Looking for schematic, wiring or block diagram for TD Pak Master 50 logic board
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  1. #1
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    Looking for schematic, wiring or block diagram for TD Pak Master 50 logic board

    I have a Thermal Dynamics Pak Master 50 (not an xl) that after diagnosing using the service manual, appears to have a bad logic board. Since the unit and all it's internal parts are obsolete and no longer sold, I'd like to try to repair the board. I've contacted Thermal Dynamics and have requested the LLD (logic) board schematic or even a block diagram, but it has to be submitted to see if they will release it to me. So I thought I would ask my fellow Welding Web'ers to see if anyone out there has one they would share. Any help would be appreciated.

  2. #2
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    Re: Looking for schematic, wiring or block diagram for TD Pak Master 50 logic board

    So it looks like nobody here has a schematic for the board and TD still hasn't got back to me. Here is the problem this cutter is having. When turned on, the fan comes on, the AC light is on, the temp light is green, the PIP light is on, and the gas light is on and gas flows for 20 seconds. When the trigger is pulled, the gas flows and the spark gap assembly and the torch have a quick small arc and then there is nothing. According to the service manual and based on the tests they have, the LDD board is faulty. Has anyone else had this problem and were able to fix it? Usually if I have the schematic, I can fix pretty much anything. Anyone with any ideas or if you have a working LDD board you would sell, I would appreciate your help. Thanks

  3. #3
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    Re: Looking for schematic, wiring or block diagram for TD Pak Master 50 logic board

    Wish I could help Steve. Sorry.
    MM200 w/Spoolmatic 1
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    Bobcat 225G Plus - LP/NG
    MUTT Suitcase Wirefeeder
    WC-1S/Spoolmatic 1
    HF-251D-1
    PakMaster 100XL
    '68 Red Face Code #6633 project
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  4. #4
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    Re: Looking for schematic, wiring or block diagram for TD Pak Master 50 logic board

    Do you have 120VAC between J18-1 and J18-3 when the torch is activated during and after the brief blip of an arc at the spark gap assembly and torch?
    MM200 w/Spoolmatic 1
    Syncrowave 180SD
    Bobcat 225G Plus - LP/NG
    MUTT Suitcase Wirefeeder
    WC-1S/Spoolmatic 1
    HF-251D-1
    PakMaster 100XL
    '68 Red Face Code #6633 project
    Star Jet 21-110

    Save Second Base!

  5. #5
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    Re: Looking for schematic, wiring or block diagram for TD Pak Master 50 logic board

    Backing up half a step, does the DC indicator come on within2 seconds of activating the torch?
    MM200 w/Spoolmatic 1
    Syncrowave 180SD
    Bobcat 225G Plus - LP/NG
    MUTT Suitcase Wirefeeder
    WC-1S/Spoolmatic 1
    HF-251D-1
    PakMaster 100XL
    '68 Red Face Code #6633 project
    Star Jet 21-110

    Save Second Base!

  6. #6
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    Re: Looking for schematic, wiring or block diagram for TD Pak Master 50 logic board

    Quote Originally Posted by duaneb55 View Post
    Do you have 120VAC between J18-1 and J18-3 when the torch is activated during and after the brief blip of an arc at the spark gap assembly and torch?
    Hey Duane
    I haven't checked that. The DC and pilot lights never come on, so I didn't do that test. I can check that today. Also d51 is lit as soon as power is turned on. Checked the 6k power resistors and both checked out as good. I have checked connectors for bad connections, but have found none. I have not been able to check the cap board for 300v dc yet due to my volt meter probes are a bit too short to do it safely. I was planning on rigging up some type of extensions on the probes, but haven't had time to get back to it. I'll try to get that done this afternoon.

  7. #7
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    Re: Looking for schematic, wiring or block diagram for TD Pak Master 50 logic board

    Did you check for 15-18VAC between LDD board J1-9 to J1-7 and from J1-9 to J1-6?

    Apparently, voltage in this range at these locations indicate a faulty LDD board.
    MM200 w/Spoolmatic 1
    Syncrowave 180SD
    Bobcat 225G Plus - LP/NG
    MUTT Suitcase Wirefeeder
    WC-1S/Spoolmatic 1
    HF-251D-1
    PakMaster 100XL
    '68 Red Face Code #6633 project
    Star Jet 21-110

    Save Second Base!

  8. #8
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    Re: Looking for schematic, wiring or block diagram for TD Pak Master 50 logic board

    What's your air pressure set at?
    MM200 w/Spoolmatic 1
    Syncrowave 180SD
    Bobcat 225G Plus - LP/NG
    MUTT Suitcase Wirefeeder
    WC-1S/Spoolmatic 1
    HF-251D-1
    PakMaster 100XL
    '68 Red Face Code #6633 project
    Star Jet 21-110

    Save Second Base!

  9. #9
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    Re: Looking for schematic, wiring or block diagram for TD Pak Master 50 logic board

    Quote Originally Posted by duaneb55 View Post
    Did you check for 15-18VAC between LDD board J1-9 to J1-7 and from J1-9 to J1-6?

    Apparently, voltage in this range at these locations indicate a faulty LDD board.
    Yes. there was 18V between both. Another reason to suspect the LDD board.

  10. #10
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    Re: Looking for schematic, wiring or block diagram for TD Pak Master 50 logic board

    Quote Originally Posted by duaneb55 View Post
    What's your air pressure set at?
    70psi. I tried changing up or down in case the on board gauge was wrong. so far everything points to the LDD board. It has a bank of relays on the board and I question whether 1 or more have failed. I find a lot of faulty relays on welder circuit boards.

  11. #11
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    Re: Looking for schematic, wiring or block diagram for TD Pak Master 50 logic board

    Also thought I'd mention that if I bypass the logic by jumping TP21 to TP3, I get DC voltage and a continuous arc at the the spark gap assembly.

  12. #12
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    Re: Looking for schematic, wiring or block diagram for TD Pak Master 50 logic board

    I'm actually not familiar with the machine and I was just going down the troubleshooting list throwing things out in case you missed something.

    Are you using service manual 0-2444?
    MM200 w/Spoolmatic 1
    Syncrowave 180SD
    Bobcat 225G Plus - LP/NG
    MUTT Suitcase Wirefeeder
    WC-1S/Spoolmatic 1
    HF-251D-1
    PakMaster 100XL
    '68 Red Face Code #6633 project
    Star Jet 21-110

    Save Second Base!

  13. #13
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    Re: Looking for schematic, wiring or block diagram for TD Pak Master 50 logic board

    Quote Originally Posted by duaneb55 View Post
    I'm actually not familiar with the machine and I was just going down the troubleshooting list throwing things out in case you missed something.

    Are you using service manual 0-2444?
    Yes, that was the only one I could find online.

  14. #14
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    Re: Looking for schematic, wiring or block diagram for TD Pak Master 50 logic board

    Update: Thermal Dynamics sent me the schematic for the logic board. I've got to say the customer service tech that I was communicating with, was awesome. He gave me several things to check while we were waiting for the schematic from their outside server. Ended up finding a bad resistor which led to a bad optocoupler. Just waiting for parts from Mouser. We'll see if it fixes it or if there is a continuing line of failed parts. Keeping my fingers crossed. If anyone needs a copy of the LDD board schematic, message me. Thanks Duane55 for your ideas. I appreciate your help.

  15. #15

    Re: Looking for schematic, wiring or block diagram for TD Pak Master 50 logic board

    Steve B.

    Were you able to get your LDD board working? Could you send me a copy of the LDD board schematic? My PakMaster 50 has the exact same symptoms as yours. Thanks

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