Lexmark C500n Service Manual page 44

5023-110
5. Variation of the OPC belt potential:
a. The OPC belt is biased to -CBV(V).
b. The OPC belt surface is evenly charged to -Vo(V) during the charging process.
c. During the exposing process, the optical unit emits a laser beam that strikes the OPC belt surface
forming an electrostatic image. The electrostatic image is at -VR(V) potential.
d. The negatively charged toner is moved to the OPC belt in the development process due to the
difference between
-VR(V) and -DBV(V). A visible image is the result.
e. The negatively charged toner on the OPC belt is moved to the transfer belt because the potential
GND of the transfer belt is greater than -VR(V) of the OPC belt.
f. The OPC belt is discharged by the erase lamp radiating on the OPC belt.
OPC belt
-CBV
1-22
Service Manual
Latent image
-CBV -V0 -V0 -V0
-CBV -V0
-V0 -V0
-CBV -V0 -V0 -V0
-CBV -V0 -V0 -V0
Laser diode
Charging
exposing
1
2
0V
OPC belt surface
-CBV
-VR
-V0
Charge brush
Discharge roller
OPC charging system
-CHV
DCV
(-BRV)
Toner image
-V0 -V0 -V0 -V0 -V0
-V0 -V0
TEST TEST
-V0 -V0
PRINT PRINT
-V0 -V0
-V0 -V0 -V0
K Y M C
Developing
3
Transfer belt
4
-DBV
Developer roller
-DBV
-V0 -CBV
-CBV
-CBV
-CBV
TEST
Blade
PRINT
6
Erase lamp
5
(M)toner