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This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
Hello all you Beophilians. I have a Beomaster 6000 that works fine except with the volume control. I've opened it, and noticed that the axis of the motor of the volume control is blocked. What should I look first to get it released?
Hi,Blocked how? Can you post a picture of the problem? Does the motor try to turn? Do you hear it running? -sonavor
Thanks for the quick reply. The wheel won't move, even when i try to move it by hand. Totally blocked, even if it was functionning before I did some cleaning. I don't hear the motor running. But when I move the wheel with the wire attached, the volume is functionning up and down. It seems the axis of the motor is stuck. Here's the picture.
The black box is a gearbox to convert the high rpm from the motor to the low rpm required to adjust the volume. You will not be able to turn the motor by turning the black wheel and you will damage the gearbox if you apply too much force. I would start by checking you are getting a voltage across the motor inputs when you try to change the volume. This will give an indication of whether the problem is electrical with the motor servo control or, more likely mechanical with the motor/gearbox (possibly fixable by stripping and cleaning).
Thanks Bristol for the reply. I didn't apply too much force trying to rotate the wheel, I know these old B&O ladies doesn't like to be forced . I read 6,72V with the up arrow (volume up) and 6,32V with the down arrow (volume down) and of course 0 when buttons are not pressed. So there's hope?
It sounds like the servo circuit is doing the correct thing electrically. I think you need to either source a replacement motor (difficult) or repair the one you have. I have repaired two in the past. It was not complex, but did take some time. Remove from receiver, dissemble, clean, lubricate and reassemble. On one motors I repaired the brushes (a wire strand) had failed and need to be replaced.
Well, I think i will do that and i'll let you know the results. Is the gear box can be opened too? Hope i will not need no special tool...
Yes - I did open the gearbox on mine. I think I just used a small screwdriver to push back the clips. Be careful as plastic of this age can be fragile. There are some small pieces inside the gearbox so don't drop any.
With both that I repaired, the issue was with the motor and not the gearbox. Whilst a full strip down and clean would be best, you might try seeing if some switch cleaner sprayed around the brushes and commutator would get the motor started, i.e. tarnish or dirt in this area is stopping the motor from starting. Once you have the motor out and have slid off the metal can, you should be able to see into the motor around the brushes area. Try spraying and turning the motor by hand (e.g. a wooden cocktail stick pushing the motor round and not trying to turn it via the gearbox).
Bingo! A gearing had moved inside the gearbox and was blocking the motor. Cleaning + greasing and I have my volume back.Mucho thanks to you, Bristol . I have now a minor problem with that motor that continues to spin when i put my Beomaster in stand by. It stops only when I put the volume preset level at his maximum. Any idea?
Well done! I hope you get some extra pleasure listening to the BM6000 knowing you have repaired it. I think the BM6000 sounds and looks great.
The running on issue sounds like the electrical servo circuit needs adjusting. The process is set out in the Service Manual in the downloads section of this site. At least that is where I would start.
Do be careful with all the connectors on the PCBs.. They are easy to strain so the electrical connections onto the board become unreliable. This happened to me and that system showed some bizarre behavior which had me scratching my head for a long time, but disappeared when an apparently unrelated connector was repaired.
Good job guys!! Beoworld rocks!!!
Bad trimmers and/or bad adjustment of trimmers on the volume control board.
Martin
I 'll check the connectors and trimmers and if it's not enough, well, I should resign myself to go down to that "service manual, chapter 5-5, volume adjustement" and try to understand what "step 0" and "step 30" means...here again, it would be better with a little help from my friends . Anyway, thanks to you all, gentlemen
Step 0 and 30 are some of the buttons on the front panel.
Another thought that might be an easy check is to see if the belt is slipping so that the volume potentiometer is not quite reaching the target point and so the servo keeps the motor running. The belts become less grippy with age. Martin has new belts if you need one.
Too much looking inside makes me forget to look at the frontside!
Yes, I have noticed the belt was a bit sliding after I had put out the motor. So I cut 2/3 millimeters of the belt, re-glue it and put it back in place. Working fine, but it's cool to know that I would had find such piece here @ Beoworld.