Denon AVR-1312 Service Manual

41
4.2. Power AMP (MAIN UNIT)
No sound is output.
The protector operates.
Is the power transistor open or short-
circuited?
2SB1560/2SD2390
Is the emitter resistance of the power
transistor open?
0.47Ω
Is the base resistance of the power
transistor open?
4.7Ω
Is the trimmer potentiometer between the
base of the power transistor open?
1kΩ
Are 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 the 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-1312 Specifications

General

Number of Channels	5.1
HDMI Inputs	4
HDMI Outputs	1
Amplification Type	Discrete
Input Sensitivity	200 mV
Frequency Response	10 Hz - 100 kHz (+1, -3 dB)
Signal-To-Noise Ratio	98 dB
Digital Optical Inputs	2
Coaxial Digital Input	1
Analog Audio Inputs	4
Headphone Jack	Yes
Tuner Presets	56
Dimensions (W x H x D)	434 x 151 x 319 mm
Amplifier Type	Discrete
Tuner Type	AM/FM
Preset Stations	56
Remote Control	Yes
Dolby Technologies	Dolby Digital Plus, Dolby Pro Logic II, Dolby TrueHD
DTS Technologies	DTS-HD Master Audio
Output Power / Channel	75 W (8 Ohms, 20 Hz - 20 kHz, 2 channels driven, THD 0.08%)
Input Impedance	47 kOhms
Audio Inputs	2 Optical, 1 Coaxial, 4 Analog
Power Output	75W per channel (8 ohms, 20Hz-20kHz, 0.08% THD)