STR-DG910 - Sony Audio Service Manual (repair manual)

1

US Model

Canadian Model

AEP Model

UK Model

E Model

With 8 ohm loads, both channels driven, from
20 – 20,000 Hz; rated 100 watts per channel
minimum RMS power, with no more than
0.09 % total harmonic distortion from 250
milliwatts to rated output.

Models of area code US, CND

 1)

Minimum RMS Output Power (8 ohms, 20 Hz –
20 kHz, THD 0.09%)

100 W + 100 W

 1)

Stereo Mode Output Power (8 ohms, 1 kHz,
THD 1%)

110 W + 110 W

 1)

Surround Mode Output Power

 2)

 (8 ohms, 1 kHz,

THD 10%)

150 W per channel

 1)

Models of area code AEP, UK

 1)

Minimum RMS Output Power (8 ohms, 20 Hz –
20 kHz, THD 0.09%)

90 W + 90 W

 1)

Stereo Mode Output Power (8 ohms, 1 kHz,
THD 1%)

100 W + 100 W

 1)

Surround Mode Output Power

 2)

 (8 ohms, 1 kHz,

THD 10%)

140 W per channel

 1)

2007G04-1

© 2007. 07

This receiver incorporates Dolby

*

 Digital and Pro

Logic Surround and the DTS

**

 Digital Surround

System.

*

Manufactured under license from Dolby
Laboratories.
“Dolby”, “Pro Logic”, “Surround EX”, and the
double-D symbol are trademarks of Dolby
Laboratories.

**

“DTS” and “DTS-ES | Neo:6” are registered
trademarks of DTS, Inc. “96/24” is a trademark
of DTS, Inc.

This receiver incorporates High-Definition
Multimedia Interface (HDMI

TM

) technology.

HDMI, the HDMI logo and High-Definition
Multimedia Interface are trademarks or registered
trademarks of HDMI Licensing LLC.

XM is a registered trademark of XM Satellite Radio
Inc. (US, CND model only)

This product is manufactured under license from
Neural Audio Corporation.
Sony Corporation hereby grants the used a non-
exclusive, non-transferable, limited license right to
use this product under the US and foreign patents
pending and other related technology owned by
Neural Audio Corporation. (US, CND model only)

“Neural” and “Neural Audio” and “Neural
Surround” are trademarks of Neural Audio
Corporation. (US, CND model only)

– Continued on next page –

Photo: Black type

2

Models of area code E2, TW

 1)

Minimum RMS Output Power (8 ohms, 20 Hz –
20 kHz, THD 0.09%)

85 W + 85 W

 1)

Stereo Mode Output Power (8 ohms, 1 kHz,
THD 1%)

100 W + 100 W

 1)

Surround Mode Output Power

 2)

 (8 ohms, 1 kHz,

THD 10%)

130 W per channel

 1)

Models of area code KR

 1)

Minimum RMS Output Power (8 ohms, 20 Hz –
20 kHz, THD 0.09%)

90 W + 90 W

 1)

,

80 W + 80 W

 3)

Stereo Mode Output Power (8 ohms, 1 kHz,
THD 1%)

100 W + 100 W

 1)

,

90 W + 90 W

 3)

Surround Mode Output Power

 2)

 (8 ohms, 1 kHz,

THD 10%)

140 W per channel

 1)

,

120 W per channel

 3)

1) Measured under the following conditions:

Area code

Power requirements

US, CND

120 V AC, 60 Hz

AEP, UK, KR

230 V AC, 50 Hz

E2

240 V AC, 50 Hz

TW

110 V AC, 60 Hz

2) Reference power output for front, center, surround and

surround back speakers. Depending on the sound field
settings and the source, there may be no sound output.

3) Measured under the following conditions:

220 V AC, 60 Hz

Frequency response

Analog

10 Hz – 70 kHz
+0.5/–2 dB (with sound
field 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

Equalizer

Gain levels

±10 dB, 0.5 dB step

4) INPUT SHORT (with sound field and equalizer

bypassed).

5) Weighted network, input level.

Tuning range

87.5 – 108.0 MHz

Antenna

FM wire antenna

Antenna terminals

75 ohms, unbalanced

Intermediate frequency

10.7 MHz

Tuning range

Models of area code US, CND
With 10-kHz tuning scale: 530 – 1,710 kHz

 6)

With 9-kHz tuning scale: 531 – 1,710 kHz

 6)

Models of area code AEP, UK, KR, TW
With 9-kHz tuning scale: 531 – 1,602 kHz
Models of area code E2
With 9-kHz tuning scale: 531 – 1,602 kHz

 6)

With 10-kHz tuning scale: 530 – 1,610 kHz

 6)

Antenna

Loop antenna

Intermediate frequency

450 kHz

6) 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.

Inputs/Outputs

Video:

1 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

Power requirements

Area code

Power requirements

US, CND

120 V AC, 60 Hz

AEP, UK

230 V AC, 50/60 Hz

E2

120/220/240 V AC, 50/60 Hz

KR

220 – 230 V AC, 50/60 Hz

TW

110 V AC, 60 Hz

Power output (DIGITAL MEDIA PORT)

DC OUT

5 V, 700 mA

Power consumption

Area code

Power consumption

US

260 W

CND

360 VA

AEP, UK, KR

230 W

E2

270 W

TW

650 W

Power consumption (during standby mode)

0.3 W (When “CONTROL”
 in VIDEO menu is set to
“CTRL OFF”)

AC outlets

Area code

AC outlets

US, CND

2 switched, 120 W/1A MAX

E2

1 switched, 100 W/0.4 A MAX

Dimensions (w/h/d) (Approx.)

430 

× 157.5 × 351.5 mm

(17 

× 6 

1/4

 

× 13 

7/8

inches) including
projecting parts and
controls

Mass (Approx.)

10.6 kg (23 lb 6 oz)
(Except E2, KR)
11.2 kg (24 lb 11 oz) (E2, KR)

Supplied accessories

FM wire antenna (1)
AM loop antenna (1)
Remote commander RM-AAP016 (1) (US, CND)
Remote commander RM-AAP017 (1) (AEP, UK, E2, KR,
TW)
R6 (size-AA) batteries (2)
Optimizer microphone ECM-AC2 (1)

Design and specifications are subject to change
without notice.

• Abbreviation

CND : Canadian model
E2

: AC 120 V area in E model

KR

: Korea model

TW : Taiwan model

3

0

0

0

Ω

µ

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.

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 microampers.).
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” indica-
tion is 0.75 V, so analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa SH-63Trd are ex-
amples of a passive VOM that is suitable. Nearly all battery
operated digital multimeters that have a 2 V AC range are suit-
able.  (See Fig. A)

Part No.

US, CND

3-094-429-0s

AEP, UK

3-094-429-1s

E2

3-094-429-2s

KR

3-094-429-4s

TW

3-094-429-5s

• Abbreviation

CND : Canadian model
E2

: AC 120 V area in E model

KR : Korea model
TW : Taiwan model

When IC3511 and IC3513 on the HDMI RE board are damaged,
exchange the new HDMI RE board for the HDMI RE board which
IC damaged. When throwing away the HDMI RE board, be sure to
throw away after destroying IC3511 and IC3513 physically with
the hammer etc.

4

Description and location of parts (US, Canadian model) ........ 5
Description and location of parts (AEP, UK, E2 model) ......... 7

2-1.   Case ................................................................................... 10
2-2.   HDMI RE Board ............................................................... 11
2-3.   Back Panel Section ............................................................ 11
2-4.   Front Panel Section ........................................................... 12
2-5.   DIGITAL Board ................................................................ 12
2-6.   MAIN Board Section ........................................................ 13
2-7.   STANDBY Board ............................................................. 13

..................................................................... 14

....................................................... 15

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 SW 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 (1/4) – ...................... 26
5-10. Schematic Diagram – Main Section (2/4) – ...................... 27
5-11. Schematic Diagram – Main Section (3/4) – ...................... 28
5-12. Schematic Diagram – Main Section (4/4) – ...................... 29
5-13. Printed Wiring Board – Digital Section (1/2) – ................ 30
5-14. Printed Wiring Board – Digital Section (2/2) – ................ 31
5-15. Schematic Diagram – Digital Section (1/5) – ................... 32
5-16. Schematic Diagram – Digital Section (2/5) – ................... 33
5-17. Schematic Diagram – Digital Section (3/5) – ................... 34

5-18. Schematic Diagram – Digital Section (4/5) – ................... 35
5-19. Schematic Diagram – Digital Section (5/5) – ................... 36
5-20. Printed Wiring Board – Video Section (1/2) – .................. 37
5-21. Printed Wiring Boards – Video Section (2/2) – ................. 38
5-22. Schematic Diagram – Video Section (1/2) – ..................... 39
5-23. Schematic Diagram – Video Section (2/2) – ..................... 40
5-24. Printed Wiring Board – HDMI RE Section (1/2) – ........... 41
5-25. Printed Wiring Board – HDMI RE Section (2/2) – ........... 42
5-26. Schematic Diagram – HDMI RE Section (1/4) – .............. 43
5-27. Schematic Diagram – HDMI RE Section (2/4) – .............. 44
5-28. Schematic Diagram – HDMI RE Section (3/4) – .............. 45
5-29. Schematic Diagram – HDMI RE Section (4/4) – .............. 46
5-30. Printed Wiring Board

    – XM Section (US, Canadian Model) – ............................ 47

5-31. Schematic Diagram

    – XM Section (US, Canadian Model) – ............................ 48

5-32. Printed Wiring Board – Front Speaker Section – .............. 49
5-33. Schematic Diagram – Front Speaker Section – ................. 49
5-34. Printed Wiring Boards – DCAC, Power Key Section – .... 50
5-35. Schematic Diagram – DCAC, Power Key Section – ........ 50
5-36. Printed Wiring Board – Display Section – ........................ 51
5-37. Schematic Diagram – Display Section – ........................... 52
5-38. Printed Wiring Boards – Power Section – ......................... 53
5-39. Schematic Diagram – Power Section – ............................. 54
5-40. Printed Wiring Board – DCDC Section – ......................... 55
5-41. Schematic Diagram – DCDC Section – ............................ 55

6-1.   Case Section ...................................................................... 74
6-2.   Front Panel Section ........................................................... 75
6-3.   Back Panel Section ............................................................ 76
6-4.   Chassis Section ................................................................. 77

........................................ 78