What source are you using?(Directv/dish/comcast/uverse???) You might try a component/RCA straight to the TV. The only thing you lose is PPV 1080P(if you even have/use it).
You could easily find out. Turn on the Marantz, pick the input for cable/sat and turn the AVR back off. My onkyo 707 does it. The feature is called "HDMI passthrough in standby" (if the manual mentions it).