Denon AVR-S900W Service Manual

4.2. Power AMP (AMP PCB)
No audio output.
Protection is activated.
Is the power transistor open or short circuit-
ed?
2SB1560/2SD2390
Is the emitter resistor of the power transistor
open?
0.47Ω
Is the base resistor of the power transistor
open?
22Ω
Is the trimmer potentiometer between the
base of the power transistor open?
1kΩ
Are any other transistors faulty?
Are any other resistors faulty?
Turn on the power and check that the voltage of each part is correct and that there is an idling cur-
rent.
Replace the power transistor.
Replace the transistor.
Replace the resistor.
Replace the emitter resistor.
Replace the base resistor.
Replace the trimmer potentiometers.
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
YES
88

Denon AVR-S900W Specifications

General

Channels	7.2
HDMI Inputs	8
HDMI Outputs	2
Wi-Fi	Yes
Bluetooth	Yes
4K Ultra HD Pass-through	Yes
Dolby Atmos	Yes
DTS:X	No
HDMI Pass-Through	Yes
Input Impedance	47 kOhm
Input Sensitivity	200 mV
THD at rated output	0.08%
Signal-To-Noise Ratio	98 dB
DAC Resolution	24-bit / 192kHz
HDMI Switching	Yes
AirPlay	Yes
DLNA	Yes
Dimensions	17.1 x 6.6 x 13.3 inches
Power Output	90 W
Response Bandwidth	10Hz-100kHz
Output Impedance / Channel	6 Ohm
Inputs	HDMI
Outputs	HDMI
Supported Audio Formats	MP3, WMA, AAC, FLAC, WAV
Supported Video Formats	4K
Output Power / Channel	90W (8 ohms, 20Hz-20kHz, 0.08% THD)