For those of you starting out in retro repairs, there are some good channels out there on YouTube.
Personal favourites of mine are Adrians Digital Basement, and Noels Retro Lab.
I thought this video was particularly good for its basic troubleshooting process: https://www.youtube.com/watch?v=wr22g56qslE
Take a look at what Noel does, starting with voltage checking at the beginning, and how he refers to schematics and looks at the circuits and tests them.
If you don't have a clue, it's a nice little video to start with.
A good video on basic troubleshooting
- rubber_jonnie
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A good video on basic troubleshooting
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...