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Beogram CD50 Belt change

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Søren Mexico
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Søren Mexico Posted: Wed, Jul 25 2012 5:41 AM

To attach a new belt in the BG CD50 is not for non technical people, if you have 10 thumps, stay away and get a technician, here goes. Tools and accessories. Take of the top cover, 2 screws in the back, loosen push up, tighten again, pull the cover to the back some 5-10 Mm. and lift up.

Take of door arm, green arrow, 2 screws, one at the left red arrow, for the arm guide, one at the right red arrow, at the door (flap), wiggle out the arm, then unscrew the 2 screws for the black "hooks", middle red arrows, wiggle out hooks

Looks like this

For the laser unit, unscrew 4 scews, red arrows, and the cable guide, green arrow.

Pull the laser unit a little to the left, lift it free, carefully, and turn it over to the right, place a pair of rubber pieces or a insulating sheet, between unit and PCB

Mark the gears, red arrows, if not or bad marked, you are into some job to get right again. take off the cam follower, blue arrow, one philips screw, loosen one allen screw (1.3 Mm. allen key) and turn the brass nut CCW, green arrow, until it comes of, lift out gear/cam wheel, this is divided in two parts, see next pic.

Lower part of the cam gear, red arrow, make sure you align the small guide spline to the cam gear when mounting the upper cam gear. The gear with the blue arrow can stay there, but now is a good occasion to take it off, clean and lubricate it.

All out, upper right gear is fastened with an E/clip, use a small screwdriver, and twist, be careful, they tend to fly around, never to be found again.

Old belt left, and new belt from Dillen right.

New belt in, look out for twisted belt, red arrow, turn the belt wheel to check, and turn the belt if twisted

After cleaning and lubricating everything its time to get it all back in, when you put back the gear/cam, take care to adjust the brass nut correctly.

First fit it properly to the lower cam part, check the gear marks are in the right position, then screw on the brass nut CW until finger tight against the gear, then turn it CCW 1/2 a turn, if the nut is too tight the gear will not move freely, if to loose the disk lift will not go high enough.

Attach everything as it was before, turn the gears by hand and turn the disk tray to end positions, in and out, a couple of times, check that all wires are correct located and doesn't touch anything moving, leave the disc tray in the in position, connect to mains, press open tray, insert CD, press play, if it works OK you should see the counter moving, and the laser unit moving and focusing, press next track, until last track, and check the wires, that moves with the laser unit, can move without problems, move from first to last track and back a few times to get all the new grease and oil worked in.

Count your tools, and look if the only thing left is the old belt, put on the cover, connect your player and enjoy.

My BG CD50 worked without failures. So I wont do more, why repair anything that works perfectly.

 

Collecting Vintage B&O is not a hobby, its a lifestyle.

Leslie
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Leslie replied on Wed, Jul 25 2012 8:17 AM

Oh man, do I love this kind of picturized workinstructions, my compliments Soren!

Brengen & Ophalen

chartz
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chartz replied on Wed, Jul 25 2012 10:33 AM

Søren, I don't have the two front anchors at all, no trace that they ever were there either. I didn't have to remove the long arm either. Just the four screws and the cable bracket.

For the brass nut, my screw is definitely not 1.3 mm, but 0.9 mm (same as the one on the turntable).

What's the thingy pointing up in picture 2 anyway? I don't have that either!

I can skip pictures 2 and 3... Laughing

There seems to be many versions of this thing. Mine bears serial number 34820068.

Jacques

Dillen
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Dillen replied on Wed, Jul 25 2012 11:39 AM

The pointy thingy is a grounding spring, it contacts the metal at the underside of the top cover.
Some repairshops don't fit the anchors back after servicing. They are doing a good job protecting
the CD drive in rough transport.

Nice thread, Søren.

Martin

chartz
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chartz replied on Wed, Jul 25 2012 12:09 PM

Dillen:

The pointy thingy is a grounding spring, it contacts the metal at the underside of the top cover.
Some repairshops don't fit the anchors back after servicing. They are doing a good job protecting
the CD drive in rough transport.

Nice thread, Søren.

Martin

Yes of course, nice thread! Embarrassed

My cover is just plastic, no metal inside! Uh?Confused

 

 

Jacques

Søren Mexico
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I checked the PCBs again, but its just to small for me in there, so I just put it all together again, made the mechanical adjustments, connected, it played without failures the first CD. I may go in again when I feel brave.

Collecting Vintage B&O is not a hobby, its a lifestyle.

chartz
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chartz replied on Fri, Jul 27 2012 1:41 PM

Okay! Cheers Søren.

Jacques

Kasse
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Kasse replied on Wed, Mar 6 2019 10:18 AM

I really like instructions like these! I´m about to attack the same task myself; is there any chance to get the photos back online?

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Søren Mexico
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Pics back, have fun

Collecting Vintage B&O is not a hobby, its a lifestyle.

Kasse
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Kasse replied on Mon, Mar 11 2019 12:43 PM

Thanks a lot, Søren ;)

BeoPlay A9 Mk. II "Special Edition" - "Smoked Oak" 

Beosound Stage "Contrast Collection" - Anthracite

Beoplay M5 - Black

Beomaster 7000 + Beocord 7000 + Beogram 7000 MMC1/2 + Beogram CD7000 + Beolink 7000 + Beolab 8000

Beocenter 9500 + Beolink 1000

AUX Expander "Custom Mod" (built-in Bluetooth streaming)

Kasse
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Kasse replied on Wed, Mar 13 2019 9:24 PM

Maybe it eas beginners luck, but I managed to change the belt, clean and lubricate everything inclusing the motor - and everything works!

Also managed to clean the Beocord and change the belts, so that’s also working again. 

Now I just have to check the DIN-plug for the Beogram, as it has a loose connection - then everything is good as new. Well, almost. Thanks for your detalied description :)

BeoPlay A9 Mk. II "Special Edition" - "Smoked Oak" 

Beosound Stage "Contrast Collection" - Anthracite

Beoplay M5 - Black

Beomaster 7000 + Beocord 7000 + Beogram 7000 MMC1/2 + Beogram CD7000 + Beolink 7000 + Beolab 8000

Beocenter 9500 + Beolink 1000

AUX Expander "Custom Mod" (built-in Bluetooth streaming)

chartz
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chartz replied on Thu, Mar 14 2019 7:20 AM

Hi everyone, Søren et al!

Well done, well done!

My own CD50 I did 7 years ago (how time flies!) still works perfectly, and sounds as good as any other player. 

Jacques

Alex
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Alex replied on Mon, Mar 2 2020 8:16 PM

Thank you very much Soren, now i got a working CD 50 for my BM 5000. 

Søren Mexico
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Took some time, but you got here, congratz

Collecting Vintage B&O is not a hobby, its a lifestyle.

Jeff_baird
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Jeff_baird replied on Wed, Jul 22 2020 10:50 AM

8 years after your posting it is still helping out - I have just followed your instructions to change the belt to fix random door and non playing issues. The old belt had stretched and was slipping. I'm now the happy owner of a perfectly working CD 50 again - thank you sir. Oh and to think I was about to sell it on eBay for for parts. 

Søren Mexico
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Nice to see that an old thread is still helping out. With all the music found on line people tend to get lazy and forget about CDs, tapes and vinyl, I must admit that I also got lazy and didnt use my CD50 for about a year now, still playing my vinyl though. Thanks for posting Jeff and good luck with the CD50

Collecting Vintage B&O is not a hobby, its a lifestyle.

Jeff_baird
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It is nice to make the effort to listen to older formats, I have also got a beocord 5000 working again (another belt change) and I was surprised how well tapes sound on this unit. Enjoy 😊 

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