Denon AVR-X4400H Service Manual

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

Check the power supply voltage. (HDMI SW2)Check item(14). Check the power supply voltage. :Does the power supply voltage of the HDMI SW2 [IC381] indicate the correct voltage (1.1V)?The test points are as follows.HDMI SW2IC381112 pin1.1VCheck item(15). Check the power supply voltage. :Check the power components [IC120/IC113] and the pattern on thesubstrate.If there is no problem, remove the HDMI SW2 [IC381] from the sub-strate and measure the voltage at the test point of check item (14).Is the voltage correct (1.1V or 3.3V)?Replace with a new device.The power supply circuit isfaulty.Replace the PCB.Recheck from check item (1).If it does not work, replace the PCB.Checking device. [IC381 : MN864788]3-3. Error Code H1-03 failure detection procedureNOYESNOYESChecking the reset waveform. (HDMI SW2)Check item(16). Checking the reset waveform :Check the waveform.Is the "TP19" waveform of the TP near the HDMI SW2 [IC381]correct (like the one shown in the diagram) when the power isturned on?HDMI SW2IC381TP19Check the reset circuit betweenCPU [IC151] and HDMI SW2[IC381].If there is no problem, the HDMISW2 [IC381] is faulty.Replace with a new device.Recheck from check item (16).If it does not work, replace thePCB.NOExamples of confirmation waveformVoltage scale : 1.0V/divTime scale : 20ms/divcheck item (1) again after replacing [R3812/R3814] with a newresistor.If there is still a problem, the HDMI SW2 [IC381] is faulty.Replace with a new device.Recheck from check item (1).If it does not work, replace the PCB.YES110Caution inservicing Electrical Mechanical Repair Information Updating