Denon AVR-S740H Service Manual

Checking operation between the HDMI (Front HDMI Buffer) and the player
b
In order to check, connect the player to the HDMI terminal and congure the player as AVR source.
Check the sound output while turning on the player.
Check item(44). Check the power supply voltage. :
Does the power supply voltage of the Front HDMI FFC base [CN710] indicate the correct voltage "5V"?
The test points are as follows.
CN710
+5V
Check item(46). Checking the 5V status of the register :
Send the following command from Termite.exe.
Send the command "i 002E 00FF 0001".
Move to the branch destination according to the value returned.
Check the power supply voltage. (HDMI Buffer)
Checking the +5V/DDC status register (Front HDMI Buffer)
Check item(45). Check the power supply voltage. :
Check the FETSW and peripheral pattern. If there is no problem, remove the Front HDMI FFC
from the substrate and measure the voltage at the test point of check item (44).
Is the power supply voltage correct (5 V)?
Front HDMI Buffer [C811] is faulty.
Replace with a new device.
Example
i 002E 00FF 0001
"00"
(Detection of 5V is not OK.)
"00 or 04"
(Detection of DDC is not OK.)
"88 or 80"
(Detection of 5V is OK)
"22"
(Detection of DDC is OK)
Go to check item (48)
Go to check item (49)
Go to check item (50)
Replace the FET SW[Q7413] and recheck from
check item (40). If it does not work, replace the
PCB.
Recheck from check item (2).
If it does not work, replace the PCB.
3-9. Front HDMI Buffer IC [AD8195] failure detection procedure
YES
YES
NO
NO
Check item(47). Checking the status of the register :
Send the following command from Termite.exe.
Send the command "i 002B 00B4 0001".
Move to the branch destination according to the value returned.
Example
i 002B 0084 0001
Before Servicing
This Unit
Electrical Mechanical Repair Information Updating
102

Denon AVR-S740H Specifications

General

Channels	7.2
Power Output per Channel	75 W (8 Ohms, 20 Hz - 20 kHz, 0.08% THD)
HDMI Inputs	6
HDMI Outputs	1
Dolby Atmos	Yes
DTS:X	Yes
Bluetooth	Yes
Wi-Fi	Yes
HEOS Multi-room	Yes
4K Ultra HD Pass-through	Yes
Power Output per Channel (6 Ohms)	110 W (6 Ohms, 1 kHz, 0.7% THD)
4K/Ultra HD Upscaling	Yes
Phono Input	Yes
Dolby Support	Dolby Atmos, Dolby TrueHD, Dolby Surround
Auto Calibration	Audyssey MultEQ
Input Sensitivity/Impedance	200 mV / 47 kOhms
Signal-to-Noise Ratio	98 dB (IHF-A weighted, Direct mode)
Ethernet	Yes
USB Port	Yes (front)
AM/FM Tuner	Yes
Supported Audio Formats	MP3, WMA, AAC, FLAC, ALAC, WAV, DSD
HDR Support	HDR10, HLG, Dolby Vision
Wireless Audio	AirPlay 2
DTS Support	DTS:X, DTS-HD Master Audio
Zone Audio	Zone 2
Frequency Response	10 Hz - 100 kHz (+1, -3 dB, Direct Mode)
Total Harmonic Distortion	0.08% (20 Hz - 20 kHz)
Built-in DAC	192 kHz / 24-bit