Denon AVR-S730H Service Manual

Also see for AVR-S730H: Troubleshooting guide Owner's manual Owner's manual Quick start guide

Contents

Denon AVR-S730H Service Manual Manual pdf 70 page image

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?4.7 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.When using the protection pass mode, do not connect speakers to the speaker terminals.YESYESYESYESYESYESYESNONONONONONOCheck the CPU.4.3. Analog audioNo audio output.Is a voltage of ± 12V supplied to DIGITAL PCB[CN823]?Is there an audio signal in DIGITAL PCB [CN822]?Reconnect the connectors correctly.If the malfunctioning channel and function can be identified, check the corresponding signal path.Repair the ± 12V power supply.Repair the power amplifier.Is the serial data for electronic volume sent to the[IC821] of DIGITAL PCB?NOYESNOYESNOYES70Caution in servicingElectricalMechanicalRepair InformationUpdating