Denon AVR-1911 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-1911 Specifications

General

Frequency range	10 - 100000 Hz
Audio output channels	7.1 channels
Audio A/D Converter (ADC)	24-bit/96kHz
Signal-to-Noise Ratio (SNR)	100 dB
Total Harmonic Distortion (THD)	0.8 %
HDMI	Yes
Audio system	Dolby TrueHD, Dolby Digital Plus, Dolby Digital EX, Dolby Pro Logic II, Dolby Pro Logic IIx, Dolby Pro Logic IIz, DTS-HD, DTS 96/24
Output power	125 W
Dimensions (WxDxH)	434 x 381 x 171 mm
Power requirements	AC 230, 50 Hz
HDMI ports quantity	5
AM band range	522 - 1611 kHz
FM band range	87.5 - 108 MHz
I/O ports	1 x Component in 1 x Composite Monitor out 1 x USB 1 x Microphone 1 x FM Tuner Antenna 1 x AM Tuner Antenna
Connectivity technology	Wired
Headphone outputs	7
Digital audio optical in	1
Product color	Black
Power consumption (standby)	0.1 W
Power consumption (typical)	460 W

Weight and Dimensions

Weight	10200 g