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Thread: Lincoln Idealarc Tig 300/300 - No Joy

  1. #76
    Join Date
    Jul 2019
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    Re: Lincoln Idealarc Tig 300/300 - Parts

    Quote Originally Posted by burnt_fingers View Post
    Here's a list with links below to get you started rebuilding L5269 pc board & M12654 SCR Diode stack.
    the manual, troubleshooting & schematics are here: http://1drv.ms/1kPG2BY

    resistors & caps - mouser.com, the quantities listed are more than you'll need, I wanted to have a few spares of each.
    http://www.mouser.com/ProjectManager...sID=6d3d1ed848

    you need 2 - 27 ohm 1/2w resistors for the diode/scr board i grabbed them here because I forgot to get them at mouser
    http://www.ebay.com/itm/400326248247

    300amp clamp meter so you can follow the procedure to adjust the trimmers.
    http://www.ebay.com/itm/221383498866

    10K pot- front panel curent control rheostat
    http://www.ebay.com/itm/141174245766

    NTE5994 diodes for the diode/scr board
    http://www.ebay.com/itm/201042036856

    NTE5545 SCR for the diode/scr board
    http://www.ebay.com/itm/191002375053

    2n525 transistor
    http://www.ebay.com/itm/370525660454

    2N4062 transistor
    http://www.ebay.com/itm/221358189793

    2n2646 transistor
    http://www.ebay.com/itm/171232577633

    2N3390 transistor
    http://www.ebay.com/itm/370632437486

    MCR107 scr

    http://www.ebay.com/itm/370933275904

    Kemet Axial Tantalum Capacitor 1uF 35V T310
    http://www.ebay.com/itm/110831674812
    for some reason I cant see the parts list you put together would it be possible to get it from you? never mind i got it sorted out ty for this my friend.
    Last edited by Glitch; 10-08-2019 at 10:27 PM.

  2. #77
    Join Date
    Jan 2014
    Location
    On the beach in S.C.
    Posts
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    Re: Lincoln Idealarc Tig 300/300 - No Joy

    I have the trouble shooting guides if needed.

  3. #78
    Join Date
    Jul 2020
    Location
    France
    Posts
    1
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    Re: Lincoln Idealarc Tig 300/300 - No Joy

    Hello. I have no welding power amperage and 30 V at the welding terminal of my Lincoln Idealarc Tig 300. I changed all the diodes of the SCR board put it back same thing with bad diodes again. I am sending my PC board to be checked. If anyone had this issue I would be glad to hear from you. I have a L 5271 board. This problem is the same AC or DC with the remote or panel switch position.
    Thank you for your time and consideration.
    Redarc

  4. #79
    Join Date
    Sep 2020
    Location
    Haleiwa, HI
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    Re: Lincoln Idealarc Tig 300/300 - No Joy

    Quote Originally Posted by AWPMAN View Post
    I have the trouble shooting guides if needed.

    Hello AWPMAN,

    I'm new the forum and this is my first communication. I have a very dear-to-me Idealarc 300/300 code 7288 that I'm bringing out of storage and would be FOREVER grateful if you would be so kind as to share the troubleshooting guides since the links above do not work anymore. I acquired my welder in trade for some work on a car in the mid-80s when I had a one model/one marque auto shop. I used it quite often, then I moved to Hawaii and used it quite a bit in the 90s. Stored it for 20 years in my dining room, living room, and then my shop as I was building my house and shop. It worked fine when I used it last but now it doesn't (no surprise there). I spent a fair amount of time revamping the cooling system and it's dolly...thinking the whole time that the more work I put into it without testing it, the more likely it will need repair. I blew the fan's run cap within 5 minutes while going over components with an IR temp probe, but after it passed the initial smoke-check, I tried TIG on some aluminum and it didn't want to spark. I've done some initial checks but can't say a whole lot yet other than I believe the transformer is good (.2 ohms on AC) and I'd like to collect as much info as I can before the data becomes unavailable and I jump in with both feet. The troubleshooting guides you have (I assume the same ones from Burnt Fingers) are very likely gold for those of us that have the vintage machinery disease.

    I hope this query finds you and your family well. Best Regards, tfom

  5. #80
    Join Date
    Mar 2010
    Location
    Ceres, California
    Posts
    3,618
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    Re: Lincoln Idealarc Tig 300/300 - No Joy

    send me you email by private message. I have a file that will help you.
    It is two large to post here. about 5 meg.

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