Read Sharp MX-M850 (serv.man20) Service Manual online
MX-M1100 PHOTOCONDUCTOR SECTION i – 6
5. Discharge section
In this section, light is exposed onto the OPC drum to discharge the whole surface of the OPC drum.
A. Electrical and mechanism relation diagram
B. Operational descriptions
When the discharge lamp light is expose the OPC drum CGL layer,
positive and negative charges are generated. Positive charges
generated in the CGL are attracted by negative charges on the
OPC drum surface.
On the other hand, negative charges are attracted by positive
charges in the aluminum layer of the OPC drum.
Therefore, positive charges and negative charges are counterbal-
anced on the surface and in the aluminum layer of the OPC drum to
reduce positive and negative charges, lowering the potential of the
whole surface of the OPC drum.
As a result, the surface potential of the OPC drum is reset to the ini-
tial level.
positive and negative charges are generated. Positive charges
generated in the CGL are attracted by negative charges on the
OPC drum surface.
On the other hand, negative charges are attracted by positive
charges in the aluminum layer of the OPC drum.
Therefore, positive charges and negative charges are counterbal-
anced on the surface and in the aluminum layer of the OPC drum to
reduce positive and negative charges, lowering the potential of the
whole surface of the OPC drum.
As a result, the surface potential of the OPC drum is reset to the ini-
tial level.
Code
Name
Function / Operation
Type
DL1
Discharge lamp
Discharges the residual potential on the OPC drum.
LED
PTDL1
PTDL1
PTDL1
PTDL1
DL1
DL1
DL1
DL1
3 +24V_DL
3
4 XDL1
4
1 +24V_DL
2 (NC)
3
2 (NC)
3
SMR-07V-B/SMP-07V-BC
XDL1
+24V_DL
36B-PNDZS-1
CN-9
4
3 +24V_DL
3
XDL1
5
4 XDL1
4
PCU PWB
OPC drum
CTL
CGL
Aluminum
layer
CGL
Aluminum
layer
DL1
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