Denon AVR-591 Service Manual

44
4.2. Power AMP (7CH AMP B'D)
No sound is output.
The protector operates.
Is the power transistor open or short circuit?
2SB1560/2SD2390
Is the emitter resistance of the power
transistor open?
0.47Ω
Is the base resistance of the power
transistor open?
22Ω
Is trimmer potentiometer between the base
of the power transistor open?
1kΩ
Is the zener diode and diode which are
connected with the base of a power
transistor short-circuited?
MTZJ3.3B
1SS133
Is other transistor trouble?
Is other resistance trouble?
Turn on power, check that voltage of the section is normal and that idling electric current is owing.
Replace the power transistor.
Replace the transistor.
Replace the resistance.
Replace the emitter resistance.
Replace the base resistance.
Replace the trimmer potentiometers.
Replace the Zener diode and the diode.
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
YES

Denon AVR-591 Specifications

General

Channels	5.1
Power Output	75 W per channel (8 ohms, 20 Hz - 20 kHz, 0.08% THD)
Frequency Response	10 Hz - 100 kHz (+1, -3 dB)
Input Sensitivity/Impedance	200 mV / 47 kohms
Signal-to-Noise Ratio	98 dB
HDMI Inputs	4
HDMI Outputs	1
Audyssey	Audyssey MultEQ
HDMI Pass-Through	Yes
Tuner Bands	AM/FM
Preset Station Qty	56
Total Harmonic Distortion	0.08%
Tuner Frequency Range	FM: 87.5 - 107.9 MHz, AM: 520 - 1710 kHz
Dolby Support	Dolby Digital, Dolby Digital Plus
DTS Support	DTS-HD Master Audio
Dimensions	434 x 167 x 382 mm
Weight	21.6 lbs (9.8 kg)