Ricoh Aficio 401 - Page 28

Mode No. Function Settings
Class 1 Class 2
4904
8
GA4 Setting
(Image
Process mode
in
Letter/Photo
mode: Photo
Areas)
Selects the image processing mode used for photo areas
in the Letter/Photo mode.
0: 1 x 1 dot processing
1: Error diffusion with 1 x 1 dot processing
2: 2 x 1 dot processing
3: Error diffusion with 2 x 1 dot processing
A smaller value causes the image to become more sharp
in focus.
Only works if 4904-4 is at 0.
10
GA4 Setting
(GA4 Test
Data)
Prints the test pattern for the GA4 IC, to test the GA4 chip
on the EX-IPU.
0: No Print
1: Gradation
2: Cross
3: Black bands
12 *
GA4 Setting
(BK Thresh
Level)
Changes the threshold level for binary
picture processing mode.
0 ~ 255
1 /step
40
A larger value causes the image to
become lighter.
13 *
GA4 Setting
(Top point
Level)
The value for pixels at an edge in binary
picture processing mode.
0 ~ 255
1 /step
128
Do not change the value.
14 *
GA4 Setting
(All Black
Level)
The value for black areas in binary picture
processing mode.
0 ~ 255
1 /step
255
Do not change the value.
16 *
GA4 Setting
(Print Top
Point Level)
The value for pixels at an edge in stamp
mode.
0 ~ 255
1 /step
128
Do not change the value.
17 *
GA4 Setting
(Print All
Black Level)
The value for black areas in stamp mode. 0 ~ 255
1 /step
255
Do not change the value.
18 *
GA4 Setting
(Dither
Pattern)
Selects the dither pattern used in binary
picture processing mode.
0: 70-line
1: 95-line
2: 140-line
3: 180-line
Do not change the value
.
4905
1
Path setting
(MSU video in)
Do not change the value 0
✽
2
Path Setting
(ASAP Video
In)
Use to check the external ASAP video
interface with the dummy board. See the
"External ASAP Video I/F Test" section
for details.
Before this test is performed, the main
controller should be replaced with the
dummy board
0: Normal
1: Test
4907
GA4 Setting
(Auto
letter/photo
separation)
Selects whether the auto letter/photo
separation is performed in the
Letter/Photo mode or not.
Disabled
Enabled
Test purposes only
A195
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25 April 1997 SERVICE PROGRAM MODE TABLES
25