Ricoh FT5233 Service Manual page 65

OPTICS
4.7.4 Low Temperature Correction
Drum Lamp Correction
Temperature
Over 25°C
25°C or lower
If the temperature around the drum is 25°C or less when the main switch is
turned on, low temperature correction is applied to the exposure lamp voltage
as shown in the above table.
Under this condition V
and development bias voltage.
4.7.5 Total Exposure Lamp Voltage
The total exposure lamp voltage for each mode is determined by the CPU as
follows:
(1) ADS Mode
Vexp(SP48) + Reproduction Ratio Correction + V
Temp. Correction
(2) Manual ID Mode
Vexp(SP48) + Manual ID Correction + Reproduction Ratio Correction +
V Correction + Low Temp. Correction
L
(3) ID Sensor Pattern Detection
The same as the ADS mode or the manual ID mode depending on which
mode is being set for making the ID sensor pattern.
(4) V Pattern Detection
L
Vexp(SP48) + V
(5) Auto ADS Gain Adjustment (SP56)
64V (fixed)
Voltage
±0V
+1V
data correction is also applied to both the grid bias
R
Correction + Low Temp. Correction
L
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12 February 1992
Correction + Low
L