeat step (3) and after-

ward.

3.5 Image Quality Adjustment (Copying Function)

Item to be adjusted

Automatic gamma

adjustment

Code

1642

(1643)

(580)

3.5.1 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 or replaced, be sure to make this adjustment:

• Laser optical unit • Photoconductive drum • Developer material

• Main charger wire • Main charger grid • Transfer belt

• 1st transfer roller • Drum cleaning blade • Drum cleaner brush

• Image guality sensor

04/05