Denon RCD-N9 Service Manual page 30

(c) Speaker short protection
Potential difference across the terminal detects that the speaker was more than DC±3V.
(d) Over current
Over-current detection digital amplifier(TAS5142)
(e) DC protect1
Short of fail(+29V[D-AMP power])
(e) DC protect1
Short of fail(+12V, -12V, +5V).
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.
"No Protection" is displayed after the history is cleared.
After the reset is complete, the display "No Protection".
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