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  1. #1
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    Sharp MX3550 error code L4-11

    Hello
    This machine is giving a juddering / clicking noise from the shift unit.. no internal finisher attached.

    I removed the shift unit and the housing around the motor had melted, causing it to deform and the motor was extremely hot...

    A replacement unit was fitted today but the issue remains..

    The unit tries to judder back to home position and randomly throws an L4-11

    I have cleaned all sensors, cleaned and greased the shifter rail and cannot feel what I would call excessive resistance..

    It sounds like gears skipping...

    Any thoughts?

    Thanks

  2. #2
    Service Manager 1,000+ Posts bilyahn's Avatar
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    Re: Sharp MX3550 error code L4-11

    Check to make sure the screw that prevents the shift assembly from moving was removed from the shift unit. It's part of the installation procedure if you do not have an inner finisher. Sounds like the motor is trying to run and the screw is preventing it from doing so. It's in an odd location. You have to removed the shift unit, turn it over and you should see a screw on the forward part of the mechanism.

    Good luck.

    Bil

  3. #3
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    Re: Sharp MX3550 error code L4-11

    The shifter unit actually appears to run freely.. nothing preventing it from moving side to side... I don't think it is one the sensors either as even in the middle position it is juddering / grinding...

  4. #4
    Senior Tech 250+ Posts spanky's Avatar
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    Re: Sharp MX3550 error code L4-11

    Remove the motor and put the shifter unit back in the machine.

    Try moving the shifter by hand and see if you have a mechanical bind.

  5. #5
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    Re: Sharp MX3550 error code L4-11

    Hello

    Did that already... seems to move freely.. but not sure how free it should be...

    Also, if you leave the motor attached you can still slide the unit and feel the motor moving.. which also does not seem to bind....

  6. #6
    Senior Tech 250+ Posts spanky's Avatar
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    Re: Sharp MX3550 error code L4-11

    PCU PWB drives the motor.

    If the shifter moves freely then the motor is not driven properly.

  7. #7
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    Sharp MX3550 error code L4-11


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    Re: Sharp MX3550 error code L4-11

    I have to second what Spanky just said. I've seen a Sharp MX3050 or 3070 burn that shift motor up because the PWB went bad, providing the wrong voltage to the motor. I'd replace both the motor and board together.

  8. #8
    The Wolf 2,500+ Posts mojorolla's Avatar
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    Re: Sharp MX3550 error code L4-11

    This is a known issue and they not only added a grounding harness, but they have also changed the PCU pwb.
    If the motor is get so hot that it is melting the plastic (yep, I have seen this melting twice!!), the PCU pwb is the cause.
    If you replace the PCU pwb on these models, remove the fuser, install the PCU, wait 10 seconds, power down, install fuser and power up.


    Failing to plan is planning to fail!!!

  9. #9
    Technician Alpanapa's Avatar
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    Re: Sharp MX3550 error code L4-11

    The exact problem is that the earth harness was not installed from the beginning on the fusing rear paper guide unit. After some use, static electricity will destroy the PCU PBW, making the PCU PBW send "Go left, go right" signal to the shift motor at the same time.

    The missing earth harness is on all machines made before mid-April 2016 production, who uses MX-TU16 (Not if they have any finisher)

    The sad part is that you have to change both shift motor and PCU PWB. And don’t forget to install the earth harness, or you may have to go back later and change the PCU PWB again

  10. #10
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    Re: Sharp MX3550 error code L4-11

    Thanks for the information.. new board ordered

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