Denon AVR-S750H Service Manual

TMDS Signal
3.3V
TMDS
Example of waveform in check ① Example of waveform in check ②
Voltage scale：1.0V/div Voltage scale：1.0V/div
Time scale：20ms/div Time scale：1s/div
When the results of check item (3-9.2.) are "22"
(Detection of DDC is OK.)
Check item(3-9.5.). Checking register of the TMDS CLK detection status
register :
Send the following command from Termite.exe.
HDMI Rx/Tx
Send the command "i 002E 00FF 0001".
When the following value is returned, go to Yes.
HDMI IN1 "44" HDMI IN2 "22" HDMI IN3 "11"
When the following value is returned, go to No.
HDMI IN1 "00" HDMI IN2 "00" HDMI IN3 "00"
Check item(3-9.7.). Checking register of the TMDS CLK detection status
register :
Send the following command from Termite.exe.
Send the command "i 0006 00FF 0001".
When the following value is returned, go to Yes.
"CC or 44"
When the following value is returned, go to No.
"other"
Check item(3-9.6.). Checking the TMDS input waveform. :
Check the TMDS waveform at the following test point.
Is the waveform like the sample?
HDMI IN3
137/138/140/141/143/144/146/1
47pin
HDMI IN2
124/125/127/128/130/131/133/1
34pin
HDMI IN1
83/84/86/87/89/90/92/93pin
IC701
Checking the TMDS status register (HDMI SW)
Checking the TMDS status register (HDMI SW -> HDMI Rx/Tx)
Example
i 002E 00FF 0001
Example
i 0006 00FF 0001
Check for a short circuit in the pattern of the
TMDS line of the HDMI SW [IC701] from the HDMI
input terminal.
If there is no problem, the HDMI SW [IC701] is
faulty.
Replace with a new device.
HDMI SW [IC701] is faulty.
Replace with a new device.
Recheck from check item (3.2.).
If it does not work, replace the PCB.
YES
YES
YES NO
NO
NOYES
Check item(3-9.8.). Checking the TMDS input waveform. :
Check the TMDS waveform at the following test point.
Is the waveform like the sample?
55/56/58/59/61/62/64/65pin
IC721
TMDS Signal
3.3V
Example of waveform in check ①
Voltage scale：1.0V/div
Time scale：20ms/div
TMDS
Example of waveform in check ②
Voltage scale：1.0V/div
Time scale：1s/div
HDMI Rx/Tx [IC721] is faulty.
Replace with a new device.
HDMI SW [IC701] is faulty.
Replace with a new device.
Before Servicing
This Unit
Electrical Mechanical Repair Information Updating
104

Denon AVR-S750H Specifications

General

Receiver type	stereo
Frequency range	10 - 100000 Hz
Input sensitivity	200 mV
Audio output channels	7.2 channels
Signal-to-Noise Ratio (SNR)	98 dB
Total Harmonic Distortion (THD)	10 %
Power output per channel (1KHz@6 Ohm)	165 W
Power output per channel (20-20KHz@8 Ohm)	75 W
AirPlay	Yes
Display	VFL
HDCP version	2.3
Apple docking	No
Product color	Black
Audio decoders	DTS-HD Master Audio, Dolby TrueHD
Volume control	Rotary
HDMI in	6
Composite video in	2
Digital audio optical in	1
Package depth	432 mm
Package width	523 mm
Package height	229 mm
Package weight	10614 g
AC input voltage	120 V
AC input frequency	60 Hz
Power consumption (standby)	0.5 W
Power consumption (typical)	400 W
AM band range	520 - 1710 kHz
FM band range	87.5 - 107.9 MHz
Supported radio bands	AM, FM
Audio formats supported	AAC, ALAC, DSD, FLAC, MP3, WAV, WMA
Image formats supported	JPEG
Speakers connectivity type	RCA

Weight and Dimensions

Depth	330 mm
Height	152 mm
Weight	8618 g