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Marathon Combi 24 Nail Milling Machine: High Speed Only, Potentiometer Checked

bozo86 12792 15
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #1 16352160
    bozo86
    Level 12  
    Hello. I have a problem with the milling machine. Only high speed works. I checked the potentiometer and it works correctly but the speed does not react. After unplugging the potentiometer all the time at the highest level. What could have been damaged in this system? I will add that turn left turn right, control leg or manual also fine ... Please help what to check or what to replace ... Regards Marathon Combi 24 Nail Milling Machine: High Speed Only, Potentiometer Checked Marathon Combi 24 Nail Milling Machine: High Speed Only, Potentiometer Checked Marathon Combi 24 Nail Milling Machine: High Speed Only, Potentiometer Checked Marathon Combi 24 Nail Milling Machine: High Speed Only, Potentiometer Checked Marathon Combi 24 Nail Milling Machine: High Speed Only, Potentiometer Checked
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  • Helpful post
    #2 16352213
    dzolo35
    Level 22  
    Without measurements it is difficult to accurately suggest, but first check (replace) U1 and Q1.
  • #3 16352237
    bozo86
    Level 12  
    It is hard to mention today because the shops are closed ... I can only measure. And what should their approximate values be?

    Added after 34 [minutes]:

    Measurement...
    U1
    1-2 225om
    1-3 8-cell-14.5 cell

    Q1
    1-2 900om
    1-3 8kom-15kom
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  • Helpful post
    #4 16352410
    Adam-T
    Level 41  
    Buddy, such measurements are a matter of ... ;)
    U1 to LM317 download DS and see what it is, compare with what you have on pcb and take voltage measurements.
    Q1 can't see the inscriptions on it, but download DS and see what it is, possible measurements with a diode tester after disassembly.

    PS
    DS is a datasheet.
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  • #5 16352427
    bozo86
    Level 12  
    Thanks Adam for the tips ... You know I'm not an electronics player so I can smoke a gaff sometimes :) I will check it at work again later

    Added after 1 [hours] 59 [minutes]:

    U1
    LM317T
    V out 0.82
    V in 2.16

    Q1
    BDW93C
    V out 1.0
    V in 1.08

    Measured values on the device switched on
  • #6 16352866
    398216 Usunięty
    Level 43  
    I'm sorry to interfere - how did you measure?
    The minus probe of the meter should be connected to ground - in this case to the negative leg of this large capacitor.
  • #8 16353000
    bozo86
    Level 12  
    I desoldered the transistors and checked the diode tester ... Incorrect values. Tomorrow I will buy new and solder. Will write or work. Thanks for your help and interest.
  • #9 16353023
    Adam-T
    Level 41  
    LM317 is not a transistor! His doesn't work that way.
  • #10 16353107
    bozo86
    Level 12  
    And how? Because maybe I checked wrong ...
  • #11 16353119
    Adam-T
    Level 41  
    In the system by measuring voltages. Here a colleague wrote.
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  • #12 16353852
    bozo86
    Level 12  
    I solder new U1 and U2. Turnover still only high. Where can the problem be?
  • #13 16353912
    Adam-T
    Level 41  
    You've already got hints that you have to take voltage measurements, you also got hints on how to do it correctly:
    398216 Usunięty wrote:
    The minus probe of the meter should be connected to ground - in this case to the negative leg of this large capacitor.

    Measure this voltage for now only on the LM317, check if the voltage on the OUT leg changes as you turn the potentiometer.
    bozo86 wrote:
    leg or manual control also fine ...

    Write something more about it. What is this control?
  • #14 16353979
    398216 Usunięty
    Level 43  
    Adam-T wrote:
    What is this control?
    Most likely ON / OFF and change of direction of rotation.
  • Helpful post
    #15 16354977
    dzolo35
    Level 22  
    Desolder R3 and R4 and check if it is regulated by the potentiometer, the voltage on the LM317 middle foot, how you checked the potentiometer, and what the R range is.
    Desolder one leg of each R, measure and write us the resistance.
    Desolder and check VR1.
    Take a good photo of the tile from the paths side so that I can see what it connects to.
  • #16 16358519
    bozo86
    Level 12  
    Wiajcie. After replacing U1 and Q1, the speed was high all the time. According to your suggestions, I checked everything once more and it turned out that the R3 resistor is also damaged and the potentiometer once worked correctly and once not. After replacing all the elements, the speed control works as it should ... Thanks to everyone for help and advice :)
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Topic summary

The discussion revolves around a malfunction in the Marathon Combi 24 Nail Milling Machine, where only high speed is operational despite the potentiometer being checked and functioning correctly. Users suggest checking components U1 (LM317) and Q1 (BDW93C) for potential damage, as well as measuring voltages to diagnose the issue. The author provides measurements indicating that both U1 and Q1 were replaced, but the problem persisted until it was discovered that the R3 resistor was also faulty. After replacing all damaged components, the speed control functioned correctly.
Summary generated by the language model.
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