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Solved R1+ Shutting off

Discussion in 'Troubleshooting' started by JakeMoore, Mar 9, 2019.

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  1. JakeMoore

    JakeMoore New Member

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    My R1+ recently started shutting off after a few minutes of use. In my uneducated opinion, it seems like getting the extruder up to operating temperature puts a strain on the machine and causes it to shut down. When the extruder starts to heat up, the LEDs start to flicker, and then it shuts off. After a short amount of time, it will turn back on by itself.

    I recently replaced the psu, hoping that would solve the problem. When I took the factory psu out, the #2 terminal was charred. I'm not sure if that's related.

    ===================
    Update - 22 April 2019

    It's fixed! For a total of about $50, I've got a working printer again.

    Here's a list of everything I did to solve the problem:

    1) Replace power supply.
    2) Replace control board (keep stock arduino) with kit (control board + stepper drivers). Added bonus of a gaining the reprap full graphics screen.
    3) Flash latest firmware onto arudino.
    4) Re-wire LEDs and fans to the green plug on the control board.
     
    #1 JakeMoore, Mar 9, 2019
    Last edited: Apr 22, 2019
  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Possibly related. Check the GCode terminal in whatever host software you are using for errors. Look all the way back to the point where you connected the printer/turned it on and search for the word ERROR. Tell us what errors you find, we can work with that :)
     
  3. JakeMoore

    JakeMoore New Member

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    It doesn't report an error. The GCode keeps updating as if the machine were still on. I forgot to mention that replacing the psu did not solve the issue, but I'm going to keep the new one in there.

    Here's what it says

    Code:
    Attempting connection at /dev/cu.usbmodem141110...
    READ: start
      Connected to machine!
    READ: echo:Marlin1.0.0
    Marlin1.0.0
    SENT: T0
    READ: echo: Last Updated: Jul 11 2016 12:52:10 | Author: (RoBo 3D, R1+ Single Extruder)
    Last Updated: Jul 11 2016 12:52:10 | Author: (RoBo 3D, R1+ Single Extruder)
    READ: Compiled: Jul 11 2016
    READ: echo: Free Memory: 3757  PlannerBufferBytes: 1232
    Free Memory: 3757  PlannerBufferBytes: 1232
    READ: echo:Stored settings retrieved
    Stored settings retrieved
    SENT: M105
    READ: echo:SD init fail
    SD init fail
    READ: echo:Active Extruder: 0
    Active Extruder: 0
    READ: ok
    READ: ok T:18.6 /0.0 B:20.5 /0.0 T0:18.6 /0.0 @:0 B@:0
    SENT: M105
    READ: ok T:18.7 /0.0 B:20.6 /0.0 T0:18.7 /0.0 @:0 B@:0
    SENT: M105
    READ: ok T:18.7 /0.0 B:20.5 /0.0 T0:18.7 /0.0 @:0 B@:0
    SENT: M105
    READ: ok T:18.7 /0.0 B:20.6 /0.0 T0:18.7 /0.0 @:0 B@:0
    SENT: M105
    READ: ok T:18.7 /0.0 B:20.6 /0.0 T0:18.7 /0.0 @:0 B@:0
    SENT: M105
    READ: ok T:18.7 /0.0 B:20.6 /0.0 T0:18.7 /0.0 @:0 B@:0
    SENT: M105
    READ: ok T:18.7 /0.0 B:20.6 /0.0 T0:18.7 /0.0 @:0 B@:0
    SENT: M105
    READ: ok T:18.7 /0.0 B:20.6 /0.0 T0:18.7 /0.0 @:0 B@:0
    SENT: M105
    READ: ok T:18.7 /0.0 B:20.6 /0.0 T0:18.7 /0.0 @:0 B@:0
    SENT: M105
    READ: ok T:18.7 /0.0 B:20.6 /0.0 T0:18.7 /0.0 @:0 B@:0
    SENT: M105
    READ: ok T:18.7 /0.0 B:20.6 /0.0 T0:18.7 /0.0 @:0 B@:0
    SENT: M105
    READ: ok T:18.7 /0.0 B:20.6 /0.0 T0:18.7 /0.0 @:0 B@:0
    SENT: M105
    READ: ok T:18.7 /0.0 B:20.6 /0.0 T0:18.7 /0.0 @:0 B@:0
    SENT: M105
    READ: ok T:18.7 /0.0 B:20.6 /0.0 T0:18.7 /0.0 @:0 B@:0
    SENT: M105
    READ: ok T:18.7 /0.0 B:20.6 /0.0 T0:18.7 /0.0 @:0 B@:0
    SENT: G90
    SENT: M82
    SENT: M106 S0
    SENT: M140 S60
    SENT: M190 S60
    READ: ok
    READ: ok
    READ: ok
    READ: ok
    READ: T:18.75 E:0 B:20.6
    READ: T:18.75 E:0 B:20.6
    READ: T:18.75 E:0 B:20.6
    READ: T:18.75 E:0 B:20.6
    READ: T:18.75 E:0 B:20.6
    READ: T:18.75 E:0 B:21.2
    READ: T:18.75 E:0 B:21.9
    READ: T:18.75 E:0 B:22.5
    READ: T:18.75 E:0 B:23.1
    READ: T:18.75 E:0 B:23.7
    READ: T:18.75 E:0 B:24.4
    READ: T:18.75 E:0 B:25.0
    READ: T:18.75 E:0 B:25.5
    READ: T:18.75 E:0 B:25.6
    READ: T:18.75 E:0 B:25.9
    READ: T:18.75 E:0 B:26.4
    READ: T:18.75 E:0 B:26.8
    READ: T:18.75 E:0 B:27.0
    READ: T:18.75 E:0 B:27.3
    READ: T:18.75 E:0 B:27.7
    READ: T:18.75 E:0 B:28.1
    READ: T:18.75 E:0 B:28.2
    READ: T:18.71 E:0 B:28.6
    READ: T:18.75 E:0 B:28.9
    READ: T:18.75 E:0 B:29.1
    READ: T:18.75 E:0 B:29.5
    READ: T:18.75 E:0 B:29.7
    READ: T:18.75 E:0 B:30.0
    READ: T:18.75 E:0 B:30.4
    READ: T:18.75 E:0 B:30.4
    READ: T:18.75 E:0 B:30.8
    READ: T:18.75 E:0 B:31.0
    READ: T:18.75 E:0 B:31.2
    READ: T:18.75 E:0 B:31.7
    READ: T:18.75 E:0 B:31.7
    READ: T:18.75 E:0 B:32.1
    READ: T:18.75 E:0 B:32.4
    READ: T:18.75 E:0 B:32.5
    READ: T:18.75 E:0 B:32.9
    READ: T:18.75 E:0 B:32.9
    READ: T:18.75 E:0 B:33.3
    READ: T:18.75 E:0 B:33.7
    READ: T:18.75 E:0 B:33.7
    READ: T:18.75 E:0 B:34.2
    READ: T:18.75 E:0 B:34.4
    READ: T:18.75 E:0 B:34.6
    READ: T:18.75 E:0 B:35.0
    READ: T:18.75 E:0 B:35.1
    READ: T:18.75 E:0 B:35.3
    READ: T:18.75 E:0 B:35.7
    READ: T:18.75 E:0 B:35.7
    READ: T:18.75 E:0 B:36.0
    READ: T:18.75 E:0 B:36.3
    READ: T:18.75 E:0 B:36.3
    READ: T:18.75 E:0 B:36.7
    READ: T:18.75 E:0 B:36.9
    READ: T:18.75 E:0 B:37.0
    READ: T:18.75 E:0 B:37.3
    READ: T:18.75 E:0 B:37.6
    READ: T:18.75 E:0 B:37.7
    READ: T:18.75 E:0 B:38.0
    READ: T:18.75 E:0 B:38.2
    READ: T:18.75 E:0 B:38.3
    READ: T:18.75 E:0 B:38.7
    READ: T:18.75 E:0 B:38.8
    READ: T:18.75 E:0 B:39.0
    READ: T:18.75 E:0 B:39.3
    READ: T:18.75 E:0 B:39.4
    READ: T:18.75 E:0 B:39.7
    READ: T:18.75 E:0 B:40.0
    READ: T:18.75 E:0 B:40.2
    READ: T:18.75 E:0 B:40.3
    READ: T:18.75 E:0 B:40.6
    READ: T:18.75 E:0 B:40.7
    READ: T:18.75 E:0 B:40.9
    READ: T:18.79 E:0 B:41.2
    READ: T:18.79 E:0 B:41.3
    READ: T:18.79 E:0 B:41.5
    READ: T:18.75 E:0 B:41.8
    READ: T:18.79 E:0 B:42.0
    READ: T:18.79 E:0 B:42.1
    READ: T:18.75 E:0 B:42.4
    READ: T:18.83 E:0 B:42.6
    READ: T:18.87 E:0 B:42.6
    READ: T:18.75 E:0 B:42.9
    READ: T:18.83 E:0 B:43.2
    READ: T:18.83 E:0 B:43.2
    READ: T:18.79 E:0 B:43.5
    READ: T:18.79 E:0 B:43.8
    READ: T:18.83 E:0 B:43.9
    READ: T:18.83 E:0 B:44.1
    READ: T:18.98 E:0 B:44.4
    READ: T:19.06 E:0 B:44.7
    READ: T:18.87 E:0 B:44.7
    READ: T:18.98 E:0 B:45.0
    READ: T:18.91 E:0 B:45.3
    READ: T:18.95 E:0 B:45.5
    READ: T:18.98 E:0 B:45.5
    READ: T:19.02 E:0 B:45.8
    READ: T:19.10 E:0 B:46.1
    READ: T:18.98 E:0 B:46.1
    READ: T:19.02 E:0 B:46.3
    READ: T:19.02 E:0 B:46.6
    READ: T:18.95 E:0 B:46.8
    READ: T:19.10 E:0 B:46.8
    READ: T:19.10 E:0 B:47.1
    READ: T:19.10 E:0 B:47.4
    READ: T:19.10 E:0 B:47.6
    READ: T:19.18 E:0 B:47.6
    READ: T:19.10 E:0 B:47.9
    READ: T:19.10 E:0 B:48.2
    READ: T:19.18 E:0 B:48.2
    READ: T:19.18 E:0 B:48.4
    READ: T:19.26 E:0 B:48.7
    READ: T:19.18 E:0 B:48.9
    READ: T:19.30 E:0 B:49.0
    READ: T:19.30 E:0 B:49.2
    READ: T:19.26 E:0 B:49.5
    READ: T:19.30 E:0 B:49.7
    READ: T:19.30 E:0 B:49.9
    READ: T:19.34 E:0 B:50.0
    READ: T:19.37 E:0 B:50.2
    READ: T:19.37 E:0 B:50.5
    READ: T:19.37 E:0 B:50.6
    READ: T:19.37 E:0 B:50.7
    READ: T:19.37 E:0 B:50.9
    READ: T:19.37 E:0 B:51.1
    READ: T:19.37 E:0 B:51.3
    READ: T:19.37 E:0 B:51.4
    READ: T:19.37 E:0 B:51.6
    READ: T:19.37 E:0 B:51.8
    READ: T:19.37 E:0 B:52.0
    READ: T:19.37 E:0 B:52.0
    READ: T:19.37 E:0 B:52.3
    READ: T:19.37 E:0 B:52.5
    READ: T:19.37 E:0 B:52.7
    READ: T:19.37 E:0 B:52.8
    READ: T:19.37 E:0 B:53.0
    READ: T:19.37 E:0 B:53.2
    READ: T:19.37 E:0 B:53.4
    READ: T:19.37 E:0 B:53.5
    READ: T:19.37 E:0 B:53.6
    READ: T:19.37 E:0 B:53.9
    READ: T:19.37 E:0 B:54.1
    READ: T:19.37 E:0 B:54.3
    READ: T:19.37 E:0 B:54.3
    READ: T:19.37 E:0 B:54.5
    READ: T:19.37 E:0 B:54.8
    READ: T:19.37 E:0 B:55.0
    READ: T:19.37 E:0 B:55.1
    READ: T:19.37 E:0 B:55.2
    READ: T:19.37 E:0 B:55.4
    READ: T:19.37 E:0 B:55.6
    READ: T:19.37 E:0 B:55.8
    READ: T:19.37 E:0 B:55.8
    READ: T:19.37 E:0 B:56.0
    READ: T:19.37 E:0 B:56.2
    READ: T:19.37 E:0 B:56.4
    READ: T:19.37 E:0 B:56.5
    READ: T:19.37 E:0 B:56.7
    READ: T:19.37 E:0 B:56.9
    READ: T:19.34 E:0 B:57.1
    READ: T:19.37 E:0 B:57.1
    READ: T:19.37 E:0 B:57.3
    READ: T:19.37 E:0 B:57.5
    READ: T:19.37 E:0 B:57.7
    READ: T:19.37 E:0 B:57.7
    READ: T:19.37 E:0 B:57.9
    READ: T:19.37 E:0 B:58.1
    READ: T:19.37 E:0 B:58.3
    READ: T:19.37 E:0 B:58.4
    READ: T:19.37 E:0 B:58.5
    READ: T:19.37 E:0 B:58.7
    READ: T:19.37 E:0 B:59.0
    READ: T:19.37 E:0 B:59.0
    READ: T:19.37 E:0 B:59.2
    READ: T:19.37 E:0 B:59.4
    READ: T:19.37 E:0 B:59.6
    READ: T:19.37 E:0 B:59.8
    READ: T:19.37 E:0 B:59.9
    READ: ok
    SENT: M105
    SENT: G28
    SENT: G29
    SENT: G1 Z5 F5000
    SENT: M109 S210
    READ: ok T:19.4 /0.0 B:60.0 /60.0 T0:19.4 /0.0 @:0 B@:127
    READ: ok
    READ: X:120.00 Y:127.00 Z:-1.00 E:0.00 Count X: 120.00 Y:127.00 Z:-1.00
    READ: ok
    SENT: M105
    READ: Bed x: 15.00 y: 20.00 z: -1.03
    READ: Bed x: 110.00 y: 20.00 z: -1.08 <<< Shut off around here
    READ: Bed x: 205.00 y: 20.00 z: -1.07
    READ: Bed x: 205.00 y: 125.00 z: -11.00
    READ: Bed x: 110.00 y: 125.00 z: -11.00
    READ: Bed x: 15.00 y: 125.00 z: -11.00
    READ: Bed x: 15.00 y: 230.00 z: -11.00
    READ: Bed x: 110.00 y: 230.00 z: -11.00
    READ: Bed x: 205.00 y: 230.00 z: -11.00
    READ: Eqn coefficients: a: -0.00 b: -0.05 d: -1.76
    READ: planeNormal x: 0.00 y: 0.05 z: 1.00
    READ: X:205.00 Y:230.26 Z:-1.00 E:0.00 Count X: 205.00 Y:229.96 Z:-11.90
    READ: ok
    SENT: M105
    READ: echo:endstops hit:  Z:-1.07
    endstops hit:  Z:-1.07
    READ: T:20.5 E:0 W:?
    READ: T:20.6 E:0 W:?
    READ: T:20.5 E:0 W:?
    READ: T:20.6 E:0 W:?
    READ: T:20.5 E:0 W:?
    READ: T:20.6 E:0 W:?
    READ: T:20.6 E:0 W:?
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    READ: T:20.6 E:0 W:?
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    READ: T:20.7 E:0 W:?
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    READ: T:20.7 E:0 W:?
    READ: T:20.6 E:0 W:?
    READ: T:20.6 E:0 W:?
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    READ: T:20.8 E:0 W:?
    READ: T:20.6 E:0 W:?
    READ: T:20.6 E:0 W:?
    READ: T:20.6 E:0 W:?
    READ: T:20.8 E:0 W:?
    READ: T:20.7 E:0 W:?
    READ: T:20.7 E:0 W:?
    READ: T:20.9 E:0 W:?
    READ: T:21.1 E:0 W:?
    READ: T:20.7 E:0 W:?
    READ: T:20.9 E:0 W:?
    READ: T:20.9 E:0 W:?
    READ: T:21.0 E:0 W:?
    READ: T:21.0 E:0 W:?
    READ: T:20.8 E:0 W:?
    READ: T:20.9 E:0 W:?
    READ: T:21.0 E:0 W:?
    READ: T:21.1 E:0 W:?
    READ: T:21.0 E:0 W:?
    READ: T:21.0 E:0 W:?
    READ: T:21.1 E:0 W:?
    READ: T:21.0 E:0 W:?
    READ: T:21.1 E:0 W:?
    READ: T:21.1 E:0 W:?
    READ: T:21.1 E:0 W:?
    READ: T:21.1 E:0 W:?
    READ: T:21.2 E:0 W:?
    READ: T:21.2 E:0 W:?
    READ: T:21.2 E:0 W:?
    READ: T:21.2 E:0 W:?
    READ: T:21.1 E:0 W:?
    READ: T:21.3 E:0 W:?
    READ: T:21.9 E:0 W:?
    READ: T:22.6 E:0 W:?
    READ: T:23.7 E:0 W:?
    READ: T:25.0 E:0 W:?
    READ: T:26.1 E:0 W:?
    READ: T:27.5 E:0 W:?
    READ: T:28.9 E:0 W:?
    READ: T:30.8 E:0 W:?
    READ: T:32.5 E:0 W:?
    READ: T:34.3 E:0 W:?
    READ: T:36.2 E:0 W:?
    READ: T:38.1 E:0 W:?
    READ: T:39.9 E:0 W:?
    READ: T:41.8 E:0 W:?
    READ: T:43.9 E:0 W:?
    READ: T:45.8 E:0 W:?
    READ: T:47.8 E:0 W:?
    READ: T:50.0 E:0 W:?
    READ: T:51.7 E:0 W:?
    READ: T:53.8 E:0 W:?
    READ: T:55.8 E:0 W:?
    READ: T:57.6 E:0 W:?
    READ: T:59.8 E:0 W:?
    READ: T:61.5 E:0 W:?
    READ: T:63.5 E:0 W:?
    READ: T:65.5 E:0 W:?
    READ: T:67.3 E:0 W:?
    READ: T:69.3 E:0 W:?
    READ: T:71.3 E:0 W:?
    Total build time: 5.12 minutes
    READ: T:73.0 E:0 W:?
    SENT: M105
    READ: T:75.1 E:0 W:?
    READ: T:77.1 E:0 W:?
    SENT: M105
    READ: T:78.9 E:0 W:?
    READ: T:81.0 E:0 W:?
    SENT: M105
    READ: T:83.0 E:0 W:?
    READ: T:84.8 E:0 W:?
    SENT: M105
    READ: T:86.8 E:0 W:?
    READ: T:88.4 E:0 W:?
    SENT: M105
    READ: T:90.3 E:0 W:?
    READ: T:92.2 E:0 W:?
    SENT: M105
    READ: T:93.8 E:0 W:?
    READ: T:95.7 E:0 W:?
    SENT: M105
    READ: T:97.5 E:0 W:?
    READ: T:99.1 E:0 W:?
    SENT: M105
    READ: T:100.9 E:0 W:?
    READ: T:102.7 E:0 W:?
    READ: T:104.3 E:0 W:?
    READ: T:106.1 E:0 W:?
    READ: T:107.9 E:0 W:?
    READ: T:109.5 E:0 W:?
    READ: T:111.4 E:0 W:?
    READ: T:113.2 E:0 W:?
    READ: T:114.8 E:0 W:?
     
  4. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
    Staff Member

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    Hmm, usually this is due to Marlin (the firmware) seeing an error and bringing the machine down.
    When it does that it will report an error. If that is not happening then something more fundamental is wrong.
    You have replaced the power supply take a look at the electronics. If the terminal for the power supply end of the wires was charred it is likely the RAMPS (the top card on the stack of electronics where the power wires go to) is also damaged and perhaps even the Arduino (the computer controller card -- bottom of the stack of boards).

    See if you can see any damage visually on the boards/connectors.
     
  5. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
    Staff Member

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    Not sure how you feel about digging into it :)
    My opinion would be to just get one of the all-in-one kits for the electronics (here is an example, not a recommendation for a specific seller, look around there are several) and just swap the electronics. The Arduino, the RAMPS 1.4, the stepper driver cards (little cards on top of the RAMPS board) and then reload the firmware (the FAQ link top of this forum has some details on how to do that). Be certain that you know the actual model of the printer -- you said R1+ -- because the beta, the R1 and the R1+ look very much the same, but the firmware is different. If yours is a recent printer it probably is the R1+ (but be sure you know).

    If that sorts it later you can experiment and bench test the boards if you really want to and determine exactly what is wrong, but this should get you back up quicker

    (links embedded into above for your convenience)
     
    #5 mark tomlinson, Mar 10, 2019
    Last edited: Mar 11, 2019
  6. JakeMoore

    JakeMoore New Member

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    Yes, it's an R1+. I'm sure.

    I've replaced a couple of the RAMPS before, so I'm not afraid to dig up in there. I pulled out each one and inspected it, as well as the connection on the board. Nothing looked damaged. I ordered a new set of RAMPS right before checking this thread. I'll replace all those first and see if that fixes anything. If not I'll try flashing the firmware. If that still doesn't help, I'll go for a complete replacement kit. Thanks!

    Please leave the thread open until I've resolved so that I can follow up and post the solution.
     
  7. Geof

    Geof Volunteer Moderator
    Staff Member

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    are you certain the fan under the printer is running all the time? A lights out under load is typically that fan, a power supply, board issue (in that order)

    If you forgot to hook up (or it fell off) that small fan connection it will cause you all sorts of grief on the R1+ models (and older models- but R1+ was more often reported as the bottom has a cover)
     
  8. JakeMoore

    JakeMoore New Member

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    Update:
    I replaced all the ramps and did a test print. It still shut off during the bed leveling while heating the extruder.

    I then unscrewed the bottom plate and started a print to check if the fan was spinning the whole time. I also put a big desk fan underneath, pointed at the arduino. This seemed to help, because it was able to print for about 5 minutes after the leveling and extruder heating up. After about 5 minutes of printing, it shut off though.

    Throughout the whole process, it seems like the machine is struggling .The LEDs are flickering a lot, and the extruder fan sounds like it might shut off at any moment.

    Would you guys suggest a new arduino as the next step?
     
  9. Geof

    Geof Volunteer Moderator
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    It’s possible but it really sounds like it’s overheating and shutting down. What voltage is your new power supply and what’s it actually outputting ?
     
  10. JakeMoore

    JakeMoore New Member

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  11. Geof

    Geof Volunteer Moderator
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    To measure to output you would need a voltmeter set to dc voltage and touch the red probe to the positive lug and the black lead to the negative.

    I use that same power supply so probably fine.

    You can certainly change the arduino, they are cheap enough to try it.
     
  12. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Because 'Murica!
    Our house line voltage is really somewhere between 110vac and 120vac :) IF YOU ARE LUCKY ...
     
  13. JakeMoore

    JakeMoore New Member

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    lol, what I meant was the photo on amazon has a sticker that reads "115v" while my actual unit has one that reads "110v".

    I've ordered the complete replacement kit. I'll go through that whole ordeal and update you all.
     
  14. BrooklynBay

    BrooklynBay Active Member

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    I had this issue a while ago. The extruder couldn't maintain the correct amount of heat because the voltage coming out of the power supply was a little low. I tested the power supply with my voltmeter, and it could barely maintain 12 volts without a load. When everything is on, the voltage would drop even more. The hot end wasn't maintaining the temperature which the slicer set it to, and then it would shut down the slicer with an error message. I turned the set screw up on the power supply, and that was it. Get a cheap multimeter from Harbor Freight. They have coupons for a free meter with any purchase. It's not the best quality but where else could you find a free multimeter with a battery & test leads?
     
  15. JakeMoore

    JakeMoore New Member

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    Sorry, what exactly do you mean by this? My power supply has a switch to go from 110v to 120v. Not sure what you mean by "set screw".

    I'll grab a voltmeter tonight.
     
    #15 JakeMoore, Mar 19, 2019
    Last edited: Mar 19, 2019
  16. BrooklynBay

    BrooklynBay Active Member

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    The power supply has an internal potentiometer which allows you to fine tune the voltage output.
     
  17. JakeMoore

    JakeMoore New Member

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    Do you have a visual aid for that? haha
     
  18. BrooklynBay

    BrooklynBay Active Member

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    Take a look at the power supply. You will see a small hole just large enough for a screwdriver to fit into. Look inside for a small disc with a flat slot.
     
  19. JakeMoore

    JakeMoore New Member

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    Thanks, I'll take a look after work. I'm assuming clockwise == higher, counter-clockwise == lower?
     
  20. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Depends on the unit if you look at this pic you can almost see one on the left. Look at your power supply. Some are on the sides...

    51A6kTWZYeL.jpg
     
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