Ricoh SP5 Series Service Manual page 221

SERVICE PROGRAM MODE
Mode No.
(Class 1 , 2 & & & & 3)
4-904 IPU Setting -1
1 Laser Pulse
Positioning in
Text and
Text/Photo
2 Dither Matrix
Selection
3 Filter Type
Selection -
Photo Mode
6 Generation
Mode
7 Gradation
Process in
Text Area
8 Gradation
Process in
Photo Area
9 Image Data
Path
Function
* Selects whether or not laser pulse
positioning control is used in text and
text/photo modes
Do not change the value.
* Selects the dither matrix for photo mode
when SP4-904-24 is "2".
If "0" is selected, the image will be sharper.
This SP is ignored unless the user selects
'SP Mode Changed' in UP mode.
* Selects the filter type for photo mode.
Coefficients used:
0: SP4-903-15, 1: SP4-903-16
If "0" is selected, the image will be sharper.
However, dot screen areas will be faint.
This SP is ignored unless the user selects
'SP Mode Changed' in UP mode.
* Selects the line width correction type for
generation copy mode.
In copied original mode, lines may bulge in
the main scan direction. Adjust this SP
mode until the result is satisfactory.
This SP is ignored unless the user selects
'SP Mode Changed' in UP mode.
* Selects the process used for text areas in text/photo mode.
0: 1-dot grayscale
1: 1-dot – 9 level error diffusion
If "1" is selected, the image becomes sharper in focus.
However, gradation will be reduced.
This SP is ignored unless the user selects 'SP Mode
Changed' in UP mode.
* Selects the process used for photo areas in text/photo
mode.
0: 1-dot grayscale
1: 1-dot – 9 level error diffusion
2: 2-dot grayscale
3: 2-dot – 17 level error diffusion
As the setting increases from 1 to 3, the image becomes
sharper in focus. However, gradation will be reduced.
This SP is ignored unless the user selects 'SP Mode
Changed' in UP mode.
Selects one of the following video data outputs, which will be
used for printing.
0: After image scanning
1: After image data form application
2: After gradation processing
3: Test pattern
4: Normal video processing
Do not change the value.
4-28
June 30, 1998
Settings
0: Off
1: On
0: 4 x 4
1: 6 x 6
0: MTF
1:
Smoothing
0: Not
corrected
1: Thin line-1
2: Thin line-
2
3: Thick line