Ricoh Aficio FT4027, Руководство по обслуживанию

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6.5 V
R
PATTERN CORRECTION
@
The values in the ID correction column of the table have been changed.
V
R
correction
ID Correction
Drum Charge Roller
Correction Voltage
Development Bias
Correction Voltage ±
0 V –40 V –80 V
V
RP
/
VRG
x
100 (%)
74 ~ 100 68 ~ 100 62 ~ 100
±
0 V
±
0 V
53 ~ 73 50 ~ 67 43 ~ 61 –40 V –40 V
41 ~ 52 37 ~ 49 26 ~ 42 –80 V –80 V
31 ~ 40 26 ~ 36 19 ~ 25 –120 V –120 V
0 ~ 30 0 ~ 25 0 ~ 18 –160 V –160 V
For example, taking the ID correction to be zero for now, if V
RP
/V
RG
is 45%,
the drum charge and development bias corrections will both be –80 V.
V
R
correction also depends on the current V
SP
pattern ID correction that is
being used. If development bias has been increased by ID correction, the V
R
correction may be smaller in some cases to take this into account. This is
shown by both the table above and the following diagram.
Using the same example to illustrate this, but with an ID correction of –80 V,
the corrections will both be –40 V this time.
1 0 0 8 0 6 0 4 0 1 0 2 0 3 0 5 0 7 0 9 0
– 4 0 V
– 8 0 V
– 1 2 0 V
– 1 6 0 V
– 0 V
D r u m r e s i d u a l
voltage small D r u m r e s i d u a l
voltage largel
V
R
Correction Voltage
V
R P
/V
R G
(%)
ID correction
0 V
– 4 0 V
– 8 0 V
A204D505.wmf
PROCESS CONTROL
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