Beogram 4500 platter motor keeps spinning

[Jonathan McCall]

Having re-capped the main PCB and RIAA boards everything is back together. I do however have one issue which needs the collective wisdom of the wise old elves on the forum.

My main platter motor keeps spinning, whether the unit is switched on or off, or the Phono selected on the main system or not.

Bit of a head scratcher, but I’m unable to test everything else until this is sorted.

The case is flipped open, no cartridge fitted and solenoids seems to work fine.

Help !

Cheers

Jonny

[Dillen]

TR4 or TR5 shorted.
Replace both (BC337).

Martin

[Jonathan McCall]

Smashing – many thanks Martin. Are all transistors pretty much the same, or are some better quality than others ?

[Jonathan McCall]

Replaced TR4 & TR5 today and now have the platter starting and stopping as it should.

Im now into an issue with the tonearm height and getting it balanced, so will post separately.

Thanks for the heads up on replacing the transistors – really helpful.

[Author]

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