Gestetner B147 Service Manual page 328

COPY SERVICE MODE
4-904 [Scanner IPU Test]
4-904-1 Test1:Register Access
Performs a write and read check of the ASICs on the scanner IPU board and displays
the result.
4-904-2 Test2: Image Path
Performs an image path check on the scanner IPU board and displays the result.
4-905 [Dither Selection]
Changes the parameters for error diffusion.
4-905-1 Dither Selection
4-907 [VPU Test Pattern]
4-907-1 Test Pattern: R
Selects the test pattern generated by the controller board.
4-907-2 Test Pattern: G
Selects the test pattern generated by the controller board.
4-907-3 Test Pattern: B
Selects the test pattern generated by the scanner IPU board.
4-918 [Manual Gamma Adj.]
4-918-9 Adjusts the offset data of the printer gamma for yellow in Photo mode.
See 'Replacement and Adjustment – Gamma Correction – Copy Mode' for how to
use.
Offset: Highlight
Offset: Middle
Offset: Shadow
Offset: IDmax
Adjusts the option data of the printer gamma for yellow in Photo mode.
Option: Highlight
Option: Middle
Option: Shadow
Option: IDmax
B147/B149/B190
00: OK
11, 12, 13, 14, 15: NG
00: OK
21, 22, 23, 24, 25: NG
*CTL
[ 0 to 255 / 0 / 1/step ] DFU
[ 0 to 4 / 0 / 1 /step ]
0: Default (Scanned Image)
1: Cyan pattern
2: White pattern
3: Cyan Pattern 16 steps
4: Line pattern
[ 0 to 4 / 0 / 1 /step ]
0: Default (Scanned Image)
1: Magenta pattern
2: White pattern
3: Magenta Pattern 16 steps
4: Line pattern
[ 0 to 4 / 0 / 1 /step ]
0: Default (Scanned Image)
1: Yellow pattern
2: White pattern
3: Yellow Pattern 16 steps
4: Line pattern
*CTL [ 0 to 30 / 15 / 1 /step ]
*CTL [ 0 to 255 / 0 / 1 /step ] DFU
5-40 SM