Ricoh FT5233 Service Manual page 51

DRUM CHARGE
3.3.3 V Correction
R
Grid Bias Correction Voltage
–160 V
–120 V
–80 V
–40V
0 27
(4)
(3)
V Level
R
According to the results of the V
corrected as shown in the above table.
The V correction is also applied to the development bias voltage.
R
3.3.4 V Data Correction
R
Drum Grid Bias V
Temperature
Over 25°C No correction
25°C or lower
NOTE: V level (max.)=4
R
If the temperature around the drum is 25°C or less when the main switch is
turned on, the V
R
in the above table.
V data correction is also applied to the development bias voltage and the
R
low temp. correction is applied to the exposure lamp voltage simultaneously
under this condition.
40 57 83
(1)
(2) (0)
V Level Vrp/Vrg x 100 (%)
R
0
1
2
3
4
pattern detection, the grid bias voltage is
R
R
Correction
V level +1
R
data correction is applied to the grid bias voltage as shown
(%)
100
Grid Bias Correction Voltage
100~84
83~58
57~41
40~28
27~0
2-22
12 February 1992
±0V
–40V
–80V
–120V
–160V