Denon AVR-X6400H Service Manual

4.2. Power AMP (AMP PCB)
No audio output.
Protection is activated.
Is the power transistor open or short circuited?
DHCT-A3 / DHCT-C3
Is the emitter resistor of the power transistor
open?
0.47 Ω
Is the base resistor of the power transistor open?
47 Ω
Is the trimmer potentiometer between the base
of the power transistor open?
300 Ω
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.
NO
NO
NO
NO
NO
NO
YES
Check the CPU.
4.3. Analog audio
No audio output.
Are the [N9028 : 5 - 7pins] in the A.AUDIO/VIDEO
PCB receiving ± 7V?
Does the audio signal ow to [N5833] on the L-
AMP CONNECT PCB and [N5821] on the R-AMP
CONNECT PCB?
Reconnect the connectors correctly.
If the malfunctioning channel and function can be identied, check the corresponding signal path.
Repair the ± 7V power supply.
Repair the power amplier.
Is the serial data for electronic volume sent to
the DIGITAL PCB?
YES
NO
YES
YES
YES
YES
YES
YES NO
YES
NO
YES
When using the protection pass mode, do not connect speakers to the speaker terminals.
90
Caution in
servicing
Electrical Mechanical Repair Information Updating

Denon AVR-X6400H Specifications

General

Receiver type	Surround
Frequency range	10 - 100000 Hz
Pre-out channels	11.2
Input sensitivity	200 mV
Pre-out connectivity	Yes
Audio output channels	11.2 channels
Signal-to-Noise Ratio (SNR)	100 dB
Power output per channel (1KHz@6 Ohm)	205 W
Power output per channel (20-20KHz@8 Ohm)	140 W
Display	-
HDCP version	2.2
Apple docking	No
Product color	Silver
Audio decoders	DTS:X, Dolby Atmos
Audio formats supported	ALAC, DSD, FLAC, WAV
RS-232 ports	1
Connectivity technology	Wireless
AM band range	522 - 1611 kHz
FM band range	87.5 - 108 MHz
Supported radio bands	AM, FM
Internet radio services supported	Deezer, Napster, Spotify, Tidal, TuneIn
HDMI in	8
Composite video in	4
Component video (YPbPr/YCbCr) in	2
AC input voltage	230 V
AC input frequency	50 Hz
Power consumption (standby)	0.5 W
Power consumption (typical)	750 W
Number of HDMI outputs	3

Weight and Dimensions

Depth	393 mm
Width	434 mm
Height	167 mm
Weight	14500 g