PROCESS CONTROL August 2006
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6.11.3 POTENTIAL CONTROL

When is Potential Control Done?

1. Initial process control self-check. The process control self-check is done
automatically after the machine is turned on, if the pressure roller thermistor
detects that the fusing temperature is below 100°C (adjust this temp with
SP3554 001).
NOTE: The initial process control self-check is not done when the machine is
turned on with the front door open.
2. At the end of every job, if the number of pages since the previous
process control is more than the value of SP3551.
There are separate counters for black-and-white and color pages.
• Black-and-white: After 250 pages (adjust with SP3551 001)
• Color: After 200 pages (adjust with SP3551 002)
Either SP code can be set to "0", which disables this feature.
3. Before ACC (Automatic Color Calibration) The process control self-check is
done after pressing [Execute] on the operation panel to start ACC and just
before the ACC pattern prints. However, this operation can be changed with
SP3501 004:
0 Process control self-check is not done before the ACC pattern prints.
1 A partial self-check (only potential control) is done before the ACC pattern pr ints.
This takes about 24 seconds.
2 The full process control self-check (potential control and toner dens ity control) is
done before the ACC pattern prints (default). This takes between 24 seconds and
180 seconds.
4. Immediately after initialization of the TD sensor. The process control self-
check is done automatically every time a TD sensor is initialized.
• Done after SP3801 001-006 is executed (after replacing the developer).
• Done after SP3811 is executed (at machine installation, or after replacing
developer). See section 3.5.7 for details on the SPs to do after you replace a
part.
5. Potential control process control self-check. This is done with SP3820 001.
6. Potential control and toner density adjustment process control self-check.
This is done with SP3820 002. This SP must be done manually when the drum
is replaced without replacing the developer at the same time.