Denon AVR-X4400H Service Manual

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

4.2. Power AMP (AMP PCB)No audio output.Protection is activated.Is the power transistor open or short circuited?2SB1560 / 2SD2390Is the emitter resistor of the power transistoropen?0.47 ΩIs the base resistor of the power transistor open?22 ΩIs the trimmer potentiometer between the base ofthe power transistor open?1 k ΩAre any other transistors faulty?Are any other resistors faulty?Turn on the power and, check that the voltage of each part is correct and that there is an idling current.Replace the power transistor.Replace the transistor.Replace the resistor.Replace the emitter resistor.Replace the base resistor.Replace the trimmer potentiometers.Connect the connectors correctly.Repair the DIGITAL PCB.4.3. Analog audioNo audio output.Is a voltage of ± 8V supplied to INPUT PCB[CN4006]?Is there an audio signal in INPUT PCB [CN401]?Reconnect the connectors correctly.If the malfunctioning channel and function can be identified, check the corresponding signal path.Repair the ± 8V power supply.Repair the power amplifier.Is the connector correctly connected to the DIGI-TAL PCB?When using the protection pass mode, do not connect speakers to the speaker terminals.YESNOYESYESNOYESYESYESYESYESYESYESNOYESNONONONONONO96Caution in servicingElectricalMechanicalRepair InformationUpdating