Trailblazer 350-D with 700 hours "Broke"???

[ichudov]

I bought, today, at an appropriate price, a Trailblazer 350-D diesel welder. It has a tag on it that said "broke".

It looks good in all respects and I am wondering, what are the most typical issues "to go wrong" with this welder.

Any clues and real life experiences will be much appreciated.

I do have some certain amount of troubleshooting skills. The "high voltage, do not open" label never impressed me.

Thanks

i

[Sberry]

We can assume the engine runs?

[ichudov]

Sberry, to be honest, I have not yet tried, I wanted to gather some information first, to be more careful approaching it. The battery is dead, which is, obviously, not that big of a deal.

This one has a Kubota engine and lift arc TIG.

i

[atc250r]

I'd suggest trying to get it to run first, then try welding with it. Not much we can help you with till then.

[ichudov]

Yep, will do the first thing tomorrow,. Will report my findings.

[ichudov]

OK, I did run it.

The diesel engine starts and runs strong.

There is, however, no output on the AC generator end or on the DC welding output. Nada.


Any ideas?

Thanks


i

[cruizer]

Remove the top cover, on top of everything is your power board, check the fuse. If thats ok, the power board is likely toast.

[ichudov]

Thanks. As I said, there is no output, neither welding, nor AC.

i did the following.

1) Removed and visually checked the brushes and looked at slip rings. The brushes look great, with plenty of life left in them. Slip rings also look OK.

2) On both boards (big and small) the fuses F1 do conduct correctly.

3) When I turn on the ignition key, the LED lights on the larger board do NOT light up.

4) When referenced to ground, there is no voltage on ANY of the pins of connector RC15.

Any ideas? It does seem to point to a problem with the larger board.

Thanks, guys!

[cruizer]

Without a power board nothing much is going to light up.

[ichudov]

Without a power board FXXXK ALL is going to light up.

I am sorry, I did not understand...

[JSFAB]

Generally, when you see multiple "x"'s printed in a row, on a family-friendly website such as this, means something unprintable. Of course, the kids who might be reading, have no idea what "xxxx" means.

Back to the original question,,,,, I'd also suspect a board. Over many years,,, I have discovered it's never the ten-cent fuse that blows first, it's the $500 board that takes out the ten-cent fuse.

[cruizer]

Sorry bout that been in a funk all day, Started with a customer comming in and telling me that his new Ranger 305 didn't work and yelling up a storm. I'm tired so I gave him back my explanative verbal version , and turned his remote contactor switch on. He thought it was for the remote cable.

Then another guy showed up with his thermaldyne plasma. I told him ( on the phone yesterday to replace his stuck start cartidge. Oh no that couldn't be the problem, had to be a circuit board. So the guy brings it in. Before he even got it off his truck, I remove the nozzle and sure enough, a stuck start cartidge. Idiots....

Now getting back to the original problem, I'm looking at a technical diagram for the machine, so when I suggest something, its not really nessessary to think the probem is somewhere else, yes it could very well be a damaged stator or rotor, but at 700 hrs, that would be quite unusual.

[ichudov]

Cruzer, thanks.

So, to be sure, you think that I need to replace the bigger board, right?

Also, is there some way to find that technical diagram and troubleshooting procedures?

Thanks

[cruizer]

Your after PC7, which is the top board.even if F1 checks ok, I'd first be pulling the fuse and cleaning its mount. Often there is corrosion as they tend to be aluminum mounts.

[ichudov]

All signs point to the bad big board, I ordered a replacement.,