Scanner Switches - Ricoh A193 Service Manual

BIT SWITCHES

2.2 SCANNER SWITCHES

Scanner Switch 00
No FUNCTION
0 Not used
to
3
4 OR processing for immediate
tx
0: Disabled
1: Enabled
5 Not used
to
7
Scanner Switch 01
No FUNCTION
0 Scan density step value
to (Text mode)
4
5 Not used.
to
7
SM
Do not change the settings.
This switch is only effective when the scanner and the
IPU of the base copier machine work together to get a
required resolution.
0: Every other line is skipped
1: Two consecutive lines are OR-processed
Cross Reference
See "Original Scan Process" in chapter 2.
Do not change the settings.
When scan density is adjusted manually away from the
Normal setting, the threshold value for binary picture
processing changes for each step from the value
specified by Scanner Switch 02, by the amount
programmed here.
For example, with the default settings (15), the
threshold value changes as follows .
+3 (Darkest) : 83 (=98 - 15)
+2 : 98 (=113 - 15)
+1 : 113 (=128 - 15)
0 (Normal) : 128 (Scanner Switch 02 setting)
-1 : 143 (=128 + 15)
-2 : 158 (=143 + 15)
-3 (Lightest) : 173 (=158 + 15)
The value can be between 00 and 1F (H) [= 31(D)].
For a darker threshold, input a lower value.
Default setting - 15
Do not change the settings.
4-30
COMMENTS
COMMENTS
(A639)