Sony STR-DB795 Service Manual ▷ View online
SERVICE MANUAL
FM STEREO FM/AM PECEIVER
AEP Model
UK Model
E Model
Australian Model
SPECIFICATIONS
STR-DB795
Ver 1.0 2004.10
9-879-195-01
2004J05-1
© 2004.10
© 2004.10
Sony Corporation
Audio Group
Published by Sony Engineering Corporation
Published by Sony Engineering Corporation
This receiver incorporates Dolby* Digital and Pro
Logic Surround and the DTS** Digital Surround
System.
* Manufactured under license from Dolby
Logic Surround and the DTS** Digital Surround
System.
* Manufactured under license from Dolby
Laboratories.
“Dolby”, “Pro Logic” and the double-D symbol are
trademarks of Dolby Laboratories.
“Dolby”, “Pro Logic” and the double-D symbol are
trademarks of Dolby Laboratories.
** “DTS” and “DTS Digital Surround” are registered
trademarks of Digital Theater Systems, Inc.
– Continued on next page –
Amplifier section
POWER OUTPUT
Models of area code AEP, UK, TW, KR, AUS
Rated Power Output at Stereo Mode
(8 ohms 1 kHz, THD 0.7%)
Models of area code AEP, UK, TW, KR, AUS
Rated Power Output at Stereo Mode
(8 ohms 1 kHz, THD 0.7%)
100 W + 100 W
2)
90 W + 90 W
3)
Reference Power Output
2)
(8 ohms 20 Hz
−20 kHz, THD 0.09%)
FRONT
1)
: 90 W + 90 W
CENTER
1)
: 90 W
SURR
1)
: 90 W + 90 W
SURR BACK
1)
: 90 W +
90 W
(8 ohms 1 kHz, THD 0.7%)
FRONT
1)
: 100 W + 100 W
CENTER
1)
: 100 W
SURR
1)
: 100 W + 100 W
SURR BACK
1)
: 100 W +
100 W
(8 ohms 1 kHz, THD 10%)
FRONT
1)
: 110 W + 110 W
CENTER
1)
: 110 W
SURR
1)
: 110 W + 110 W
SURR BACK
1)
: 110 W +
110 W
Models of area code SP, MY
Rated Power Output at Stereo Mode
(8 ohms 1 kHz, THD 0.7%)
Rated Power Output at Stereo Mode
(8 ohms 1 kHz, THD 0.7%)
90 W + 90 W
2)
Reference Power Output
2)
(8 ohms 1 kHz, THD 0.7%)
FRONT
1)
: 90 W + 90 W
CENTER
1)
: 90 W
SURR
1)
: 90 W + 90 W
SURR BACK
1)
: 90 W +
90 W
1) Depending on the sound field settings and the
source, there may be no sound output.
2) Measured under the following conditions:
3) Measured under the following conditions:
Area code
Power requirements
AEP, UK, SP, MY, KR
230 V AC, 50 Hz
AUS
240 V AC, 50 Hz
TW
110 V AC, 60 Hz
Area code
Power requirements
KR
220 V AC, 50 Hz
Frequency response
Inputs (Analog)
PHONO
RIAA equalization curve
±0.5 dB
±0.5 dB
MULTI CH IN, SA-CD/
CD, MD/TAPE, DVD,
TV/SAT, VIDEO 1, 2, 3
CD, MD/TAPE, DVD,
TV/SAT, VIDEO 1, 2, 3
10 Hz
− 100 kHz
+0.5/
−2 dB (when
ANALOG DIRECT is
selected)
selected)
PHONO
Sensitivity: 2.5 mV
Impedance: 50 kilohms
S/N
Impedance: 50 kilohms
S/N
3)
: 86 dB
(A, 2.5 mV
4)
)
MULTI CH IN, SA-CD/
CD, MD/TAPE, DVD,
TV/SAT, VIDEO 1, 2, 3
CD, MD/TAPE, DVD,
TV/SAT, VIDEO 1, 2, 3
Sensitivity: 150 mV
Impedance: 50 kilohms
S/N
Impedance: 50 kilohms
S/N
4)
: 96 dB
(A, 150 mV
5)
)
2
STR-DB795
4) INPUT SHORT.
5) Weighted network, input level.
Inputs (Digital)
Outputs
EQ
FM tuner section
Tuning range
87.5 - 108.0 MHz
Antenna
FM wire antenna
Antenna terminals
75 ohms, unbalanced
Intermediate frequency
10.7 MHz
Sensitivity
Mono:
Mono:
18.3 dBf, 2.2
µV/75 ohms
Stereo:
38.3 dBf, 22.5
µV/75 ohms
Useable sensitivity
11.2 dBf, 1
µV/75 ohms
S/N
Mono: 76 dB
Stereo: 70 dB
Harmonic distortion at 1 kHz
Mono: 0.3%
Stereo: 0.5%
Separation
Mono: 76 dB
Stereo: 70 dB
Harmonic distortion at 1 kHz
Mono: 0.3%
Stereo: 0.5%
Separation
45 dB at 1 kHz
Frequency response
30 Hz
− 15 kHz,
+0.5/
−2 dB
Selectivity
60 dB at 400 kHz
AM tuner section
Tuning range
Models of area code AEP, UK, SP, MY, TW, KR, AUS
With 9-kHz tuning scale
Models of area code AEP, UK, SP, MY, TW, KR, AUS
With 9-kHz tuning scale
531
− 1,602 kHz
Antenna
Loop antenna
Intermediate frequency
450 kHz
Usable sensitivity
50 dB/m (at 1,000 kHz or
999 kHz)
999 kHz)
S/N
54 dB (at 50 mV/m)
Harmonic distortion
0.5% (50 mV/m, 400 Hz)
Selectivity
At 9 kHz:
At 9 kHz:
35 dB
Video section
Inputs/Outputs
Video:
Video:
1 Vp-p, 75 ohms
S-video:
Y: 1 Vp-p, 75 ohms
C: 0.286 Vp-p, 75 ohms
C: 0.286 Vp-p, 75 ohms
COMPONENT VIDEO:
Y: 1 Vp-p, 75 ohms
B-Y: 0.7 Vp-p, 75 ohms
R-Y: 0.7 Vp-p, 75 ohms
80 MHz HD Pass Through
B-Y: 0.7 Vp-p, 75 ohms
R-Y: 0.7 Vp-p, 75 ohms
80 MHz HD Pass Through
General
Power requirements
DVD (Coaxial)
Impedance: 75 ohms
S/N: 100 dB
(A, 20 kHz LPF)
S/N: 100 dB
(A, 20 kHz LPF)
DVD, TV/SAT, MD,
VIDEO3 (Optical)
VIDEO3 (Optical)
S/N: 100 dB
(A, 20 kHz LPF)
(A, 20 kHz LPF)
MD/TAPE (REC OUT),
VIDEO 1, 2
(AUDIO OUT)
VIDEO 1, 2
(AUDIO OUT)
Voltage: 150 mV
Impedance: 2.2 kilohms
Impedance: 2.2 kilohms
SUB WOOFER
Voltage: 2 V
Impedance: 1 kilohms
Impedance: 1 kilohms
Gain levels
±10 dB, 1 dB step
Area code
Power requirements
AEP, UK
230 V AC, 50/60 Hz
AUS
240 V AC, 50 Hz
SP, MY
220
−230 V AC, 50/60 Hz
TW
110 V AC, 60 Hz
KR
220
−230 V AC, 50/60 Hz
Power consumption
Power consumption (during standby mode)
0.3 W (when “POWER
SAVE” in the
CUSTOMIZE menu is set
to “ON”)
SAVE” in the
CUSTOMIZE menu is set
to “ON”)
Dimensions
430
× 161 × 400 mm
including projecting parts
and controls
and controls
Mass (Approx.)
14.5 kg
Supplied accessories
FM wire antenna (1)
AM loop antenna (1)
Remote commander RM-PP413 (1)
R6 (size-AA) batteries (2)
AM loop antenna (1)
Remote commander RM-PP413 (1)
R6 (size-AA) batteries (2)
Design and specifications are subject to change
without notice.
without notice.
Area code
Power consumption
AEP, UK, SP, MY, KR, AUS 270 W
TW
650 W
• Abbreviation
AUS : Australian model
KR
KR
: Korean model
MY : Malaysia model
SP
SP
: Singapore model
TW
: Taiwan model
3
STR-DB795
SAFETY CHECK-OUT
After correcting the original service problem, perform the following
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.
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.
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.
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)
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.
1.5 k
Ω
0.15
µ
F
AC
voltmeter
(0.75 V)
voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Parts on Set
Earth Ground
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be
damaged by heat.
SAFETY-RELATED COMPONENT 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.
REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.
4
STR-DB795
TABLE OF CONTENTS
7.
EXPLODED VIEWS
7-1.
Case Section .................................................................... 68
7-2.
Chassis Section-1 ............................................................ 69
7-3.
Chassis Section-2 ............................................................ 70
7-4.
Main Block Section ......................................................... 71
7-5.
MAIN Board Block ......................................................... 72
7-6.
Chassis Section-3 ............................................................ 73
7-7.
Front Panel Block-1 ......................................................... 74
7-8.
Front Panel Block-2 ......................................................... 75
7-9.
Front Panel Block-3 ......................................................... 76
8.
ELECTRICAL PARTS LIST
................................ 77
1.
SERVICING NOTES
...............................................
5
2.
GENERAL
...................................................................
7
3.
DISASSEMBLY
3-1.
Disassembly Flow ...........................................................
9
3-2.
Case (414535) .................................................................. 10
3-3.
COMP-V Board ............................................................... 10
3-4.
Back Panel Block ............................................................ 11
3-5.
Main Block ...................................................................... 11
3-6.
DIGITAL Board .............................................................. 12
3-7.
STAY 3/STAY 4/SP-B/SP-A/S-VIDEO/VIDEO/
VIDEO-AU/AU-IN Board ............................................... 12
VIDEO-AU/AU-IN Board ............................................... 12
3-8.
MAIN board .................................................................... 13
4.
TEST MODE
.............................................................. 14
5.
ELECTRICAL ADJUSTMENTS
......................... 15
6.
DIAGRAMS
6-1.
Block Diagram
−
TUNER/VIDEO Section
− .................
17
6-2.
Block Diagram
−
AUDIO DSP Section
− .......................
18
6-3.
Block Diagram
−
AUDIO CONTROL Section
− ............
19
6-4.
Block Diagram
−
AUDIO AMP Section
− ......................
20
6-5.
Block Diagram
−
DISPLAY/KEY CONTROL Section
− ........................
21
6-6.
Block Diagram
−
POWER SUPPLY Section
− ..............
22
6-7.
Printed Wiring Board
−
DIGITAL Section (1/2)
− .............................................
24
6-8.
Printed Wiring Board
−
DIGITAL Section (2/2)
− .............................................
25
6-9.
Schematic Diagram
−
DIGITAL Section (1/4)
− ............
26
6-10. Schematic Diagram
−
DIGITAL Section (2/4)
− ............
27
6-11. Schematic Diagram
−
DIGITAL Section (3/4)
− ............
28
6-12. Schematic Diagram
−
DIGITAL Section (4/4)
− ............
29
6-13. Printed Wiring Boards
−
VIDEO Section
− ....................
30
6-14. Schematic Diagram
−
VIDEO Section
− .........................
31
6-15. Printed Wiring Boards
−
S-VIDEO Section
− .................
32
6-16. Schematic Diagram
−
S-VIDEO Section
− .....................
33
6-17. Printed Wiring Board
−
COMP-V Section
− ...................
34
6-18. Schematic Diagram
−
COMP-V Section
− .....................
35
6-19. Printed Wiring Board
−
AU-IN Section
− .......................
36
6-20. Schematic Diagram
−
AU-IN Section
− ..........................
37
6-21. Printed Wiring Board
−
MAIN Section
−........................
38
6-22. Schematic Diagram
−
MAIN Section (1/3)
− .................
39
6-23. Schematic Diagram
−
MAIN Section (2/3)
− .................
40
6-24. Schematic Diagram
−
MAIN Section (3/3)
− .................
41
6-25. Printed Wiring Board
−
A CLASS Section
− ..................
42
6-26. Schematic Diagram
−
A CLASS Section
− .....................
43
6-27. Printed Wiring Board
−
SBL Section
− ...........................
44
6-28. Schematic Diagram
−
SBL Section
− ..............................
45
6-29. Printed Wiring Board
−
SP Section
− ..............................
46
6-30. Schematic Diagram
−
SP Section
− ................................
47
6-31. Printed Wiring Boards
−
DISPLAY Section
− ................
48
6-32. Schematic Diagram
−
DISPLAY Section
− ....................
49
6-33. Printed Wiring Boards
−
DC Section
− ...........................
50
6-34. Schematic Diagram
−
DC Section
− ..............................
51
6-35. Printed Wiring Boards
−
AC Section
− ...........................
52
6-36. Schematic Diagram
−
AC Section
− ................................
53