Image defect details

Background scatter

•The media does not meet HP specifications.

•The toner cartridge is defective.

•The inside of the printer is dirty.

•The transfer roller is dirty or worn.

•The pickup roller is dirty.

•Generate a cleaning page.

Black pages

•The toner cartridge was improperly installed.

•The primary charging roller is defective.

•The laser/scanner assembly is faulty (turning laser on continuously).

–The connectors between the laser/scanner unit and the ECU or DC controller PCA are not seated properly or are defective. Reseat the controller unit or PCA.

–The high-voltage power supply connections are dirty. Clean the connections.

•The high-voltage power supply is installed improperly. If the high- voltage power supply has been removed and replaced, it might not be seated properly.

–Reseat the high-voltage power supply.

–Check the ECU for damage.

246 Chapter 9 – Image quality

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