When printing on transparencies, use the following guidelines:
Handle transparencies using the edges. Oils from your fingers deposited on the transparency can cause print quality problems.
Use only overhead transparencies recommended for use in this printer. Hewlett-Packard recommends using HP Color LaserJet Transparencies with this printer. HP products are designed to work together for optimum printing results.
In either the software application or the printer driver, select TRANSPARENCY as the media type, or print from a tray that is configured for transparencies.
Transparencies not designed for LaserJet printing will melt in the printer, causing damage to the printer. Do not use transparencies designed for monochrome printing.
HP 3550 3700 Transparencies