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  1. #31
    Senior Tech 100+ Posts CopierNerd's Avatar
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    Re: bizhub 423, 93-10 , Duplex/Switch Back

    Quote Originally Posted by blackcat4866 View Post
    Congratulations on your success. Exploratory surgery is a reasonable solution. Surprisingly often you can solve an issue without actually knowing what you fixed. =^..^=
    Allan! ITS BACK!

    I am afraid, Its back! Jamming in Duplex. Lubricating the duplex bushing, motor and belts was not long lasting.

  2. #32
    Senior Tech 250+ Posts mjunkaged's Avatar
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    Re: bizhub 423, 93-10 , Duplex/Switch Back

    Quote Originally Posted by allan View Post
    Ok got it MacGuyver fixed by removing pressure from the exit driven rollers where the switchback motor was holding the edge of the paper!
    Melted a paperclip thru from the bottom hooked it over the shaft pulled the shaft down and bent the paperclip to hold its position.

    Not a fan of these kind of fixes but can't work my head around why it happend.
    Other things i tried was changing the sensor flat lenght by adding to it and the sensor position with no luck.

    Did clean all of the shafts and there is no strain on the duplex drive.
    Copiernerd: Maybe his fix will work on yours?

  3. #33
    RTFM!! 2,500+ Posts allan's Avatar
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    Re: bizhub 423, 93-10 , Duplex/Switch Back

    Quote Originally Posted by mjunkaged View Post
    Copiernerd: Maybe his fix will work on yours?
    That actually worked! Will take a pic of the fix on my next call. 30 000 prints later...

    Now the machine right next to it (also running duplex in the millions) decided to start frying the duplex motor driver chips on the control board!
    Just to much strain on the drive heats up the driver IC to where it fries. Need new door...
    Two boards later i now have resorted to changing the IC out and installing a fan right on top of it.
    BD63885EFV stepper driver IC. With no data sheets anywhere!!! 28 pin MSOP.
    Still can't believe i pulled that off by hand removing from donor board using switchback IC and replacing it.

    IMG-20190303-WA0009.jpg

    How that tinny little thing is suppose to handle 1.5A of current blows my mind!
    Last edited by allan; 03-03-2019 at 09:22 PM.
    Whatever

  4. #34
    RTFM!! 2,500+ Posts allan's Avatar
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    Re: bizhub 423, 93-10 , Duplex/Switch Back

    Well here is the pics.
    Check that sexy glue gun job. Does the business of not replacing the entire door. Darn driven roller housings...
    Sure i could mod that but that machine needs to go, it puts up a display!
    Wish i could get one but so far no luck.

    Used that pinterest thing yuck. But have an account and don't want the CTN upload to butcher the quality.
    Pin by Allan on Copier Stuff | Pinterest
    Pin by Allan on Copier Stuff | Pinterest
    Last edited by allan; 03-05-2019 at 08:47 PM.
    Whatever

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