Ricoh FT5233 Service Manual page 35

PROCESS CONTROL
4.0 V
Vsg
Vsp
[Vsg abrormal]
(3) ID Sensor Abnormal Conditions
The following ID sensor abnormal conditions apply to both the detect and
fixed supply modes.
a. Vsg abnormal
When Vsg falls under 2.5V, the CPU stops the toner supply and
continues the ID sensor pattern detection (every 10 copies for black
and every 5 copies for color). If this abnormal value of Vsg is detected
5 times in a row under this condition (without any toner supply), the
CPU makes the call service indicator blink. Then the CPU shifts the
toner supply to the abnormal fixed supply mode. But in this condition
the CPU never stops the toner supply as it does to avoid overtoning in
the normal fixed supply mode.
b. Vsp abnormal
When [Vsp/Vsg X 100] goes to 50 or more, the CPU changes the toner
supply amount to the ID sensor abnormal level and continues toner
supply and ID sensor pattern detection. If this abnormal value of Vsp is
detected 5 times in a row, the CPU makes the call service indicator
blink. Then the CPU shifts the toner supply to the abnormal fixed
supply mode, as it does under a Vsg abnormal condition.
NOTE: The CPU continues the ID sensor pattern detection even under
the ID sensor abnormal conditions.
For both black and color toners, if Vsg and Vsp return to the
normal range at any of the subsequent toner density check
cycles, the CPU will return the toner supply control to normal.
Vsg
2.5 V
Vsp
2-6
12 February 1992
[Vsp abnormal]
100% (4.0 V)
50% (2.0 V)