Hello, long-time reader, first time poster. I've got a Beogram 4002 (hooked up to a Beomaster 2400 and out through Beovox 3000s), and I'm only the second owner after it was originally purchase in the 70s by my grandfather. It's been a trusty turntable and is still in relatively good condition aside from some wear to the lid.

In the last couple of months, however, anytime I've tried to play anything other than a standard 33 LP on it, the 45 selection button won't work, and the speed doesn't auto-adjust when I play a 7" record. The arm will still drop at the right point for a 7" or 10", but it simply won't change to 45 at all. I've taken a quick look inside, but a) there's no visible damage and b) I don't really know what I'm looking for, so am stuck at this juncture.

I'm based in London, so have tried to get it fixed by the closest recommended repair centre (J&A in Richmond), but they claim it's no longer possible to repair it. Saying that, when I took it in for repair for a separate matter (45rpm speed has always been inconsistent, slowing down at random for a revolution or two, which I've put down to lack of use on the part of the previous owner who had no 45 records, and the belt looks fine), they couldn't fix that either so I'm not entirely convinced by them.

At this stage my options are to try and repair myself (with limited knowledge) or keep it until it finally gives up the ghost (I can't get rid of it yet...there's too much sentimental value attached). I have another turntable that plays 45s with no problem, but would love to troubleshoot this one myself and get it working again. If anyone can pitch some ideas or what to look for, I'd be most grateful.

Thom