Denon AVR-3805 - Manual (Page 16)

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• This unit is equipped with a high-speed protection circuit. The purpose of this circuit is to protect the speakers under
circumstances such as when the output of the power amplifier is inadvertently short-circuited and a large current flows, when
the temperature surrounding the unit becomes unusually high, or when the unit is used at high output over a long period
which results in an extreme temperature rise.
When the protection circuit is activated, the speaker output is cut off and the power supply indicator LED flashes. Should
this occur, please follow these steps: be sure to switch off the power of this unit, check whether there are any faults with
the wiring of the speaker cables or input cables, and wait for the unit to cool down if it is very hot. Improve the ventilation
condition around the unit and switch the power back on.
If the protection circuit is activated again even though there are no problems with the wiring or the ventilation around the
unit, switch off the power and contact a DENON service center.
Protector circuit
• The protector circuit may be activated if the set is played for long periods of time at high volumes when speakers with an
impedance lower than the specified impedance (for example speakers with an impedance of lower than 4 Ω/ohms) are
connected. If the protector circuit is activated, the speaker output is cut off. Turn off the set’s power, wait for the set to cool
down, improve the ventilation around the set, then turn the power back on.
Note on speaker impedance