Wednesday, 6 November 2013

ZX Spectrum +/48k - Lower 16K RAM Repair

So my spectrum's lower 16K RAM failed about a year ago. Basically the machine would not load programs properly and sometimes freeze on power on (Black screen with grey border). Initially I thought the internal power circuit was playing up causing instability, but I checked it wasn't. All the voltages were present and stable. Next I replaced all the 30 year old electrolytic capacitors thinking this would sort the problem. But still the same issue persisted. Lastly I did the "PRINT PEEK" basic commands stated over on the Spectrum repair guide, and confirmed that the one of the lower 4116 DRAMs had failed.