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(Also, V
is corrected. This is used for toner supply control.)
REF
This controls the development potential to make sure that the maximum quantity of toner applied to the
drum is constant.
If SP 3501 1 is set to "1" (Fixed), the machine does not do the potential control, but uses the following
parameters:
• Development bias adjusted with SP 2212 1 to 8
• Charge roller voltage adjusted with SP 2201 1 to 9
• Laser power selected with SP 2105 1 to 12.
These SPs are not normally adjusted in the field.
Process Control Self-check
This machine does potential control with a procedure that is known as the process control self-check. This
procedure is done at these 9 times.
1. Initial
This starts automatically at the following times:
• Immediately after the power is turned on
• When the machine comes back from energy saver mode
• 6 hours after the power was turned on (adjusted with SP 3554 1)
• If absolute humidity changes more than ± 6 g/m
70%). The humidity threshold can be changed with SP 3554 2.
2. Interval: Job End
At the end of a job, process control is done after the interval of time that is set with SP 3555 1, if more
than 450 prints were made after the previous process control (this number can be adjusted with SP
3551 1 and 2).
At the end of a job, process control is done immediately, if more than 450 prints were made after the
previous process control (this number can be adjusted with SP 3551 3 and 4).
The default setting of SP 3555 1 is "0". Because of this, there is no difference between these two
processes, and the 450-print setting is not used.
After process control is done (except for forced process control), the counters are reset to "0."
3. Interval: Interrupt (default: 500)
If the machine makes a sequence of 500 or more color prints in the same job, printing stops and
process control is done. After it is completed, the machine continues to make prints. The default value
of 500 can be adjusted with SP 3551 5 to 6
4. Non-use Time (6 hours)
3
(e.g. changes from 23°C/ 50% to 27°C/
Process Control
6
351
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Troubleshooting
