Ricoh B132 Service Manual page 568

SERVICE PROGRAM TABLES
3562 Display Vk
Displays Vk, the development start voltage. This development start voltage is used
to indicate whether the developer has deteriorated. However, this is only a rough
measurement due to other factors:
•
A low threshold setting for the target development gamma.
•
Operational variations between machines
•
Precision of the ID sensor measurements
Normal range for Vk: -150V to +150V
3563 Display Vr
Vr is the potential that remains on the surface of the drum after full exposure to the
laser. The existence of this residual voltage is used as an indicator to determine the
level of deterioration of the drum. Vr becomes larger as the drum deteriorates.
Normal range for Vr: -200V to 0V
001 K
002 M
003 C
004 Y
3571 Display V0
Displays the value for V0, the measure of drum potential on dark areas of the drum
before laser exposure.
Normal range: -700 V to –500 V
001 K [-999~0/1 V]
002 M
003 C
004 Y
3572 Display Vdhome
Displays the value for Vdhome, the electrical potential of the drum after a fixed dc
bias (dc –700V) is applied by the drum charge roller.
Normal range: -700V to –500V
001 Vl Ctrl:Half:K
002 Vl Ctrl:Half:M
003 Vl Ctrl:Half:C
004 Vl Ctrl:Half:Y
B132/B200
Display Vk (Development Start Voltage)
Display Vr (Residual Potential)
[-300 to +300/1 V]
Display Vd (Value for Control of Charge Potential)
Display Vl (Value for Control of Halftone Drum Potential)
[-999~0/1 V]
5-90 SM