Re: CBM 710: Replacing Power Supply - Help Needed

Den Fri, 13 Apr 2018 21:45:52 +0200 skrev Michał Pleban
<lists@michau.name>:
> Hello!
> 
> The power supply in my 710 died yesterday so I am going to do
> something similar. My initial idea is to order something like this to
> get the 50 Hz signal:
> 
> https://www.aliexpress.com/item/TP354-NE555-Module-Square-Wave-Output-Oscillator-Adjustable-Frequency-Pulse-Generator-Signal-Source/32826207160.html
> 
> Everything else should be provided by the RT-125B.

As your dead PSU already has the correct voltage, you could use that to
generate the 50Hz signal. Just disconnect the main rectifier bridge and
feed +5V via another wire to the 50Hz pulse generating circuit.

Or you could repair the broken PSU. Unless a TDA1060 / NE 5560 or some
replacement for the BUV48A/BUV47A power transistor is hard to get,
there aren't any parts that's likely to be break and hard to get a hold
of.

I'd start with checking the electrolytic capacitors for short circuits.

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