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1.6 Automatic Gamma Adjustment
(1) At the unpacking
When the tone reproduction deviation is too large, it can be corrected by the automatic gamma
adjustment.
This adjustment shall be done upon user's request when the tone reproduction is too high or too
low.
(2) When any of the following parts is replaced, this adjustment is required.
• Halogen lamp
• Lens unit
(3) When any of the following parts is replaced or adjusted, check the copy image and determine the
necessity of this adjustment.
• Optical system position (CRG1, CRG2 position)
• Reflector
• Main charger
• Separation
Note) This adjustment must be done only after the image adjustment described in 1.5.
Code
Adjustment item
580
Automatic gamma
adjustment
2460 ADJUSTMENT
• Original glass with shading board
• Laser optical system unit
• Drum
• Development bias
• Pre-cleaning discharge charger
[Procedure]
(1) Turn on the power switch with "05".
(2) Select A3 or LD paper for the output paper size.
(3) Press the "2" key and then "FAX" key.
(One copy of the 33-gradation pattern is outputted.)
(4) Confirm that there is no blank or line on the gradation pattern outputted in
the above step (3) and the density changes gradually.
If there is any problem in the gradation pattern, repeat the step (3) to output
a gradation pattern again.
(5) Face the dense side of the output gradation pattern to the original scale at
the exit side and put it on the original glass with the printed face down.
(6) Input the code "580" through the control panel and press the START key.
(The scanner automatically reads the original and the operation for the
automatic gamma adjustment will be done. About 10 seconds)
(7) When the operation completes normally, the machine returns to the stand-
by status. If the operation terminates abnormally, "TEST MODE ERROR"
will be displayed. (See the indication on the next page.)
For the abnormal termination, press the C/S key to release the error
indication. When released, the display on the control panel returns to the
stand-by status. Check the position, direction and skew of the gradation
pattern on the original glass, and repeat the steps from (5).
1 - 38
• Mirror 1, 2, 3
• Developer
• Transfer charger
Procedure
September 1997 © TOSHIBA CORP.
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