Ricoh FT4460 Service Manual page 360

2. Check Vsg in SP Mode No.54
Adjust Vsg to 4 ± 0.2V by turning VR102 on the operation panel.
NOTE: Though the Vsp level can be displayed by pressing the 0 key in SP
Mode No.55, adjustments can only be made in SP Mode No.54.
3. Make a copy to see whether the toner supply clutch is on or off.
(1) If toner is supplied while image density is too high:
Check Vsp with SP Mode No.55.
If Vsp is too high, check and adjust the ID sensor bias voltage, charge
current, and ID sensor grid.
If Vsp is too low, check the level of CN303-A13 on the I/O control board.
L: Replace toner supply clutch.
H: Replace I/O control board.
- Considerations -
Does toner density decrease when Vsg is raised?
(Example)
If the toner density is too high (though Vsg is 4V) and Vsg is raised to
about 5V, does toner density decrease?
(Comments)
When Vsg is raised (VR102), the intensity of light emitted by the ID
sensor LED increases as does the intensity of light reflected from the ID
sensor pattern (Vsp). There is no change in the ratio of Vsp to Vsg, so
there is no change in the toner density.
S y s t e m C o n t r o l B o a r d
12-23
28 February 1989