Ricoh FT2260 Service Manual page 48

1 August 1988
Lamp Voltage Compensation -
-
Compensation processing consists of changing the timing of the exposure
lamp trigger in response to the feedback voltage. If the lamp voltage is too
low, the CPU sends the trigger pulses earlier so that more ac power is applied
to the exposure lamp. The compensation is performed instantly; so, the lamp
voltage is always stable even under fluctuating ac power conditions.
The feed-back voltages for each of the manual image density levels are
shown below. (In actual operation, these values are slightly modified by the
reduction/enlargement exposure correction.)
- Manual Image Density Control -
ID Level
Lamp Voltage
115 V machine
Lamp Voltage
220/240 V
machine
The above table shows the approximate voltage applied to the exposure lamp
at each manual image density level.
1.69 V
1.78V
1.90 V
2.06 V
2.24 V
1 2 3
65 68 71
133 137 144
2-10
4 5
75 80
153 164