Diagnostic information 2-87Fuser service checks920.xx—Cold fuser service checkError codes 920.x and 922.xx may display for a cold fuser failure.Some 920.xx error codes may be cleared by turning the printer on and off and allowing it to complete POR.CAUTION: There is a danger from hazardous voltage in the area of the printer where you areworking. Unplug the printer before you begin, or use caution if the printer must receive power inorder to perform the task.Service tip: Some 920.xx errors can be caused by multiple sheets of paper being fed up to the fuser.Service tip: Set the Fuser Temperature to NORMAL before starting this service check. In Diagnostics mode,select EP SETUP, and Fuser Temp.Service tip: It may take several minutes for the error co des 920.xx and 922.xx to be displayed after the printer isturned on.FRU Action1 Fuser lampFuser lamp AC cableObserve the lamp through the left near side of the printer. It may benecessary to remove the redrive assembly to observe the lampturning on and off. If the lamp does not come on do the following:• If not previously removed, remove the redrive assembly. See“Redrive assembly removal” on page 4-75.• Remove the fuser assembly. See “Fuser assembly removal”on page 4-27.• Make sure the correct type of lamp is installed (voltage andwattage).• Verify that the fuser to fuser lamp cable is installed correctly tothe fuser top cover assembly. If incorrect, install correctly; ifcorrect, go to step 2.2 AC line voltage CAUTION: When taking measurements for AC power, observe allsafety precautions.Check the AC line voltage to make sure it is within operatingspecification. If incorrect, inform the customer; if correct, go to step 3.3 LVPS CAUTION: When taking measurements for AC power, observe allsafety precautions.Unplug the AC line cord from the printer and pull the LVPS out farenough to access CN1 on the LVPS board (see “Low voltagepower supply removal” on page 4-55). Disconnect the LVPS tofuser AC cable, plug in the line cord, turn the printer on and measurethe voltage between CN1-1 and CN1-3 on the connector (see theconnector locations at “Low voltage power supply” on page 5-10).If incorrect, replace the LVPS assembly (see “Low voltage powersupply removal” on page 4-55); if correct, go to step 4.4 Fuser lampFuser top cover assemblyFuser connect cable (fuserto fuser lamp cable)Check continuity of the fuser to fuser AC cable, fuser top coverassembly, and fuser lamp by checking the continuity between the twopins on the fuser lamp AC cable connector:• If there is continuity, go to step 5.• If there is no continuity, check the continuity of the fuser to fuserlamp AC cable. If incorrect, replace the lamp, if incorrect, replacethe fuser top cover assembly.Note: If the fuser lamp is replaced, allow the fuser assembly to coolor a 925.xx error may be displayed.
