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Beosound 9000 (Mk1) shows PWR Error 20 in testmode

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69er
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69er posted on Tue, Mar 23 2021 7:44 PM

Hi guys,

there is a beautiful Beosound 9000 in front of me, which is faulty.

When I turn it on and press CD, it shows CD1 and then it powers off.

When i press after a few seconds Radio, it shows Radio 1 and then powers off

If i press another CD, it moves towards that CD slot, but then powers off and returns to the position 1.

Does not play neither Cds or radio. Haven´t tried Aux, but expect the same behaviour.

The glass door can be lowered and raised without any problems.

After running test mode 27 it shows two errors

 

ML Error 32(don´t think, this is the issue)

and 

PWR Error 20 (Guess here lies the dog burried)

 

I searched the forum and it seems, i am not the only one, who had this issue.

 

Could someone please help me here?

I can measure resistors, capacitors and transistors. Also exchange them.

As this seems a standard problem, could somebody guide me through this jungle?

 

With the very best regards

69er 

 

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69er
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69er replied on Thu, Mar 25 2021 2:00 PM

This post has 0 verified answers | 0 Replies | 1 Follower

Unsure

manfy
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manfy replied on Fri, Mar 26 2021 12:10 PM

69er:

I can measure resistors, capacitors and transistors. Also exchange them.

You really have the equipment for and reasonable experience in SMT repairs?? I just downloaded the BS9000 service manual and it seems that most of the boards are surface mount.

If you don't have the equipment and experience it would be a wiser (and probably cheaper!) choice to bring it to a professional repair shop. The unit is 20 years old and spare boards are probably hard to come by and expensive.
SMT boards can quickly be damaged beyond repair if handled improperly.

rgds

manfy

 

 

69er
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69er replied on Fri, Mar 26 2021 1:57 PM

Hi Manfy,

i know, it´s a little bit more tricky, but until today i always made it somehow work. Also SMT.

I just don´t want to spend time on investigations other people already did. Sharing knowledge helps :-)

 

Best regards

69er

 

manfy
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manfy replied on Sat, Mar 27 2021 9:47 AM

69er:

I just don´t want to spend time on investigations other people already did. Sharing knowledge helps :-)

Oh yes, indeed. And this seems to have become the preferred approach to electronics repair, especially in the younger internet-focussed generation...  Personally, however, I prefer a more pro-active approach and find it more expedient and beneficial at the end of the day.

Anyways, so just let's wait til somebody who's had the very same problem posts a solution.
Or if you get tired of waiting, you can just start with the traditional method:

- open the unit and start with a visual check. Burned components, blown fuses, deformed e-caps are a hallmark for problem areas.

- If no abnormalties are visible, the power supply is the first place to look. Electronics don't work without power and since the unit always goes back into standby shortly after powering it on, the main power supply should be at the top of your list. Measure the voltages, compare them to the voltage table in the block diagram found in the service manual and focus on irregularities and odd behaviour. Analyze and make sense of that behaviour with the help of the circuit diagrams.

With a bit of luck you'll have found and fixed the problem within an hour. Smile

Good luck,
manfy

69er
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69er replied on Mon, Mar 29 2021 9:39 PM

Hi manfy,

will do so.

But - just to mention it - the reason fro the existence of forums like this , is exactly, what i meant. 

Bring the whole group forward by not letting everybody do the same work.

Share knowledge.

In previous times maybe without internet, but the initial idea was the same ;-)

Best regards

69er

 

( i assume, i am older than you think)

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