DOWNLOAD Sony STR-DG720 Service Manual ↓ Size: 4.19 MB | Pages: 92 in PDF or view online for FREE

Model
STR-DG720
Pages
92
Size
4.19 MB
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PDF
Document
Service Manual
Brand
Device
Audio
File
str-dg720.pdf
Date

Sony STR-DG720 Service Manual ▷ View online

SERVICE MANUAL
Published by Sony Techno Create Corporation
Sony Corporation
Audio&Video Business Group
SPECIFICATIONS
MULTI CHANNEL AV RECEIVER
9-887-994-02
2008I04-1
© 
2008.09
US Model
Canadian Model
AEP Model
Thai Model
Ver. 1.1  2008.09
STR-DG720
AUDIO POWER SPECIFICATIONS
POWER OUTPUT AND TOTAL HARMONIC DISTORTION:
(Models of area code US only)
With 8 ohm loads, both channels driven, from 20 – 20,000 Hz; rated 95 
watts per channel minimum RMS power, with no more than 0.09 % total 
harmonic distortion from 250 milliwatts to rated output.
Amplifi er section
Models of area code US, CND
 1)
Minimum RMS Output Power (8 ohms, 20 Hz – 20 kHz, THD 0.09%)
   
95 W + 95 W
Stereo Mode Output Power (8 ohms, 1 kHz, THD 1%)
   
105 W + 105 W
Surround Mode Output Power 
2)
 (8 ohms, 1 kHz, THD 10%)
  
140 
W/ch
Models of area code AEP 
1)
Minimum RMS Output Power (8 ohms, 20 Hz – 20 kHz, THD 0.09%)
   
85 W + 85 W
Stereo Mode Output Power (8 ohms, 1 kHz, THD 1%)
   
100 W + 100 W
Surround Mode Output Power 
2)
 (8 ohms, 1 kHz, THD 10%)
  
140 
W/ch
Models of area code TH
Minimum RMS Output Power (8 ohms, 20 Hz – 20 kHz, THD 0.09%)
   
70 W + 70 W
 1)
   
60 W + 60 W
 3)
Stereo Mode Output Power (8 ohms, 1 kHz, THD 1%)
   
80 W + 80 W
 1)
   
70 W + 70 W
 3)
Surround Mode Output Power 
2)
 (8 ohms, 1 kHz, THD 10%)
  
120 
W/ch
 1)
  
105 
W/ch
 3)
– Continued on next page –
Manufactured under license from Dolby Laboratories.
Dolby, Pro Logic, and the double-D symbol are trademarks of Dolby 
Laboratories.
Manufactured under license under U.S. Patent 
#’s: 5,451,942; 5,956,674; 5,974,380; 5,978,762; 6,226,616; 6,487,535; 
7,003,467; 7,212,872 & other U.S. and worldwide patents issued & 
pending. DTS, DTS Digital Surround, ES, and Neo:6 are registered 
trademarks and the DTS logos, Symbol and DTS 96/24 are trademarks of 
DTS, Inc. © 1996-2007 DTS, Inc. All Rights Reserved. 
This receiver incorporates High-Defi nition Multimedia Interface 
(HDMI
TM
) technology.
HDMI, the HDMI logo and High-Defi nition Multimedia Interface 
are trademarks or registered trademarks of HDMI Licensing LLC. 
The XM name and related logo are registered 
trademarks of XM Satellite Radio Inc. All rights reserved.
“x.v.Color” and “x.v.Color” logo are trademarks of 
Sony Corporation.
“BRAVIA” and BRAVIA are trademarks of Sony Corporation. 
Photo: Black type
STR-DG720
2
1) Measured under the following conditions:
Area code 
Power requirements
US, CND  
120 V AC, 60 Hz
AEP, TH 
230 V AC, 50 Hz
2) Reference power output for front, center, surround and surround back 
 speakers. 
  Depending on the sound fi eld settings and the source, there may be 
  no sound output.
3) Measured under the following conditions:
Area code 
Power requirements
TH 
220 V AC, 50 Hz
Frequency response
  Analog 
10 Hz – 70 kHz
   
+0.5/–2 dB (with sound
   
fi eld and equalizer bypassed)
Inputs
  Analog 
Sensitivity: 500 mV/
  
50 
kohms
   
S/N 3) : 96 dB
   
(A, 500 mV 
4)
 )
  Digital (Coaxial) 
Impedance: 75 ohms
   
S/N: 100 dB
   
(A, 20 kHz LPF)
  Digital (Optical) 
S/N: 100 dB
   
(A, 20 kHz LPF)
Output (Analog)
  AUDIO OUT 
Voltage: 500 mV/10 kohms
  SUB WOOFER 
Voltage: 2 V/1 kohm
Tone
  Gain levels 
±6 dB, 1 dB step
3) INPUT SHORT (with sound fi eld and equalizer bypassed).
4) Weighted network, input level.
FM tuner section
Tuning range 
87.5 – 108.0 MHz
Antenna FM 
wire 
antenna
Antenna terminals 
75 ohms, unbalanced
Intermediate frequency 
10.7 MHz
AM tuner section
Tuning range
  Models of area code US, CND
  With 10-kHz tuning scale: 
530 – 1,710 kHz 
5)
  With 9-kHz tuning scale: 
531 – 1,710 kHz 
5)
  Models of area code AEP, TH
  With 9-kHz tuning scale: 
531 – 1,602 kHz
Antenna Loop 
antenna
Intermediate frequency 
450 kHz
5) You can change the AM tuning scale to 9 kHz or 10 kHz. After tuning
  in any AM station, turn off the receiver. While holding down TUNING
 MODE, 
press 
?/1. All preset stations will be erased when you change
  the tuning scale. To reset the scale to 10 kHz (or 9 kHz), repeat the
 procedure.
Video section
Inputs/Outputs
 Video: 
Vp-p/75 
ohms
  COMPONENT VIDEO: 
Y: 1 Vp-p/75 ohms
   
P
B
/C
B
: 0.7 Vp-p/
  
75 
ohms
   
P
R
/C
R
: 0.7 Vp-p/
  
75 
ohms
   
80 MHz HD Pass Through
General
Power requirements
Area code 
Power requirements
US, CND 
120 V AC, 60 Hz
AEP 
230 V AC, 50/60 Hz
TH 
220 – 230 V AC, 50/60 Hz
Power output (DIGTAL MEDIA PORT)
  DC OUT : 
5 V, 0.7 A MAX
Power consumption
Area code 
Power consumption
US 250 
W
CND 340 
VA
AEP 220 
W
TH 210 
W
Power consumption (during standby mode)
   
0.3 W (when “CONTROL FOR HDMI”
   
in VIDEO menu is set to “CTRL OFF”)
Dimensions (w/h/d) (Approx.)
   
430 × 157.5 × 318 mm
  
(16 
7/8
 × 6 
2/8
 × 12 
5/8 
inches) including
   
projecting parts and controls
Mass (Approx.) 
8.2 kg (18 lb 2 oz) (US, CND)
   
8.1 kg (AEP, UK)
Supplied accessories
  Operating Instruction (1)
  Quick Setup Guide (1)
  FM wire antenna (aerial) (1)
  AM loop antenna (aerial) (1)
  Remote commander RM-AAU021 (1) (US, CND)
  Remote commander RM-AAU023 (1) (AEP, UK)
  R6 (size-AA) batteries (2)
  Optimizer microphone ECM-AC2 (1)
Design and specifi cations are subject to change without notice.
• Abbreviation
  CND  : Canadian model
 TH  : 
Thai 
model
Ver. 1.1
STR-DG720
3
Part No.
Model
Part No.
US
3-093-898-0
[]
Canadian
3-093-898-1
[]
AEP
3-093-898-2
[]
Thai
3-093-898-4
[]
SAFETY  CHECK-OUT (US MODEL)
After correcting the original service problem, perform the follow-
ing safety check before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs, 
screws, and all other exposed metal parts for AC leakage.
Check leakage as described below.
LEAKAGE  TEST
The AC leakage from any exposed metal part to earth ground and 
from all exposed metal parts to any exposed metal part having a 
return to chassis, must not exceed 0.5 mA (500 microamperes.). 
Leakage current can be measured by any one of three methods.
1.  A commercial leakage tester, such as the Simpson 229 or RCA 
WT-540A. Follow the manufacturers’ instructions to use these 
instruments.
2.  A battery-operated AC milliammeter. The Data Precision 245 
digital multimeter is suitable for this job.
3.  Measuring the voltage drop across a resistor by means of a 
VOM or battery-operated AC voltmeter. The “limit” indication 
is 0.75 V, so analog meters must have an accurate low-voltage 
scale. The Simpson 250 and Sanwa SH-63Trd are examples 
of a passive VOM that is suitable. Nearly all battery operated 
digital multimeters that have a 2 V AC range are suitable.  (See 
Fig. A)
Fig. A.  Using an AC voltmeter to check AC leakage.
SAFETY-RELATED COMPONET WARNING!
COMPONENTS  IDENTIFIED  BY  MARK 
0 OR  DOTTED  LINE  
WITH  MARK 
0 ON  THE  SCHEMATIC  DIAGRAMS  AND  IN  
THE  PARTS  LIST  ARE  CRITICAL  TO  SAFE  OPERATION.
REPLACE  THESE  COMPONENTS  WITH  SONY  PARTS 
 
WHOSE  PART  NUMBERS  APPEAR  AS  SHOWN  IN  THIS  
MANUAL  OR  IN  SUPPLEMENTS  PUBLISHED  BY  SONY.
ATTENTION  AU  COMPOSANT  AYANT  RAPPORT  
À  LA  SÉCURITÉ!
LES  COMPOSANTS  IDENTIFIÉS  PAR  UNE  MARQUE  
0 SUR  
LES  DIAGRAMMES  SCHÉMATIQUES  ET  LA  LISTE  DES  
PIÈCES  SONT  CRITIQUES  POUR  LA  SÉCURITÉ  DE  FONC-
TIONNEMENT.  NE  REMPLACER  CES  COM-  POSANTS  QUE  
PAR  DES  PIÈCES  SONY  DONT  LES  NUMÉROS  SONT  DON-
NÉS  DANS  CE  MANUEL  OU  DANS  LES  SUPPLÉMENTS  
PUBLIÉS  PAR  SONY.
1.5 k
Ω
0.15
μF
AC
voltmeter
(0.75 V) 
To Exposed Metal 
Parts on Set 
Earth Ground
MODEL IDENTIFICATION
–BACK PANEL–
UNLEADED  SOLDER
Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with 
the lead free mark due to their particular size)
 : LEAD  FREE  MARK
Unleaded solder has the following characteristics.
•  Unleaded solder melts at a temperature about 40 °C higher 
than ordinary solder.
 
Ordinary soldering irons can be used but the iron tip has to be 
applied to the solder joint for a slightly longer time.
 
Soldering irons using a temperature regulator should be set to 
about 350 °C.
Caution:  The printed pattern (copper foil) may peel away if the 
heated tip is applied for too long, so be careful!
• Strong 
viscosity
 
Unleaded solder is more viscous (sticky, less prone to fl ow) 
than ordinary solder so use caution not to let solder bridges 
occur such as on IC pins, etc.
• 
Usable with ordinary solder
 
It is best to use only unleaded solder but unleaded solder may 
also be added to ordinary solder.
Notes on chip component replacement
• 
Never reuse a disconnected chip component.
• 
Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
Special Component Notice
The components identifi ed by mark 
9 contain confi dential infor-
mation.
Strictly follow the instructions whenever the components are re-
paired and/or replaced.
Notice pour composants spéciaux
Les composants identifi és par la marque 
9 contiennent des infor-
mations confi dentielles.
Suivre scrupuleusement les instructions chaque fois qu’un com-
posant est remplacé et / ou réparé.
Ver. 1.1
STR-DG720
4
1. GENERAL
 
Description and location of parts (US, Canadian model) ... 5
 
Description and location of parts (AEP, Thai model) ......... 7
2. DISASSEMBLY
2-1. Case 
................................................................................... 10
2-2.  Back Panel Section ........................................................... 11
2-3.  Front Panel Section ........................................................... 11
2-4. DIGITAL 
Board 
................................................................ 12
2-5.  MAIN Board Section ........................................................ 12
2-6. STANDBY 
Board 
............................................................. 13
3. TEST MODE 
 .................................................................... 14
4. FM TUNER CHECK 
 ...................................................... 15
5. DIAGRAMS
5-1.  Block Diagram – Tuner/Audio Section – ......................... 17
5-2.  Block Diagram – Digital Section – ................................... 18
5-3.  Block Diagram – Video Section – .................................... 19
5-4.  Block Diagram – HDMI RE Section – ............................. 20
5-5.  Block Diagram – XM Section (US, Canadian model) – ... 21
5-6.  Block Diagram – Key/Display Section – .......................... 22
5-7.  Block Diagram – Power Section – .................................... 23
5-8.  Printed Wiring Boards – Main Section – .......................... 25
5-9.  Schematic Diagram – Main Section (1/3) – ...................... 26
5-10.  Schematic Diagram – Main Section (2/3) – ...................... 27
5-11.  Schematic Diagram – Main Section (3/3) – ...................... 28
5-12.  Printed Wiring Board – Digital Section (1/2) – ................ 29
5-13.  Printed Wiring Board – Digital Section (2/2) – ................ 30
5-14.  Schematic Diagram – Digital Section (1/3) – ................... 31
5-15.  Schematic Diagram – Digital Section (2/3) – ................... 32
5-16.  Schematic Diagram – Digital Section (3/3) – ................... 33
5-17.  Printed Wiring Boards – Video Section – ......................... 34
5-18.  Schematic Diagram – Video Section – ............................. 35
5-19.  Printed Wiring Board – HDMI RE Section (1/2) – .......... 36
5-20.  Printed Wiring Board – HDMI RE Section (2/2) – .......... 37
5-21.  Schematic Diagram – HDMI RE Section (1/2) – ............. 38
5-22.  Schematic Diagram – HDMI RE Section (2/2) – ............. 39
5-23. Printed Wiring Board 
 
– XM Section (US, Canadian model) – ............................ 40
5-24. Schematic Diagram 
 
– XM Section (US, Canadian model) – ............................ 41
5-25.  Printed Wiring Boards – DCAC, Power Section – ........... 42
5-26.  Schematic Diagram – DCAC, Power Section – ............... 42
5-27.  Printed Wiring Board – Display Section – ........................ 43
5-28.  Schematic Diagram – Display Section – .......................... 44
5-29.  Printed Wiring Boards – Power Section – ........................ 45
5-30.  Schematic Diagram – Power Section – ............................. 46
5-31.  Schematic Diagram – DC-DC Converter Section – ......... 47
6. EXPLODED VIEWS
6-1. Case 
Section 
...................................................................... 70
6-2.  Front Panel Section ........................................................... 71
6-3.  Back Panel Section ........................................................... 72
6-4. Chassis 
Section 
................................................................. 73
7. ELECTRICAL PARTS LIST 
 ....................................... 74
TABLE  OF  CONTENTS
Ver. 1.1
Page of 92
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  • Here you can View online or download the Service Manual for the Sony STR-DG720 in PDF for free, which will help you to disassemble, recover, fix and repair Sony STR-DG720 Audio. Information contained in Sony STR-DG720 Service Manual (repair manual) includes:
  • Disassembly, troubleshooting, maintenance, adjustment, installation and setup instructions.
  • Schematics, Circuit, Wiring and Block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Exploded View and Parts List.