Denon AVR-S740H Service Manual

Check item(19). Check the power supply voltage.
:
Does the power supply voltage of the DSP [IC781]
indicate the appropriate voltage (1.0V, 3.3V)?
The test points are as follows.
IC781
C7807 C7806
1.0V
3.3V
Check item(20). Check the power supply voltage.
:
Check the power supply components [IC741,
IC743, Q7415] on the substrate and peripheral
pattern.
If there is no problem, remove the DSP [IC781]
from the substrate and measure the voltage at
the test point of check item (19).
Is the voltage correct (1.0V or 3.3V)?
Check the power supply voltage.
Checking device. [IC781 : CS49844A]
Go to next page.
3-5. Error Code H1-08 failure detection procedure
NO
DSP [IC781] is faulty.
Replace with a new device.
Recheck from check item (1).
If it does not work, replace the PCB.
The power supply circuit is faulty.
Replace the PCB.
NOYES
YES
Check item(21). Checking the reset :
Check the CPU.
Is the waveform of the TP near the DSP [IC781] correct (like the one
shown in the diagram) when the power is turned on?
IC781
32 pin
Checking the reset waveform.
Recheck from check item (1).
If it does not work, replace the PCB.
Check the reset circuit between CPU [IC751] and DSP [IC781].
If there is no problem, the DSP [IC781] is faulty.
Replace with a new device.
NOYES
Examples of conrmation waveform
Voltage scale：1.0V/div
Time scale：20ms/div
Before Servicing
This Unit
Electrical Mechanical Repair Information Updating
92

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