Ricoh B264 Service Manual page 293

4903* Filter Setting
Many filter setting SP modes have discussions in section 6. ( 6.2)
4903 5 Full Size Mode
Selects whether the copy is always full size, even if the magnification ratio has
been changed. Set to 1 to check the main scan magnification. If the magnification
is not 100%, the image processing circuits could be malfunctioning.
This SP is used to determine whether magnification is operating correctly. If this
SP is set to 1 can make it easier to determine which part of the IPU is
malfunctioning.
Image Shift in Magnification
4903 7
Adjusts the amount of pixel shift in the main scan direction in the magnification
mode.
4903 8* Fax 25%, 50% Reduction
Determines whether 25% and 50% reduction is available in the fax mode.
0: Off
1: Conducts fax mode OR processing for main scan for resolution below 100 dpi
in only Text mode.
2: Conducts pre-filter processing for fax mode.
3: Conducts fax Text mode OR processing for main scan for resolution below 100
dpi. Pre-filter processing is done in every mode except Fax Text mode.
4903 10 to 4903 16, Pre-Filter Processing ( 6.5)
The following 5 SP modes Selects the filter processing setting for smoothing in
order to reduce the incidence of moiré in images in different original modes.
Specifically, they set 1) the compression rate for parallel lines in the main scan
direction and for long lines in the sub scan direction, and 2) the strength of
smoothing.
Enter the appropriate number with the10-key pad then press .
These settings attempt to smooth lines without making them standout. Increasing
the strength of a setting can reduce the incidence of moiré but can also decrease
sharpness.
4903 10* Pre-Filter: Text
4903 12* Pre-Filter: Photo Mode
4903 13* Pre-Filter: Text/Photo
4903 15* Pre-Filter: Light
Pre-Filter: Generation
4903 16*
4903 20 to 4903 35, Text Mode MTF Filter Coefficient and MTF Filter Strength
The following 15 SP modes select either the MTF filter coefficient (Level) or the
MTF filter strength for text mode at various reproduction ratios. Each SP applies to
either the main-scan direction or the sub-scan direction. ( 6.5)
4903 20* Main Filter Level: Text 25%-64%
4903 21* Sub Filter Level: Text 25%-64%
4903 22* Main Filter Strength: Text 25%-64%
4903 23* Sub Filter Strength: Text 25%-64%
4903 24* Main Filter Level: Text 65%-154%
4903 25* Main Filter Strength: Text 65%-154%
4903 26* Sub Filter Level: Text 65%-154%
4903 27* Sub Filter Strength: Text 65%-154%
4903 28* Main Filter Level: Text 155%-256%
4903 29* Sub Filter Level: Text 155%-256%
4903 30* Main Filter Strength: Text 155%-256%
4903 31* Sub Filter Strength: Text 155%-256%
4903 32* Main Filter Level: Text 257%-400%
SM
SERVICE PROGRAM MODE TABLES
0: No. Normal operation
1: Yes. Main scan magnification always full-size
DFU, [0~7199 / 0 / 1 step]
DFU, [0~3 / 0 / 1 step]
[0~9 / 0 / 1]
[0~9 / 0 / 1 step]
[0~9 / 0 / 1 step]
[0~9 / 0 / 1 step]
[0~9 / 0 / 1 step]
[0~15 / 9 / 1 step]
[0~13 / 13 / 1 step]
[0~7 / 2 / 1 step]
[0~15 / 2 / 1 step]
[0~7 / 12 / 1 step]
[0~13 / 13 / 1 step]
[0~7 / 2 / 1 step]
[0~7 / 2 / 1 step]
[0~15 / 14 / 1 step]
[0~13 / 13 / 1 step]
[0~7 / 2 / 1 step]
[0~7 / 2 / 1 step]
[0~15 / 15 / 1 step]
5-29 B264/B265