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hp Color Laserjet 4500 drum life reset

Discussion in 'Electronic Repair' started by Andy Cuffe, Jul 25, 2006.

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  1. Andy Cuffe

    Andy Cuffe Guest

    I own an old hp color Laserjet 4550 that's been giving me the "drum
    life low" warning for ages. This morning it finally changed to "drum
    life out" and stopped printing in the middle of a very important (and
    long) print job. Once it's out, there's no way to continue even if
    the print quality is fine.

    After finding nothing on Google about resetting the drum counter, I
    decided to dig into the drum. The drum keeps track of the pages on a
    93C46 serial EEPROM mounted behind the 8 pin connector on the left
    side of the drum. I got to this EEPROM and lifted the clock pin (pin
    2) and reinstalled it. I was pleasantly surprised to find that the
    printer calibrated and finished printing my document fine. It now
    displays "drum error, replace kit", but it still prints. I guess it's
    set to continue printing if the EEPROM fails.

    I don't know how long this will work for, but it's working great so
    far. This will probably work for similar hp printers like the CLJ
  2. Good info!

    - Mike
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