It is not so easy to probe into to find a protection fault condition. The fault can be your output drivers- the MOSFETS/IC's fitted for both the channels, Use a meter after disconnecting to check for short in the drivers. Disconnect the positive and negative voltages to the output and see if the protect changes. Even a fault in the preamp stages that drives in high current into the output can shut the Amplifier. Sometimes this can be a noise like a HUM or HISS before the protect works. Faulty capacitors in these circuits also can cause similar issues and needs close observation.In this case I think that some capacitors are faulty as when the set is put on it charges on to make the amplifier work. Possible fault in the protect circuit or preamp.
You need to confirm and replace the specific stages or outputs. If not there can be issues in the mother board, maybe the protect circuit by itself is shutting off due to a faulty bias , maybe a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the protect is off then check for short on the speakers.
Marantz SR4500... | Answered on May 11, 2011
Marantz SR4500... | Answered on Oct 06, 2010
Marantz SR4500... | Answered on Jan 24, 2009
Marantz SR4500... | Answered on Nov 11, 2007
Marantz Audio... | Answered on Sep 09, 2018
Marantz Audio... | Answered on Aug 31, 2018
Marantz Audio... | Answered on Aug 26, 2018
Marantz Audio... | Answered on Aug 18, 2018
Marantz Audio... | Answered on Jul 15, 2018
16 questions posted
Usually answered in minutes!
Step 2: Please assign your manual to a product: