Ricoh A156 - Page 57

For ID Level 7 (lightest copies), there are four possible development bias
correction settings that can be selected with SP2-201-002, as shown below.
Table 3. Lightest ID level development bias (ID Level 7)
SP2-201-002 Setting Density
Dev. Bias
Correction Voltage
1 (Factory Setting) Normal –40 V
2 Dark
±
0 V
3 Lighter –80 V
4 Lightest –120 V
In summary, the development bias at various ID level settings is shown
below.
1.2.2 Reproduction Ratio Correction
At reproduction ratios of 50% and 116% or greater, the intensity of light
reaching the drum from the original drops significantly, which could cause
copies to become underexposed (too dark).
To compensate for this, a development bias correction voltage is applied as
shown in Table 4. This correction increases the development bias voltage,
restoring the copy image density to normal.
Table 4. Reproduction ratio correction
Reproduction
Ratio (%)
Development Bias
Correction Voltage
181 ~ 200 –100 V
161 ~ 180 –80 V
142 ~ 160 –60 V
123 ~ 141 –40 V
116 ~ 122 –20 V
51 ~ 115
±
0 V
50 –30 V
–280
–240
–320
1765432
ID Level
Development Bias Voltage
–320
(Lighter)
–240
(Darker)
–280
(Normal)
–360
(Lightest)
SP2-201-002
for ID Level 7
–160
Detailed
Descriptions
STM 2-9 A156/A160/A162