1.11 HVPSA Density Circuits
1.11.2 HVPSA Circuits
Figure 1–15 gives signal names, connector numbers, and shows the circuitry
that drives and loads the HVPSA.
Figure 1–15 HVPSA Image Circuits
DC Control Board
HVPSA
+
_
Trans
Develop
Primary
HVDC
6
HVAC
3
HVT1
7
HVT3
10
HVT2
9
HVD
8
VR
4
VR701 Density
Adjustment
+12 V
HVAC
VR
VR
J206
J601
J602-1
TB601
J602-2
MLO-006187
HV Door
Switch
The HVPSA is operated by the DC control board. The primary and
development high-voltage power supplies connect to the EP-L cartridge by
flat spring contacts. The transfer supply connects to the transfer roller in the
front door assembly by a coil spring contact that you can see when the front
door is open. The HV door switch shorts the supply to ground when the front
door is opened.
The flat and coil springs are chrome plated and require no maintenance. Use
a soft brush to clean away dust or paper chips, but avoid using commercially
available liquid or aerosol contact cleaners. Do not attempt to scrape clean,
bend back, or repair damaged contacts.
1–26 Physical and Functional Description
