Beomaster 3300 is not supposed to light up all the lights.
Only the selected functions, the current volume setting etc. is shown.

You tell us it has "no power" but also that some lights are on.
What exactly is not working ?

The schematics you found are for what ???  Beomaster 2200, 3000 and 3300 are all very different units.
If you need a service manual, make sure you get the right one.

Martin

Correction. The switch has 25 volt at both "legs" but does not switch.

Nothing seems to work only some light. None of the buttons respond. I have the one for 3300. I was told that the three units are almost the same, so i downloaded them all. I am currently using the one for the 3300 unit.

Difficult to diagnose at distance.

Do you have the -33V and +33V voltages on rectifier D23 ?
Any reaction to the remote - if you have it ?
Does the tuning discriminator react when you tune in on FM ?
Speakers attached to speaker sockets pair 1 ?
Do you have any sound at all from the speakers ? - A thump at power on or even just a faint click when changing source ?
Does the volume control indicator climb up and down when you try to adjust the volume ?

Martin

Good day, 

I know that this one here is quite old but I hope it is ok that I put my question here instead of opening a new topic. My problem is quite the same as it seems:

What I have: Beomaster 3300 Type 2951, bought as non-working off ebay, I have no history about the unit

What the machine should do: Satisfy my ears with great sounding music

What the machine really does: 

- I can turn it on and volume lights and source lights come up as they should do

- No sound coming out of the speakers or the headphone jack, no matter which source I'm selecting. Nothing to see on the scope when I stick it across the speaker terminal. Selector set for one pair of speakers of course. 

- Tuner seems not to react on anything (at least stereo light should come up when I dial through with antenna connected?)

- Fuses F2 and F3 keep blowing immediately after replacing with new ones (seems they are the ones for the amp section) 

I have measured the rectifier D23 on the big PCB and it measures fine. Also some other diodes tested but no shorts or open circuits noted on my meter. I wanted to replace the two big caps as they might still be the original ones. I don't see skidmarks on the board that could tell me that anything has exploded or cooked. Also smells ok. Cooling compound on the backside heatsink for the STK and TR39 and TR40 is completely dry, but that should be a minor problem to put some new compound there. Insulation plates for those two transistors also correctly positioned.

Can anyone point me the way to start off first? Any common parts known that I should check first? Have a schematic on hand and a soldering station and multimeters and so on. Already saved a Kenwood KR710 which had a water damage but the Beomaster is a way more complex unit than an old Kenwood xD

Thanks in advance for any useful reply. Don't want to let the unit die because this is a great piece of HiFi history ;-) 

It's quite common for the output amplifier i.c. to fail in these Beomaster's.

It's a single device with both channel amplifiers in the same package(IC100 as marked on the pcb).You can get to it's connections by removing the bottom plate of the unit.

You should have +33v at pin 11,and -33 at pin 9.If these voltages are present,you should hear some noises via the headphones when you touch pin 1,which is the right hand input to the ic.

If no noises as above,check safety resistor R123 (100ohm)

btw,speaker 2 output is controlled by a manual switch inside the pop up control compartment.

Replacement output amplifier ic's (STK4151-5)are readily available.

Speaker repair kit's are available for your speakers,but the RL140 are rather "big boy's" to use with the '3300!

Nick

And dont buy from Asia. it’ll be counterfeit.

Martin

Hello Nick and Martin, 

thanks for your replies. I just ordered a new STK from kessler-electronic.de which is a supplier for electronic parts here in Germany. They have some in stock and my hope is big that they are not selling this so called China-crap. Also this should be new old stock item, not a pulled module. Once it arrives I will install it and make a test run and also take a look at the voltages mentioned by Nick.

Will keep you posted about progress. Have a nice day guys ;-) 

New STK arrived just today and looks brand new! No old solder on the connections or any scratches on the surface. Hope my wife allows me to install it this Saturday. Can't wait to see if this really makes my unit play how it should do. Keep you guys updated in any case. Have a great evening!