Updated: Nov 15, 2019
Technical Service Bulletins
HP LaserJet M601/M602/M603 Fuser DO NOT INSTALL OR REMOVE FUSER BEFORE TURNING POWER OFF. Failure to power down before installing or removing fuser wills void warranty
Your HP M601/M602/M603 fuser has been built to the highest quality standards. If you are experiencing problems with this fuser (jams, noises, poor print quality, etc.), please observe the following:
If the fuser's sleeve does not spin when you manually turn the gear, please
do not assume that the fuser will not run in the printer. At room temperature, the grease applied inside the sleeve thickens and may actually prevent the sleeve from spinning. When the fuser is installed and run in the printer, the grease will heat up and attain proper viscosity.
If you continue to experience paper jams after replacing the fuser, replace the feed/separation separation rollers (one in the paper tray and two in the bottom of the printer) and three MP tray rollers. Ensure that the paper you are printing on is within the specifications allowed by HP.
For tray one/MP tray, the paper must be between 16lb and 541b. For trays two to six, the paper must be between 161b and 361b. Be certain that both sides of the fuser are firmly locked into the printer. Listen for the two locks to snap in when you install it.
Paper Jam Solutions For Laserjet Printers
Printer Service And Parts Glossary
If the fuser is not secured, the printer may display a "50.3 FUSER ERROR" message or you may hear a grinding noise. In either of these cases, remove the fuser and reinstall it making sure that both sides are locked in place.
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