Laser Printer halogen heat lamps A fuser lamp failure is usually indicated by a "Service Error 50" or "50 Service" on the display of Hewlett Packard printers, an "E31" error on early Panasonic printers, a series of flashing lights on the Apple printer family and "E0003" on early Epson printers. We no longer carry Panasonic or Epson lamps. You can use an ohm meter to check the continuity of the heater lamp. Typical readings are less than 10 ohms measured on the heavy leads of the fuser assembly. An open circuit or discoloration of the lamp are sure indications of a defective heater lamp. Most newer machines use a solid state thin film heating element which should last the life of the printer. Our fuser lamps consist of original equipment manufacturer (OEM) and third party lamps. Choose Printer Manufacturer Hewlett Packard Lexmark