Old DEC Power Control 861C
ard at p850ug1.demon.co.uk
Sun Dec 20 12:50:11 CST 2009
> Tony Duell wrote:
> > The DEC power cotnrollers are _very_ simple inside, and you don't really
> > need tjhe printsets to repair them.
> You need the print set of a DEC power control if you're trying to figure
> out why the power control in a Type 30 point-plot display attached to a
> PDP-1 keeps tripping its circuit breaker as soon as mains voltage is
> applied to its input. Once you have the print set, it becomes apparent
Well, OK, if the Phantom (as the Radiophile magazine calls him) or that
well-know UK radio amateur M0RON has been in there before you then all
bets are off.
> that someone seriously miswired the innards of the power control,
> possibly in a previous misguided repair attempt. Upon rewiring it to
> factory spec, and replacing a switch on the front of the power control
> that turned into a dead short when it was miswired, it will then work
However, I suspect in this case I could have got it doing the right
things without a printset. Not necessarily the original DEC circuit, but
at least not shorting out the mains.
More information about the cctech