jezsaz,
RCHK usually indicates that two speaker wires are touching, and this keeps the amp from breaking. You might check all of your wires to make sure they're not touching.
--HDTech
We have recently bought a Samsung UE46B8000 TV and HT-TZ325 digital home cinema system plus the wireless receiver. A Samsung BDP1600 Bluray player and Samsung Skyplus are also connected. In the last few days we have started getting an error message displayed on the DVD player 'RCHK' at the same time as the sound cutting out. This is becoming a tad irrating for the family. We have looked up this error message but can't find any details in the literature. Can you help please.

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