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PROCESS CONTROL
NOTE: For Y, C, and M toners, the new type of ID sensor allows higher densities
of toner to be measured accurately (refer to the descriptions in Step 4,
Sensor Pattern Density Detection). This permits the calculation of γ M/A at
a higher accuracy than a normal reflection ID sensor, because the
measurements at higher densities (M/A values) are more reliable.
Step 7: Selecting the Optimum V
The machine now adjusts V
V
to the ideal value. To do this, it uses a pointer table. This is a look-up table in
DP
ROM of V
against V
DP
The machine takes the value of V
for the value of V
DP
the values of V
, V
D
The machine will then use these values of V
next process control self check. These values are designed to bring the actual V
to the optimum value for the machine's current condition.
• V
: Drum potential without exposure - to adjust this, the machine adjusts the
D
charge corona grid voltage (V
• V
: Drum potential with the strongest exposure - to adjust this, the machine
L
adjusts the laser diode input current (I
V
: Development bias
B
D
, V
, and V
D
B
, V
, and V
D
B
L.
calculated in the previous section, and looks
DP
in the pointer table that is closest to this. The machine reads
, and V
that are in this row of the pointer table.
B
L
)
G
, V
, V
B
L
to try to bring the development potential
L
, V
, and V
D
B
)
LD
2-10
24 February, 1999
during copying until the
L
DP
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