[Die_Bogener]

Around 10W is ok.

[Die_Bogener]

I would never turn anything around in B&O equipment… only when i exactly know what i’m doing.

Clean the drive, the axles, motor with alcohol… it’s 40 years old hard grease.

First clean it, then oil it. Remove the old stuff 100%…

Old grease and fresh oil: after 3 month you have a superglue. Nothing will move any more.

[Die_Bogener]

If D10 was damaged, replace everything what was/is in this line. LEDs, resistors, coils, TR10 and everything triggering TR10.

Something must have caused this overload… probably the already mentioned C19 2,2uF… a dead c19 will destroy all and everthing around Tr10.

And the fuse with 0,5A for 40V is much to late, when this job of destruction is done.

Check also IC6 CD4001 on the cpu. If the 455khz generator fails, it will also trigger TR10. IC6 of th cpu generates the IR signal. TEST IT!

[Die_Bogener]

Yes, that’s right, i use my own picture hoster.

Since it makes no sense for me to upload all and everything to the website, i use this hoster. The space is not enough.

I had uploaded all old stuff on the pre-pre-pre B&O Website… and all of it is gone.

[Die_Bogener]

B&O used pretty good stuff for the cabinets and for the loudspeakers. The speakers were usually very, very good sounding material… besides the surrounds. But they can be fixed.

The electronics was almost every time standard. B&O always used the standard aplication of the chip, used by Philips or intel or whatsoever, 100% according to the chip manufacturer.

This had a high amount of reliability. Longliving material, but only standard in the soundquality of the electronics.

But this has also good effects. Longliving, good repair possibilities, good supply of spare parts and … it can be upgraded very easy with better material.

Compare a LM833 to a BurrBrown UA2134… 0,00001% distortions and 50db better noise… that’s not a world, that are dimensions of light years…

Test a good B&O tweeter with an average bipolar electrolyth cap. Just average, just like all others… nothing really special…

Test the same tweeter with a polystyrene MKS-4 100V Foil from Wima. Really Good!

Test the same with a 100V Audyn 5% selected tin or silver plated cap. Woooooowwwww, GREAT!!! Test the effect with “Hotel California…” you will not think, this is the same music. You do not need any bass or loudness or any sound control, nothing but 100% original sound to hear a new world.

But: 50 Cent versus 15 Euro MKS… worth every Cent. Audyn is expensive material. One Penta is around 200€ material, just material, no work…

[Die_Bogener]

Caps in the sound path are usually small types. 1uF-10uf are used.

Good material for the sound path are WIMA MKS-2 types…

They are available in RM5 size, can substitute usually every electrolyth standard cap.

Available in 5%, 10% and 20% quality, some selected in non magnetic and 2% …

Usually in RED, they are a good replacement. Non magnetic and 2% are great… but you need a lot of material of 5% and a very good Cap tool to measure it. The magnetic types can be used for something elso in the power supply…

Low ESR in the sound path? Very bad idea…

[Die_Bogener]

Hallo,

dass der CD Player als solches läuft und funktioniert, ist die gute Nachricht. Denn das kommt eher mal seltener vor.

Die Platine hat eine eigene Stromversorgung für ihren analogen Sound. Sie generiert alles selbst. Prüfe, ob die beiden 8-poligen LM833 Operationsverstärker weiter symmetrisch versorgt werden… ich hab da was mit 2x16V in Erinnerung. Wenn da ein Weg ausfällt, ist der Ton weg…

[Die_Bogener]

When the cylinder head does not start, check the 12V line. It is quite normal, that there are caps making a short… and blow the safety resistor.

I have never seen a VX without cap problems. This would be the golden unicorn, 1 of a million… and i still have a dozen VX5000/5500/7000 still in use and have still around 50 in storage (had 340…), each year rebuilding some of them for very close friends.

If your VX is so good without cap problems, it was never turned on. But this will change very fast.

I have had some in brand new storage, never used, still in its transport box for over 20 years. None was leaking… 2 hours later after playing a tape it failed.

 

[Die_Bogener]

It is not normal.

There are 2 potentiometer on the amplifier section, adjusting the “no-load-current”.

Replace the pots (100 Ohms?) and look for this adjustment. 11mV across TP200-201 and TP400-401.

[Die_Bogener]

A BM5500/6500/7000 in standby, no amplifier running, no sound, no display, just the red dot: 20-25 Degrees Celsius… some degrees, maybe 5 degrees more than room temperature.

Anything else more means problems with transformer or voltage regulation…

 

[Die_Bogener]

The VX5000 will never activate the cylinder head in a bright room and missing the loading unit. The VX hates bright light on the tape deck. Bright light=broken Tape

There is a switch under the loading gear. And 3 IR LED detecting a loaded tape. 2 receiver and 1 sender in the middle.

Without a tape it will NEVER start. The VX will also detect a missing or defect tape when the wheels are stopped and not turning. He will detect a stopping tape problem.

Only unloading will work with the button.

Loading works only, if the IR LED right in the middle ist manipulated with black tape. Loading, not running.

Without a real tape you cant test the VX. I use defect tapes which were glued or cut or mechanical damaged…

 

[Die_Bogener]

The capstan has something like a tachometer funktion. Pushed by loading a tape will initiate a reaction of the motor, a wake up funktion.

There is a 4.th cap on the motor, hmmm… 3,3uf… that is the tacho. replace it.

 

[Die_Bogener]

There is a setup option “move”. Automatic and manual.

But this behaviour is not quite normal. Mine does not move when waking up.

Maybe the lithium Battery is going bad… BL7000 has a 6V Batterie AND a 3,3V lithium cell…

[Die_Bogener]

The cassette loading mechanism is ok? Not broken?

Loading/Unloding is working?

Usually the capstan motor does not turn forward/backward any more, just one direction breaking the loading unit.

Replace caps on the capstan.

If defect… and they are the first caps to fail… they cause an overload on the 12V line, causing an emergancy shut-off of the vx

If the smd chip becomes hot, you have found the problem.

[Die_Bogener]

OK, if the VX plays dead: replace the lithium Battery. 3,3V Mignon.

But no leaking? Very, very unusual…

When you have replaced it, we go to the capstan.

 

 

[Die_Bogener]

Ups. Does it still have a picture…?

The vx5000 has severe problems with the caps.

This is the quite normal minimum amount of caps to be replaced in a VX5000.

Do not power up the vx without having replaced each of them. The boards will be contaminated with acid beyond repair… and there are no survivors when acid is on the boards.

I have done lots of boards in the 90.ties, removing 100% of the caps and storing them without the caps.

Even brandnew stored, 1 time powered up is enough to make the caps loosing their acid. So DO NOT POWER UP  a VX without having done the job,

I have done a lot of them…

[Die_Bogener]

… and why dont’t you replace the battery? Or is the AC charging tool defect?

 

It’s a lithium battery. That’s no fun… it can burn or explode…

[Die_Bogener]

S45 speaker sound pretty good if technic is ok. Little bit oldfashioned, not very clear, but pretty ok.

The crossover is made with bipolar electrolyth caps. Even new, the sound is just ok, not more.

Replace them with this material: Audyn MKS foil caps. They last or a lifetime… and the sound is superior for tweeters and crossovers. Just a little bit expensive…

https://www.google.de/search?sxsrf=APwXEdfKhAIQpbUCQv3JuWa-7OZkPReTWg:1682927688386&q=audyn+mks+kondensator+hifi&tbm=isch&sa=X&ved=2ahUKEwi6yrGY0tP-AhXySfEDHTOxAKIQ0pQJegQIBRAB&biw=2752&bih=1011&dpr=1.25

 

[Die_Bogener]

A dying cap in the sound path will not react within a couple of seconds… dead is dead. Only some heat can change this fact for some time.

No, this behaviour is typical for the muting relay. Clean the contacts either with contact cleaner or very fine sanding paper or a special contact file.

You can test this fault with the second unmuted pair of loudspeaker plugs. If there is no problem, it’s the relais. If the problem consists also on the unmuted path, it’s a cap problem.

[Die_Bogener]

You need a Beolink 7000 “RDS”…

Has it “RDS”?

 

Not all BL7000 can handle RDS.

[Author]

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