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  1. #1
    Join Date
    Apr 2015
    Rep Power

    TASKalfa 4052ci Error codes C7901, C7903, C7904, C7911

    Hi Guys,

    I have a TASKalfa 4052ci who gives these error codes in the last month:
    C7901, C7903, C7904, C7911.
    The first and the last in this morning. Lately things are going badly...
    A couple of times error C7620.

    Service manual talks about dirty in contacts but I don't think it's my case. A poor contact on a drum must give multiple errors on the same drum.
    Here codes are rolling quickly!

    Someone has seen these errors?
    How to resolve?

    Some little printer statistics:
    About 150k prints, 118k BW and 32k color
    Firmware updated!

    Thank you in advance,

  2. #2
    Field Supervisor 500+ Posts
    TASKalfa 4052ci Error codes C7901, C7903, C7904, C7911

    copiertec's Avatar
    Join Date
    Jan 2016
    Centereach, L.I. New York
    Rep Power

    Re: TASKalfa 4052ci Error codes C7901, C7903, C7904, C7911

    Service manual does not mention dirty contacts, but it does mention to make sure all connectors are connected to start with. Being the codes are all drum and developer related, first, I would make sure you are receiving proper voltage and ground to the mfp, 2) which you already have done- update the firmware. If these do not fix your issue you could try installing another black drum/ developing unit and see if those codes are corrected. If they are not corrected after installing those parts, you are looking at board issues particularly the engine pwb.

  3. #3
    Senior Tech 100+ Posts
    Join Date
    Aug 2011
    Rep Power

    Re: TASKalfa 4052ci Error codes C7901, C7903, C7904, C7911

    1. step
    Check serialnumbers from DK units by U117 and/ or DV serialnumbers by U984
    Mostly you`ll see same serialnumber for 2 or more units.
    Now you must find broken unit by using well working other DK/ DV unit.
    2. step
    reconnect YC17 on feed image pwb, sometimes bad connections on pin B17 - B20/ missing 3,3V power supply for Eeprom communication.
    3. step
    also check YC1 on drum/ developer relay pwb pin 1-6

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