Practical Application Of Sp Modes; Solving Problems - Ricoh B079 Service Manual

IMAGE PROCESSING

6.5.14 PRACTICAL APPLICATION OF SP MODES

Solving Problems

This section describes some common problems that can be solved with SP code
adjustments. This table lists the recommended settings; fine adjustments may be
required for the actual type of originals that the customer is copying.
NOTE: To do the settings in the table below, first you must set the Master SP code
to "0". (!"FILTERING", 6-23~6-31)
Job
Eliminate blue lines from graph
paper, or erase shadows caused
by originals that have been pasted
up for layout.
Eliminate orange or other color
backgrounds from official
documents.
Reproduce blue lines of graph
paper.
De-emphasize fine lines in jagged
valleys and reduce the occurrence
of moiré.
Reduce the occurrence of moiré
when reducing the size of the
original for copying.
Reproduce areas of graduated fill
in high density originals in Photo
mode.
Sharpen text in Photo mode.
Improve the appearance of
originals handwritten with pencil,
or make lighter copies of color
originals (invoices and other
commonly used business forms)
B079/B082
CÓPIA NÃO CONTROLADA
User Tool
• Lighten the image density for
Text mode.
• Select "Soft" for Text mode
(User Tools).
• Darken the image density for
Text/Photo mode.
• Select "Sharp" for the
Text/Photo mode (User Tools).
• Select "Soft" for Text mode
(User Tools).
• Select "Soft" for Text mode
(User Tools).
• Select "Glossy Photo" for Photo
mode (User Tools).
• Select "Normal" or "Glossy
Photo" for Photo mode (User
Tools).
• Select "Sharp" for Pale mode
(User Tools).
• Select "Sharp" for Text mode
(User Tools).
6-44
CÓPIA NÃO CONTROLADA
Custom Setting Adjustment
• Increase the setting of
SP4903 60 (Independent Dot
Erase) to about 6 ~ 10.
• Increase the setting of
SP4903 65 (Background
Erase) to about 20 ~ 60.
• Increase the setting of
SP4903 60 (Independent Dot
Erase) to about 10 ~ 15.
• Increase the setting of
SP4903 65 (Background
Erase) to about 120 ~ 160.
Weaken the MTF filters for Text
mode:
• SP4903 24, Main Scan: 9
• SP4903 25, Sub Scan: 13
• SP4903 26, Main Scan: 2
• SP4903 27, Sub Scan: 2
Weaken the MTF filters for Text
mode reduction:
• SP4903 20, Main Scan: 14
• SP4903 21, Sub Scan: 13
• SP4903 22, Main Scan: 1
• SP4903 23, Sub Scan: 1
Set SP4904 1 to "1" to enable
error diffusion.
Strengthen the settings for the
Photo mode MTF filters
coefficients:
• SP4903 36: Select "3"
• SP4903 38: Select "1"
Strengthen the MTF filters for
Pale mode:
• SP4903 55: Select "3"
• SP4903 56: Select "4"
Strengthen the MTF filters for
Text mode:
• SP4903 24: Set to "9".
• SP4903 25: Set to "13".
• SP4903 26: Set to "3".
• SP4903 27: Set to "3".
SM