ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
Hi everyone,
Just joined the forum so hope I get the etiquette right !
Anyway back to the subject - I have just bought a 5000 system for restoration and am having a little difficulty with the Beogram 5005 turntable in that it will not track across the record whilst playing. It cues up ok (i.e. starts to play when you press play), the arm moves freely and you can move the arm back and forth by using the buttons. I have checked the belts and the small one from the servo motor to the arm had come loose soI refitted that but not improvement.
I have read somewhere (on here I think !) that it might be the servo bulb/light sensitive resistor but wondered two things :
1) How do you prove this ? i.e. should be able to see a light coming down from under the arm (can't see one on mine) or is that too obvious ?
2) Where can you get replacement parts for these bits ?
Thanks in anticipation
Ian
The bulb mentioned is a photocell and detector in the box at the rear of the arm carriage. You cannot see it from the outside - martin (Dillen on site) is the man who can probably help.
Peter
Welcome to Beoworld !
The "sensorarm" is not a sensorarm on your deck. It's merely there for looks and it's not supposed to shine any light onto the record.(It's on the wrong side of the tonearm to sense anything anyways).
Record size is determined by weight and tracking while playing is done using a lamp and an LDR, both sittinginside the carriage housing.You cannot normally see the light from the lamp since the opto system is shielded from ambient light but if youtake off the black carriage housing, you can see it shine through the channel for the interrupter arm that follows thetonearms sideways movement.A broken lamp and/or a bad LDR is my guess in your case.I may be able to help with parts but diagnose the problem first. There could be other reasons.
Do be VERY careful when taking off the black carriage cover, - the very thin wires from the tonearm is glued in placeunder it and they can occasionally stick to the cover instead. They WILL be severed if you are not careful.
Martin
Hi,
Thanks for the response, I have had another look at my arm and there does appear to be a sensor approx half way down the arm on the underside (facing the record) - is this the one that is being referred to as being just for looks ?
Also is there a particular way to get the carriage cover off ? - does it just lever off or is their a particular way to get it off ?
And finally, and this may be a stupid question but here I go ! - what am I looking for once I get the cover off ?
Thanks again
Obviously, you will need to open the Beogram into serviceposition (with all that takes).The carriage cover sits with three screws.The entire arm next to the tonearm is for looks only. The only thing it carries is the red 33/45 lights.Don't get me wrong, but from what you write, I would say you are not the person to fix this.It's far too easy to do more damage than good.But it shouldn't be a very expensive repair.Where are you based?
I am in Carlisle, Cumbria, Uk
Thanks
I have the carriage cover off now but am unsure as how to tell if the bulb / resistor is at fault - should I now be able to see the bulb and tell if it is illuminated ?
Sorry just realised the bulb and sensor is under another cover - taken that off as well now and no sign of life from the bulb, the light sensor resistor looks a bit "weepy" as well - guess this might be the problem?.
They appear to be soldered in so might be a bit tricky for me to repair as I am ok with a screwdriver but not really any good with a soldering iron.
Because of this will I need to replace entire arm unit ?
No, you will only replace the lamp. (replacing the whole assembly is an even bigger task).Put a voltmeter across the lamps leads to see if it gets power.If it gets power but doesn't light up, well, then the lamp has burned.Yes, it's soldered in and replacing it is not the easiest task - and it will require a bit of adjustment after replacing - hence my comment above. Work carefully.
Thanks - is it a 5v supply to the bulb ?(just to make sure I set the voltmeter to the right range)
Can you supply the replacement bulbs Martin ?
I seem to remember it being a 13.8V lamp, so the supply (unloaded) would perhaps be 14-16V or so.I am not sure if I have those lamps. I will have to check when I get home.
I can't seem to detect any voltage at the bulb and the a basic visual inspection of the bulb seems to indicate that the bulb filament is intact (although my ageing eyes may not be 100% on this !)
Any more suggestions as where else to look please ?
Hi Martin,
I have had a B&O engineer look at it and he has come to the conclusion that it is probably the LDR (bulb and other items check out OK) but he does not know where to get a replacement - is this something you may have in stock ?