Author Topic: ESAB CaddyTig HF TIG inverter welder repair.  (Read 1866 times)

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Offline pappkopp

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ESAB CaddyTig HF TIG inverter welder repair.
« on: December 28, 2017, 12:34:26 am »
Hello, this wont be your normal test instrument repair but i hope it will be interesting
I’m trying to repair a inverter TIG welder i just bought, but i cant seem to understand it completely, the problem is that it wont power up, the main rectifiers are working, but there is no power to the logic section. I have have had a look at the service manual, and measured the points that are mentioned, i tried to replace a swiching mosfet. The D²Pak in the right corner (for the logic part i belive, internal diodes showed up as open circuit)

Please see the attatched service manal, as you can se on the Picture, there are two screw terminals, here is a +325VDC voltage measured and correct, and i belive it is somehow switched with the mosfet into the red/orange transfomer marked «UTK»
Could someone please help me troubleshoot this? There is no voltage at the output of the transformer, or the linear voltage regulators.

Kind regards :) And thanks in advance  :)
Service manual:
https://www.manualslib.com/manual/989932/Esab-Caddytig-Hf.html




 

Offline ivi_yak

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Re: ESAB CaddyTig HF TIG inverter welder repair.
« Reply #1 on: December 28, 2017, 04:52:37 pm »
hi, could you check in out voltage on linear reg?
eevblog
 

Offline pappkopp

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Re: ESAB CaddyTig HF TIG inverter welder repair.
« Reply #2 on: December 28, 2017, 08:39:00 pm »
There is no voltage on the regulators.
 

Offline oldway

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Re: ESAB CaddyTig HF TIG inverter welder repair.
« Reply #3 on: December 28, 2017, 09:13:18 pm »
The service manual does not contain the detailed diagrams nor the drawings of the PCB tracks as it is based on the modern principle of exchanging defective electronic cards with new cards.
It is not planned to repair the cards yourself.

So, it is necessary either to inquire with the ESAB representative on the possibility and the cost to exchange the card,or to do reverse engineering ....

If you do not help, without the diagrams, we also can not help you ....

Follow the tracks of the printed circuit and look for where the 5V power supply for logic circuits is coming from and why there is no voltage .... It seems to me that the 5V is produced from 19V or 24V ... .

Avoid changing components if you are not 100% sure that the part is defective.

Be very careful, in this device, there are high voltages that are not isolated from the network, it is very dangerous.
 


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