Reply To: What are you working on now?

[pl212]

Restored DataLink functionality on my Beogram 6500 — this had mysteriously stopped working, despite other functions being OK. Tried it on different systems (Beomaster 6500 and Beosound 2300) with the same result, and validated that DataLink was working on those two systems by using my old 1984 Beocord 2000.

Recapped the RIAA board — perhaps that would fix it? Nope — and not surprising given DataLink just takes a jog through that board without any passives in the way.

Test continuity all the way from Pin 7 to the logic chip? No problems there…

What fixed it was… apparently replacing the 2.2μF cap on the main board? Or at least that’s the only one of the two caps that had a problem, with an ESR of 25. The capacitance itself was fine at 2.12μF, and the 470μF axial cap I also replaced was also OK at 447μF and 1.6 ESR.

Bonus — can you find the spurious magnet hanging out in the attached photo? Pretty sure it was left over from someone servicing it before; the actual magnet inside the electromagnetic relay was not missing so this is an ‘extra’!

• This reply was modified 1 week, 2 days ago by pl212.
• This reply was modified 1 week, 2 days ago by pl212.

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