[Madskp]

yes that is the same PCB I have in the Ouverture

[Madskp]

Tignum wrote:

No flux capacitor! It does have an LED thoughI really cannot tell what the (tiny!) electronics do. If I did not capture a detail that is of use, let me know, and I can try to make a close-up with a camera.

Thanks for the look inside. At least it’s not just an empty box with some wirering from USB to RJ45 😉 but I can be discussed if the components inside reflects the price these boxes are sold at used.

I tried to google the 5 pin IC and it looks like it’s some kind of power regulator

https://www.indiamart.com/proddetail/pfki-24844731397.html

The small 3 legged transistor looking components seems to be some kind of diode

https://www.indiamart.com/proddetail/a7-smd-diode-19562740788.html

[Madskp]

I have also checked the battery to see if there should be any leakage.

It looks fine for now, and I meassure a voltage of 2,93V, so not high priority before the othe issue is solved

[Madskp]

Getting back to my Ouverture project I have now per Guy’s suggestion in another thread tried to play a CD which use the full 74 minute playtime. I have played it several times, and the Ouverture can play the whole CD without problems.

The problem that I have to press CD twice to get the CD spinning remains however.

I have tried to reflow alle the new capacitors just in case one of them had a bad connection, but that did not make any difference.

The updated part of the servicemanual for the CDM laser available at Beoworld has this passage which might very well be what I am experiencing:

However section 5 is not in the update for the servicemanual, and the procedure described in the older servicemanual is for a PCB with two trimmer potentiometers which is not on the PCB in my Ouverture

So I wonder if a newer version of section 5 in the servicemanual is available?

Also I would have to get hold of the described test CD to do these adjustments

[Madskp]

When you use a computer, phone etc. As an input it is a good idea to set the volume to max. On that device in order to get the strongest line level input signal.
This could be the issue in your case and explain why you have to turn the volume up on the MCL2AV up.

hope that helps

[Madskp]

Hi. I did not receive a PM

[Madskp]

Great to hear that you got it all working again 🙂

Even though it’s old the MCL2AV is a brilliant and versatile box in my opinion

[Madskp]

Rob wrote:

Good afternoon, I am trying to play music from my iPhone using my old Beolab 3500 speakers. I purchased a device from Bluetooth Solutions to interphase with my phone. I connected as instructed but the speaker remains dormant. I have tried Red-list, then go to Lopt and press 2 and 6 as those settings have been recommended in this website. Speaker does not respond. I was wondering if you can help me. I am attaching a picture. Thanks.

Hello. I don’t know this bluetooth Solutions product, but can you tell how it is connected to the Beolab 3500? Is it a DIN connector?

If so the MK1 and MK2 versions of the BL3500 has different pin assignments in the connector, so could be a cable issue. Please see one of the first pists in this thread to tell if you havd a MK1 or MK2 BL3500.

Next thing I wonder is if this product is supposed to activate the BL3500? Based on my findings in this thread I would not think so, but interesting if it does.

If it does not have this feature, and the connection is via the DIN connector the only way to activate the BL3500 is to use this key sequence on a BEO4 remote:

For BL3500 MK1: Menu + 0+ 4 + GO

For BL3500 MK12: Menu + Menu + 0+ 4 + GO

Note than when the speaker is activated with this sequence any keypress on the remote control will make it go to stand by. So volume control is done on the bluetooth part of it.

Hope this gets you further. You are welcome to make follow up questions

 

 

 

[Madskp]

Ravsted wrote:

On a beo4 with joystick you can select ‘mode’. There are 3 modes. With your ‘mode’ setting pressing the ‘play’ button instead of the joystick should do the trick.

Yes of course. Thanks for reminding me. I Did not think that far when I was trying to use it, and had the other BEO4 near by.

 

[Madskp]

Tignum wrote:

Hi Madskp, thanks for that! I will see to find an ML power box and share photographs of its content, just out of curiosity! Regards, Johan

It could be very interesting to see whats inside it

[Madskp]

I have now tried to a 1611 converter to the setup, so both the BLC NL/ML, BLC 1611 and BL3500.

Now the BL3500 says ML OK

The voltage on the Pink wire power + is 10.9V

The voltage on the blue vire power – is -10.9V

The voltage on the Green wire data + is 0.25V

The voltage on the green/white wire data – is -0.25V

So it seems that the BLC NL/ML does not have enough power to pull the voltages to the correct levels when a piece of ML equipment is connected.

So it might be that the options are:

• The ML power box
• A BLC 1611
• B3OHACK3R’s solution
• or a real ML audiomaster

 

[Madskp]

A little update from at testing session today.

I tried to connect the BLC to a BL3500 MK1 with a ML cable, and also connected the network link to my network.

On the BL3500 when I press Menu, 0, 2, GO it says No ML, so not registering it.

The voltages are also different when connected:

The pink Power + is now +4,68V

The Blue power – is now – 4,68V

Data + and Data – both are reading +0.4V which mean that at least the Data – can not pull the voltage to the correct level (-0.25V).

Also when I disconnect again and measure the data voltages they are both positive, and arround 0,3V. They might also both have been positive when I measured yesterday, so it could be that the missing negative data voltage is what the power box does?

[Madskp]

An observation I did today was that my BL35000 MK1 would not react to the Menu + 0 + x + GO sequence from my Beo4 with joystick. I don’t know if the press on the Joystick sends a different command than GO on the older Beo4’s. But worth noting if a BL3500 do not react on a Beo4.

In my case I could just find a Beo4 with GO button and complete what I had to do

[Madskp]

Tignum wrote:

Could it be the BLC only fails to supply the POWER+

According to my measurements it does supply that.

What I noticed when I tried measuring again is that power + and – starts at a low voltage 3-5V when the BLC is booting, but then changes to the +10,8V and -10.8V when it is ready.

One thing I did not mention before is the blue/white wire for ML sense. That has no voltage, but should not be relevant to the BL2000. Also in the RJ45 ML cables it is connected to power+

If I can find the time in the weekend I will try to connect a BL3500 to see if I can make it do anything

[Madskp]

Just to see what the BLC supplies I took mine out and connected it to power and a ML cable with loose ends.

On the the data + and – lines I can meassure 0.2-0.3V and – 0.2-0.3V so I would say that might be 0.25V (when taking my shaking hands into account 😉 )

On the pink vire I measure 10.8V and on the blue wire -10.8 V

So the BLC seems to have all the voltages coming out of it.

Now I am really confused what the ML power box does?

 

[Madskp]

The service manual describes a testing procedure for when the door does not close, or only slides down. In that case it says that if 3.3V is measured on pin 2 in the connector P1 when the door is in the lower position, the PCB with the magnetic switch should be replaced.

I do measure 3.3V even when it is not in that position, so might be an indication that something is wrong.

However the 6V that should also be in that connector, which I would guess is a supply is not there, so maybe something else is also wrong. I tried to measure for the 6V 2 PCB’s down, but still nothing.

I might have to start replacing the magnetic switch, provided I can finde. a replacement, and see what happens then

[Madskp]

Just found this old thread about the ML Power box https://archivedforum2.beoworld.ouronlineserver.com/forums/p/16217/141383.aspx

There is especially on post that mention this:

Where the last part I have underlined with red might be a dealbreaker.

 

[Madskp]

One extra piece of advice. The double sided tape that holds the glass plates may not have the propper strenght anymore.

Therefor there is a risk of the glass plates falling of when the top lid is open

[Madskp]

Tignum wrote:

Hope someone else has been wondering about this also

I have been wondering about that powerbox indeed, and would very much like to know how much there is in it.

It migth be that it has to generate both the positive and the negative voltage to support the systems that need both.

However the Beolab 2000 among others only has connections for the positive voltage according to the specifications in the servicemanual for it:

And on the diagram

 

So it might be that by supplying the postive voltage to pin 12 is enough.

In some of my testing with the BL3500 this was not enough for stand alone operation, but in this case where you also has the ML data signals from the BLC it might be that could be enough.

Looking at one of the other diagrams for the BL2000 I can see that the positive voltage fromt the ML connector is used to activate a transistor that activates a conenction called ML CON, which I assume is a way to tell the BL2000 that it is connected to ML.

I don’t know if it is this simple, but If you have some pieces of ML cables that are cut on the middle you could probably try to make an adapter.

I can also try some testing with a BL3500 but might not be before next week I have the time for it

[Madskp]

Looking very good ?

I went the cheap way for my RL45’s and bought an extra set to get on replacement strap.
Ironic the used equipment are sometimes cheaper than the spare parts for it

[Author]

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