Denon AVR-X4400H Service Manual

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

When the results of check item (61) are "NO"(Detection of 5V is not OK)When the results of check item (62) are "00 or 04"(Detection of DDC is not OK.)Check item(63). Check the +5V voltage.Does the test point near HDMI input terminal [JK381/JK382/JK383/JK384] indicate 5V?JK383HDMI 3[Blu-ray]JK384HDMI 4[GAME]JK381HDMI 1[CBL/SAT]JK382HDMI 2[DVD]5V5V5V5VCheck item(64). Check the DDC line :Are waveforms of "DDCSCK" and "DDCSDA" observed at the test point near the HDMI input terminal[JK381/JK382/JK383/JK384]?JK383HDMI 3[Blu-ray]JK384HDMI 4[GAME]JK381HDMI 1[CBL/SAT]JK382HDMI 2[DVD]DDCSCKDDCSDACheck the +5V voltage. (HDMI IN1 - 4) Check the DDC line. (HDMI IN1 - 4)HDMI Switcher2 [IC381] is faulty.Replace with a new device.Recheck from check item (3).If it does not work, replace the PCB.HDMI Switcher2 [IC381] is faulty.Replace with a new device.Check for a short circuit in the 5V line and the 5VSwitch IC [IC392].If there is no problem, the HDMI Switcher2 [IC381]or the 5 V Switch IC [IC392] is faultyReplace with a new device.Check for a short circuit in the DDC line.If there is no problem, the HDMI Switcher2 [IC381]is faulty.Replace with a new device.Recheck from check item (3).If it does not work, replace the PCB.YES NO YES NOless than 100KHz5V5VThis diagram shows an example of the DDC commu-nication waveform.-The high level voltage is 5V.-The frequency of the DDC CLK is 100kHz or less.Check at each test point.Voltage scale : 2.0V/divTime scale : 40us/div130Caution inservicing Electrical Mechanical Repair Information Updating