Savin 4027 Service Manual download pdf (Page 454)

100

101

6.5 V

PATTERN CORRECTION

The values in the ID correction column of the table have been changed.

correction

ID Correction

Drum Charge Roller

Correction Voltage

Development Bias

Correction Voltage

±0 V

–40 V –80 V

VRG

100 (%)

74 ~ 100 68 ~ 100 62 ~ 100

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

is 45%,

the drum charge and development bias corrections will both be –80 V.

correction also depends on the current V

pattern ID correction that is

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.

Using the same example to illustrate this, but with an ID correction of –80 V,

the corrections will both be –40 V this time.

10080604010 20 30 50 70 90

–40 V

–80 V

–120 V

–160 V

–0 V

Drum residual

volta

e small

Drum residual

volta

e lar

Correction Voltage

(

)

ID correction

0 V

–40 V

–80 V

A204D505.wmf

PROCESS CONTROL

SM 1-22 A207/A208/A211

CÓPIA NÃO CONTROLADA

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