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DRUM UNIT
The phase that is used depends on the number of copies since the start of the job.
See the table below for details.
Number of copies in the job
10 or fewer
More than 10
Toner Density Sensor Initial Setting
When new developer is installed, TD sensor initial setting must be done using
SP2-801. This sets the sensor output to 2.5 V. This value will be used as the TD
sensor reference voltage (V
If the sensor output cannot be adjusted to within the standard, SC341 or SC342 is
logged and the toner density control is set to the pixel count control.
V
and V
Detection
SP
SG
The ID sensor detects the following voltages.
• V
: The ID sensor output when checking the drum surface
SG
• V
: The ID sensor output when checking the ID sensor pattern
SP
In this way, the reflectivity of both the drum and the pattern on the drum are
checked.
The ID sensor pattern is made on the drum with the charge corona and laser diode.
V
Update
REF
To update V
(the TD sensor reference voltage), V
REF
of the copy job, if 10 or more copies have been made since the last V
This compensates for any variations in the reflectivity of the pattern on the drum or
the reflectivity of the drum surface. The 10 copy interval can be changed using
SP2-210.
V
is also updated during process control initial setting.
REF
If the reading of the ID sensor becomes abnormal while checking the ID sensor
pattern, SC350, SC351, or SC352 is logged and the toner density control is done
using TD sensor only.
See "V
Update" in the Process Control section for more details.
REF
A294/A295
CÓPIA NÃO CONTROLADA
Copy no.
1 to 10
First 10
From 11
).
REF
2-44
CÓPIA NÃO CONTROLADA
Control method
ID Sensor Control
ID Sensor Control
TD Sensor Control
/V
is detected at the end
SP
SG
REF
update.
SM
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Troubleshooting
