Beomaster 3400 Problems

[donegal]

Hello,

I´m currently resurrecting my vintage B&Os, brought back to life two Beomaster 1900 and a Beocenter 7002. But now a Beomaster 3400 is challenging me. If i turn it on a humming sound is coming out of all 4 speakers, volume, tone and balance controls are working. But there are no lights turning up and no real sounds coming out of the speakers. I didn´t find the service manual for this model, has somebody got it or a source for it?

[traverso]

I lately discovered your message

Concerning the Service Manual I may send it  if you are still interested.

Cheers

Alain

[Mark-sf]

You should start by checking the power supply voltages and the electrolytic capacitors.

[donegal]

Yes, I‘m still interrested in the manual. I‘ve allready changed a lot of the capacitors, because some of them were obviously gone.

[Author]

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