sharp MX-c402sc intermittant light copies

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  • driving lots of miles
    Trusted Tech

    250+ Posts
    • Jun 2016
    • 378

    sharp MX-c402sc intermittant light copies

    I have a Sharp MX-C402sc that is giving me light copies and prints very intermittently. the copier is 4 1/2 years old 410,000 copies. it has the latest firmware, it was sold new by us and all the maintenance has been done on time, OEM Sharp toner. it has new black developer and drum. Customer complaint was that it would randomly print out copies that were extremely light. Customer had samples, and it did not matter if it was a print job, through the ADF or off the glass. I was unable to duplicate on site, it was brought into the shop and only once printed out an unreadable copy. I swapped out every consumable part and could not get it to cause any more problems. We took it back and it worked great for 8 days and then started have the same problem again. It was in the shop for two weeks while they had another c402sc loaner which had no problems. Any ideas would be helpful, as they want me to bring the loaner back.
  • JR2ALTA
    Service Manager

    Site Contributor
    1,000+ Posts
    • Feb 2010
    • 2017

    #2
    Re: sharp MX-c402sc intermittant light copies

    I had that and it was the transfer belt. If you replaced it maybe look at high voltage board or main drive unit

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    • danceswrabbit
      Technician

      50+ Posts
      • Dec 2013
      • 63

      #3
      Re: sharp MX-c402sc intermittant light copies

      had a mxm465 with same symptoms. after replacing a LOT it ended up being the mfp pwb.

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      • moose55
        Trusted Tech

        Site Contributor
        100+ Posts
        • Mar 2017
        • 143

        #4
        Re: sharp MX-c402sc intermittant light copies

        Originally posted by JR2ALTA
        I had that and it was the transfer belt. If you replaced it maybe look at high voltage board or main drive unit

        I would tend to second this. You say that all consumables were replaced. Did you replace the whole primary assembly? That is where I would start. The HV contacts for this machine are just "spring and wire" contacts. There is a lot of room in them for error. That would be my starting point.
        The Moose is loose!!

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        • driving lots of miles
          Trusted Tech

          250+ Posts
          • Jun 2016
          • 378

          #5
          Re: sharp MX-c402sc intermittant light copies

          The customer traded this machine in on a new MX-3071 so we will use it for parts and not spend any more time on it.

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