You should check out these repair ideas when you get the sony str-dh820 protection error.
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Fault receiver protection is designed by Sony solely to protect against short cycles or power surges. When the Sony receiver is in protection mode, external audio systems will not work properly and a thorough assessment of the functional issue may be necessary to remove the protection and avoid speaker damage.
1401Turn off your MP3 home device and disconnect all electrical speaker circuits from the rear panel. Then turn my device back on to see if the issue is resolved. If you find that the underlying problem still exists, turn off the device and let it run for at least 30 minutes before turning it back on. fourteen01
Worn out speaker wires and cables can cause your Sony Protector Gadget to malfunction.
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Sony Receiver In Mode
Why does my Sony receiver keep shutting off?
If your MP3 system shuts down, there may be a problem with our power supply at this point, or a possible connection to junk.
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