Rainbow 100 PSU capacitor list

Tony Duell ard.p850ug1 at gmail.com
Tue Mar 5 23:06:29 CST 2019


On Wed, Mar 6, 2019 at 12:16 AM Alan Perry via cctech
<cctech at classiccmp.org> wrote:
>
> For a little background, I had run the system for about 15 minutes, then
> it sat for a couple months while I removed the PVA from the display,
> then, when I tried to run the system again, the system started to boot
> and then the circuit breaker popped.

This is a switch mode power supply with all the failure modes that that
implies :-)

I'd start by checking the mains bridge rectifier (actually used as a pair
of diodes in a voltage doubler circuit on 110V mains), the mains
smoothing capacitors (820uF?) and the BUV47 chopper transistor. If
the last is short-circut then it's very possible it was damaged by a
fault elsewhere in the PSU.

-tony


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