HP Color LaserJet 5550 Printer series - Manual (Page 156)

Periodic cleaning
To ensure the printer continues to function properly throughout its life, periodic cleaning is
necessary.
One area of the printer that must be cleaned periodically is the overhead transparency
(OHT) and two-sided printing (duplex) 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
● The printer control panel reports paper is being used instead of the desired transparency.
● The images on the front and back of the printed page do not align.
To clean the OHT sensor
Note If these instructions do not remedy the OHT and two-sided printing (duplex) problems,
contact HP support at
http://www.hp.com/support .
1. Lift the top cover of the printer.
2. Grasp the front cover and pull down.
142 Chapter 7 Maintenance ENWW