Denon AVR-X4400H Service Manual

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

Check the power supply voltage. (HDMI Tx)Check item(6). Check the power supply voltage. :Does the power supply voltage of the HDMI Tx [IC431] indicate the correct voltage (1.1V, 3.3V)?The test points are as follows.HDMI TxIC431162 pinL43011.1V3.3VCheck item(7). Check the power supply voltage. :Check the power components [IC121/IC113] and the pattern on thesubstrate.If there is no problem, remove the HDMI Tx [IC431] from the sub-strate and measure the voltage at the test point of check item (6).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. [IC431 : MN864787]3-1. Error Code H1-01 failure detection procedureNOYESNOYESGo to next page.YESChecking the reset waveform. (HDMI Tx)Check item(8). Checking the reset waveform :Check the waveform.Is the "TP91" waveform of the TP near the HDMI Tx [IC431]correct (like the one shown in the diagram) when the power isturned on?HDMI TxIC431TP91 Check the reset circuit betweenCPU [IC151] and HDMI Tx [IC431].If there is no problem, the HDMITx [IC431] is faulty.Replace with a new device.Recheck from check item (1).If it does not work, replace thePCB.NOExamples of confirmation waveformVoltage scale : 1.0V/divTime scale : 20ms/div107Caution inservicing Electrical Mechanical Repair Information Updating