Denon AVR-S740H Service Manual

When the results of check item (29) are "00"
(Detection of 5V is not OK)
When the results of check item (30) are "00 or 04"
(Detection of DDC is not OK.)
Check item(31). Check the +5V voltage.
Does "+5V" at the following test point indicate 5 V? [JK731/JK741]
JK741
HDMI 5
[MEDIA PLAYER]
JK731
HDMI 4
[GAME]
+5V +5V
Check item(32). Check the DDC line :
Are waveforms of "DDCSCK" and "DDCSDA" observed at the test point near the HDMI input terminal?
JK741
HDMI 5
[MEDIA PLAYER]
JK731
HDMI 4
[GAME]
DDCSCK
DDCSDA
Check the +5V voltage. (HDMI Rx/TX) Check the DDC line. (HDMI Rx/Tx)
HDMI Rx/Tx [IC721] is faulty.
Replace with a new device.
Recheck from check item (2).
If it does not work, replace the PCB.
HDMI Rx/Tx [IC721] is faulty.
Replace with a new device.
Check for a short circuit in the 5 V line and the 5
V Switch IC [IC733].
If there is no problem, the HDMI Rx/Tx [IC721] or
the 5 V Switch IC [IC733] is faulty
Replace with a new device.
Check for a short circuit in the DDC line.
If there is no problem, the HDMI Rx/Tx [IC721] is
faulty.
Replace with a new device.
Recheck from check item (2).
If it does not work, replace the PCB.
YES NO
YES NO
less than 100KHz
5V
5V
This diagram shows an example of the DDC commu-
nication waveform.
-The high level voltage is 5V.
-The frequency of the DDC CLK is 100 KHz or less.
Check at each test point.
Voltage scale：2.0V/div
Time scale：40us/div
Before Servicing
This Unit
Electrical Mechanical Repair Information Updating
97

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