Search found 6 matches
- Fri Dec 07, 2018 8:09 pm
- Forum: Hardware
- Topic: Return of the (slightly less) faulty ZX Spectrum
- Replies: 3
- Views: 1548
Re: Return of the (slightly less) faulty ZX Spectrum
As usual the help I'm getting is highly appreciated and helpful. Anyway here's an update. I might have actually done it! I've replaced the TR4 and TR5 as suggested and I've also changed all the caps. Now I get the proper voltages on the DRam and I seem to get a stable picture, though since I haven't...
- Sun Dec 02, 2018 8:17 pm
- Forum: Hardware
- Topic: Return of the (slightly less) faulty ZX Spectrum
- Replies: 3
- Views: 1548
Return of the (slightly less) faulty ZX Spectrum
A few weeks back I asked for help with a problematic ZX Spectrum ( https://spectrumcomputing.co.uk/forums/viewtopic.php?f=22&t=1107 ) and it was pretty much decided that the voltage regulator was faulty and that it might have damaged other components as well. I've changed the regulator and the u...
- Sun Nov 18, 2018 10:23 am
- Forum: Hardware
- Topic: Help needed with two Spectrums
- Replies: 8
- Views: 2115
Re: Help needed with two Spectrums
Nice rant! :D However you are probably far more correct than I could ever hope to even understand so I won't begrudge you it. ;) Anyway, it certainly seems like the voltage regulator is doing unspeakable things to the computer. For now I'll shelve this unit and treat is as spares, but I might try to...
- Sat Nov 17, 2018 10:08 pm
- Forum: Hardware
- Topic: Help needed with two Spectrums
- Replies: 8
- Views: 2115
Re: Help needed with two Spectrums
I should probably also mention that I'm using a high quality replacement PSU for the unit. The original one gives 13V out and I would rather avoid having it fry the computer. In fact I have noticed a marked tendency for old console and computer (I currently own 153 machines) PSUs to produce a lot hi...
- Sat Nov 17, 2018 9:47 pm
- Forum: Hardware
- Topic: Help needed with two Spectrums
- Replies: 8
- Views: 2115
Re: Help needed with two Spectrums
Very helpful stuff, thanks in advance even if the unit turns out to be a waste of time. I read through pretty much everything that could be found in the page you linked to and did tests based on that: The edge connector Pin 3B/+5V: +7.53V Pin 4B/+9V: +9.22V Pin 20A/-5V: -7.47V Pin 22A/+12V: +9.21V 4...
- Sat Nov 17, 2018 10:57 am
- Forum: Hardware
- Topic: Help needed with two Spectrums
- Replies: 8
- Views: 2115
Help needed with two Spectrums
Hello Spectrum enthusiasts! I am need of assistance concerning two ZX Spectrums in my possession; A standard 48k model and a plus model. The 48k model was bought recently and I knew it likely would work poorly. And sure enough, the power supply needed some work and the faceplate was an awful mess. A...