Toshiba e-STUDIO2303A - Image Quality Adjustment (Copying Function)

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SETTING / ADJUSTMENT
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6.4 Image Quality Adjustment (Copying Function)
6.4.1 Automatic gamma adjustment
When the reproduction of gradation is not appropriate, it can be corrected by performing this automatic
gamma adjustment. At the parts replacement and in case the gradation reproduction of the image is not
satisfactory, make this adjustment as described below.
(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 roller • Drum cleaning blade
• Main charger grid • Memory IC
*
* 23LA/23LM/28LM: IC10
20L/23L/25L/20H/23H/25H/23HA/28HA: IC11
<Procedure>
(1) While pressing [0] and [5] simultaneously, turn the power ON.  Adjustment Mode
(2) [SETTINGS]  [USER FUNCTIONS]  Select [DRAWER]  Select [DRAWER1]
 Set the paper size to A4/LT.  [OK]  Set A4/LT for the paper in upper drawer.
(3) [CANCEL]  [CANCEL]  [SETTINGS] (Return to code entry screen.)
 [10] [SETTINGS] [START] (A gamma adjustment patch chart is printed out.)
(4) Place the patch chart for adjustment printed in step (3) face down on the original glass. Place the
chart aligning its black side of the gradation pattern against the original scale.
(5) Key in a code “7165” and press the [START] button.
(6) If process finishes successfully, select “Yes” and press the [OK] button to apply the adjustments.
(To cancel the reflection of adjustment results, press the [CANCEL] button.)
In the case of an abnormal ending, “Error” is shown.
Press the [CANCEL] button to clear the error display. Next, confirm that the patch chart is
oriented correctly on the platen and not at an angle, then do the process from step (4) again.
(7) Press [20]  Press [SETTINGS]  Press [START].
Notes:
• Compare with chart output in step (3), there should be no differences in patterns and no faint
colors.
(8) Place the patch chart for adjustment printed in step (7) face down on the original glass. Place the
chart aligning its black side of the gradation pattern against the original scale.
(9) Key in a code “7167” and press the [START] button.
(10) If process finishes successfully, select “Yes” and press the [OK] button to apply the adjustments.
(To cancel the reflection of adjustment results, press the [CANCEL] button.)
In the case of an abnormal ending, “Error” is shown. Press the [CANCEL] button to clear the
error display. Next, confirm that the patch chart is oriented correctly on the platen and not at an
angle, then do the process from step (9) again.
(11) Turn the power OFF.
Code Item to be adjusted Contents
05-7165 Automatic gamma
adjustment
When the reproduction of gradation is not appropriate, it can be corrected by
performing this automatic gamma adjustment.
05-7167 Automatic gamma
adjustment (binary
dithering)