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I own a Electronica-bk-0100-01. I have only got around to connecting it up. Before that I opened up the system, checked for bad tracks, obvious issue etc. I also checked the end to end of the ribbon type cable connecting the KB to the mother board.

(this is a non membrane keyboard), so it has been switch cleaned etc.

When I power up the system I get 2 beeps and the standard basic prompt/screen but also a "Z" character on screen. I cant get any keys to go into the basic interpreter - also there is no @beep@ on a key depression.

I dont have an english language manual nor have I yet found a circuit diagram.

Does anybody have experience of this issue - or can you comment. I though the "Z" key might be stuck down, Mechanically it is not, but I may have to go meter the switch connector?

Any thoughts/experience?

  • Welcome to Retrocomputing.SE. I hope you stick around! The Электроника БК are interesting machines to be sure. Don't forget to vote, and accept the answer by ticking it if you found it helpful. – OmarL May 6 at 8:32
  • I have a wee museum in Inverness for DEC Digital PDPs - I have a Saratov(sp) front panel that I am bringing back to life with the help if Jorg kit. I have been sourcing Russian transistors to fix it. The Electronika and it are kind of "off the side". Covid has really screwed up my opening plans! – iainmaoileoin May 7 at 10:28
  • When covid blows over I'll be sure to pay you a visit. Seems interesting. My Gaelic by now is so rusty. But in case you need any help with Russian, I'm also active(ish) on Russian.SE. – OmarL May 7 at 11:44
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It's possible your Z key is stuck (or perhaps there's a short, or the switch is buggered, or something like that). That would explain the two beeps and the fact a Z appears on the screen when you turn it on.

Better measure the keyboard switch to rule out a problem with it, and also the corresponding trace on the board if you can find it.

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  • Aidh, switch was eh knackered - shorted. Cant get inside it (easily) can see the innards after the keycap removed - vanes broken but that would not cause a short. Hunted for the wee missing bits - no luck. So I track cut ;-( I now have a working system - but with no "Z" key. – iainmaoileoin Apr 30 at 21:51
  • @iainmaoileoin You might get some luck asking here: zx-pk.ru/forums/59-bk-0010-0011.html. It's a Russian-speaking forum but I think they will be happy to help an English-speaking guy (the forum UI itself could be easily switched to English with a drop-down at the bottom of the page). Or, if you want me to, I could post there and refer to this SO thread asking for further guidance. – DmytroL May 6 at 8:30
  • I will give them a try. Unfortunately I have absolutely no Russian only Gaelic and English. If I knew a wee bit more about the switch innards I may be able to fix without stripping the whole beast down. – iainmaoileoin May 7 at 10:23

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