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SERVICE MANUAL
FM STEREO FM-AM RECEIVER
SPECIFICATIONS
STR-DA1ES/DB780
Photo: STR-DA1ES
Ver 1.0 2002.06
9-874-062-01
Sony Corporation
2002F0500-1
Home Audio Company
C
2002.06
Published by Sony Engineering Corporation
US Model
Canadian Model
STR-DA1ES
AEP Model
UK Model
E Model
Chinese Model
STR-DB780
­ Continued on next page ­
This receiver incorporates Dolby* Digital and Pro
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.
** "DTS" and "DTS Digital Surround" are registered
trademarks of Digital Theater Systems, Inc.
1) Depending on the sound field settings and the
source, there may be no sound output.
2) Measured under the following conditions:
Area code
Power requirements
SP, CEL, CEK
230 V AC, 50 Hz
TW
110 V AC, 60 Hz
3) Measured under the following conditions:
Area code
Power requirements
CN, KR
220 V AC, 50 Hz
Frequency response
PHONO
CD/SACD, MD/
TAPE, TV/SAT,
DVD/LD, VIDEO 1, 2,
3
Inputs (Analog)
PHONO
MULTI CH IN, CD/
SACD, MD/TAPE,
DVD/LD, TV/SAT,
VIDEO 1, 2, 3
4) INPUT SHORT.
5) Weighted network, input level.
Inputs (Digital)
ASSIGNABLE
COAXIAL IN (DVD/
LD CD/SACD)
DVD/LD, TV/SAT,
MD/TAPE (Optical)
RIAA equalization curve
±0.5 dB
10 Hz ­ 100 kHz
+0.5/­2 dB (with sound
field and equalizer
bypassed)
Sensitivity: 2.5 mV
Impedance: 50 kilohms
S/N4): 86 dB (A, 2.5 mV5))
Sensitivity: 150 mV
Impedance: 50 kilohms
S/N4): 100 dB
(A, 150 mV5))
AUDIO POWER SPECIFICATIONS
POWER OUTPUT AND TOTAL
HARMONIC DISTORTION:
(Models of area code U only)
With 8 ohm loads, both channels driven, from
20 ­ 20,000 Hz; rated 100 watts per channel
minimum RMS power, with no more than
0.05 % total harmonic distortion from
250 milliwatts to rated output.
Amplifier section
POWER OUTPUT
Models of area code U, CA
Rated Power Output at Stereo Mode
(8 ohms 20 Hz ­ 20 kHz, THD 0.09 %)
100 W + 100 W
(4 ohms 20 Hz ­ 20 kHz, THD 0.09 %)
80 W + 80 W
Reference Power Output
(8 ohms 20 Hz ­ 20 kHz, THD 0.09 %)
FRONT1):100 W + 100 W
CENTER1): 100 W
SURR1): 100 W + 100 W
(4 ohms 20 Hz ­ 20 kHz, THD 0.09 %)
FRONT:1) 80 W + 80 W
CENTER1): 80 W
SURR1): 80 W + 80 W
Models of other area codes
Rated Power Output at Stereo Mode
(8 ohms 1 kHz, THD 0.7 %)
100 W + 100 W2)
90 W + 90 W3)
(4 ohms 1 kHz, THD 0.7 %)
90 W + 90 W2)
80 W + 80 W3)
Impedance: 75 ohms
S/N: 100 dB
(A, 20 kHz LPF)
S/N: 100 dB
(A, 20 kHz LPF)
Reference Power Output2)
(8 ohms 1 kHz, THD 0.7 %)
FRONT1): 100 W + 100 W
CENTER1): 100 W
SURR1): 100 W + 100 W
(4 ohms 1 kHz, THD 0.7 %)
FRONT1): 80 W + 80 W
CENTER1): 80 W
SURR1): 80 W + 80 W
(8 ohms 20 Hz ­ 20 kHz, THD 0.09 %)
FRONT1): 90 W + 90 W
CENTER1): 90 W
SURR1): 90 W + 90 W
(4 ohms 20 Hz ­ 20 kHz, THD 0.09 %)
FRONT1): 75 W + 75 W
CENTER1): 75 W
SURR1): 75 W + 75 W


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2
STR-DA1ES/DB780
Outputs
MD/TAPE (REC
OUT), VIDEO 1, 2
(AUDIO OUT)
FRONT L/R,
CENTER,
SURROUND L/R,
SUB WOOFER
(Models of area code
U, CA only)
SUB WOOFER
(Models of other area
codes)
EQ
BASS:
99 Hz~1.0 kHz
(21 steps)
TREBLE:
1.0 kHz~10 kHz
(23 steps)
Gain levels:
±10 dB, 0.5 dB step
FM tuner section
Tuning range
87.5 - 108.0 MHz
Antenna terminals
75 ohms, unbalanced
Sensitivity
Mono:
18.3 dBf, 2.2
µV/75 ohms
Stereo:
38.3 dBf, 22.5
µV/75 ohms
Usable 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
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 U, CA
With 10-kHz tuning scale: 530 ­ 1,710 kHz6)
With 9-kHz tuning scale: 531 ­ 1,710 kHz6)
Models of area code CN, SP, CEL, CEK, TW,
KR
With 9-kHz tuning scale: 531 ­ 1,602 kHz
Antenna
Loop antenna
Usable sensitivity
50 dB/m (at 1,000 kHz or
999 kHz)
S/N
54 dB (at 50 mV/m)
Harmonic distortion
0.5 % (50 mV/m,
400 Hz)
Selectivity
At 9 kHz:
35 dB
At 10 kHz:
40 dB
6) You can change the AM tuning scale to 9 kHz or
10 kHz. After tuning in any AM station, turn off
the receiver. Hold down TUNING + and 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:
1 Vp-p, 75 ohms
S-video:
Y: 1 Vp-p, 75 ohms
C: 0.286 Vp-p, 75 ohms
COMPONENT VIDEO
(Except for models of area code CEL, CEK):
Y: 1 Vp-p, 75 ohms
B-Y: 0.7 Vp-p, 75 ohms
R-Y: 0.7 Vp-p, 75 ohms
Voltage: 150 mV
Impedance: 10 kilohms
Voltage: 2 V
Impedance: 1 kilohms
Voltage: 2 V
Impedance: 1 kilohms
General
Power requirements
Area code
Power requirements
U, CA
120 V AC, 60 Hz
CEL, CEK
230 V AC, 50/60 Hz
CN, SP, KR
220 ­ 230 V AC, 50/60 Hz
TW
110 V AC, 60 Hz
Power consumption
Area code
Power consumption
U
280 W
CA
330 VA
CEL, CEK
290 W
CN, SP, KR
290 W
TW
290 W (MAX 500W)
Power consumption (during standby mode)
0.5 W
AC outlets
Area code
AC outlets
U, CA
1 switched, 120 W/1A MAX
SP, TW
1 switched, 100 W MAX
Dimensions
430
× 161 × 400 mm
including projecting parts
and controls
Mass (Approx.)
12.5 kg
Supplied accessories
FM wire antenna (1)
AM loop antenna (1)
Models of area code U, CA;
Remote commander RM-PP506L (1)
R6 (size-AA) batteries (2)
Models of other area codes;
Remote commander RM-U305C (1)
R6 (size-AA) batteries (2)
Design and specifications are subject to change
without notice.


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3
STR-DA1ES/DB780
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.
Fig. A.
Using an AC voltmeter to check AC leakage.
1.5 k
0.15 µF
AC
voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Earth Ground
SAFETY CHECK-OUT
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 pas-
sive VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2 V AC range are suitable. (See Fig. A)
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 FONCTIONNEMENT. NE REMPLACER CES COM-
POSANTS QUE PAR DES PIÈCES SONY DONT LES
NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.
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 PUB-
LISHED BY SONY.


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4
STR-DA1ES/DB780
1.
SERVICING NOTES ............................................... 5
2.
GENERAL ................................................................... 6
3.
DISASSEMBLY
3-1. Disassembly Flow ...........................................................
7
3-2. Case (414535) .................................................................
8
3-3. S-VIDEO board, VIDEO Board and Tuner ....................
8
3-4. VIDEO.AU Board ...........................................................
9
3-5. DIGITAL Board ..............................................................
9
3-6. MAIN Board ................................................................... 10
4.
TEST MODE .............................................................. 11
5.
DIAGRAMS
5-1. Block Diagram
­ TUNER/VIDEO INPUT Section ­ .............................. 13
5-2. Block Diagram ­ AUDIO DSP Section ­ ...................... 14
5-3. Block Diagram ­ AUDIO CONTROL Section ­ .......... 15
5-4. Block Diagram ­ POWER AMP Section ­ ................... 16
5-5. Block Diagram
­ DISPLAY/KEY CONTROL Section ­ ........................ 17
5-6. Block Diagram ­ POWER SUPPLY Section ­ ............. 18
5-7. Note for Printed Wiring Boards
and Schematic Diagrams ................................................ 19
5-8. Schematic Diagram ­ DIGITAL (1/3)/
V-3 OPT Boards ­ ........................................................... 21
5-9. Schematic Diagram ­ DIGITAL Board (2/3) ­ ............. 22
5-10. Schematic Diagram ­ DIGITAL Board (3/3) ­ ............. 23
5-11. Printed Wiring Board
­ DIGITAL Board (Component Side) ­ ......................... 24
5-12. Printed Wiring Boards
­ DIGITAL (Conductor Side)/V-3 OPT Boards ­ ......... 25
5-13. Printed Wiring Board ­ VIDEO Board ­ ....................... 26
5-14. Schematic Diagram ­ VIDEO Board ­ ......................... 27
5-15. Printed Wiring Boards
­ S-VIDEO/VIDEO 3/VIDEO.AU Boards ­ ................. 28
5-16. Schematic Diagram
­ S-VIDEO/VIDEO 3/VIDEO.AU Boards ­ ................. 29
5-17. Printed Wiring Board ­ MAIN Board ­ ........................ 30
5-18. Schematic Diagram ­ MAIN Board (1/3) ­ .................. 31
5-19. Schematic Diagram ­ MAIN Board (2/3) ­ .................. 32
5-20. Schematic Diagram ­ MAIN Board (3/3) ­ .................. 33
5-21. Printed Wiring Board ­ BIAS Board ­ .......................... 34
5-22. Schematic Diagram ­ BIAS Board ­ ............................. 35
5-23. Printed Wiring Boards ­ H.P/PRE/SPOUT Boards ­ ... 36
5-24. Schematic Diagram ­ H.P/PRE/SPOUT Boards ­ ....... 37
5-25. Printed Wiring Board ­ DISPLAY Board ­ .................. 38
5-26. Schematic Diagram ­ DISPLAY Board ­ ..................... 39
5-27. Printed Wiring Boards
­ KEY/MUTING/POWER Boards ­ .............................. 40
5-28. Schematic Diagram
­ KEY/MUTING/POWER Boards ­ .............................. 41
5-29. Printed Wiring Boards
­ AC/DC 1/DC 2/PR 1/SEC 1 Boards ­ ......................... 42
5-30. Schematic Diagram
­ AC DC 1/DC 2/PR 1/SEC 1 Boards ­ ......................... 43
5-31. IC Pin Function Description ........................................... 49
6.
EXPLODED VIEWS
6-1. Case Section .................................................................... 55
6-2. Front Panel Section-1 ...................................................... 56
6-3. Front Panel Section-2 ...................................................... 57
6-4. Chassis Section-1 ............................................................ 58
6-5. Chassis Section-2 ............................................................ 59
6-6. Chassis Section-3 ............................................................ 60
6-7. Chassis Section-4 ............................................................ 61
6-8. BIAS Board Section ........................................................ 62
6-9. MAIN Board Section ...................................................... 63
6-10. Foot Section .................................................................... 64
7.
ELECTRICAL PARTS LIST ............................... 65
TABLE OF CONTENTS


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5
STR-DA1ES/DB780
SECTION 1
SERVICING NOTES
· MODEL IDENTIFICATION
­ Back Panel ­
PART No.
Model
PART No.
DA1ES : US model
4-240-601-0[]
DB780 : AEP and UK models
4-240-601-1[]
DB780 : Singapore and
Malaysia models
4-240-601-2[]
DB780 : Taiwan model
4-240-601-3[]
DB780 : Korean model
4-240-601-4[]
DB870 : Chinese model
4-240-601-5[]
DA1ES : Canadian model
4-240-601-6[]
Connect jig (extension cable J-2501-208-A)
to the MAIN board (CN806, CN807) and
DIGITAL board (CN1102, CN1103).
Note: The power cord can be used unplugged from the
back panel though, as it is hard to do it,
it is easier to prepare other power cord and
use it as a jig.
DIGITAL board
MAIN board
power cord
SERVICE POSITION
In checking the DIGITAL board, prepare jig (extension cable J-2501-208-A: 200 mm 21 core).