Denon AVR-4810CI - Page 69

69
AVR-4810CI/AVR-4810
4. Power AMP
No sound is output
The protector operates.
YES
Is the power transistor open or short circuit?
YES
Replace the power transistor.
NO
Is the emitter resistance of the power
transistor open?
YES
Replace the emitter resistance.
NO
Is the base resistance of the power
transistor open?
YES
Replace the base resistance.
NO
Is trimmer potentiometer between the base
of the power transistor open?
YES
Replace the trimmer potentiometers.
NO
Is the zener diode and diode which are
connected with the base of a power
transistor short-circuited?
YES
Replace the Zener diode and the
diode.
NO
Is other transistor trouble?
YES
Replace the transistor.
NO
Is other resistance trouble?
YES
Replace the resistance.
NO
Turn on power, check that voltage of the section is normal and that idling electric current is
flowing.