Denon RCD-N7 Service Manual page 30

Potential difference across the terminal detects that the speaker was more than DC9V
DC protect 1
Overvoltage of +B/-B
DC protect 2
Short of '+B/-B
Over current
Over-current detection digital amplifier
SubWoofer DC protect
Over voltage
Supply voltage is detected beyond the provisions
Protection history is reset.
When the Cursor u button is pressed for over 5 seconds while the protection history is displayed, the count value is
reset.
After the reset is complete, the display "No Protection".
Protection history is not cleared, even when the set is reset (Factory/User).
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