Have you tried plugging your CX50s into the Speakers 2 outputs instead of Speakers 1?  Let us know if they work that way.

no output at all . so pcb 7 is not the cause ( i think ) both right and left is missing on every output        

Anything on the headphone out? Is the white dummy-plug present at the Beomaster's LINE IN/OUT connector (below the speaker 1 connectors)?

Yes , that plug is present . Strange thing it stopped suddenly without a plop , only silence on all 4 outputs . i noticed there is no "pop"sound when i switch on the master , so it looks the whole amplifier section is not working . Mute relay is working .   Is there a fuse  for the power-amp section ?    

Is the 8V present for the tonecontrol circuits? If not, check 3TR4 (BC547B) and all filter capacitors related to the supply voltages in the preamplifier. Martin

looks like the relay rl1 is acting a bit strange , only has an active break-contact , i don't know if that is supposed to be that way as the schematic indicates it should be closed active via tr19 . am i missing something here ??

As adviced bij Dillen , replacing the relay after 30 years is a good idea as the contacts have detoriated a lot ! this is clearly visible in the metal "coating" on the inside of the plastic housing . = the real problem however turned out to be TR19 , after replacing the bc337 the relay responded to the standby signal again ( as is was shorted to mass , the relay was active all the time ) .   Thanks Martin for assisting !!