H786 power supply help wanted

Jon Elson elson at pico-systems.com
Sat Mar 30 22:47:28 CDT 2019


On 03/30/2019 07:50 PM, Charles via cctalk wrote:
> Update: I removed the H786 from the chassis, and set it up on the workbench with loads on the +5 and +12.
> No output. 320V across the half-bridge, but no +12 Startup. Found I had forgotten to put a cliplead to the primary of the startup transformer.
> Turned it on and it works... 5 and 12 volts into 1 ohm and 4.7 ohm respectively. WTF.
>
> So I disconnected the PC supply, put the H786 back in, and it fired right up (including the real-time clock) and I ran it for half an hour.
> Go figure. Ain’t classic computers fun sometimes...
>
>
>
Connectors, always flaky connectors!

Jon


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