Unloved Beolink 7000 help needed!

Hello all,

I've just received a scratched and dented Beolink 7000 that I bought on eBay as not working and without battery pack (it sadly arrived in really shoddy packing and the plastic cover on the table top charger had fractured and snapped the screw mounts off!).

I also bought a NiCd replacement unit from BeoVIenna as from reading posts it seemed a good place to start was to pop a battery in it! (I've also got one of the lithium memory batteries on its way)

I've soldered the NiCd battery up and when I did so I saw the front panel/screen light up for a fraction of a second but then go dark. If I tap on the mirror plate it does the same thing.

I've placed the remote in the charger but nothing happens (apart from if I tap the mirror plate again).

The battery was reading 5.5V before I soldered it in and the charger is reading 0.08V across the left and middle contacts.

It's an ambitious (risky ) project as I'm not very experienced with electronics but if anyone can offer any help or advice it would be most welcome!

 

Thanks

The batteries must have 6V for Operation.

The charger (middle=Ground) around 9,4V with open Loop.

=> charger dead.

One of the outer contacts is "+" power, the other side is internally connected to a resistor to terminate the "Data" Signal. But the voltage on the outer Pins is identical.

 

@Die_Bogener

Thanks for your reply - very helpful and gives me a direction to go in.

I have two subsequent questions:

1. Is the charger beyond repair or could it be brought back into service again?

2. Is the symptom of the remote flicking on briefly an expected result of the battery being under 6V and the charger not charging?

Thanks

Dave

The repair of the charger is pretty simple, every TV electric shop should repair it. A simple transformer with a linear voltage Regulator. Probably a fuse, maybe the transformer itself... just test the Output of the transformer, there is a bigger electrolyth cap behind the rectifier. Just check voltage, then you will find the Problem.

The flickering is normal. The BL7000 Needs around 200-300mA current for startup. A 5,5V empty Batterie will not do it. 

@Die_Bogener

Many thanks! I now have hope that I'll get it working again.

Dave

Update:

OK - so replaced the 100mA 250V fuse and we have some success! I'm measuring ~7.5V across pin 1 and 2 and ~9.6V between pins 2 and 3.

The remote powered on as soon as I put it on the charger and seems to have charged up successfully over night. Everything seems to light up as it should, no dead pixels on the matrix display although perhaps the backlight looks like it could do with replacing. I'm just letting it sit now off charge to see how long it lasts!

However, as with all problems as soon as one is overcome more spring up in its place!

1. I'm now getting 'NO CONTACT' in the display (although the remote seems to operate the basic functions of the Beomaster 7000). As the receiver and remote have come from different places I've removed the component and re-added it so they can see each other but still no joy (but can't rule out the receiver itself).  I'm assuming that given it's age it's the usual two-way IR capacitors that are suspect? 

2. Secondly the panel doesn't move automatically when it's laid flat and I touch the mirror plate. If I go into the panel menu I can see it's set to 'AUTO' and if I press 'MOVE' it sits up/down as expected but just not automatically? Hmm. I haven't replaced the memory battery yet (on my to-do list) but read in a thread that this can be a cause?

If anyone can offer any advice it would be appreciated!

Also the previous owner lost the battery cover screw so need to find one somewhere -  if anyone can help me send me a PM!

 

 

I'm sure Die Bogener will reply again, but the no contact display when the basic functions still work are the tell-tale sign of the capacitors responsible for the two-way communication having bitten the dust.  There are threads showing how to replace them if you search for beolink 7000 capacitor replacement.

Yes, the "no contact" are 99% defect caps. Replace them and clean the board.

How does the BL7000 detect that it shall move? There are 2 small switches in the backside. Activate them by hand and it should move by programmed "Auto".

But there are 2 plastic bolts in the back necessary... and if someone does not know what they mean and has looked into the BL7000, they get lost.

@Die_Bogener

Thanks again for your reply! I suspected the caps so have ordered the components from Conrad (and also a backlight film as well).

I can now see the two switches for the panel movement and they work when I manually press them. However, the battery cover is missing the screw so it's held on using tape and this is not letting the switches touch the table...

I need to get hold of a replacement battery cover screw now!

It is a black bolt for plastic/wood,  diameter 3mm, length 6mm.

Linsenkopf Kreuzschlitz 2.9x3.5 ....

 

@Die_Bogener

Thanks ! I found a suitable screw in my box of leftover B&O screws and it pretty much works. It's a bit temperamental but we're getting there! When I replace the capacitors I'll have a fiddle and see if I can get it working any better.

Dave