512k started smoking when I plugged it in, power switch was off

[leothecomputerguy]

Hi All,

I recently bought a 512k and It worked when powered on once after it was delivered. I unplugged it & spent a few weeks learning about the system & preparing to refurbish it. I plugged it in yesterday and there was a pfft and it started smoking. I unplugged it so no other harm was done. I've tried to look for description of a similar occurrence online, no luck. I've consulted the Dead Mac Scrolls & Macintosh Repair & Upgrade Secrets.

Anyone have any ideas?

Thanks

 

[Unknown_K]

Did you look inside? Probably a filter cap smoked.

 

[bibilit]

Yes, filters caps, usual... no big deal.

 

[leothecomputerguy]

Thanks that's reassuring.

 

[techknight]

It was probably the line safety capacitors. Either the X1/X2 or Y1/Y2 capacitors.