Denon AVR-S740H Service Manual

Checking device. (HDMI Rx/Tx)
Check the power supply voltage. (HDMI Rx/Tx)
Check item(5). Check the power supply voltage. :
Does the power supply voltage of the HDMI Rx/Tx [IC721] indicate the correct voltage (1.1V, 3.3V)?
The test points are as follows.
IC721
112 pin
38 pin
1.1V
3.3V
Check item(6). Check the power supply voltage. :
Check the power components [IC741, IC744, Q7417] and the pat-
tern on the substrate.
If there is no problem, remove the HDMI Rx/Tx [IC721] from the
substrate and measure the voltage at the test point of check item (5).
Is the voltage correct (1.1V or 3.3V)?
Replace with a new device.
The power supply circuit is
faulty.
Replace the PCB.
Recheck from check item (1).
If it does not work, replace the PCB.
3-1. Error Code H1-01 failure detection procedure
NO
NOYES
Go to next page.
Checking the reset waveform. (HDMI Rx/Tx)
Check item(7). Checking the reset waveform :
Check the waveform.
When the power is turned on, is the TP [788_RST] waveform cor-
rect (as shown in the gure)?
IC721
788_RST
Check the reset circuit between
CPU [IC751] and HDMI Rx/Tx
[IC721].
If there is no problem, the HDMI
Rx/Tx [IC721] is faulty.
Replace with a new device.
Recheck from check item (1).
If it does not work, replace the
PCB.
NO
Examples of conrmation waveform
Voltage scale：1.0V/div
Time scale：20ms/div
YES
YES
Before Servicing
This Unit
Electrical Mechanical Repair Information Updating
86

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