On Wed, 2 Jun 2021 at 15:13, Chris Zach via cctalk
wrote:
>
> Really? There is a 10a fuse in a round holder on the back of the rack,
> right by the plug input. Swapping the H786 power supply with another one
> results in a working unit for me, so I don't think the problem is in the
> power switch
Really? There is a 10a fuse in a round holder on the back of the rack,
right by the plug input. Swapping the H786 power supply with another one
results in a working unit for me, so I don't think the problem is in the
power switch box.
Maybe you have a BA11-M? Is it a 4 slot chassis or 9?
C
> On Jun 2, 2021, at 6:34 AM, Steve Maddison via cctalk
> wrote:
>
> On Tue, 1 Jun 2021 at 22:38, Paul Koning wrote:
>>
>> I'm not sure if you're talking about the same sort of device I had trouble
>> with, so FYI: the Pro power supply is a box the size of an old-fashioned
>> Bible, with
Those filter caps also cause other problems. I had now two cases in
succession where an old computer tripped the Residual Current Device (RCD)
in my switchboard. Both used Sprague 0.1 uF filter caps in "bathtub"
configuration in a metal can. Each cap is connected on one side to ground
and the other
On Tue, 1 Jun 2021 at 23:39, Chris Zach via cctalk
wrote:
>
> Interesting: I just tried firing up a pair of BA11-N's to see if they
> work. One blew the fuse in that block in the back and I thought it was a
> shorted PS but the PS input caps are not shorted. I'll check to see if
> the filter capac
On Tue, 1 Jun 2021 at 22:38, Paul Koning wrote:
>
> I'm not sure if you're talking about the same sort of device I had trouble
> with, so FYI: the Pro power supply is a box the size of an old-fashioned
> Bible, with a CEE power inlet at one end. That inlet is actually part of a
> sealed metal
Interesting: I just tried firing up a pair of BA11-N's to see if they
work. One blew the fuse in that block in the back and I thought it was a
shorted PS but the PS input caps are not shorted. I'll check to see if
the filter capacitor in that spot is shot.
On 6/1/2021 4:16 PM, Steve Maddison
> On Jun 1, 2021, at 4:16 PM, Steve Maddison via cctalk
> wrote:
>
> After a few years in storage I'm finally getting to play with my PDP-11
> stuff again. Figured I'd start small so rolled out the 11/23. PSU looks
> fine, pulled all the cards and checked voltages, no problem. Shortly after
>
After a few years in storage I'm finally getting to play with my PDP-11
stuff again. Figured I'd start small so rolled out the 11/23. PSU looks
fine, pulled all the cards and checked voltages, no problem. Shortly after
however, some magic smoke was released from the block in the back where AC
comes
