[TenTec] Help wi TT 280ps

[Mike Bryce]

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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