BeoGram

Re: beogram 6006 problem

chrisbou — Thu, 11 Dec 2008 14:56:24 GMT

Welcome back Geoff!

The voltages were a little to high but not by much,maybe up to 1 volt.On either the forward or the rewind button(sorry,I don't remember which)even when I ajusted the voltage,it was still a bit(about 800mv or so) high but worked anyway.

On the other side,I could adjust it higher or lower than needed.I didn't want to take the switch apart since it worked anyway.

Lack of time or lazyness maybe.Probably the latter.

Thanks again for your help.

Chris

Re: beogram 6006 problem

geearr — Mon, 08 Dec 2008 02:03:02 GMT

Hi Chris

I have just come back from an overseas visit and have been catching up on all of the news. Glad to see that you have finally had some success, as usual it makes all of the hard work worth while. I must admit that I would never have related your problem to the operation of those two keys. I have set up the voltages on them several times but usually after the bulbs have blown. Would you be able to clarify whether the voltages that you found to be incorrect were too high or too low and by roughly how much?

Well done again

Geoff

Re: beogram 6006 problem

Dillen — Tue, 02 Dec 2008 03:19:15 GMT

You can simulate the fault by holding the >> button slightly depressed while starting the Beogram.

The slightest touch of the button will raise the tonearm (or keep it from lowering at startup) and have the carriage moving slowly to the right.

Good job !

Martin

Re: beogram 6006 problem

chrisbou — Mon, 01 Dec 2008 17:59:35 GMT

I CAN'T BELIEVE IT! IT WORKS!!

Thank you again for all your support.I've been repairing electronics for twenty years but I have to say that I never could have don this without you.

If you have time,I wish you can explain to me why the adjustment of the keys solved the last problem.I know the belt and the cleaning of the rod cured a part of it but the adjustment would not have been one of my choices for sure.

thanks again Martin & Geoff

chris

Re: beogram 6006 problem

Dillen — Mon, 01 Dec 2008 02:09:00 GMT

Check the adjustments of the << and >> keys. It's mentioned in the service manual and is just about the only thing that can cause this fault.

Martin

Re: beogram 6006 problem

chrisbou — Sun, 30 Nov 2008 23:41:00 GMT

Hi Geoff

Yes,the motor goes into reverse very slowly and when it stops,there is no change in the coil voltage.It takes about 30 seconds for the arm to back up at total stop.

I'll try lubricating at the other point see what it does.

I'll keep you posted!

thanks again

chris

Re: beogram 6006 problem

geearr — Fri, 28 Nov 2008 22:44:51 GMT

Hi Chris

Glad to hear that you are making progress. The manual asks you to put some lubricant at five spots on the spindle and the in their case, they seem to use a mixture of two products to develop an oily consistency. Since I have no experience with the lubricants that they quote, I simple put a drop of light machine oil at a few places down the spindle and it seems to work OK. Others may have a different idea.

Does the motor actually go into reverse when the arm backs up or is it just releasing some compression in the system? When it reaches the park position over the disc, are you getting any change in the coil voltage at all?

Geoff

Re: beogram 6006 problem

chrisbou — Fri, 28 Nov 2008 20:23:23 GMT

Hello!

I changed the belt and there are some improvements.The carriage now reaches the disc exactly where it should but then,it starts to very slowly back up about a millimeter or two and the arm doesn't want to drop even if I make it travel to the middle of the disc.No clicks either.Should I put some grease on the threaded rod also?I put some on each end.

thanks again for all your support.

Chris

Re: beogram 6006 problem

wongss — Fri, 28 Nov 2008 00:37:46 GMT

Dear Martin,

The lamp is working....

Re: beogram 6006 problem

chrisbou — Thu, 27 Nov 2008 19:46:38 GMT

Hi!

Is the optical tracking sensor the one that detects the small movement of the needle at the base of the carriage?If so,when I made the arm drop by putting 5 volts on the coil,the arm motor was running slowly and doing what it is suppose to do.The light works fine.It's funny that the carriage would advance slowly if I make the arm drop but refuses to do so after the initial few seconds when it reaches the disc.

As for the rod,I have cleaned up everything including both ends.I still didn't put the carriage back on the rod.I wan't it to be free wheeling and the rod is very easy to turn with no drag at all but I still have the problem.I didn't get a chance to try a new belt yet but I plan to do so tomorrow.

And yes Geoff,everything is fully intact.I did inspect the underside of the carriage to check for cracks or anything odd but everything is perfectly fine.

chris

Re: beogram 6006 problem

geearr — Wed, 26 Nov 2008 04:39:14 GMT

Hi Chris

Never give up, all it takes is lots of time!! I have checked the voltage on the motor when it is going to the start position and it seems to be between 8 and 9volts. Looks as if your motor is doing its job. So if you are happy that the initial park position is OK and the motor is able to reach the correct speed, it might be time to look at the setup of the pulse counter. Is your fully intact? I had a problem where the plastic arm was cracked and this left the board floating quite a lot. I had to make a spring arm to keep it in its proper position.

Keep at it

Geoff

Re: beogram 6006 problem

Dillen — Wed, 26 Nov 2008 02:23:01 GMT

wongss; Sounds like the optical tracking sensor (at the base of the carriage) is faulty, probably a burned lamp - or the interrupter is badly adjusted.

chrisbou; Sounds like you are closing in on the problem. The voltage seems fine and the slow rotation of the motor to get the carriage to the exact drop spot is correct, we just have to get the threaded rod to follow the slow rotation which is where seized up things turn up. Take out the rod and clean at both ends where it rests in its plastic holders. Dust off the opto elements while in there.

Martin

Re: beogram 6006 problem

chrisbou — Wed, 26 Nov 2008 01:25:36 GMT

Hi Martin!

I removed and cleaned the threaded rod with a degreaser and a toothbrush then I put everything back in place and the arm does move a little further(about 2 mm)but I still have the problem.I decided to try the same experiment with the arm removed leaving only the threaded rod.The result is the same so the carriage is not dragging.By the way,I did try to remove the belt as you said and the motor does run but very slowly and weakly.

I checked the voltage on the tangential motor and when I press PLAY,it is 8,2volts.Is it enough? I'm thinking of trying some other belt size althought it seems adequate just to see the effect.

I'm not giving up!

Bye and thanks!

chris.

Re: beogram 6006 problem

wongss — Tue, 25 Nov 2008 23:56:26 GMT

I have a Beogram 4002 type 5511 and encounter some problems maybe you guys here can help/advise me.

1) after the arm drop down to play LP, it will just static, so the music is keep repeating at the same position.

2) left channel no sound or extremely low volume

Any advice on this?

The motor (for the arm) can move by pressing >> or <<

Re: beogram 6006 problem

Dillen — Tue, 25 Nov 2008 03:00:59 GMT

When the tonearm halts, try removing the belt without disturbing the position of the opto interrupter and watch the motor. If it rotates, the tonearm carriage doesn't move freely enough. Clean the threaded shaft and the nylon bushing under the carriage. Add a little fresh silicone grease and it'll be fine.

These Beograms count pulses, it's not timed. If the correct number of pulses can't be reached, it won't lower.

Martin