To Adjust The Copy Image Quality In The Black Mode - Toshiba e-STUDIO 2500c Manual

2. Copier-specific Adjustments

2.6.1 To Adjust the Copy Image Quality in the Black Mode

* You can start with any of the procedures. But it is recommended to perform the procedures in order, as listed
below. You can use one procedure in conjunction with another. But if this changes the image quality more
than required or loses the effectiveness of the adjustment, restore the settings made in the previously used
procedure to the original ones. Then use other procedures.
* Both the service technician and the user can use procedure (1).
* Only the service technician must use procedures (2) to (4).
(1) Press the [IMAGE] button on the Control Panel. Press the [BACKGROUND ADJUSTMENT] button.
Press the [LIGHT] button to decrease the background density.
After decreasing the background density, copy and check the image quality.
With the background density set to the minimum, if further image quality adjustments are still necessary, the
service technician must use the next procedure.
(2) Enter adjustment mode [05]. Change the values for codes [600/601] to adjust the background density.
Original
mode
Text/Photo
Text
* Set the value in increments of approximately 1, while checking the copy image until the optimum value is obtained.
After adjusting the background density, copy and check the copy image quality.
If further image quality adjustments are still necessary, use the next procedure.
(3) Enter adjustment mode [05]. Change the values for codes [590/591] to adjust the gamma curve balance of
the low- and medium-density areas.
Original
mode
Text/Photo
Text
* Set the value in increments of approximately 20, while checking the copy image until the optimum value is obtained.
* The subcode varies according to the area where the density is adjusted. Refer to the table below and set
the subcode for the area to be adjusted. The background density will vary, if the low- or medium-density
area is mainly adjusted. Setting "2" for the subcode allows you to adjust the high-density area. But it will
not affect the background density. Therefore, never change the value for the high-density area.
Subcode
0
1
After adjusting the gamma curve balance, copy and check the copy image quality.
If further image quality adjustments are still necessary, use the next procedure.
2.6
e-STUDIO2500c/3500c/3510c
[05] code Recommended value
05-600
Set a value smaller than 5.
05-601
[05] code Subcode
05-590 0/1
Set a value smaller than 128.
05-591 0/1
Area where the density is adjusted
Low-density area
Medium-density area
Acceptable
value range
1 to 9
Recommended value
Default
5
Acceptable
Default
value range
0 to 255 128