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 guys,
I am currently restoring two Beomaster 1700 units. They were built from four units that all were too busted to be restored; so four became two. These two are now technically working flawlessly, both units had a complete overhaul and several upgrades.
But there is one thing I can't seem to fix and that is the threads and sliders. I have built new holders for the main assembly and tracks, this now works as it should. When I move the main tracks (either left or right) the assembly is moving.
What isn't moving is each individual track (left or right). I can press and hold a key, move the main tracks up or down, it doesn't move the individual track (for instance bass or FM1). Sometimes it will move a little but but never smoothly or consistently. I know that the pressure is correct, these tracks should be moving. They are not stuck and I can easily move them by hand directly.
I have a feeling I must be patient number 999 asking this same question. This appears to be a common failure in my opinion, but I don't want to break these machines by just disassembling the element that holds each track.
Can anyone point me into the direction I should investigate?
Kind regards,
Bert
Hardened rubber washers inside the clutch assy.Lack of button tension - fit something between the buttons black actuator arms and the white clutch release sliders to add tension.
If the volume also doesn't regulate, replace the spring at the side of the clutch housing with a tighter type.
Martin
Hi Martin,
Yes this seems to work somewhat for the left tracks (volume and controls) but not for the right part. I have extended the arms in such a way that the tension on the white release sliders is at maximum. But that still doesn't make them move. I have tensioned the right main thread, it has ample tension and I can see the mechanism moving when no key is depressed.
Sometimes a track will slide a bit, up or down. But it is always intermittent and very small increments. Even though I can easily move the little tracks by hand easily when I remove the top section from the housing.
This all just seems like a really, really badly designed unit. I've had to 3d-print at least 3 broken plastic elements already (for connecting the tuner assembly) and had to repurpose several metal objects from my kit-box as part of creating a hanging frame.
Hi,
I dont know that unit so I may say silly things, but after looking at the service manual could it be the string slipping?
Hmmmm, where in the service manual does it say this? I only know of 1 string which is the pulley for the tuner (AM tuner part). As far as I can tell the tracks for each of the slider can be seen on the bottom of the top assembly. They are threaded tracks that run around a wheel inside the casing. When you press the button (for instance FM1) and keep it depressed, the white element should somehow create the tension (?) to move the track. Of course this whole assembly could slip, being that there is not enough tension to make it move.
Question is what to do about it? Disassembling this seems like an almost impossible task. It seems easy to lose things in there or to misalign the little plastic parts.
I think matador43 is talking about a different Beomaster 1700.You can take apart the clutch assy,First take out the complete module with the potentiometers etc.Then losen the black straps from the sliders with the LEDs.Remove the two hairpin locking springs and it will all come apart quite easily.
Sorry, as the symptoms you described are the same I had with a tuning string and I saw one in the service manual I thought it may be helpful.
Useless post again, apologies…
Hmmmm. Okay I have one of these modules in front of me now. Using a finger I can move the individual tracks.
On visual inspection what I think is the problem is, again, due to the rather cheap build quality. I think that the tension inside the rotating element is actually fine. But the little black wipers that the white element pushes downward onto to build the external pressure on the track, these seem to be cracked. Being plastic instead of metal, I suppose time and user interaction degraded the plastic.
Now the black plastic wiper doesn't do anything anymore. When you press down on the keys, the white element pushes down with enough force but the wiper just flaps a bit. There is no strength in them, I think if I was to wiggle them a bit they would snap right off at the base.
So. I think this ends this restoration unfortunately. I have already built too much 3d printed elements already and these black wipers are prone to the same forces. Plastic is not a good choice here and 3d printing a new set will just be a short term solution.
Damn I wish B&O designed some of their stuff better. This receiver wasn't exactly cheap or anything :-(.
There are no useless posts. Just like there are no useless or dumb questions, only useless and dumb answers.
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