Beocenter 9000 CD decoder

[tonebells]

I am working on a Beocenter 9000 that has this CD decoder board.

The Philips axial caps are shot. I cannot seem to find the the parts info in the service manual for the B&O or the CD mec. One is a 1µf 63volt. It is marked 1µ0M. There is a 2.2µf  53volt marked 2µ2M. The other four I think are .47µf  or 4.7µ 25volt. They are marked 47µM. All the 47s test around 8µf and over 20Ω. If anyone knows for sure what they are please let me know.

Here is a closeup.

 

Any input is welcome.

 

 

 

 

 

 

 

 

 

 

 

µ

[Guy]

Welcome to Beoworld!

I am guessing a bit here, but it looks very similar to the BC9500 decoder board.  Have a look a the BC9500 service manual, which includes CD decoder circuit diagram and component list.

EDIT: BC9500 CD decoder was board discussed here – maybe swap notes!   https://forum.beoworld.org/forums/topic/beocenter-9500-cd-decoder-board-repair/

[Dillen]

The one with the lifted pin in the last photo is a 47uF 25V.
How do you test them, and with what?

Martin

[tonebells]

Guy wrote:

Welcome to Beoworld! I am guessing a bit here, but it looks very similar to the BC9500 decoder board. Have a look a the BC9500 service manual, which includes CD decoder circuit diagram and component list. EDIT: BC9500 CD decoder was board discussed here – maybe swap notes! https://forum.beoworld.org/forums/topic/beocenter-9500-cd-decoder-board-repair/

I will take a look this evening. Thanks for the info.

[tonebells]

Dillen wrote:

The one with the lifted pin in the last photo is a 47uF 25V. How do you test them, and with what? Martin

Peak ESR70. I will replace and see what happens. Thank You.

[Dillen]

What are the symptoms?

Martin

[tonebells]

It had the C2103 capacitor on the servo board issue. Once I had that fixed I started checking other boards. I know from past B&O repairs that these Philips caps have issues. These all tested bad and the main power supply caps were all leaking.

 

Tony

 

[Dillen]

What did you fit as C2103 (brand/type)?

Martin

[tonebells]

I will need to look  and see what I put in there. I had to move the unit off the work station while I wait for the power supply caps to come in. It will be a few days.

 

Tony

[Dillen]

C2103 must be a blue axial Philips/BC. That’s the only type I have found to be guaranteed to work.
I suppose you would have known it, if you fitted this type, so I suggest you replace it again, this time with such one.

Martin

[tonebells]

I installed a 33µf radial cap of some kind. If it works should it continue to work? Is it likely  to become an issue? I have seen that the 138AML is recommended. 33UF is the closest I am coming up with.

 

Tony

[Dillen]

If the drive refuses to read the disc, the first thing to replace is C2103 (and the rest of the electrolytic capacitors on the servo board).
C2103 MUST be a blue axial Philips or BC. I know it sounds strange, but it is a fact that not just any capacitor from any brand will work in this position.
The capacitance is not that important, it could just as well be a 47uF, but fitting anything but a blue Philips/BC cannot be guaranteed to work.
It has certain filtering properties not found from other brands.
A convenient kit is available from Danish Sound Parts containing the right capacitor.

Martin

• This reply was modified 1 week, 5 days ago by Dillen.

[tonebells]

33UF

 

Is the cap I used. I will report if it becomes an issue.

 

Tony

[tonebells]

It seems the CD is good to go. I replaced the power supply caps. Are there other preventative items that should be looked at?

 

Tony

[Author]

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