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at the workshop and moved to the user location,
When you open the drum positioning plate
When you remove or replace the motors, clutches, and/or gears related to the drum/development/transfer sections
When you remove or replace the image transfer belt, image transfer belt unit or laser optical housing unit
4.19.6 PRINTER GAMMA CORRECTION
The ACC is usually sufficient to adjust the color balance to get the best print output. You only need the printer gamma correction to fine-tune to meet user requirements.
Use SP modes if you want to modify the printer gamma curve created with ACC. You can adjust the gamma data for the following:
Highlight
Middle
Shadow areas
IDmax.
The adjustable range is from 0 to 30 (31 steps).
Copy Mode
- KCMY Color Balance Adjustment -
The adjustment uses only "Offset" values.
Never change "Option" values (default value is 0).
Highlight (Low ID) | Levels 2 through 5 in the C4 chart 10-level scale |
Middle (Middle ID) | Levels 3 through 7 in the C4 chart 10-level scale |
Shadow (High ID) | Levels 6 through 9 in the C4 chart 10-level scale |
ID max | Level 10 in the C4 chart 10-level scale (affects the entire image density.) |
Offset | The higher the number in the range associated with the low ID, middle ID, high ID, and ID max, the greater the density. |
There are four adjustable modes (can be adjusted with SP4-918-009):
Copy Photo mode
Copy Letter mode
Copy Letter (Single Color) mode
Image Adjustment
Copy Photo (Single Color) mode
- Adjustment Procedure -
1. Copy the C-4 chart in the mode that you want to adjust.
Replacement and Adjustment
Replacement and Adjustment
Replacement and Adjustment
2. Enter the SP mode.
3. Select "System SP." 4. Select SP4-918-009.
5. Adjust the offset values until the copy quality conforms to the standard (see the table below).
1. Never change "Option" value (default value is "0").
2. Adjust the density in this order: "ID Max", "Middle", "Shadow", "Highlight".
- Photo Mode, Full Color -
Item to Adjust | Level on the C-4 chart | Adjustment Standard | |
1 | ID max: (K, C, M, and Y) |
| Adjust the offset value so that the density of level 10 matches that of level 10 on the C-4 chart. |
2 | Middle (Middle ID) (K, C, M, and Y) |
| Adjust the offset value so that the density of level 6 matches that of level 6 on the C-4 chart. |
3 | Shadow (High ID) (K, C, M, and Y) |
| Adjust the offset value so that the density of level 8 matches that of level 8 on the C-4 chart. |
Image Adjustment
4 | Highlight (Low ID) (K, C, M, and Y) |
| Adjust the offset value so that dirty background does not show on the copy and the density of level 3 is slightly lighter than that of level 3 on the C-4 chart. |
| Adjust the offset value so | ||
that the color balance of | |||
K Highlight (Low ID) | black scale levels 3 through | ||
5 | (C,M, and Y) <on the full color | 5 in the copy is seen as gray (no C, M, or Y should be | |
copy> | visible). If the black scale | ||
contains C, M, or Y, do steps | |||
1 to 4 again. |
- Photo Mode, Single Color -
Item to Adjust | Level on the C-4 chart | Adjustment Standard | |
1 | ID max: (K) |
| Adjust the offset value so that the density of level 10 matches that of level 10 on the C-4 chart. |
2 | Middle (Middle ID) (K) |
| Adjust the offset value so that the density of level 6 matches that of level 6 on the C-4 chart. |
3 | Shadow (High ID) (K) |
| Adjust the offset value so that the density of level 8 matches that of level 8 on the C-4 chart. |
Image Adjustment
| Adjust the offset value so | ||
that dirty background does | |||
4 | Highlight (Low ID) (K) | not show on the copy and the density of level 3 is | |
slightly lighter than that of | |||
level 3 on the C-4 chart. |
Replacement and Adjustment
Replacement and Adjustment
Replacement and Adjustment
- Text (Letter) Mode, Full Color -
Item to Adjust | Level on the C-4 chart (K) | Adjustment Standard | |
1 | ID max: (K, C, M, and Y) |
| Adjust the offset value so that the density of level 10 matches that of level 10 on the C-4 chart. |
2 | Middle (Middle ID) (K, C, M, and Y) |
| Adjust the offset value so that the density of level 6 matches that of level 6 on the C-4 chart. |
3 | Shadow (High ID) (K, C, M, and Y) |
| Adjust the offset value so that the density of level 8 matches that of level 8 on the C-4 chart. |
4 | Highlight (Low ID) (K, C, M, and Y) |
| Adjust the offset value so that dirty background does not show on the copy and the density of level 3 is slightly lighter than that of level 3 on the C-4 chart. |
