BVH2000 wrote:Hello All,
Been a bit busy last couple of weeks so the cow went on the back burner.
Over the weekend I got the horrible RIFA caps in the psu swapped for some decent class x and y as appropriate.
My thoughts have turned to fabricating a cover plate for the bottom memory card rack. Brushed aluminium plate is easy to come by, but I'm struggling to find the matching "card handle " strip a sample of which is shown below
I have tried the Rittall website but this profile of handle seems to have been discontinued. I wondered if anyone out there has a better knowledge of 80's sub rack case makers and can point me in the right direction ??
ppppenguin wrote:In the light of the smoke reported by BVH2000 and the smell I'm getting I really ought to check for iffy suppressor caps and mains filters.
BVH2000 wrote:There is no sync on Y on my cow either and I have not found any obvious links etc to enable it. I assume station mixed sync was always readily available for pal coders and monitors so no need to combine it for its original use.
Cathovisor wrote:BVH2000 wrote:There is no sync on Y on my cow either and I have not found any obvious links etc to enable it. I assume station mixed sync was always readily available for pal coders and monitors so no need to combine it for its original use.
That'd be correct. The practice, in my workplace at least, was for unencoded signals to be distributed RGBS - YUV(+S) was quite a rarity. Syncs and Blanking were distributed pulses from CAR (along with VAS and CSC, and earlier - LD and FD) and were fed into the coders, so there was no need for any unencoded piece of kit to produce syncs on its output.
I suspect the reason the Museum's has been modified to a captive mains lead was simply to get rid of the (deprecated) XLR-LNE easily. Punching the panel to take a regular IEC inlet would seem to be a good idea.
ppppenguin wrote:A few more observations.
The PSU is a heavy module with 3 main parts inside. There is a big unit, with huge heatsink fins on the back which I think is the +5V PSU.It's an Advance MGT400, looks like this one: http://www.ebay.co.uk/itm/Advance-MGT40 ... 7675.l2557 though I'm pretty sure the one int he COW is doing a 5V output. Possibly a switchmode with a conventional 50Hz mains transformer. Then there's another packaged module with markings I don't fully understand. Marked NSR 512-9 LiPC. This would appear to be a switchmode -5V regualator: http://www.datasheetarchive.com/dl/Data ... 285489.pdf The final module is a PCB with a toroid (filter?) and a few other bits on it.
ppppenguin wrote:The Museum's COW has clearly been modified. The telltale mounting holes of an XLR-LNE are just visible.
Cathovisor wrote:The whole thing would have been the PS4/11 - mounting frame, filter, 'commercial' power supplier, the lot.
ppppenguin wrote:The front panel of my power supplier is marked PS4/29. It looks like something has been scraped off and 29 put in its place.
Neil, does your power supplier make little buzzing and singing noises?
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