ZX Spectrum 48k Capacitor Replacement

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Replacing the old electrolytic capacitors on an issue 4A Sinclair ZX Spectrum I recently got for very cheap. It's also worth noting that it's one of the rare yellow PCBs.
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Опубликовано:

12 сен 2024

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Комментарии : 49

@TheDefpom 7 лет назад

The spectrum is a favorite of mine, I leant to code on that and a zx81 when I was a kid, nice to see someone taking the time to restore one.

@JanBeta 7 лет назад

TheDefpom Thanks. :) I never had one. They're quite rare in Germany. I instantly fell in love with it the moment I first used it. Such an imperfect but strangely great machine.

@redhawk668 6 лет назад

Great job on the recapping, enjoyed this video. I also have done some Spectrum refurbishing myself. I’ve now done two of them. I used Vishay axial caps on both Spectrums, they fit perfectly and they look like the old ones. I also done some other modifications to prolong the life of the Spectrums, I replaced the ageing 7805 voltage regulator for a Traco TSR-1-2450 modern switching voltage regulator, less heat and no heatsink required anymore. I do heatsink the ULA chip, because they are prone to fail, because of heat. Especially the 6C001E-6. In case of a rubber key case, I desolder the socket and solder the chip straight to the PCB, so it all fits in the case. For a Plus case no desoldering or soldering required. Of course I also did a composite mod with a 100 uF capacitor.

@JanBeta 6 лет назад

Thanks! Funny that you mention the Vishay caps. I just ordered a whole bunch for future ZX Spectrum work after finding out a German electronics supply sold them. I had been looking for decent axial caps for a while now. I also have some switching converters I want to try in the Speccy and I need to heatsink the ULA, too. Didn't have much time for the Speccy but I'll make more videos about it soon for sure. :)

@redhawk668 6 лет назад

Jan Beta I got the Vishay's and the voltage regulator from Conrad. What I see, is that the delivered current in combination with a modern switchmode PSU is a lot cleaner. You can actually see that in the video signal. Less dot crawl.

@JanBeta 6 лет назад

+Robert de Boer I ordered from Conrad, too. Interesting that the current is cleaner with the modern regulator. Maybe I’ll make a video and compare the output with the scope some time. Might be interesting. :)

@SimonHarris75 28 дней назад

I prefer to bend the negative lead over and run the positive lead across the top. There's no need for messy heatshrink and it fits closer to the PCB. It looks much neater doing it this way.

@TheDefpom 7 лет назад

I've done the same trick with the caps, only I run the lead along the side to keep it away from the pcb, I think I show it in my tektronix repair video.

@JanBeta 7 лет назад

TheDefpom Oh, I think I even watched that video but couldn't remember. I initially planned to use all axial caps but it's getting more and more difficult to get good ones lately, it seems.

@RogerBarraud 5 лет назад

The heatshrink is definitely a good idea - thanks Jan and JPC :-)

@GadgetUK164 7 лет назад

Great job as usual =D

@JanBeta 7 лет назад

Thanks again. :)

@MindFlareRetro 7 лет назад

GadgetUK, do you happen to know what the mod is for near the speaker?

@JanBeta 7 лет назад

***** Ah, that would explain it. Thanks for pointing it out. :)

@TheHighlander71 7 лет назад

Some people think there should be a decoupling capacitor on the rgb signal out line. I love JoulesPerCoulomb. He was my inspiration for recapping my Spectrum.

@JanBeta 7 лет назад

+The Highlander I may add a cap later. The picture is quite good without it already (especially compared to the crap RF signal). I first got to JoulesperCoulomb's channel because he repaired the same Philips scope and then later found out he's also a Speccy wizard. :)

@TheHighlander71 7 лет назад

I never bothered with the decoupling cap. I read somewhere that it wasn't really necessary anyway. I wouldn't know what it's meant to do either.

@JanBeta 7 лет назад

i don't think it's necessary, could make the signal a bit clearer, though. Decoupling caps are usually used to filter out noise. Maybe worth experimenting.

@MindFlareRetro 7 лет назад

Great work, yet again. Interesting trick with the radial caps -- so, you didn't actually have to shrink the heat shrink tubing? Did you ever figure out what that mod does?

@JanBeta 7 лет назад

I could have shrunk the tubing but its only purpose is to isolate the capacitor lead from the unisolated traces on the board so there's no need as long as it's kept in place by the bend leads. The strange mod looks similar to a mod that was (it seems) widely done on older PCB versions to fix some issues with certain power supplies. Not sure yet as I didn't find much online and didn't have the time to "reverse-engineer" the circuit.

@MindFlareRetro 7 лет назад

Yes, I see what you mean about the "shrinking" not being required. A nice recap job, and another retro computer ready for another 30+ years!

@JanBeta 7 лет назад

Hopefully. I heard some of the transistors tend to break, too. ;)

@GadgetUK164 7 лет назад

Isn't it the standard clock mod you see sometimes on these boards? Comprising of a resistor and diode?

@JanBeta 7 лет назад

It's two diodes and a capacitor. Looks more like some kind of rectification/smoothing circuit. I'll look into it if I find the time. The Speccy seems to work perfectly fine, so probably nothing to worry about too much. ;)

@104d_3rr0r_vince 7 лет назад

For the composite mod, you can add a 100μf capacitor.

@JanBeta 7 лет назад

I wanted to do it the "quick and dirty" way first. Maybe I'll add a capacitor and a transistor next. Works quite well without it already. :)

@104d_3rr0r_vince 7 лет назад

And you did well. I was referring to your future plans as you said near the end of the video.

@JanBeta 7 лет назад

+Vincent GR Thanks. :) Definitely going to composite mod this in another video.

@SparksNZeros 6 лет назад

i find just sticking a bit of flux on the solder wick helps too in getting the solder to creep up the wick

@JanBeta 6 лет назад

Yes, you can never use too much flux. :) The solder wick I used already has a decent amount of flux in it so it works well most of the time though.

@TheDefpom 7 лет назад

You should get your self a cheap desoldering gun, like the one I use in my videos, from aliexpress, well worth the money.

@JanBeta 7 лет назад

TheDefpom I actually have one of the cheap desoldering stations that I would have used normally. Unfortunately, some solder was stuck in there pretty badly just before I shot this video so I went for the old school method. ;)

@calbarnes7951 7 лет назад

Great video! I've never seen a real Speccy, we never got them in Australia but I grew up on Commodore 64! Edit: I can't say we never got them here, I just never saw one and none of my friends had one but they probably were sold here...

@MindFlareRetro 7 лет назад

Similar case here in Canada (and the US). Sinclair partnered with Timex back in 1982 and the computers were sold in North America under the Timex Sinclair brand (goo.gl/Jy3lu), but they were still grossly overshadowed by Commodore and Atari.

@JanBeta 7 лет назад

It's actually the first one I ever used, too. They were not as popular here in Germany as they were in Great Britain. I also had a C64 when I was a kid but I already fell in love with the Speccy, too. ;)

@MiniWarzone 6 лет назад

Brilliant video sir.

@JanBeta 6 лет назад

Thank you! :)

@RogerBarraud 5 лет назад

My guess re that mess by the speaker is it's a mod for using an AC power pack instead of DC.

@RogerBarraud 5 лет назад

I'd retain the axial capacitors if I were doing it. Mainly to preserve the aesthetics. Preferably blue bodied ones too.

@jaycee1980 3 года назад

You can get those, but only Vishay make them and they are quite expensive compared to normal radial capacitors

@MrPcatt 6 лет назад

what I am wondering quite some time now, whats the matter with this "Lips" thing?

@JanBeta 6 лет назад

It's just a joke. I'm not a big fan of advertising (obviously) so I tend to obfuscate brand names on my stuff all the time. I put some electrical tape over the PHILIPS logo when I realized it might be funnier to leave the "LIPS". ;)

@RogerBarraud 5 лет назад

It's "Farad", not "Faraaad"... ...since the unit is named after Michael Faraday.

@AppalachianMotors 6 лет назад

I want one of these so badly is it worth importing these to the us and buying the necessary converters yo play them on a ntsc tv

@JanBeta 6 лет назад

Try looking for a TIMEX Sinclair one. They are NTSC clones that were built for the American market. Some compatibility issues, but not too bad as far as I know.

@AppalachianMotors 6 лет назад

Thanks!!! I will look into it