Bobcat 225 NT died and will not do anything

[cruizer]

Well I pulled the top off this evening and the F1 Fuse is blown, duaneb55 what is the best way to check the D4 and the SR2? I know that I need to check resistance with a ohm meter but not sure how I need to do. Also it takes a while to get parts around here, does anyone know if I can get a aftermarket fuse and also the best place to order parts online?

Well, just stick a simple glass fuse in it, a Electronics store will have the ceramic version, a gas station will have the fuse. Don't worry bout the voltage on the fuse, an amp is still an amp. It'll blow all the same.

[bros1964]

Thanks Cruizer, I tried a regular glass fuse, still have weak weld output. The machine speeds up when arc is struck but not enough output to keep arc. Does anyone have any advice on what to check next? I realy need to get this machine running. Thanks for the help.

[duaneb55]

Sounds like bridge rectifier SR2 is bad and you're only getting battery voltage (initial exciter current) at the brushes. If you're unsure on how to test SR2 with a VOM (diode setting) - google is your freind.

You'll also need to check D4 the same basic way and I wouldn't doubt it's shorted which would explain the blown F6.

[bros1964]

Thank you sir, I will try testing the rectifier and the diode board this evening. I will let you know what I come up with.

[bros1964]

Checked the SR2 and D4, the SR2 checked out ok the D4 was bad. Waiting on parts. I will let you know when I get parts how it turns out.

[bros1964]

Replaced the D-4 Diode Board and the welder is working fine. Thanks for all your help.

[duaneb55]

Fantastic. Thanks for the follow up.