Toshiba e-STUDIO3511, Service Handbook, Page: 223 / 552

November 2003 © TOSHIBA TEC 3 - 33 e-STUDIO3511/4511 ADJUSTMENT
3.6 Image Quality Adjustment (Printing Function)
3.6.1 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.
Contents
<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”.
Pattern No. Language/Resolution Remarks
47 PS/600x600dpi When performing code 1000
48* PS/1200x600dpi When performing code 1001
49 PCL/600x600dpi When performing code 1002
50* PCL/1200x600dpi When performing code 1003
*Perform the adjustment only when the expansion memory has
been installed.
(3) Place the patch chart for adjustment printed in step (2) face down
on the original glass, with its side, on which two black squares are
present, aligned 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 shown.
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 the 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 afterward.
Code
1000
1001
1002
1003
Adjustment item
Automatic gamma
adjustment
<Adjustment Mode (05)>
(2) When any of the following parts are replaced or adjusted, make a print and check the image to
determine if adjustment is necessary:
• 2nd transfer roller
Note: Be sure that this adjustment be made after performing the image adjustment in "3.3
Adjustment of Image Quality Control" and "3.4 Image Dimensional Adjustment".
(1) When unpacking or any of the following parts has been unpacked 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