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Protector circuit
• 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.
Note on speaker impedance
• 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.
Cooling fan
• The AVR-4800 is equipped with a cooling fan to prevent the temperature inside the set from rising. The fan is activated
under certain usage conditions. It is temperature and volume level sensitive, to minimize or prevent audible fan noise.
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