DF-704 (C368) Reads 8 1/2 x 14 original as A4

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  • SAR
    Trusted Tech

    100+ Posts
    • Jul 2009
    • 182

    DF-704 (C368) Reads 8 1/2 x 14 original as A4

    This is a weird one for me. When a legal sized original is placed on the DF feed table, the size is read as A4 instead of 8 1/2 x 14.
    Copier has latest firmware and function version. I have done the ADF width adjustment twice and checked the 2 length sensors in service mode sensor check.
    I even tried unplugging the sensors on a working feeder at the shop to see if I could duplicate the problem, but no luck.
    The customer has been able to get it to work by placing a small rubber disc about 1/2" thick on the front edge of the feed table which raises the paper up slightly
    and then it reads as 8 1/2 x 14. This had me thinking the feed table might be warped, but no matter how I twist it or torque it by hand, it still reads the size wrong.
    I will probably just swap out the feeder and fix it in the shop, but wanted to see if anyone else has run across this issue.
    I will definitely post up the fix if I don't hear from anyone first.
  • Woxner
    Senior Tech

    500+ Posts
    • Jul 2011
    • 815

    #2
    Re: DF-704 (C368) Reads 8 1/2 x 14 original as A4

    No need to swap. Ck the varister on the edge guides. The can go bad. Also do the width adjustment for the feeder if you replace the sensor

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    • tmmdmmm
      Trusted Tech

      Site Contributor
      100+ Posts
      • Apr 2021
      • 173

      #3
      Re: DF-704 (C368) Reads 8 1/2 x 14 original as A4

      Originally posted by Woxner
      No need to swap. Ck the varister on the edge guides. The can go bad. Also do the width adjustment for the feeder if you replace the sensor
      Second this. Try the min/max adjustment. Believe min is B6 and max is A3 for all Bizhub DFs
      Edit: And the 704 should have B6 and A3 listed on the sticker for a quick adjustment, although you should measure 125mm and 297mm for accuracy.

      Comment

      • SAR
        Trusted Tech

        100+ Posts
        • Jul 2009
        • 182

        #4
        Re: DF-704 (C368) Reads 8 1/2 x 14 original as A4

        The cause of the problem was a bad Document Length Sensor/1 (PS-8 part #A5C1M50100).
        Part 4 in the picture. Luckily all of the sensors in that DF-704 feed table are the same part on the DF-701, so I was able to steal the part from an old DF-701 feeder.
        Df sensor (2).jpg

        Comment

        • aberock
          Technician

          Site Contributor
          50+ Posts
          • May 2022
          • 90

          #5
          Re: DF-704 (C368) Reads 8 1/2 x 14 original as A4

          System > ADF > Width Adjustment > min/max adjustment

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