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You should indicate you remote. In any case, if code is not in your remote you should follow indications for No code If you don't have a manual, look for one using google,and terms manual, make and model of your remote
There is a problem in either the power supply or amplifier output stages. The unit is programmed to shut down in such an event to protect other circuitry.
Using a schematic see if you can isolate the power going to the output stages. If unit stays on then the anomaly is in power amp stages. If it still shuts off problemo is in power supply - check diodes and capacitors.
The amp protection circuit has been activated. Remove the power cord from the wall outlet immediately. Disconnect all speaker cables and input sources, and leave the AV receiver with its power cord disconnected for 1 hour. After that, reconnect the power cord and reconnect an input and a pair of speaker wires onto the unit. If the receiver still does not turn on than you will have to bring it in for service. Turn up the volume and if the receiver doesn't shut down, power off the receiver and add another pair of speakers. Power up the unit again and turn up the volume. If it doesn't shut down, power off the unit again. Now connect all your input sources and turn on your receiver. If the unit shuts down again, your unit will need to be further serviced at an authorized Onkyo service center.
It sounds to me that some part of the circuit possibly an IC is overheating after several hours and develops a fault.
This will be a very tricky thing to track down. So maybe best to take it to an authorised service agent.
The magnetic cartridge preamp should work with the turntable, as presumably it will have a magnetic cartridge in it. The only reason that the amp states "magnetic" is that some very old turntables have ceramic cartridges which should not be connected to that terminal. Even if the turntable had a "ceramic" it could be replaced with a magnetic one!