Ricoh A230 Service Manual page 759

BIT SWITCHES
Scanner Switch 09
No FUNCTION
0
Scan density step value
to (Special original mode)
3
4 Not used.
to
7
Scanner Switch 0A
No FUNCTION
0 Binary picture processing:
to Threshold for Special original
7 mode - Normal setting (center
position)
Scanner Switch 0B - Not used (do not change the settings)
A230/A231/A232
COMMENTS
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 (20), the
threshold value changes as follows:
+3 (Darkest) : 68 (= 88 – 20)
+2 : 88 (= 108 – 20)
+1 : 108 (= 128 - 20)
0 (Normal) : 128 (Scanner Switch 02 setting)
-1 : 148 (= 128 + 20)
-2 : 168 (= 148 + 20)
-3 (Lightest) : 188 (= 168 + 20)
The value can be between 00 and 1F (H) [=
31(D)].
For a darker threshold, input a lower value.
Default setting - 20
Do not change the settings.
COMMENTS
This setting determines the threshold value for
binary picture processing in Text mode (when the
scan density setting is at the center).
The value can be between 00 and FF. For a
darker threshold, input a lower value.
Default setting: 77(H) = 119(D)
4-34
SM