- Hewlett-Packard LaserJet Printer Service Manual

High-Voltage Power Supply Check
The High-Voltage Power Supply PCA provides the necessary voltages for the
electrophotographic processes. A method for verifying the high-voltage system is
given in the table below.
Toner Cartridge High Voltage Connection Points (1 of 2)
• Charging (1)
• Drum Ground (2)
• Developing Roller (3)
Checks Action
Toner Cartridge Connection Points Visually inspect the three connection points on the
underside, right end of the toner cartridge. If they
are dirty or corroded, clean the connections. Use
alcohol only. If damaged, replace the toner
cartridge. (See Figure 7-5 below.)
High Voltage Connector Assembly This assembly uses spring-loaded pins to contact
the toner cartridge. (See Figure 7-6 on the following
page.) Verify that the pins are not dirty or corroded
and that the spring-loading action is functional. If the
pins are dirty, clean using alcohol only; if damaged,
replace the High Voltage Connector Assembly.
Table 7-5 High-Voltage Power Supply Check
Figure 7-5
7-24 Troubleshooting