HP 4 plus C2037A, C2021A, 5n C3952A Black Pages, Possible Cause Action, Any Faint Print Condition

Table 7-12	Black Pages
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		Remove the HVPS, and check the
HVPS has been removed and replaced,		connectors for damage. Reseat the
it may not be seated properly.		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		Replace the DC Controller PCA, followed
circuitry is damaged so that the laser is		by the Formatter PCA if required.
always on.
Table 7-13
	Any Faint Print Condition
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		Set the print density to a darker level.
the print density setting, the more toner		Replace the high voltage power supply if
transferred to the drum.		this has no effect.
The paper finish, conductivity, or		Try a known good source of paper from a
moisture content may not be suitable for		freshly opened package. Refer to the HP
the electro-photographic printing process.		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		Adjust the print density setting as shown
inadequate, or no developer bias is		in Chapter 3.
produced, toner is not attracted to the
image written on the drum.

7-38 Troubleshooting