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Det är troligen en skyddskrets som aktiveras, vet du att det inte är fel på nått inkopplat ?

Sid 188 i manualen.
Power turns off and the power
indicator flashes in red approx. every
2 seconds.
Due to the temperature rise within this unit, the protection circuit is working. Turn off the
power and wait about an hour until this unit sufficiently cools down. Then, turn on the power
again.
• Please re-install this unit in a place having good ventilation.

Eller

Power turns off and the power
indicator flashes in red approx. every
0.5 seconds.

Check the speaker connection. The protection circuit may have been activated because
speaker cable core wires came in contact with each other or a core wire was disconnected
from the connector and came in contact with the rear panel of this unit. After unplugging the
power cord, take corrective action such as firmly re-twisting the core wire or taking care of the
connector, and then reconnect the wire.
• Turn down the volume and turn on the power again.
• This unit’s amplifier circuit has failed. Turn off the power and please contact the Marantz
service adviser

Kan säga att även en sönderspelad högtalare ger detta fel.