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Beogram CD 5500 open and then close?

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Peter8300
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Peter8300 posted on Fri, Apr 30 2021 8:45 PM

Hi,

I just picked up a second 5500 system in need of some TLC.

When pressing open on the CD the tray comes out but goes beck in after about 4-5 seconds.
I have opened it up and cleaned out a lot of filthy dust, but other than that I don't know what to do about it.

Any of you guys have some ideas on how to fix this?

Thanks
Peter

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chartz
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chartz replied on Fri, Apr 30 2021 9:19 PM

Hi, and welcome!

Does it do the same with the remote control?

Jacques

Peter8300
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Thanks Jacques.

Haven't tried with the remote, but after I disassembled much of it and put it back together it seems to work.

Now I have another problem that it won't play the CD's. It doesn't spin at all but without CD it spins and the laser moves.

And the left side of the tray get's pulled more in than the right side. That was present before I took it apart as well.

Any input on those two issues are more than welcome.

Thanks
Peter

Dillen
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Clean the contacts of the door switch and replace capacitors on the servo board.
Check also that the ribbon cables are fully inserted and locked correctly.
Parts here.

Martin

Peter8300
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Thanks Martin,

I will order the parts together with some other parts I need.

Any idea as to why the it won't spin and and play a CD whereas it will spin without a CD?
Before disassembly there was no problem, so I guess I must have f***** something up. I didn't  disassemble the CD mechanism only took off the CD tray for cleaning and put it back on.

Peter

Dillen
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Peter8300:

Any idea as to why the it won't spin and and play a CD whereas it will spin without a CD?

When a CD is inserted, it can see its reflection, but it cannot find focus because of bad filtering in the laser supply so will not be able to read the disc, so no reason to start the spindle (though some drive versions actually still rotates the disc).

When a CD is not inserted, apparently it cannot see it because there are no reflections.
It then rotates the spindle to see if a disc has in fact been inserted and it was merely a case of shining the laser at a spot with no reflection.

It's all down to the programming

Martin

Peter8300
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Makes sense. I will try to clean the laser and report back.

Peter

chartz
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chartz replied on Sat, May 1 2021 10:12 AM

As Martin says. 

Replace the servo board caps, by all means.

Also, don’t underestimate the main power supply on the big board: the main caps can be bad as to causing a lot of ripple on the DC supply.

I’ve even seen one shorted once.

PS: thanks Martin for deleting my posts.

Jacques

Peter8300
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Update, cleaned the laser with a Q-tip and isopropyl alcohol and now it spins and reads the dish. Still need to check if sounds come out of it, that comes later.

So now I need to work on the issue with the tray getting pulled a little to far in on the left side (motor side) And of course get the parts from Martin.

Peter8300
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So at this point the machine plays CD's and the tray works as it should. Smile

Now to the last issue. The tray is not sitting in the right position in relation to the front. It is purely cosmetic but there must be a way to adjust that unless something have been bent by someone else before me. There's the adjustment screw next to the drive wheel (or whatever it's called) which kinda fell apart when I opened up the machine. I can adjust the tray with it but not better than the images below. Also note that when pushing the tray a tiny bit in the front and left side it corrects and looks like it should. So any ideas on how to go about it?

 

 

 

manfy
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manfy replied on Wed, May 5 2021 1:47 PM

Peter8300:

... There's the adjustment screw next to the drive wheel (or whatever it's called) which kinda fell apart when I opened up the machine. ...

Crying Could you be a bit more specific? With "adjustment screw", do you mean that white eccentric plastic gear you're pointing at with the torx screw driver??
If so, I don't really see that in the service manual -- and the manual doesn't say anything whatsoever about any adjustment.
The part that comes closest in the explosion drawing is part #9016   p/n3010029   Stop Block Rubber !

So I would guess this gear is some sort of stopper/clamping mechanism for the tray slide and it must be activated by the metal slide that is mounted on the tray shaft. (maybe some sort of rack and pinion system that holds the tray closed?)
What do you mean by "it fell apart when you dismantled the tray?

I googled for some images and found this on the net: <CD tray open
If you blow the image up you see that there is a rubber coating on that protruding thinggy on the gear! Since this guy didn't complain about tray problems I'd assume that this is something you're missing on your unit. I guess that might be a place to start.

Besides that, I'd think that the horizontal play of the plastic tray is determined by the play in the 2 metal slides the tray is screwed on. Probably you can adjust that with the mounting position of the tray on the slides.

Let us know how it works out!

rgds

manfy

Peter8300
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manfy:

Crying Could you be a bit more specific? With "adjustment screw", do you mean that white eccentric plastic gear you're pointing at with the torx screw driver??
If so, I don't really see that in the service manual -- and the manual doesn't say anything whatsoever about any adjustment.
The part that comes closest in the explosion drawing is part #9016   p/n3010029   Stop Block Rubber !

So I would guess this gear is some sort of stopper/clamping mechanism for the tray slide and it must be activated by the metal slide that is mounted on the tray shaft. (maybe some sort of rack and pinion system that holds the tray closed?)
What do you mean by "it fell apart when you dismantled the tray?

I googled for some images and found this on the net: <CD tray open
If you blow the image up you see that there is a rubber coating on that protruding thinggy on the gear! Since this guy didn't complain about tray problems I'd assume that this is something you're missing on your unit. I guess that might be a place to start.

Besides that, I'd think that the horizontal play of the plastic tray is determined by the play in the 2 metal slides the tray is screwed on. Probably you can adjust that with the mounting position of the tray on the slides.

Let us know how it works out!

rgds

manfy

 

 

Yes it is the white plastic gear which I'm pointing at with the torx screw driver. It can be adjusted from the bottom (a 5mm white allen screw) It is described on page 5.2 in the service manual. See images below.

It is indeed the part #9016  p/n3010029   Stop Block Rubber and the part I'm missing is the reddish rubber part visible in the image you linked to, thanks for that :-) The rubber part crumbled completely when I touched it, you can see a bit of in my picture. By now I'm pretty confident that is the reason my tray is skewed. I have contacted B&O here in Denmark and they setup a case to see if they can find a part (highly unlikely) or maybe the specifications to see if it can be reproduced somehow. The guy I spoke to was very accommodating.

I have tried to find a way to adjust the tray on the metal slides but it doesn't seem possible unless you drill bigger holes in the tray!

It would be cool if B&O still have the specifications for the part but otherwise I will make a visit to the lokal plummer for a suitable rubber gasket :-)

Surely I'm not the only one this has happened to so if anybody here has experienced it and found a solution I would love to see it. When looking at pictures in for sale adds I have noticed the same issue with the tray being misaligned which probably is due to the same part deteriorating.

I'll keep you all updated.

Peter

 

 

manfy
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manfy replied on Wed, May 5 2021 2:51 PM

Yes - thumbs up Thanks! I missed that one in the description.

That  clears things up. The function of the rubber is now obvious. It is supposed to dampen the "bumping sound" when the tray hits it and at the same time the friction holds the tray in place.
I would just use a normal flat rubber band that you can find in stationary shops or everyday supermarkets. I just googled "flat rubber band" and checked the images -- they offer thousands of variants. Smile
Cut that to size, use Pattex (which is an excellent adhesive for rubber) and mount it the same way as in the picture I linked to. There it seems the ends are clamped to the gear with that retaining clip.
Alternatively, you can look at the lever on the slide that bumps into this stopper at rear end position. Maybe it's easier to mount that rubber coating on that part? It should have the very same effect!

---------------------------

PS: New thought: Based on the dimensions in the picture, assess the thickness of the rubber. Find a rubber or silicone hose that fits on the protrusion on that gear, cut off the right length and fit it. This saves all the hassle with adhesives and potential incompatibilities with the plastic material. Rubber or synthetic rubber hoses can be found quite easily in all sizes at well-stocked auto part suppliers...or the internet, of course.

Second alternative: liquid rubber! But that's messy and it's hard to say in advance whether the properties of the specific liquid rubber product are right for this purpose.

Peter8300
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Flat rubber band, that's a great suggestion Smile I'll get right to work (tomorrow) and report back ASAP.

Peter8300
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Allright as per Manfy's great suggestion I went through our kitchen drawer where all kinds of rubber bands are kept. I experimented with a few and came up with a band 1mm thick, 5mm wide and 30mm long. I glued the ends together as shown in the picture and installed it on the stop. I might experiment with making it so there's a loop going around the pin in order to hold it more securely in place. Why the plastic part have gears on half of it I really don't know. The stop is also used to adjust the tray so it is flush with the front of the machine and can be adjusted with a hex key from below.
Anyway see the pictures below and feel free to ask if you have questions.

Unfortunately it didn't solve the issue I have with the tray being skewed. Now I'm again leaning to someone having bent something somehow. Unless someone has an idea how to adjust or solve this I will probably expand one or more or the mounting holes in the tray and adjust it that way.

 

 

 

 

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