Spectrum +3 Power supply

For experts to discuss very technical stuff and newbies to ask why the Spectrum they bought off ebay doesn't work.
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Oggyuk
Drutt
Posts: 3
Joined: Tue Jun 18, 2019 10:27 pm

Spectrum +3 Power supply

Post by Oggyuk »

Well power supply went down on my +3, spare one still works and +3 ok.
I have checked the 2 fuses inside, they are ok, what should I be looking at next?
Thanks
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1024MAK
Bugaboo
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Joined: Wed Nov 15, 2017 2:52 pm
Location: Sunny Somerset in the U.K. in Europe

Re: Spectrum +3 Power supply

Post by 1024MAK »

The two transistors.

If the +5V output is shorted, or overloaded, it typically kills one of the transistors and the fuses don’t blow.

Mark
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Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb :dance
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