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HP Color LaserJet 5500 and 5550 Series Printers - Cleaning and Maintaining the Printer
Periodic cleaning is necessary to ensure that the printer continues to function properly throughout its life.
One area of the printer that must be cleaned periodically is the Overhead Transparency (OHT) and two-sided (duplex) printing sensor. The OHT sensor detects and ensures that the printer uses the correct print mode. The sensor also corrects for paper skew on the second side of the page during two-sided (duplex) printing.
The static discharge comb at the top of the printer also needs periodic cleaning. A brush to clean the static discharge comb is stored inside the front cover.
When to clean the OHT sensor
How to clean the OHT sensor
NOTE: If these instructions do not fix the OHT and two-sided (duplex) printing problems, click here to contact HP support .