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1) Three toner patched of different densities are made on the OPC
drum by the three different bias voltages, and are transferred on
the transfer belt. The developing bias voltage (Dvpx) at that time is
as follows:
the transfer belt. The developing bias voltage (Dvpx) at that time is
as follows:
2) Three toner patch densities (reflection lights) are read by the im-
age density sensor to check that the intersection of lines connect-
ing three toner patch density points reaches the reference density
level.
(The reference density level is set with SIM 44-4. It differs depend-
ing on the color.)
ing three toner patch density points reaches the reference density
level.
(The reference density level is set with SIM 44-4. It differs depend-
ing on the color.)
If the above condition is satisfied, the correction developing bais
voltage (PADVx) and the developing bias voltage (DVx) are calcu-
lated for the reference density level by the linear approximation
method.
voltage (PADVx) and the developing bias voltage (DVx) are calcu-
lated for the reference density level by the linear approximation
method.
If the condition of (2) is not satisfied, perform the following procedure.
3) The toner patch making conditions are changed as shown below
to make three toner patches of different densities on the OCP
drum and transfer them on the transfer belt.
drum and transfer them on the transfer belt.
4) Three toner patch densities (reflection lights) are read by the im-
age density sensor to check that the intersection of lines connect-
ing three toner patch density points reaches the reference density
level.
(The reference density level is set with SIM 44-4. It differs depend-
ing on the color.)
If the above condition is satisfied, the correction developing bias
voltage (PADVx) and the actual developing bias voltage (DVx) are
calculated for the reference density level by the linear approxima-
tion method.
Procedures 3) and 4) are repeated until the above condition is sat-
isfied. (However, the multiplier "n" increases.)
ing three toner patch density points reaches the reference density
level.
(The reference density level is set with SIM 44-4. It differs depend-
ing on the color.)
If the above condition is satisfied, the correction developing bias
voltage (PADVx) and the actual developing bias voltage (DVx) are
calculated for the reference density level by the linear approxima-
tion method.
Procedures 3) and 4) are repeated until the above condition is sat-
isfied. (However, the multiplier "n" increases.)
(Case 2) When the developing bias voltage correction is performed for the second time after performing once, the developing bias voltage set in the
previous correction is used as the start point.
The basic operations are the same as (Case 1).
DEVELOPING BIAS VOLTAGE CORRECTION(Color)
DEVELOPING BIAS VOLTAGE CORRECTION(Color)
Higher
Image patch density
100
90
83
Lower
100
200
300
400
500
600
Develping bias voltage
Limit(-600v)
PTK1/BS1(ID1)
PTK2/BS2(ID2)
PTK3/BS3(ID3)
PTK2/BS2(ID2)
PTK5/BS5(ID5)
PTK1/BS1(ID1)
PTK6/BS6(ID6)
Y/M/C PAT TARGET ID(Set by
SIM44-4)
SIM44-4)
Limit(-125v)
Correction voltage 1(PADVx1)
Correction voltage 2(PADVx2)
2nd stage
1st stage
1st stage
PT3/BS3(ID3)
PTK4/BS4(ID4)2
AR-C150
3 – 6
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