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The Marantz NR1607 is an AV Receiver, and the CY920 error code is not a recognized error code for this product. It's possible that this is a custom or specific error code for your device, and I would recommend contacting Marantz support or the manufacturer for more information. They may be able to provide you with a solution or more information on what the error code specifically means and how to resolve it.
The one that is heating up and shutting down could have a shorted output. Try removing all the speaker wires. If it still heats up and shuts down, it probably has a bad output stage.
On the one displaying the DSP ROM error, you may want to try a factory reset. using the following sequence:
Should the operation or display seem to be abnormal,
reset the unit with the following procedure.
The SR4600 is turned on, press and hold the
7.1CH INPUT and ATT buttons simultaneously for
3 seconds or more.
Error code POWV5 refers to a problem with the 5 Volt dc supply to the Digital/Audio PCB. If it's not a loose conection then the Main PCB is normaly the problem.
Before we get too far, have you tried unplugging the unit from the wall and then firing it up about 20 mins later. This will do a hard reset on the units processor. If the first thing to when a power surge locks up your electronics.
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