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Bad life fitness 93TI treadmill motor control board.

Discussion in 'Troubleshooting and Repair' started by Ck85abc, Jul 17, 2020.

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  1. Ck85abc

    Ck85abc

    4
    0
    Jul 17, 2020
    In particular for a life fitness 93TI treadmill. I think I have it figured out but can't seem to remove the cuicut board from the mounting frame/heat sink. So I can't get to the back side to test/remove components. If anyone is able to help out with advice on how to remove it would be much appreciated.

    Treadmill does not turn on. Treadmill was working then I moved to another room and it won't turn on. I checked all fuses and reset switches. No display or anything. I have 240 VAC going to the board. But I'm assuming the display works on DCV. There is a component on the board labeled 10A 250V AC / 10A 30V DC. Also a 250 VAC relay. So I'm guessing one of those components is bad.

    Control board number: a080-92303-f000 Rev.G



    Fyi, I've never done any electronics repair and there is no one in town that does this.

    Any ideas how I remove board from frame/heat sink?



    Images are two posts down.
     
    Last edited: Jul 17, 2020
  2. Martaine2005

    Martaine2005

    2,911
    796
    May 12, 2015
    Resize the pictures and try again.
    You’ll get that error when it’s too big.
    Or try copy and paste into the text window.

    Martin
     
    Ck85abc likes this.
  3. Ck85abc

    Ck85abc

    4
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    Jul 17, 2020
    Here are the photos.

    Last photo is of the area right above that circuitry attaching PCB to heat sink.
     

    Attached Files:

  4. Martaine2005

    Martaine2005

    2,911
    796
    May 12, 2015
    The finned heatsink, can you see any screws going through/towards the main pcb?.
    There is the (white block) an IGBT module. It might be secured directly to the heatsink plus thermal compound.

    Remove all screws from stand-offs sandwiched between pcb and aluminium panel.

    I can’t see clearly but there seems to be another component on the aluminium panel too. Check for a fixing through the bottom as well.

    You should be closer to removing the board now. The thermal paste holding these components down may need a gentle nudge to free/separate them from the panel.

    Martin
     
  5. Ck85abc

    Ck85abc

    4
    0
    Jul 17, 2020
    Martin,

    There is another component on the aluminum panel, but there is a hole on the PCB to access a screw for that component and that component will come with the PCB.

    The Allen key screws are between the PCB and aluminum pannel appearing to be holding the sandwiched component in place. The screws are going into the heatsink without clearance to access them. Maybe theres a special tool to access screws? I guess I'll cut an Allen key to try to remove bolts.
     
  6. Martaine2005

    Martaine2005

    2,911
    796
    May 12, 2015
    You can certainly try cutting one to see.
    An easy solution for some would be to de-solder the pins from the pcb and lift it off the component.
    But try your idea first. It may be quite easy once cut.

    Martin
     
  7. Ck85abc

    Ck85abc

    4
    0
    Jul 17, 2020
    I was thinking I needed to desolder the pins. Just didn't want to do that if there is an easier solution as I haven't soldered on PCB since 2001 and that was just a component or 2 in school.

    Any advice on soldering kit I should buy? Is a 60 watt 110v ebay kit for $22 sufficient? Or should I be spending more?
     
  8. Martaine2005

    Martaine2005

    2,911
    796
    May 12, 2015
    A 60W iron for this is way too much and with very little experience, you’ll likely damage the component or pcb pad.
    A smaller wattage iron like 18W - 25w with solder sucker would be much more suitable.
    But try the allen key first.


    Martin
     
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