General Forum

Re: Beomaster 6500 blowing fuses

Dillen — Sat, 13 Mar 2010 02:27:49 GMT

Hard to diagnose any further per remote, I'm afraid.
I suggest you bring it in for service.

Martin

Re: Beomaster 6500 blowing fuses

beta75 — Fri, 12 Mar 2010 14:35:58 GMT

Any ideas?

/KN

Re: Beomaster 6500 blowing fuses

beta75 — Sun, 07 Mar 2010 12:19:46 GMT

The reading across D2 ~~ is 40k and slowly climbing the D3 across ~~ is 180K and climbing.

/Karl Nilsson

Re: Beomaster 6500 blowing fuses

Dillen — Sun, 07 Mar 2010 11:56:22 GMT

The reading across the capacitor sounds right.
A similar reading across the rectifier (across the ~ pins) could be interesting
but first unplug the connector from the transformer to the main board or you will measure into that too.

Martin

Re: Beomaster 6500 blowing fuses

beta75 — Sun, 07 Mar 2010 10:09:01 GMT

I finaly got some time to test this, when i put the ohmmeter cross the center and outer pin on the cap i get a reading that is climbing. like its charging. Is this right or what result am i looking for. I also checked the diod bridge and when i put the ohmmeter in diod setting är put it across the pins i get a signal att only two of them.

– ~ ~ +

the last two ( ~ + ) givs me a signal when i check them with ohmmeters + & – poles in both ways. Some other combinations gives siganl for a short while and then the ohmmeter shows resistans.

Any ideas?

Sorry for my bad english.

Re: Beomaster 6500 blowing fuses

Dillen — Wed, 03 Mar 2010 17:27:43 GMT

Yes, that's the one.
You cannot easily isolate the capacitor without isolating the whole power supply circuit.
Unscrew the bottom plate from the Beomaster and put an ohmmeter
across the capacitor (center pin to any of the three outer pins).
If you don't feel able to perform the repair, better leave it alone and let someone with
better knowledge do it. For the safety of both you and your Beomaster.

Martin

Re: Beomaster 6500 blowing fuses

beta75 — Wed, 03 Mar 2010 16:13:11 GMT

Thank you. Nice to be here.

Is there any way to check this without taking averything apart? I was thinking something like isolating the power supply an se if the fuse still blows and there by narrowing it down.

The cap U are taking about is it the one on this pic: http://grab.by/2OlJ

/Karl Nilsson

Re: Beomaster 6500 blowing fuses

Dillen — Wed, 03 Mar 2010 15:48:09 GMT

Welcome to Beoworld !

There can be many reasons but one I've seen a couple of times is the large
(4-pin radial) capacitor right at the corner of the board, just where the mains power cord
comes in.
If this is shorted you should also check (or simply replace) the large rectifier.

Martin

Beomaster 6500 blowing fuses

beta75 — Wed, 03 Mar 2010 15:18:40 GMT

I have a Beomaster 6500 with a short circuit. Need some help to find where the problem is.

The symptoms are: When i plug in the power cord the fuse T4A that sits between the transformator and the diod bridge blows. It sounds like its when the relay switches on.

The BM worked a few weeks ago and have been on the road in a car for some cold days. It's been sitting in a warm room for 24 h with the hood of in case there was condens or something.

Anyone have a idea where to start looking? Cant see any burned components...

Thanks för any help in any direction.

/Karl Nilsson