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  Fidelity Electronics Elite a/s board, Budapest 1983 version
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   Author  Topic: Fidelity Electronics Elite a/s board, Budapest 1983 version  (Read 878 times)
sc9
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Re:Fidelity Electronics Elite a/s board, Budapest 1983 version
« on: September 21, 2009, 09:07AM »
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Thanks Mychess!

My computer has no battery under display, but there were holes for one. I put a 6.3 volt, 10,000 uf capacitor there (fits perfectly) and it now holds memory at least overnight. Capacitors are much more reliable than NiCads, which the latter only last about 5 years. Also, one of the 2, 470uf caps by the  power side of the board had lost its seal, started leaking brown stuff, the rubber was bulging near the positive terminal on both 470uf caps, so I replaced them. Now the sound is loud as it should be, and it powers up properly. These caps must be for the sound processor, and when it is working normally, each cap has about 10 volts across it.

Finally, I added a 3300uf cap in parallel to the 2200uf cap, to make it more immune to quick power spikes. I've had several Fidelity units where that main power supply capacitor loses some capacity, making the units sometimes lock up when some power spike or droop occurs on the same circuit.

Regarding the pieces, I bought old wood chess pieces from ebay for $18, drilled out bottom lead weight, put round magnets (observing the same polarity as original as the magnets in the pieces) in the king and queen, glued the magnets in place w/ green felt, works good, king is a good match to the other king, but the queen not so good  - but ok for everyday use.

I'm happy now. Thanks for the suggestions.

Hope these suggestions help others with similar problems with their Fidelity Elite A/S.
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Re:Fidelity Electronics Elite a/s board, Budapest 1983 version
« Reply #1 on: September 3, 2009, 11:11AM »
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Hello,

The "Sanyo Cadnica" backup is under the 4 digits display.
You can see a small  "+" between the 18 and 8 pins chips at the left of the display (opposite of the radiator).
If you can see it, you don't have it (it is big, like 2 R14 batteries).

I'm not sure, but I think I saw 3,6 Volt on it

With Fidelity ;-)
Mychess.
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sc9
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Fidelity Electronics Elite a/s board, Budapest 1983 version
« Reply #2 on: September 2, 2009, 12:53PM »
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Does anyone have any incomplete piece sets for this? My game is missing the white king & queen, and I'd like to complete the set.

Also, I have the following problem with it. Does anyone have any suggestions? I found if it is unplugged more than a few hours, the CPU latches up and the computer's voice gets real soft. I suspect the built-in NiCd is bad, but I don't know where it is. After it is plugged in for a while, it is possible to reset game holding GC when plugging in, and the voice gets louder, but probably not as loud as it should be. The computer tone is real loud, so the speaker tests out fine.

I've removed the back and both circuit boards, but I only see electrolytic capacitors, no NiCd batteries. The owner's manual says there are NiCds to preserve the memory, but I can't locate them. Any suggestions would be appreciated.

Thanks.
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