Sony STR-DB798 Service Manual ▷ View online
SERVICE MANUAL
FM STEREO FM/AM RECEIVER
AEP Model
UK Model
Taiwan Model
SPECIFICATIONS
STR-DB798
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 –
9-879-775-01
2005G05-1
© 2005.07
© 2005.07
Amplifier section
Power Output
Models of area code CEL, CEK, TW
Rated Power Output at Stereo Mode
(8 ohms 20 Hz – 20 kHz, THD 0.09%)
Models of area code CEL, CEK, TW
Rated Power Output at Stereo Mode
(8 ohms 20 Hz – 20 kHz, THD 0.09%)
100 W + 100 W
1)
(8 ohms 1 kHz, THD 0.7%)
110 W + 110 W
1)
(8 ohms 1 kHz, THD 10%)
135 W + 135 W
1)
Reference Power Output
1)
(8 ohms 20 Hz – 20 kHz, THD 0.09%)
FRONT
FRONT
2)
: 100
W/ch
CENTER
2)
: 100
W
SURR
2)
:
100 W/ch
SURR BACK
2)
:
100 W/ch
(8 ohms 1 kHz, THD 0.7%)
FRONT
FRONT
2)
: 110
W/ch
CENTER
2)
: 110
W
SURR
2)
:
110 W/ch
SURR BACK
2)
:
110 W/ch
(8 ohms 1 kHz, THD 10%)
FRONT
FRONT
2)
: 135
W/ch
CENTER
2)
: 135
W
SURR
2)
:
135 W/ch
SURR BACK
2)
:
135 W/ch
1) Measured under the following conditions:
2) Depending on the sound field settings and the
source, there may be no sound output.
Frequency response
Inputs (Analog)
3) INPUT SHORT.
4) Weighted network, input level.
Inputs (Digital)
Outputs (Analog)
Outputs (Digital)
Equalizer
Area code
Power requirements
AEP, UK
230 V AC, 50 Hz
Taiwan
110 V AC, 60 Hz
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)
+0.5/–2 dB (when
ANALOG DIRECT is
selected)
PHONO
Sensitivity: 2.5 mV
Impedance: 50 k ohms
S/N
Impedance: 50 k ohms
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 k ohms
S/N
Impedance: 50 k ohms
S/N
3)
: 96 dB
(A, 150 mV
4)
)
DVD, SA-CD/CD
(Coaxial)
(Coaxial)
Sensitivity: –
Impedance: 75 ohms
S/N: 100 dB
(A, 20 kHz LPF)
Impedance: 75 ohms
S/N: 100 dB
(A, 20 kHz LPF)
DVD, TV/SAT,
MD/TAPE, VIDEO 3
(Optical)
MD/TAPE, VIDEO 3
(Optical)
Sensitivity: –
Impedance: –
S/N: 100 dB
(A, 20 kHz LPF)
Impedance: –
S/N: 100 dB
(A, 20 kHz LPF)
MD/TAPE (OUT),
VIDEO 1, 2
(AUDIO OUT)
VIDEO 1, 2
(AUDIO OUT)
Voltage: 150 mV
Impedance: 2.2 k ohms
Impedance: 2.2 k ohms
SUB WOOFER
Voltage: 2 V
Impedance: 1 k ohm
Impedance: 1 k ohm
MD/TAPE (Optical)
Sensitivity: –
Gain levels
±10 dB, 1 dB step
Ver. 1.0 2005.07
2
STR-DB798
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
Mono: 76
dB
Stereo:
70 dB
Harmonic distortion at 1 kHz
Mono: 0.3%
Stereo: 0.5%
Separation
Mono: 0.3%
Stereo: 0.5%
Separation
45 dB at 1 kHz
Frequency response
30 Hz – 15 kHz,
+0.5/–2 dB
+0.5/–2 dB
Selectivity
60 dB at 400 kHz
AM tuner section
Tuning range
Models of area code AEP, UK, Taiwan
Models of area code AEP, UK, Taiwan
With 9-kHz tuning scale: 531 – 1,602 kHz
Antenna
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
P
P
B
/C
B
/B-Y: 0.7 Vp-p,
75 ohms
P
P
R
/C
R
/R-Y: 0.7 Vp-p,
75 ohms
80 MHz HD Pass Through
80 MHz HD Pass Through
General
Power requirements
Power consumption
Power consumption (during standby mode)
0.3 W
Dimensions (w/h/d) (Approx.)
397 160 .5 430 mm
including projecting parts
and controls
including projecting parts
and controls
Mass (Approx.)
13.5 kg
Supplied accessories
FM wire antenna (1)
AM loop antenna (1)
Remote commander RM-AAP002 (1)
R6 (size-AA) batteries (2)
AC power cord (1)
AM loop antenna (1)
Remote commander RM-AAP002 (1)
R6 (size-AA) batteries (2)
AC power cord (1)
Design and specifications are subject to change
without notice.
without notice.
Area code
Power requirements
AEP, UK
AEP, UK
230 V AC, 50/60 Hz
Taiwan
Taiwan
110 V AC, 50/60 Hz
Area code
Power consumption
290 W
520 W
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.
3
STR-DB798
TABLE OF CONTENTS
7.
EXPLODED VIEWS
7-1.
Overall Section ................................................................ 69
7-2.
Back Panel Section .......................................................... 70
7-3.
Main Board Section ......................................................... 71
7-4.
Heat Sink Section ............................................................ 72
7-5.
Chassis Section ................................................................ 73
7-6.
Front Panel Section ......................................................... 74
7-7.
Panel Base Section .......................................................... 75
8.
ELECTRICAL PARTS LIST
................................ 76
1.
SERVICING NOTES
...............................................
4
2.
GENERAL
...................................................................
6
3.
DISASSEMBLY
3-1.
Disassembly Flow ...........................................................
7
3-2.
Case .................................................................................
7
3-3.
COMP-V Board ...............................................................
8
3-4.
Back Panel Block ............................................................
8
3-5.
DIGITAL Board, A/V SYNC Board ...............................
9
3-6.
STAY-5/AU-IN/VIDEO-AU/VIDEO/S-VIDEO/
SPK-A/SPK-B Board ......................................................
SPK-A/SPK-B Board ......................................................
9
3-7.
MAIN Board Block ......................................................... 10
3-8.
MAIN Board .................................................................... 10
4.
TEST MODE
.............................................................. 11
5.
ELECTRICAL ADJUSTMENTS
......................... 12
6.
DIAGRAMS
6-1.
Block Diagram
− TUNER/VIDEO Section − ................. 13
6-2.
Block Diagram
− AUDIO DSP Section − ....................... 14
6-3.
Block Diagram
− AUDIO CONTROL Section − ............ 15
6-4.
Block Diagram
− AUDIO AMP Section − ...................... 16
6-5.
Block Diagram
− DISPLAY, KEY CONTROL
Section
− .......................................................................... 17
6-6.
Block Diagram
− POWER SUPPLY Section − ............... 18
6-7.
Printed Wiring Board
− DIGITAL Board
(Component Side)
− ....................................................... 20
6-8.
Printed Wiring Board
− DIGITAL Board
(Conductor Side)
− ......................................................... 21
6-9.
Schematic Diagram
− DIGITAL Board (1/4) − ............... 22
6-10. Schematic Diagram
− DIGITAL Board (2/4) − ............... 23
6-11. Schematic Diagram
− DIGITAL Board (3/4) − ............... 24
6-12. Schematic Diagram
− DIGITAL Board (4/4) − ............... 25
6-13. Printed Wiring Board
− A/V SYNC Board − .................. 26
6-14. Schematic Diagram
− A/V SYNC Board − ..................... 27
6-15. Printed Wiring Boards
− VIDEO Section − ................... 28
6-16. Schematic Diagram
− VIDEO Section − ......................... 29
6-17. Printed Wiring Boards
− S-VIDEO Section − ................. 30
6-18. Schematic Diagram
− S-VIDEO Section − ..................... 31
6-19. Printed Wiring Board
− COMP-V Board − .................... 32
6-20. Schematic Diagram
− COMP-V Board − ........................ 33
6-21. Printed Wiring Board
− AU-IN Board −......................... 34
6-22. Schematic Diagram
− AU-IN Board − ............................ 35
6-23. Printed Wiring Board
− MAIN Board − .......................... 36
6-24. Schematic Diagram
− MAIN Board (1/3) − .................... 37
6-25. Schematic Diagram
− MAIN Board (2/3) − .................... 38
6-26. Schematic Diagram
− MAIN Board (3/3) − .................... 39
6-27. Printed Wiring Board
− A CLASS Board − .................... 40
6-28. Printed Wiring Boards
− STAY Section − ....................... 41
6-29. Schematic Diagram
− A CLASS Section (1/2) − ............ 42
6-30. Schematic Diagram
− A CLASS Section (2/2) − ............ 43
6-31. Printed Wiring Boards
− SPEAKER Section − ............... 44
6-32. Schematic Diagram
− SPEAKER Section − ................... 45
6-33. Printed Wiring Boards
− DISPLAY Section − ................ 46
6-34. Schematic Diagram
− DISPLAY Section − .................... 47
6-35. Printed Wiring Boards
− DC Section − ........................... 48
6-36. Schematic Diagram
− DC Section − ............................... 49
6-37. Printed Wiring Board
− AC Board − ............................... 50
6-38. Schematic Diagram
− AC Board − .................................. 51
4
STR-DB798
• MODEL IDENTIFICATION
– Back Panel –
PART No.
Model
PART No.
AEP model
2-594-539-0[]
Taiwan model
2-594-539-1[]
UK model
2-594-539-4[]
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
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
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 viscou-s (sticky, less prone to flow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.
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.
also be added to ordinary solder.
SECTION 1
SERVICING NOTES