A few weeks ago I was going to use my power feed on the mill to get a uniform travel speed for a MIG weld . Don't know if it was having the welder ground on the mill or just chance , but when I turned on the PF it popped the breaker built into the PF. So I pushed the reset , and that's when the magic smoke was released ... I've replaced it already but got curious . So today I pulled it apart and discovered a trace on the circuit board is fried . This trace goes to the neon power light from the 110v supply input plug on the board . Other side of the neon bulb goes to a small resistor , then somewhere else . Something else I found is that a pair of 1N5404 diodes - each connects to one side of the 110v input plug on one end and both are connected to the same trace on the other end - both show 0 resistance both directions . No other discrete component on the board shows any sign of damage . I can get a replacement board for 65 bucks +s/h/t but I only paid 50 bucks for this thing originally so ... anybody familiar with these circuit boards ? All my electronic training was a long time ago and while I can trace circuits on a board it doesn't mean anything without a schematic . But I do think the blown diodes may be the problem ... OR they could be result of the real problem ... or ... I can get those diodes for .55 each , cheap enough I think I'll order some . Hey , they're bad and will need to be replaced anyway if this thing's gonna ever work again . If I can get it working , it'll be the basis for a variable speed rotater for welding - with the work suitably insulated from the unit !
- posted
2 years ago