Td Sensor Check And Toner Supply Timing - Ricoh A219 Service Manual

TONER SUPPLY

6.4 TD SENSOR CHECK AND TONER SUPPLY TIMING

Original Scan
D r u m C h a r g e
T D S e n s o r
Toner Supply Motor
When a copy job begins the TD sensor voltage is monitored for two seconds
when the 1st copy drum charge starts. The CPU checks the voltage every 40
ms and stores the second highest voltage of every 240 ms period. The
voltages stored during the two seconds are averaged, and then the average
is used as the TD sensor output value for that detection period. The TD
sensor output value is used to determine the toner supply clutch on time.
Then an appropriate amount of toner is added by the toner supply motor (as
described in Toner Supply Amount). The TD sensor is monitored for
two-second intervals until the last original scan is finished. Unlike a toner
supply clutch mechanism, with a toner supply motor, the copier can add toner
during image development.
A219
CÓPIA NÃO CONTROLADA
2 s 2 s
2-28
CÓPIA NÃO CONTROLADA
(seconds)
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