I have ordered the right fuse but meanwhile I thought I would check by putting in the fuse from the other speaker. It didn't work - so it's not a fuse issue after all. The next thing to check is the power supply I guess but I have approached the Meridian dealer for help. I live in Mumbai so that's not very easy. My old dealer Soundsmiths no longer deals in Merdian. So they directed me to a distributor, Audio One. I hope they have some expertise repairing Meridian gear.

Sources: Roon Nucleus, Oppo BDP-103, AppleTV, Processor: Meridian 808.3 , Speakers: DSP7200SE, Projector: SIM2 Lumis, Stewart 140" Custom Filmscreen