Ricoh FT5034 Service Manual page 67

4. Vsp Variation
The following diagram shows the variation factors which affect Vsp and their results.
<Variation Factor> <Image Density> <Vsp> <Toner Supply> <Toner Density> <Vsp Image Density>
(low)
1. Charge
(high)
(strong)
2. Exposure
(weak)
(rapid)
3. Drum Sensitivity
(slow)
(high)
4. Development Bias
(low)
5. ID Sensor
1. When SP mode (54) is changed to "11", the LED of the ID sensor turns on.
Consequently, Vsg is measured at TP103 (ID sensor output) and TP101 (GND).
(Vsg can be adjusted by VR101.)
Vsg can also be monitored on the LCD display through SP mode.
light high
dark low
•
If we change the output of the C/B power pack or
the lamp regulator, the image density detected by
the ID sensor also returns to the original
condition. But this may cause toner scattering or
carrier attraction to the drum because the toner
density of the developer is changed.
ID sensor
output
- 66 -
supplied high
no supplied low
ID sensor LED
return to the
original condition