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Possible Cause Action
The HVPS connections are dirty. Clean the HVPS terminals (see Figure
7-18 for layout).
The HVPS is installed improperly. If the
HVPS has been removed and replaced,
it may not be seated properly.
Remove the HVPS, and check the
connectors for damage. Reseat the
HVPS, being certain to fully seat the
connectors.
Bad Primary Charging Roller. Replace the Toner Cartridge.
The HVPS is defective. Replace the HVPS.
DC Controller PCA. The laser drive
circuitry is damaged so that the laser is
always on.
Replace the DC Controller PCA, followed
by the Formatter PCA if required.
Table 7-12
Black Pages
Possible Cause Action
Printer set to Economode. Change driver and/or Control Panel
settings to ECONOMODE=OFF.
Toner Cartridge. Replace the Toner Cartridge.
Print density set improperly. The higher
the print density setting, the more toner
transferred to the drum.
Set the print density to a darker level.
Replace the high voltage power supply if
this has no effect.
The paper finish, conductivity, or
moisture content may not be suitable for
the electro-photographic printing process.
Try a known good source of paper from a
freshly opened package. Refer to the HP
LaserJet Family Paper Specifications
Guide for media specifications.
The transfer roller may be defective. Replace or reseat the roller.
Weak or no developer bias. If
inadequate, or no developer bias is
produced, toner is not attracted to the
image written on the drum.
Adjust the print density setting as shown
in Chapter 3.
Table 7-13 Any Faint Print Condition
7-38 Troubleshooting