I started coding with ZX Spectrum at the age of 12, so it wasn’t difficult to choose what I would start with to fix and refurbish retro computers. I already have quite a few Spectrums, but haven’t bought one for a while; but while scanning eBay I came across a very cheap ‘untested’ listing and couldn’t resist it. I was hoping for a complex repair that would stretch my diagnostics and repair skills.
![ZX Spectrum](https://www.bitwrangler.uk/wp-content/uploads/2023/08/IMG_20230819_135927.jpg)
On arrival it was very well packed and looked in pretty good shape. Opening it up, I found an immaculate Issue 3 board with no signs of previous repairs – how disappointing. Powering it up with a diagnostics card showed no errors, although I couldn’t get the RF output working; this is not unusual, the RF module frequently doesn’t work.
For the first update I did the standard capacitor video composite mod – this sorted the lack of a display, although it suffered from lots of interference. Again, this is not unusual and is usually fixed by changing the capacitors. You sometimes need to change a couple of transistors as well.
![](https://i1.wp.com/www.bitwrangler.uk/wp-content/uploads/2023/08/IMG_20230819_1520342-1.jpg?ssl=1)
![](https://i2.wp.com/www.bitwrangler.uk/wp-content/uploads/2023/08/IMG_20230819_160157-1-rotated.jpg?ssl=1)
![ZX Spectrum updates](https://i0.wp.com/www.bitwrangler.uk/wp-content/uploads/2023/08/IMG_20230819_1557522-1.jpg?ssl=1)
With the mods complete the picture problems disappeared – one of the cleanest video displays of all my Spectrums.
![](https://www.bitwrangler.uk/wp-content/uploads/2023/08/IMG_20230819_155747-1.jpg)
The only thing left was a good clean – even the keyboard membrane worked. I decided to keep this unit as close to standard as possible so didn’t change the regulator and remove the heat sync, which I would normally do.
I already have issue 2,4 and 6 versions of the Spectrum, so this adds nicely to the collection, even if it didn’t need any fixes.