Problems with a Beogram 4004

15 replies
GG
Offline
Guillaume Gonzalez
Bronze
Posted April 5, 2026 at 10:42 GMT
#1673137
I've made progress on the circuit board.

After replacing 8D2 and 8C1, I realized I have a problem with the relay's ground connection. When I solder a wire from the relay's ground to the ground of connector P9, the sound returns.

Could this be caused by 8IC1?

Thank you for your help.
Mark-sf
Offline
Mark-sf
Bronze
Posted April 7, 2026 at 17:59 GMT
#1673149
If the base of 8IC1 is getting .7V when the arm is set down, then then it should be effectively “grounding” the end of the relay which is what you did manually. If that is not happening it is bad.
GG
Offline
Guillaume Gonzalez
Bronze
Posted April 7, 2026 at 19:33 GMT
#1673152
Thanks again for your help.
I'm going to replace 8IC1 that I've already ordered and see how it goes.
Otherwise, I'll replace the relay.
I'll keep you posted.

It's definitely a pleasure to finally hear some sound from the turntable
GG
Offline
Guillaume Gonzalez
Bronze
Posted April 13, 2026 at 21:18 GMT
#1673182
Replacing 8IC1 finally solved the problem; the sound is finally back! Thank you so much for your help.
Mark-sf
Offline
Mark-sf
Bronze
Posted April 14, 2026 at 16:22 GMT
#1673183
You’re welcome. Enjoy!
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