Ricoh FT5535 Service Manual page 525

6.5 V PATTERN CORRECTION
R
The values in the ID correction column of the table have been changed.
V correction
R
ID Correction
±0 V
74 ~ 100
53 ~ 73
V /
RP VRG
41 ~ 52
100 (%)
x
31 ~ 40
0 ~ 30
For example, taking the ID correction to be zero for now, if V
the drum charge and development bias corrections will both be –80 V.
V correction also depends on the current V
R
being used. If development bias has been increased by ID correction, the V
correction may be smaller in some cases to take this into account. This is
shown by both the table above and the following diagram.
– 1 6 0 V
– 1 2 0 V
– 8 0 V
– 4 0 V
–0 V
1 0
Drum residual
voltage largel
Using the same example to illustrate this, but with an ID correction of –80 V,
the corrections will both be –40 V this time.
A207/A208/A211
Drum Charge Roller
Correction Voltage
–40 V –80 V
68 ~ 100 62 ~ 100
50 ~ 67 43 ~ 61
37 ~ 49 26 ~ 42
26 ~ 36 19 ~ 25
0 ~ 25 0 ~ 18
2 0 3 0 4 0
V /V
R P R G
1-22
PROCESS CONTROL
Development Bias
Correction Voltage
±0 V
–40 V
–80 V
–120 V
–160 V
RP
pattern ID correction that is
SP
5 0 6 0 7 0
(%)
±0 V
–40 V
–80 V
–120 V
–160 V
/V is 45%,
RG
R
ID correction
0 V
– 4 0 V
– 8 0 V
8 0 9 0 1 0 0
Drum residual
voltage small
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