When you power up the machine and it goes through its cycle, one of the indicator lights stays on
HP LaserJet 2550L Printer panel indicates 4 LED's for 4 toner cartridges, 1LED for the Drum unit. one LED for the power on button. one of the cartridges or the Drum unit has a problem, it indicates from the lights shows on or flashing. By referring to the indication lights you can diagnose the problem contains in one of the cartridges or the drum unit. By replacing the appropriate item you'll be able to make the printer to the working condition.
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