randy,
it is also possible that the regulator is not working and CAUSING the scr to
trip.
can you measure output voltage? or is zero indicating a shorted output line
is the 20 amp fuse popped? It should be if the scr has fired. If not, then we
need to look a bit deeper into the schematic.
getting to the zener diode and the scr is a bit tricky.
You'll need to remove some of the wires, mark where they go, take a few digital
photos if need be, but you can gently remove the entire pcb and the heatsink
from the chassis.
Mike, wb8vge
On Feb 4, 2013, at 11:21 PM, Randy Fulco wrote:
> The full wave bridge from the transformer is labelled VARO207T. Does anyone
> know what that would sub to? Yes, know many might work, but anyone had
> experience here? The output is shorted, upon turn on- the lamp flashes, goes
> to overload, meter show it drawing 5A, and pass transistors start heating up
> and they would self destruct if left on. Suspect the crow bar zener bad,
> 1N966. Pass transistor both ohm out ok, and both heat up the same. Any
> thoughts?
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