Gestetner G060 Service Manual page 453

3.3.4 PRINTER GAMMA CORRECTION
NOTE: Normally, the ACC is enough to adjust the color balance to achieve the
optimum print output. The printer gamma correction is only required for
fine-tuning to meet user requirements.
The printer gamma curve created during ACC can be modified using SP modes.
The gamma data for highlight, middle, shadow areas, and IDmax can be adjusted.
The adjustable range is from 0 to 30 (31 steps).
Printer Mode
There are six adjustable modes:
• 1200 x 1200 photo mode (select this mode with printer SP1-102-1)
• 600 x 600 text mode (select this mode with printer SP1-102-2)
• 1200 x 600 text mode (select this mode with printer SP1-102-3)
• 600 x 600 photo mode (select this mode with printer SP1-102-4)
• 1200 x 600 photo mode (select this mode with printer SP1-102-5)
• 1200 x 1200 text mode (select this mode with printer SP1-102-6)
K
Highlight
SP1-104-1
Middle
SP1-104-2
Shadow
SP1-104-3
IDmax
SP1-104-4
Adjustment Procedure
1. Do an ACC for the printer mode.
2. Turn the main power off and on.
3. Enter SP mode.
4. Select "Printer SP".
5. Select SP1-102 and select the print mode that you are going to adjust.
6. To review the image quality for these settings, choose SP1-103-1 to print out a
tone control test sheet.
7. Adjust the color density with SP1-104 as shown below comparing the tone
control test sheet with the C4 test chart.
NOTE: Adjust the density in order from "ID Max", "Shadow", "Middle", and then
"Highlight".
8. Save the adjusted settings with SP1-105.
SM
C M
SP1-104-21 SP1-104-41
SP1-104-22 SP1-104-42
SP1-104-23 SP1-104-43
SP1-104-24 SP1-104-44
3-5
IMAGE ADJUSTMENT
Y
SP1-104-61
SP1-104-62
SP1-104-63
SP1-104-64
G570