Canon iR C3200 Series, Руководство по обслуживанию

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Chapter 9
9-17
9.4.3 ATR Control
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The machine executes ATR control to maintain a specific image density, which otherwise would change as more and
more toner is used.
The machine measures the concentration of toner and adjusts its supply.
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F-9-15
9.4.4
Discharge Current Level Control
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- The machine controls the level of discharge current so as to ensure the optimum level in keeping with changes in
temperature/humidify. (The term "discharge current"refers to the current that occurs between the primary
charging roller and the photosensitive drum.) The current is controlled to a level that enables prevention of faulty
images in a high humidity environment and, at the same time, permits collection of toner remaining from transfer
to the developing assembly. Operation
1. An AC bias is applied to the primary charging assembly; the level of current occurring at the time is measured by
the high-voltage PCB (HV1-SUB) and is sent to the CPU on the DC controller PCB as feedback.
2. The roller is charged using the AC charging bias corrected by the CPU.
- If thick paper, special paper, or transparency is used, the frequency of the AC bias applied to the primary charging
roller is halved.
Measures the concentration
of toner inside the developing
assembly at all items
(ATR sensor)
Computes the change in density from 2 sets of
measurements (data)
Forms a sample image
(every specific number of pages)
Verifies the volume of toner to supply
Determines the volume of
toner to be supplied
ATR control
Measures the density of the sample image
(SALT sensor)
SALT sensor
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