I've got a Campbell Hausfield hobby type compressor I won in a contest back a
bit. Anyway been working fine, shut it off for a few months and when I went to
use it again, no joy. (Fortunately I have a backup).
Fuse was blown so I put in another one. Bzzt! Hmm, let's try that again. BZZT!
OK, there's a dead short somewhere. Got thing completely disassembled. There
is no obvious fry or melt anywhere. The motor brushes, etc look fine no
visible shorts, not even sure you could have one.
The only electrical components are the power switch, the pressure switch and
on the PCB itself are a Metalized Polyester Film Cap 104K/630V and a KBPC1-10
Bridge rectifier. Oh and the fan leads, a standard 120V type cooling fan.
Now I am definitely not a real electronic gearhead. I can solder/desolder, use
a meter and I sort of know what the components are for. So my question is
could a rectifier fail sufficiently to cause a dead short without any external
evidence. I'm pretty sure it isn't the cap since it's just in and out 2 leads,
but the rectifier has 4 legs and from the data sheet I looked at I could
definitely see where an internal short could develop.
And no I haven't metered anything yet, I just got it disassembled for the
preliminary exam and wanted to ask this.
- posted 12 years ago