Beogram CD 5500

18 replies
A(
Offline
Audigy (archived2)
Bronze
Posted June 27, 2015 at 15:17 GMT
#2202497

Hi Everyone,

I'm a newbie to Beoworld but have been very into Bang and Olufsen since first seeing it in the local showroom window in the early 80s. I've accumulated quite a mix of equipment over the years, but a recent purchase has me stumped and I thought I'd ask the people who know for advice :)

I just took a chance of buying a Beogram CD5500 to upgrade from my CD50. When I bought it I was told it hadn't been used for 15 or so years, and it certainly looked like it! It has a few issues, and whilst I'm going to swap out the caps etc which should hopefully resurrect it I wanted to make sure it was worth doing as there are more faults than the usual CD read issue (which it also has).

Firstly the CD tray will not eject. The belt, mechanism etc seems OK - but the motor only seems to get 0.4v which is not enough to get it moving. Could this be a cap issue or something more serious? 

Secondly - the laser almost seems loose! The laser assembly moves very very freely and - I could almost blow on it to get it to move to its maximum extent. If you move it gently with the unit powered down it will move to and fro and take a few seconds to come to rest. When I manually insert a CD and try to play it it does move to the centre of the disc - but I'm still not convinced this is correct. I didn't want to start recapping if it has a dead laser mechanism. Does this sound right?

I'm hoping I can fix the above issues and add another fantastic CD player to my collection.

Thanks for your help :)

 

Mark

DI
Offline
Die_Bogener
Bronze
Posted June 28, 2015 at 18:16 GMT
#2202498

The "loose" movement of the laser unit is quite normal. This is OK.

0,4V for the motor means a defect, there is something wrong.

 

 

OR
Offline
orava
Bronze
Posted June 29, 2015 at 07:43 GMT
#2202499

check cabling and bad solderpoints from main board

F(
Offline
Friedmett (archived2)
Bronze
Posted June 29, 2015 at 11:49 GMT
#2202500

If it is anything built like the 6500 there is a switch in the middle of the unit which controls opening and closing of the cd deck. 

This can be faulty or just have to be bend slightly back in shape.

 

A(
Offline
Audigy (archived2)
Bronze
Posted June 29, 2015 at 22:21 GMT
#2202501

Hi,

Thanks you all for your advice. I've spent some time this evening looking at the CD player. I cannot see any broken joints, or loose components. I've also checked the tray switch and that seems OK too.

I've tested the circuit - and curiously it actually seems to work - but does not provide enough volts. When you hit the open button with the drawer closed one side of the motor goes to +0.4v and the other to -0.8v but the combined potential difference is not enough to turn the motor. If you extend the tray to its maximum extent then the polarity is reversed but the tray still does not move.

That being the case the logic seems to work ok - but there is some kind of power issue. Could it be faulty capacitors? There do not seem to be many related to the tray IC4 circuit.

NB - the IC4 pin 1 supply is +5v as you would expect.

Thanks

Mark

OR
Offline
orava
Bronze
Posted June 30, 2015 at 07:47 GMT
#2202502

Try no load, maybe with a resistor to emulate motor

A(
Offline
Audigy (archived2)
Bronze
Posted June 30, 2015 at 20:58 GMT
#2202503

Hi,

I've done further testing tonight and have found what looks like a power issue. There is not 12v at D5 or pin 4 of IC5. Tracing this back further there is not 15v at the emitter of TR1. Testing the caps with the system powered down it looks like C3 has shorted - which would presumably cause the drop of power.

Looks like I need to replace this cap - but an initial search seems to indicate that 470uf 40v caps are not easy to come by...

Thanks

Mark

S(
Offline
sonavor (archived2)
Bronze
Posted July 5, 2015 at 07:06 GMT
#2202504

Just use a 470uF, 50V capacitor instead. You can always go up in voltage value.  You just don't want to ever go lower on the voltage rating. 

-sonavor

A(
Offline
Audigy (archived2)
Bronze
Posted July 8, 2015 at 22:05 GMT
#2202505

Hi All,

 

Thanks for the advice. I did check the Zener diode and fortunately that was ok. I've now ordered the parts from Dillen who also advised replacing the four diodes in the rectifier. Hopefully this will get everything working. I'll keep you posted on the fix :)

 

Mark

A(
Offline
Audigy (archived2)
Bronze
Posted July 8, 2015 at 22:05 GMT
#2202506

Hi All,

 

Thanks for the advice. I did check the Zener diode and fortunately that was ok. I've now ordered the parts from Dillen who also advised replacing the four diodes in the rectifier. Hopefully this will get everything working. I'll keep you posted on the fix :)

 

Mark

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