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24 February, 1999
TONER SUPPLY CONTROL
Toner near end detection
Toner end sensor
The toner end sensor detects light reflected from a mirror inside the toner hopper
(see 'Development – Toner End Detection'). There are two levels of output, namely
High (5V: no reflection/toner present) and Low (0V: reflection detected/no toner).
For C, M, and Y toners, the toner near end detection routine using V
begins
SP
when the toner end sensor detects four consecutive low signals.
This sensor does not work for K toner because toner adhering to the window
blocks reflection back to the sensor. For K toner, only V
is used.
SP
Toner near end detection routine using V
SP
Toner near end is displayed on the operation panel when the amount of toner
(M/A) calculated during toner supply control is less than the target supply (0.4
2
2
mg/cm
for C, M, and Y; 0.25 mg/cm
for K) five times in succession.
Toner end detection
When a color reaches the toner near-end condition, 10 more pages can be made
with that color.
Then, if during those 10 pages, the pixel count for the color in question reached
500%, the copier displays toner end for that color and that color cannot be used.
(100% is defined as one A4 image with the color in question covering the whole
page at full strength.)
If the pixel count has not yet reached 500% after 10 pages, copying can continue
until the pixel count reaches 500%. Then, the copier displays toner end for that
color and that color cannot be used.
If the pixel count reaches 500% during the first 10 pages, copying is not stopped,
but that color toner may appear pale on the output.
This process is the same for the K, C, M, and Y toners.
2-17
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