[edo69]

Hello,

finally we had the possibility to test PCB32 components with the cooling spray.

the result was that the sound remains for more time cooling the LF33cdt.

So we will buy some and we will replace it in 2 weeks, ’cause the technician is going to holidays.

I will let you know…..

[edo69]

Hello, I begin to have some doubts regarding the possibility to repair the PCB32.

Right today, I have readen that the PCB 32 is a multi-layer board (4 layers); do you think that the issue could be in an internal conductive track?

In this case, we can not check nor repair internal tracks.

[edo69]

What happens is that, when I am cooling the C403 on PCB32 with compressed air, the souud comes back, but it lasts any seconds, then disappears again. What does it mean?

[edo69]

Hello

Thanks again for all your help.

The issue is increasingly complex.

As you already know, after replacing the Ic TDA1305T, the issue is still present.

These are today’s updates:

First of all, we were unable to find a can of spray cooler, so we did the test with a can of simple compressed air.

We ordered the spray cooler online, and it will arrive soon.

In the meanwhile, we noted that cooling the capacitor C403, the sound come out back; we replaced it, but nothing changed.

Then we replaced the capacitors C401 and C403, ’cause even cooling them, the sound come out back. But the problem persists.

We noted that wnhen the sound disappears, the TR405 output voltage starts to oscillate (from 3,08V to 3,22V, more or less), but we did not find what C403 got to do with TR405 .

So we are taking a pause due to the arriving cooler, that will allow us to make more accurate tests.

That’s all for the moment.

[edo69]

Hello,

today I have bad news and good news.

Bad news: after replacing the TDA1305T, the problem persists.

so you were right, being not convinced that the fault was in said Ic.

good news: the techician tried to cool down dhe PCB32 board after the BS9000 became mute, and the sound came back.

now we have to find out which one is the component that overwarming itself cause the problem.

do you have any suspect?

 

• This reply was modified 2 weeks, 3 days ago by edo69.

[edo69]

Hello,

the board with the two TDA1305T is jusr arrived.

The day after tomorrow we will replace it and I will let you know the result.

[edo69]

Hello,

unfortunately the DAC board I have found on http://www.audiophonic.fr is not the same mounted on Beosound 9000; It is only used to disassemble one of the two Ic TDA1305T and replace the original one with it.

[edo69]

Unfortunately noone of these suppliers you suggested have the TDA1305t in stock.

I also tried with 12 other sellers, such as: Mouser, Farrell, Tme, etc. and noone had avaliability.

So I decided to purchase an entire DAC board with n. 2 TDA1305T inside, on http://www.audiophonics.fr; I will keep you updated

[edo69]

Sorry, I missed to tell you about this test, that we already have done:

The result is that when the sound disappears, even the analog audio signal disappears at the output pins of the TDA1305T .

At this point, I think we have no more any doubt regarding the need to replace the TDA1305T to fix the problem.

As you already know, we already tried to replace the original DAC with other two, that I have purchased on Ebay, and, no obstain the Ic’s were guaranteed as “original” and “brand new”, noone of them, once mounted, werk properly.

Do you know any reseller of electronic components who could sell me a truly original and brand new Ic?

Thank you a lot for your precious cooperation

[edo69]

Goodevening,

today with the tachnician we check these line:

pin:
4. BCK -> Signal ok

5. WS -> Signal ok

6. Data -> Signal Ok

19. MSUB – > before and after audio stop remain on 5v

1. VDDA – > 5v, before n after

10. VDDD -> 5v, before n after

28. VDDO -> 5v before n after.

 

Technician reamin on idea that the issue is the DAC.

[edo69]

I think is always beautiful, even in this version.

[edo69]

Thank you a lot; I will send your post to the technician and I’ll update you on what will happen.

Kind regards.

[edo69]

Hello,

let me correct you:

the issue with the original Ic TDA1305T is that in 1-2 minutes the CD audio becomes mute, the CD keep spinning and the timer goes on while with other sources (radio, n. radio, n. music) there are no problems at all.

Individuated the Ic TDA1305T as the responsable of the issue by the technician, I providet to buy on Ebay n. 2 spare parts (original and brand new, they said).

When arrived, we replaced the original IC with a new one: we tested functioning, and after abour 30 sec. the cd signal became intermittent, then disappeared.

So we replaced the new Ic with the other new Ic; testing functioning, we had no sound at all.

Finally, we replaced the Ic with the original one, and everything came back the same as before (soun disappear in 1-2 minutes).

So we had 3 different responses by 3 different Ic’s.

What do you thingk about that?

• This reply was modified 1 month ago by edo69.

[edo69]

Hello, sure I know which version of Beosound 9000 I have; is a Mk3 (type n. 2571).

We are consulting the BS9000 MK3 service manual.

Thanks for your opinion, I’ll send it to the technician.

Any other suggestions will be appreciated.

Kind regards

 

 

[edo69]

I did the test 27 more times; at the first attempt, I have found various errors, then I realized they were errors of 10 years ago. So I erased them and started the test more times. Now it says that everything is fine (no errors at all) but the problem with CD remains the same.

If it was the output board to need reparation, is that one the service manual calls PCB41?

• This reply was modified 1 month, 4 weeks ago by edo69.

[edo69]

Hello, I got to put my BS9000 mk3 in test mode.

Test 27 did not gave me the answer I was looking for: just ml 8 error, that indicates an issue in masterlink circuit.

Everything OK with test 73, after laser replacement; he said “aps adjusted” , but the problem remains the same.

The strangest thing happened with test 71, that opened the lid, then closed it, and the sledge went to position 6, then to 5, 4 , 3 and 2.

Then turned OFF; no error or anything displayed.

I did it more time, always with the same result.

What does it mean?

 

Sorry, I didn’t read that to make test 71, the position 1 must be without the CD, while positions 2,3,4,5 and 6 must have the CD placed.

I repeated the test with position 1 empty, and it results OK.

• This reply was modified 2 months ago by edo69.
• This reply was modified 2 months ago by edo69.
• This reply was modified 1 month, 4 weeks ago by edo69.

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[edo69]

Does anybody have the electronic diagram of the main board of BEOSOUND 9000  Type no. 2571 (MK3)?

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[edo69]

It is sure: the output board is KO; does someone know where can I find a new one?

[edo69]

Hello. thank you a lot; I will run the test and I will post the result.

[edo69]

Thanks for your reply. I tried to connect the Beolab 3500 to another cable, and it works properly.

At this point, I do believe there was something wrong in the Master Link plug

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