DEVELOPMENT
B234/B235/B236/D101/D102/D103 6-92 SM
6.12.8 TONER DENSITY CONTROL
Overview
There are two modes for controlling toner supply: sensor control mode and image
pixel count control mode. The mode can be selected with SP2208. The factory
setting is sensor control mode. Image pixel count mode should only be used if the
TD or ID sensor is defective and cannot be replaced immediately.
Toner Supply Timing
After the trailing edge of the image leaves the development area, the machine
calculates how long the toner supply motor should be switched on (based on the
TD sensor reading). Then, the toner supply motor switches on for the time
prescribed by the calculation. Until the toner supply motor switches off, the
development motor, drum motor, charge, and development bias all remain on.
Regardless of whether the machine is in the sensor control or pixel count toner
supply mode, toner is supplied based on the setting for the toner supply interval
entered with SP2974 (Toner Supply Interval); the default is every print.
• If the TD sensor malfunctions, then toner is supplied for each copy and the
setting for SP2974 is ignored.
• The SP2974 setting has no effect on the ID sensor pattern interval; the ID sensor
pattern interval is set with SP2210 (ID Sensor Pattern Interval)
TD Sensor
Output (V
T)
ID Sensor Output
(V
SP/VSG)
GAINPixel Count
Toner Supply Motor On Time
Calculation
VREF Update
TD Sensor Initial
Setting (V
REF)
VT Reference
Voltage (V
REF)
VT Reference
Voltage Update
(New VREF)
B234D9944.WMF
[A]
[B]
To Next Page
Loading...
