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HP LaserJet Hot Swap/Removal Fuser Replacement Dangers

Author: Reference Number: AA-03771 Views: 11917 Created: 06-15-2011 10:21 am Last Updated: 06-15-2011 10:21 am 100 Rating/ 5 Voters




      When removing or installing the fuser in these printers the power should be off. If the printer has jammed and the fuser needs to be removed to clear the jam the printer’s power should be off as well. The hot swapping or replacing of the fuser can destroy the fuser’s heating elements, thermistors and even the power supply of the printer. The newer fusers with the instant on technology need to be started up the way they were intended to be. The turning on of the switch to provide the proper startup is critical. The power is provided to the heating element in a regulated way from the supply. If the printer is on when the fuser is installed it is subject to the full output of the supply at once. This surge or spike will wreak havoc on the heating elements. These are not the same as the older technology of the quartz lamp in the heat roller which gradually warmed up until the fuser came up to the proper temperature. Printers using this method might take a few minutes to come up to temperature from a cold start. It was also important and recommended from the manufacture’s to have the power off when replacing the fuser on these printer’s as well to curtail the risk of damage to the fuser and power supply or other electrical components.


      The heating elements in these fusers are more like a conventional light bulb using a metal strip as the heater much like the way a light bulb works. The current is run through a wire as it heats, resistance is created and light is emitted. The heating element in these fusers does not create any light though. When light bulbs fail it’s not when they are on its when they are turned on. The surge of electricity through the element causes it to fry or break apart. Once the bulb is on it generally keeps working. They can burn out while already on but for the most part it’s when they are first turned on. When you compare this to the heating element in these fusers it becomes clear as to why the printer needs to be off when replacing the fuser to avoid the surge of  current through the heating element causing it to burn out and generate the 50.X errors. These fusers operate on 110 volts AC. The hot swap with full power should be avoided when replacing, removing to clear jams, or for any other reason the fuser needs to be removed. This will help the avoidable and unnecessary fuser replacement caused by not following the manufacturer’s  recommended replacement procedures. Having the power off will also avoid damaging a fuser right out of the box which does not look good for everyone involved.