Denon CEOL Piccolo DRA-N5, Service Manual

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Speaker short protection
Potential difference across the terminal detects that the speaker was more than DC9V
DC protect 2
Short of '+B/-B (+12V_D, or +12V_A or -12V_A, or +29V fail)
Over current
Over-current detection digital amplifier
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).