Denon AVR-X3300W Service Manual page 76

4.2. Power AMP (AMP PCB)
No audio output.
Protection is activated.
YES
Is the power transistor open or short circuited?
2SB1647 / 2SD2560
NO
Is the emitter resistor of the power transistor
open?
0.47 Ω
NO
Is the base resistor of the power transistor open?
22 Ω
NO
Is the trimmer potentiometer between the base
of the power transistor open?
1 k Ω
NO
Are any other transistors faulty?
NO
Are any other resistors faulty?
NO
Turn on the power and, check that the voltage of each part is correct and that there is an idling cur-
rent.
YES
Replace the power transistor.
YES
Replace the emitter resistor.
YES
Replace the base resistor.
YES
Replace the trimmer potentiometers.
YES
Replace the transistor.
YES
Replace the resistor.
4.3. Analog audio
No audio output.
Is a voltage of ± 8 V supplied to INPUT PCB
CN4201?
YES
Is there an audio signal in INPUT PCB CN4200?
NO
Is the connector correctly connected to the
HDMI PCB?
YES
Reconnect the connectors correctly.
If the malfunctioning channel and function can be identified, check the corresponding signal path.
76
NO
Repair the ± 8 V power supply.
YES
Repair the power amplifier.
NO
Connect the connectors correctly.
YES
Repair the HDMI PCB.