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4.4 TONER DENSITY CONTROL
Toner Sensor
Check
The flow chart above illustrates how the copier determines whether or not to
add toner.
This copier uses a dual sensor system to control toner density. The primary
sensor is the ID sensor (image density sensor). This sensor is a photosensor
and directly measures the density of the image on the drum using a test
pattern. This is done just before making the copy. If the test pattern image
density is too low, toner is added.
The secondary sensor is the toner sensor. It measures the ratio of toner to
carrier in the developer. This sensor is used only if the output of the ID sensor
is abnormal or the original is longer than 1200 millimeters. (For very long
originals, it is possible for the toner density to change while the copy is being
made.)
ID Sensor
Check
Yes
ID sensor
normal?
No
Toner
Yes
sensor
normal?
No
Service Call
indicator ON
Toner
density
low?
Yes
Toner supply
solenoid ON
Original
longer than
1200 mm?
Yes
Toner
density
low?
Yes
Toner supply
solenoid ON
2-19
6 January 1990
No
No
No
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