Denon AVR-X4400H Service Manual

Also see for AVR-X4400H: Manual Owner's manual

3-2. Protection History Display Mode3-2.1. ActionsThis mode enables the unit to record and display the event when the THERMAL, ASO or DC protection isactivated.If protections have been activated multiple times, the latest protection operation is recorded.3-2.2. Starting upWhile holding down buttons "ZONE3 SOURCE" and "STATUS" simultaneously, press the power buttonto turn on the power.Select the "2. PROTECTION" using the "CURSOR f/d" button, then press the "ENTER" button to con-firm.3-2.3. Protection information and displays· Press the "STATUS" button in Protection History Display Mode.· The protection history can be checked.(a) If no protections has occurred.L1 PROTECT HISTORYL2 :NO PROTECT(b) ASO (if the last protection is ASO)L2 :ASOCause A short circuit occurred between the speaker terminals, or speakers with an impedance outsidethe rating were connected.Note : Short circuits in speaker terminals or speakers can be identified.If the power is turned on in the abnormal state, protection is activated after around 6 seconds and thepower is turned off.(c) DC (if the last protection is DC)L2 :DCCause : DC output of the power amplifier is abnormal.If the power is turned on in the abnormal state, protection is activated after around 6 seconds and thepower is turned off.(e) Case of THERMAL (when the last protection incident is THERMAL(E) protection)L2 :THERMAL ECause : Abnormal heat sink temperature.If the power is turned on in the abnormal state, protection is activated after around 180 seconds and thepower is turned off.(e) Case of CURRENT (when the last protection incident is CURRENT protection)L2 :CURRENTCause : An over current flowed in power amp.If the power is turned on in the abnormal state, protection is activated after around 90 seconds and thepower is turned off.Caution : These protections may also be activated due to other factors such as disconnection of connec-tors or operations around the microcomputer.After viewing the above protection history, press the "STATUS" button to return to the normal display.155Caution inservicing Electrical Mechanical Repair Information Updating