Ricoh FT5233 Service Manual page 63

OPTICS
4.7 EXPOSURE LAMP CONTROL
The base exposure lamp voltage (Vexp) is determined by SP mode #48
according to the actual copy image when the drum initial setting (SP66) is
performed. Based on this Vexp, the exposure lamp voltage differs depending
on the modes and correction factors.
4.7.1 Manual ID Correction
Lamp
ID Level
Voltage
1 Vexp –2V
2 Vexp –2V
3 Vexp –1V
Vexp ±0V
4
5 Vexp +1V
6 Vexp +1V
7 Vexp +2V
SP48: Lamp Voltage
0~75 V=Vexp
(63V=Default
When an image density level is selected by the manual image density keys
on the operation panel, the exposure lamp voltage is changed as shown in
the above table.
The voltage changes ±2V within manual ID levels 1 to 7.
The grid bias voltage and the development bias voltage also change to make
the appropriate image density graduation for each ID level.
Lamp
Voltage
Vexp
+2
+1
±0
– 2
– 2
1
)
2-34
2 3 4 5
12 February 1992
6 7 ID Level