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.




















Wednesday, 10 April 2013

Getting antique video cameras working – Part 2

So here's part 2 of getting antique video cameras working. In part 1 I discussed powering up the Hitachi VK-C600 camera, in this post I'll discuss the Sony HVC-4000p. 



















Wednesday, 30 January 2013

Sony Handycam Camcorder Repair: Re-Capping


Few months back I picked up a Sony Handycam Video 8 camera (CCD-TR333 circa 1993) cheaply off ebay. I brought it to transfer a load of family videos to the computer, for archiving to DVD. The camera was working but only in playback mode. It was very temperamental and would only play tapes ok after a few minutes of power on. The camera side was working but it would not record very well, only a wobbly picture with varying amount of static. Thankfully I was able to capture all our tapes ok with out the camera dying completely.

















Thursday, 10 January 2013

Getting antique video cameras working – Part 1


I acquired a two old early 80's video cameras to play with recently. An Hitachi VK-C600 and a Sony HVC4000P. These are the old type that use a tube as an image sensor. These cameras required to be connected to an external VCR to be used. As well as recording video from the camera, these also provided the power supply to run them.