Astec LPT42 PS schematic

[Bob Urz]

I am trying to find a schematic on a Astec LPT42 3 output switch
mode open frame power supply. It seems Astec does not supply
schematics. The -12 volt regulator (IC3), blew apart, filter
caps domed, and it seems the 1/2 wave rectifier diode is shorted
(D15). I am assuming IC3 is a 7912 or such, but would like a know
for sure before trying it. There is also one resistor (R16) that
is dark and i would like to ID. Any help appreciated.

And a note to Sam Goldwasser:
(sam FAQ quoted)
"If you live in East Armpit, Nebraska, you probably won't be able to
find the components you need, so give up now."

All of Nebraska Aint the backwoods Sam.........

Bob

 

[Johannes Frank]

[Astec LPT42]

I am assuming IC3 is a 7912 or such, but would like a know
for sure before trying it.

Your assumption is correct.

There is also one resistor (R16) that
is dark and i would like to ID.

27 Ohm, 5%

HTH


JF

 

[Bob Urz]

[Astec LPT42]

I am assuming IC3 is a 7912 or such, but would like a know
for sure before trying it.

Your assumption is correct.

There is also one resistor (R16) that
is dark and i would like to ID.

27 Ohm, 5%

HTH


JF

Thanks for the info.

Bob