[hcraig244]

With all due respect I found the above very funny….it’s typical behaviour for one of these decks! they can be so frustrating…I have spent many hours going over and over a fault finding exercise and getting nowhere, and as you say things can seem to get worse despite your best efforts….your issue sounds like more than one problem, possibly both being intermittent which are the worst kind.

My advice, for what its worth, would be to confirm the p0wer supply levels for 6 and 24 volts at the voltage regulators….unstable supplies can wreak havoc on the logic board, a failing/leaking smoothing capacitor will cause this as will a failing voltage regulator transistor, I have suffered all of these failings. The logic board itself and the associated IC chips are very reliable and seldom fail, my experience has been most issues can be traced to power supplies dropping below the specified threshold and faults associated with the switches and the small plastic spigots that can stick and hold the leaf switch in the wrong position…and also there is the real possibility of a bad connection between the wiring loom and the control panel….I have had one case which was resolved by resoldering all the connections from the wiring loom to the control panel connection terminals….I have no idea which connection was poor or dry but on completion everything came good…..

Stick with it…..send pics and updates as there are lots of very capable members in here who will advise/help you ;¬)

Regards Craig

[hcraig244]

Decided to try this new (new to me anyway) metal epoxy glue, bit more expensive but gets good reviews. Manufactures claim it sets in 5mins and is hardened after  2 hours…..yeah righto! I will leave it set overnight.

most important thing is to re attach the magnet to the frame the right way around, the polarity is important. The magnet needs to be central to the coil but doesn’t need to be exactly central, the precise centring of the core within the coil is the crucial part of the exercise.

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[hcraig244]

Ok

Next step is to remove the magnet from the plate that the core is attached to and remove all the old adhesive from all the surfaces, taking care not to break the ferrite magnet in the process….

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[hcraig244]

Back on the bench the coil still measures a healthy resistance confirming no damage was inflicted during dismantling, always a worry.

As I dont have sufficient epoxy resin to hand I will have to wait until tomorrow to continue the excercise

Craig

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[hcraig244]

Knowing it was loose it was held in a vice by the rear keeper plate and with a quick firm and even lift from the speaker frame the plate and core where left behind…the cone and coil now move freely in and out with no scratchy catching

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[hcraig244]

I was even happier when I measured the resistance of the coil and it came up a little under the specified 4.0 ohms

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[hcraig244]

Came well wrapped up and taking it out revealed nothing untoward, apart from the fact that the cone didnt want to move up or down, also someone had kindly unpicked the dust cap…tricky exercise so I was happy about that ;¬)

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[hcraig244]

Its unlikely that replacing the capacitors/trimmers/lamps etc  provided within a service kit will resolve your issues, its a very good idea to purchase one and carry out said service…however the fault described above will need a little more investigation to track down. Service manuals are available to silver members on the site along with a wealth of guidance from other members, pictures are a great help too….do you have any experience with test equipment such as a multimeter to check for voltages inside the unit? do you have a multimeter?

Craig

[hcraig244]

I checked out the BG4000 recently advertised above on ebay and was quite surprised to see it made over a thousand pounds…..not bad for a sight unseen with issues, a testament to the rising interest in vinyl and the equipment required to listen to it. I may have to increase my home insurance policy to keep pace ;¬)

And thank you Peter for your kind words….your a gent.

Craig

[hcraig244]

If you can deliver it to me in person I will sort it for you….couriers wreak havoc on these decks and will cause more damage, have a punt at it. I can use one of my cartridges to test it prior to your purchasing one if your successful….good luck!

[hcraig244]

Check this out…price will inevitably go up but maybe not as high as £1500

https://www.ebay.co.uk/itm/306021586288?_skw=beogram+4000&itmmeta=01JHJXE2X0X46MFQX97VHCKV6D&hash=item47404ed570:g:pQgAAOSw0oRnetVA&itmprp=enc%3AAQAJAAAA8HoV3kP08IDx%2BKZ9MfhVJKmaF3V1lT2OD8N3cr6gD3y6JtTUnfdRrznZ6bkNI3uwDJryLU6%2FC5%2Bik5SrZJzZHROODoak10JeAtC%2FmDkVfNvlk4WFcMqCJTHdRzijCYT7MNwVDnb3L4uybJk7QUQIRj%2BInaslhTRV%2F2pnHFUZig9QzOcAaumZ9UUlfrF%2B6sbjogbr0rMkjNfpDCy5gDfnVVjAx2s6AW%2Fe9%2BOYNoW1Fvzxhh0yVUOd04CVPvCvaypGPrHu8ugQTSMePt%2Fg%2BsmG%2FHY%2FMFO2xx46UrF%2Fa%2F4SGoOmJeBFJdGgrtqChfFy7PPxTw%3D%3D%7Ctkp%3ABk9SR9CuuN2MZQ

[hcraig244]

I only have experience with the vintage equipment, dont have much interest in the more recent products….I like the Beograms 4000 & 4002, the Beomasters 4000 & 4400 and also the Beolab 5000 mostly..I did have a couple of adventures with the Beocord 5000 with some success….however these are very complicated and heavily mechanically orientated ;¬)

[hcraig244]

I do all my own repairs/restorations….with the service manuals and wealth of support available here its not as difficult as you may think, there are very few options for this work these days…out of curiosity I enquired about repairs at our local B&O shop in Yarm….was told for the vintage items they have a chap locally who will take a look at the item and give an estimate for the repairs for a standard charge of £150……just to look at it!

I advised him if he ever had anyone looking for a competitive price to give me a call…….of course he never has ;¬)

[hcraig244]

Of course I know…..the Beomaster 4400 has long been one of my favourites, I went through a phase of repairing/restoring them on an almost monthly basis such was my infatuation, I think i still have three lurking in various places around the house, however I then discovered the Beolab 5000 vintage amplifier….another massively over engineered work of art with an amazing reproduction…these where also readily available a few years ago at a reasonable price, mostly in very poor condition but with some help from members in here and some degree of patience readily restorable…these too now come with a hefty price tag whenever one comes up….but i’m rambling now……

Craig

[hcraig244]

For me the best match would be a couple of Beovox S45’s…….I find them a very good medium size speaker providing a very nice full reproduction, regarding your intention to acquire a BG4000 you will need to spend a fair amount of money, not so long ago one could pick up a second hand unit needing some repairs for little over £100….now they are commanding much greater sums working or not, they are very desirable however ;¬)

Craig

[hcraig244]

Ok

Your tracking servo is working fine, the servo is only activated after the tone arm is lowered..check out the video Belover posted on U tube for a good explanation of the circuits involved

craig

 

[hcraig244]

The vibrations you mention could be caused by a number of things, I too have used silicone grease on the threaded shaft, however i removed it from the rails as it was collecting dust and although not causing any noticeable issues i felt that it wasn’t necessary, look to the drive pully and its alignment to the motor spindle pully, also check that the threaded shaft is not bent….i have seen this in the past. Regarding the clicking sounds on the return run this will be the slider contact switches getting operated as the arm returns, you wont normally hear this on the way in as the arm moves relatively slowly compared to the run out.

enjoy

[hcraig244]

Ok

So the coil is ripped and in your opinion beyond repair, shame but still not impossible to repair…just difficult. As chance would have it I do have a woofer purchased some years ago when I was going through a period of interest in repairing them, I bought it in case I couldn’t master the re-location of the magnet dislodge problem that has plagued these older speakers due to glue degrading….turned out I was successful and didn’t need the one I bought…so still have it, thing is I cant remember what I paid for it ;¬)

Craig

[hcraig244]

Sounds good to me, I’ll have a go at sorting it. Send me a message and I’ll organize postage costs 👍

craig

[hcraig244]

Starting point may be if the coil is still measuring 4 ohms?

craig

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