Panasonic FP-D250 User Manual page 50

CPU will check toner density sensor output. (2.5 V)
Yes
Memory number will be changed to new number in memory.
(F6-21 or F6-26)
Toner density sensor output voltage will be adjusted to 2.5 V
(2) Maintain standard toner density
By checking the output voltage of the TDC sensor for every copy, the timing of
toner supply to the developer unit is controlled so that the output voltage is 2.5V
the at all times keeping the toner density constant.
Check TDC sensor output voltage at copying (or mixing).
Is the measured output voltage over 2.5V?
NO
YES
Do not supply toner.
F8-09 start
No
CPU will adjust sensor gain
control signal
Supply toner: from reserve tank for 6.7 seconds
(amount of toner supply: approx. 0.4 ~ 1.2 g)
Rotate bottle for 7 seconds: toner to reserve tank.
(Toner is not supplied to developer unit.)
Note) During bottle rotation toner is not supplied to
the developer unit.
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