Beogram 8002 repair

25 replies
premiumverum
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premiumverum
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Posted October 29, 2015 at 07:40 GMT
#2222807

Hi Guillaume, thanks for the suggestion! I remember reading your thread before when doing research, I'll look in to OPE1 because I too once had some sparking at P2 testing for shorts....

Unfortunately when I did a quick plug in of the BG this morning, everything was back to square one. Only 33 appeared, sometimes 33 2. No response from buttons. My fiddling with the cpu can seems to have temporarily restored some connection that is now gone again.

I'll check OPE1, connector P2 and then get back to testing the signal going to TR21, can imagine the problem lies there. After that it's back to the uP can checking all connections again...

Location: Netherlands

hamacbleu
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hamacbleu
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Posted October 29, 2015 at 10:11 GMT
#2222808
Intermittent problems seems to point to a bad connection somewhere. I remember I had a broken solder joint under 1 of the amplifier of my Beomaster 8000 that I couldn't even see with a magnifying lense. It was like just hovering above the copper trace!

I also remember, on my Beogram, that it would work when put into service position, but wouldnt when placed back to it's standard one! Got crazy about that... Then I found out that the problem was appearing when the whole lid was placed At 45 degrees. It was a bad connection due to a solder joint.

I know it has been suggested since the beginning, but I would check every joints leading to a connector again. Not to forget, as per John suggestion, those bundles leading to the control panel and the CPU. Seems to be a though process since, to check if the machine has become operational again, the microcomputer probably has to be reset each time.

You seem to be patient so you will succeed. And it'll probably become your favorite deck.

Guillaume

Location: Québec, Québec

Guillaume
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premiumverum
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Posted November 4, 2015 at 20:11 GMT
#2222809

Today I went back into the BG. I took a peek inside the microprocessor can to see where I'd start and saw... a broken solder on one of the legs of X1! I resoldered. This explained things too well so I immediately put everything back and started the BG... presto, contact! Could this have been the issue all along? How have I been so blind!?

I'm back to test mode for now, time to see if everything is now solved for good.

The problem with the not stopping arm assembly remains, OPE1 is the suspect. It looks different from the one in your post, it has a red plastic body instead of clear. With the BG running there is 4.95V across it. I tested the LED with the diode tester, it is open in either direction... I'd say that means it is fried!

I hope my local electro shop has a replacement. Could this be the last step to getting the BG working again? Friday I'll have time for some shopping and soldering.

Location: Netherlands

S(
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sonavor (archived2)
Bronze
Posted November 4, 2015 at 20:26 GMT
#2222810

There you go. With my repairs I have seen cases where components have failed and need replacement but so many times the problems are just from broken connections. It is always best to check the connections first as those are the easier and cheaper to repair than new parts.
With the arm assembly problem though...Yes, it does appear to be a case of a component (OPE1) problem. As

premiumverum
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premiumverum
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Posted November 24, 2015 at 19:46 GMT
#2222811

After some thorough testing I think I can safely assume the BG has been fixed.

Next to the bad connector on the crystal I found a bad connection in the pin that connects the ground from the component side of the PCB to the solder side. It caused the uprocessor to sometimes not turn on.

Thank you very much for the help and encouragement! On to a next project, what will it be?

Location: Netherlands

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