Gestetner B147 Service Manual page 122

IMAGE ADJUSTMENT
Adjustment Procedure
1. Copy the C-4 chart in mode that you are going to adjust.
2. Enter the SP mode.
3. Select "Copy SP."
4. Select SP4-918-009.
5. Adjust the offset values until the copy quality conforms to the standard (
table below).
NOTE: 1) Never change "Option" value (default value is 0).
2) Adjust the density in order from "ID Max," "Middle," "Shadow," and then
"Highlight."
- Photo Mode, Full Colour -
Step Item to Adjust
ID max:
1 (K, C, M, and Y)
Middle (Middle ID)
2 (K, C, M, and Y)
Shadow (High ID)
3 (K, C, M, and Y)
Highlight (Low ID)
(K, C, M, and Y)
4
K Highlight (Low ID)
(C,M, and Y)
<on the full color
5 copy>
B147B149/B190
Level on the C-4 chart
3-8
Adjustment Standard
Adjust the offset value so that
the density of level 10 matches
that of level 10 on the C-4 chart.
Adjust the offset value so that
the density of level 6 matches
that of level 6 on the C-4 chart.
Adjust the offset value so that
the density of level 8 matches
that of level 8 on the C-4 chart.
Adjust the offset value so that
dirty background is not visible on
the copy and the density of level
3 is slightly lighter that of level 3
on the C-4 chart.
Adjust the offset value so that
the color balance of black scale
levels 3 through 5 in the copy is
seen as gray (no C, M, or Y
should be visible). If the black
scale contains C, M, or Y, redo
step 1 to 4.
the
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