fizz wrote:

No clicking of a relay when inserting and removing the 3.5mm headphone jack.

Do you have a picture of the relay location?

I suggest that you check the circuit diagram before playing around with the relay.  The relay does not turn the PL outputs on/off.  As mentioned before, the contact breaker in the headphone socket could well be the culprit - it is directly connected to PL pin 4.

Thank you for that info. 

Since it was working one day then not the next (even without using headphones) would you still think it is the contact breaker in the socket?

fizz wrote:

Since it was working one day then not the next (even without using headphones) would you still think it is the contact breaker in the socket?

Not necessarily, but I would check it before looking at the relay.

By the way, do the Beolabs still each show a red standby light?

Yes, Beolabs are all showing red.

fizz wrote:

Yes, Beolabs are all showing red.

And have you tried MM's suggestions, swapping around cables etc?

Also have you tried passive speakers to the Spkr 1 and 2 sockets?

I don't have cables to test the passive ports. And I haven't tried powering off the Beolabs or swapping their locations.

fizz wrote:

And I haven't tried powering off the Beolabs or swapping their locations.

Then it would be worth trying this before anything else. Power down the Beomaster and all speakers, disconnect all speakers, and then reconnect a single speaker with a single PL cable.  Cycle through the speakers and cables (4 speakers, 4 cables, hence 16 permutations!) to see if you can eliminate a fault.  You could also try the speakers phono socket inputs (switch set to LINE) if you have a suitable source and cable.

Excellent advice.

I tested as you suggested and found that when one of my four Beolabs is connected then I get no sound at all. I haven't tested that unit with an RCA cable just yet.

Great news - sounds like you have a suspect speaker!  And when connected to the system, that speaker may well have prevented the others from activating.