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FC-210/310 ADJUSTMENT 2 - 24 February 2002 © TOSHIBA TEC
Code Adjustment item Contents
643 Automatic gamma
adjustment
2.6.1 Automatic gamma adjustment
(1) At the time of unpacking:
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. Check the image, and if
the gradation reproduction is not satisfactory, make this adjustment as described below.
(2) When any of the following parts has been replaced, be sure to make this adjustment:
• Laser optical unit • Photoconductive Drum • Developer material
(3) When any of the following parts are replaced or adjusted, make a copy and check the image to
determine if adjustment is necessary:
• Main charger • Transfer belt
Note: Be sure that this adjustment be made after performing the image adjustment in "2.3 Adjustment of Image
Quality Control", "2.4 Adjustment of Color Registration Control" and "2.5 Image Dimensional Adjustment".
<Procedure>
(1) While pressing [0] and [5] simultaneously, turn the power ON. ৎ
Adjustment mode
(2) Select the A3 cassette. Press [4] ৎ [PRINTER/NETWORK]
key and output a “Patch chart for gamma adjustment”.
(3) Place the patch chart for adjustment produced in step (2) face
down on the original glass, with its side, on which a black band
is present, aligned against the original scale.
(4) Enter code [643] with digital keys and press the [START] key.
ৎ The scanner reads the chart automatically and performs
automatic gamma adjustment calculation (approx. 30 sec.).
(5) When the adjustment has finished normally, “SCAN COMPLETE”
is shown. Press the [START] key to have the adjustment results
reflected. (To cancel the reflection of adjustment results, press
the [STOP] key.)
Note: After the [START] key is pressed, the printer section will operate
for about 15 seconds and the density of the standard pattern for image
quality control will be measured.
In the case of an abnormal ending, “ADJUSTMENT ERROR” is
shown. Press the [STOP] key to clear the error display. When it
is cleared, the control panel display will return to the standby
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.
2.6 Image Quality Adjustment