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  1. #1
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    Konica minolta bizhub 284e keeps jamming in the third tray (Error 20-21)

    Hello guys
    I have a bizhub 284e that keeps jamming in the third tray (error 20-21).
    It prints fine by trays 1,2 and 4. I have checked the rollers, the sensors but no help.
    Any suggestions?

  2. #2
    Senior Tech 100+ Posts
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    Re: Konica minolta bizhub 284e keeps jamming in the third tray (Error 20-21)

    Swap all pick and feed rollers from tray 4 to tray 3, including the white and the black clutch bearing that are with the rollers and see if it works

    Sent from my motorola one 5G UW using Tapatalk

  3. #3
    Master Of The Obvious 10,000+ Posts
    Konica minolta bizhub 284e keeps jamming in the third tray (Error 20-21)

    blackcat4866's Avatar
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    Re: Konica minolta bizhub 284e keeps jamming in the third tray (Error 20-21)

    Check to see if the tray #3 exit mylar is deformed.

    If you've been already working in the back of the machine, check to see if CN3 is fully plugged in at the EXCB. During replacement of clutch CL8 it's easy to pull on the harnesses and partly unplug connector CN3.

    On the C360 I've seen a couple other things:
    The customer got a batch of paper that was 0.6mm oversized. Since tray #3 is not size adjustable the paper fit too snugly.

    Also if the inner vertical paper guide comes off it's pins you can get 20-21 jams ... but that's pretty obvious to somebody who's investigating.

    On the bizhub 423:
    I've seen slipping one-way bearings at the feed section.

    Or I've seen endusers load ledger sized paper to the tandem tray, then expect it to feed.
    =^..^=
    If you'd like a serious answer to your request:
    1) demonstrate that you've read the manual
    2) demonstrate that you made some attempt to fix it.
    3) if you're going to ask about jams include the jam code.
    4) if you're going to ask about an error code include the error code.
    5) You are the person onsite. Only you can make observations.

    blackcat: Master Of The Obvious =^..^=

  4. #4
    RTFM!! 2,500+ Posts allan's Avatar
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    Re: Konica minolta bizhub 284e keeps jamming in the third tray (Error 20-21)

    Does it work if you put pressure on the side door while testing?
    Whatever

  5. #5
    Service Manager 2,500+ Posts tsbservice's Avatar
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    Re: Konica minolta bizhub 284e keeps jamming in the third tray (Error 20-21)

    Quote Originally Posted by patrickjlc View Post
    Swap all pick and feed rollers from tray 4 to tray 3, including the white and the black clutch bearing that are with the rollers and see if it works

    Sent from my motorola one 5G UW using Tapatalk
    This is really simple and fast test that I like to use in such situations, works almost everytime. 99% of time it's either rollers or oneways/torque limiter.
    A tree is known by its fruit, a man by his deeds. A good deed is never lost, he who sows courtesy, reaps friendship, and he who plants kindness gathers love.

    Blessed are they who can laugh at themselves, for they shall never cease to be amused.

  6. #6
    Step aside, noob 1,000+ Posts EarthKmTech's Avatar
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    Re: Konica minolta bizhub 284e keeps jamming in the third tray (Error 20-21)

    in sensor check see if the vertical transport sensor is actually functional in tray 3.

    For some reason its always tray 3 that has the pins of this sensors connector get oxidised in environments that wet mop the floors. If its not responsive usually disconnection and reconnection of this sensor fixes the issue - till next time.
    If at first you don't succeed, try the way I told you how to do it in the first place.

  7. #7
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    Konica minolta bizhub 284e keeps jamming in the third tray (Error 20-21)

    DelawareJim's Avatar
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    Re: Konica minolta bizhub 284e keeps jamming in the third tray (Error 20-21)

    Jamming from tray 3 and/ or tray 4. Pull down the side door, and lightly roll upwards on the black transport roller. It should roll upwards easily. If it is hard to roll, suspect the 1-way clutch assembly located at the rear of that transport roller. To service it, remove the feed unit, remove 1 gear that is in the way, and then a c-clip and pull the assembly off. Squeeze the assembly together in your fingers (you may have to also rotate the outside white parts) and you will feel it seat. Then just reinstall the assembly onto the transport roller, but before you put on the c-clip, install a spacer washer or 2. Konica Minolta part number: A108213800. 9 bucks per at Discount Copy Center. We bought a bag of 100 from Aliexpress for 9 dollars and that included shipping. The OEM washer is between .1 and .2 mm, so we bought a bag of .1mm, .2mm, .3mm, and .5mm. This allows us to create the perfect spacer size...not too tight and at the same time no play. Store name on Aliexpres is Jason Hardware World, and the exact washers we ordered were Thickness 0.1mm Stainless steel Flat Washer Ultra thin gasket High precision Adjusting gasket M3-M40 Thin shim SUS304
    Inner Diameter: 6x12x0.1 (100pcs) The 6x12x0.1 is the important part of that. Also 6x12x0.2, 6x12x0.3, and 6x12x0.5 The entire order was 32 bucks and shipping only took about 3 weeks.
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