The machine is not equipped with a means (sensor) to directly check the level of toner inside the toner cartridge (all
4 cartridges), and uses the measurements it takes of the patch images it forms on the photosensitive drum to find out
the presence/absence of toner.
<Particulars of Control>
1) supplies toner to the inside of the developing unit.
2) forms a patch image on the photosensitive drum, and reads its density using the patch image read sensor.
3) compares the measurement against the reference value
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v
i) if measurement >= reference value,
-> the machine assumes that toner exists inside the toner cartridge, and ends toner level detection control.
ii) if measurement < reference value
-> the machine repeats steps 1 through 3 a specific number of times; if the measurement still does not exceed the
reference value, the machine will assume that toner does not exist inside the toner cartridge, and moves the
developing rotary to the point of toner cartridge replacement and then indicates the message "No toner" on its
control panel.
- when the toner cartridge access cover/front cover is opened/closed after the machine identifies the absence of toner
(the machine is not equipped with a sensor to check the presence/absence of the toner cartridge; it will execute
toner level detection control automatically when the toner cartridge access cover/front cover is opened and closed
after it has identified the absence of toner regardless of the presence/absence of a cartridge).
It takes about 70 sec for the machine to execute the control mechanism.
I have had a faulty cover sensor cause this problem because it did not run the toner detection control after the cartridge was replaced.
hope this helps.
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