The Workbench

Re: VX5000 worth repairing?

jvezina — Thu, 14 Feb 2008 22:58:38 GMT

Many thanks for this very interesting repair guide! I also have to fix my VX-5000 (North American) and I will use these repair instructions, particularly for the capstan motor. On the last picture, I recognize again the usual culprits: these horrible black Rubycon capacitors!

Regards,

Jean

Re: VX5000 worth repairing?

Die_Bogener — Thu, 14 Feb 2008 13:27:46 GMT

Hi,

the VX7000 has similar problems like the older VX5000/5500. The VX7000 has a power supply on the lower mainboard, there a 4 hot spots around the 4 power regulators... and dying caps.

The video signal matrix is on the cpu board right in the middle of the VX. That's a really hot area... and exactly there is also the biggest problem with the caps... more or less 100% of them are ready for replacement. Especially all the 1uf and 47uf types have got black feet

If the cpu board looks like this, repace all caps, 100%

If the VX has problems with sound or recording, on the upper mainboard are also some caps...

Martin

Re: VX5000 worth repairing?

Die_Bogener — Thu, 14 Feb 2008 13:15:40 GMT

No, that's not a good idea... the tuner is IEC bus controlled, if there is no communication with the tuner, the system may fail... i have never tried to use the VX without a tuner... hmmm, i will try it next time ;)

But probably nothing will happen, if you dont repair the tuner.

Re: VX5000 worth repairing?

Friedmett — Thu, 14 Feb 2008 13:13:14 GMT

I got a 2 way VX7000.

Its on a electric stand with a LX5500 and it works well together.

However a few weird things is shown on the VX and it depends if the tape is recordable or not + a certain timeframe.

Option 1: I use a non recordable tape like a movie it will play fine with maybe a few ajustments of the automatic tracking.

Option 2: Use a recordable tape for playback of video/sound will give after an hour some white noise going across the screen and then black/grey screen with sound. If I unload the tape it will play fine for a few minutes and doing it again.

The other day I rewinded a recordable tape on the fast speed which ruined the tape. Thats the only time I have experienced that.

Any ideas?

Re: VX5000 worth repairing?

tournedos — Thu, 14 Feb 2008 12:52:22 GMT

I finally got around to looking into this. I replaced four caps on the capstan board (including the tiny 3u3, I didn't remember that it wasn't on your replacement list) and now the machine works just fine (everything l that I can check without a B&O tv, that is) The solderings under the caps were really ugly, I had a hard time getting them to melt.

I suspect the tuner is toast also, but I don't think I'm going to touch it, since in two weeks, the analog transmissions disapper even from cable over here... unless it can fry something else when left unattended. Will the rest of the machine work if I just remove power from the tuner?

Re: VX5000 worth repairing?

Die_Bogener — Sun, 06 Jan 2008 17:06:16 GMT

The North American model is very similar to the European VX, almost no difference. The boards are almost the same, just the electronic parts are for NTSC system instead of PAL.

I know this tape loading defect, yes... i think that will/should be in the workshop, too.

Martin

Re: VX5000 worth repairing?

beoguy — Sun, 06 Jan 2008 16:47:45 GMT

Are the internals the same as North American models? Mine has been sitting in the basement for a couple of month because firstly, their is an unloading problem. The guide pin on the left (facing the front of unit) that moves forward to play a tape, and then back for ejecting the tape, seems to get caught on one of the other parts that are moving. Not very technical, I know.

The other trouble is the tuner section as mentioned above already.

Guy

Re: VX5000 worth repairing?

lausvi — Sun, 06 Jan 2008 13:47:01 GMT

It seems that the first part is already there! Looks good so far!

http://forum.beoworld.org/forums/thread/76448.aspx

Re: VX5000 worth repairing?

Die_Bogener — Sun, 06 Jan 2008 12:52:55 GMT

It's not very expensive, the material is around 30-50 Euro. But it's a lot of work to exchanche them all, i need around one day per VX.

The types are not very different, most of them are 3.3uf, 4.7uf, 10uf, 47uf and some bigger ones in the power supply. Nothing really special. What helps is, using miniature types an the mainboards. The reason for all these defects is heat, when you see how many parts are on the boards then you understand, there is no empty space on these boards.

Using miniature types of capacitors has some advantages: more air around these parts will keep them cooler ... and it is much easier to work with.

I writing now a small workshop about these VX5000, dismantling will be a part of it.

Re: VX5000 worth repairing?

tournedos — Sun, 06 Jan 2008 12:35:05 GMT

lausvi:
That would be great!

Seconded! I'll put mine on hold for the time being, I suppose the work will be much easier with advice on how to dismantle the machine.

Martin, do you have an approximation on how many different types of caps there are in that do-it-all replacement pile? Looks like a shopping list I wouldn't want to receive over the counter ;-)

-mika

Re: VX5000 worth repairing?

Die_Bogener — Sun, 06 Jan 2008 11:33:11 GMT

OK!

Re: VX5000 worth repairing?

lausvi — Sun, 06 Jan 2008 10:43:30 GMT

Die_Bogener:
Shall i make a workshop how to repair and improve this recorder?

That would be great! I suppose it would be very useful and it seems that many people still have these machines around and (like me) they would like to get it working. Picture-by-picture repair guide with instructions and tips would be really awesome!

Re: VX5000 worth repairing?

Die_Bogener — Sun, 06 Jan 2008 10:34:15 GMT

I think, in around 2 weeks, i will get some more VX recorders for repair.

Shall i make a workshop how to repair and improve this recorder?

Martin

Re: VX5000 worth repairing?

lausvi — Sun, 06 Jan 2008 10:20:44 GMT

Very interesting info in here! The pictures help a lot. I might even get so excited that I start working again with the two non-working VX5000's I have... :) Other one works that much that it plays (thrue headphone socket) but no picture, black screen with random white horizontal lines... Other has a cracked board with causes the tuner to forget the tunings... But it was also said to be running very hot!

(Previous thread about VX5000's -started by me some months ago: http://forum.beoworld.org/forums/thread/21980.aspx)

Re: VX5000 worth repairing?

Die_Bogener — Sun, 06 Jan 2008 05:42:42 GMT

Very nice is this defect, almost every VX with the shutdown symptom has killed this part: it's the 7812 12V regulator. It becomes soooo hot, that the connectors and the tin/copper of the board corrode... either it will shut down or the 12V are open to 18-22Volts and grills the chips....

Repace the 7812 and clean the board

http://img172.imageshack.us/img172/2161/p3050003atj0.jpg

Cleaned and ready for the new IC35

http://img172.imageshack.us/img172/6301/p3050001bfm1.jpg