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STR-DE925/V919
US Model
Canadian Model
E Model
PX Model
STR-DE925
Chinese Model
STR-V919
SERVICE MANUAL
-- Continued on next page --
SPECIFICATIONS
Dolby Laboratories Licensing Corporation.
"DOLBY" the double-D symbol
a "AC-3" and "PRO LOGIC" are
trademarks of Dolby Laboratories Licensing Corporation.
FM STEREO FM-AM RECORDER
Sony Corporation
Home Audio Company
Published by Sony Engineering Corporation
Ver 1.1 2003. 06
9-922-896-12
2003F16-1
© 2003.06
Photo : STR-DE925
AUDIO POWER SPECIFICATIONS
POWER OUTPUT AND TOTAL HARMONIC DISTORTION:
With 8 ohm loads, both channels driven, from 20 - 20,000 Hz; rated
110 watts per channel minimum RMS power, with no more than
0.09% total harmonic distortion from 250 milliwatts to rated output
(USA model only).
Amplifier section
POWER OUTPUT
Stereo mode
(8 ohms 20 Hz - 20 kHz, THD 0.09%)
110 W + 110 W
Surround mode (8 ohms at 1 kHz, THD 0.8%)
Front: 110 W/ch
Centera): 110 W
Reara): 110 W/ch
a) Depending on the sound field settings and the source, there may be no
sound output.
Dynamic power output
165 W + 165 W, 8 ohms
230 W + 230 W, 4 ohms
Harmonic distortion at rated output
Less than 0.09% (with sound field, tone, and bass
booster bypassed)
Frequency response
PHONO: RIAA
equalization curve
±0.5 dB
CD, TAPE, MD/DAT, TAPE/MD, DVD/LD, TV/DBS,
VIDEO 1, 2, and VIDEO 3 :
10 Hz - 50 kHz +0.5/-2 dB (with sound field, tone,
and bass booster bypassed)
Inputs (Analog) PHONO:
Sensitivity: 2.5 mV
Impedance: 50 kilohms
S/Nb): 75 dB (A, 2.5 mVc))
CD, DVD/LD, TAPE, MD/DAT, TAPE/MD, TV/DBS,
VIDEO 1, 2, and VIDEO 3 :
Sensitivity: 150 mV
Impedance: 50 kilohms
S/Nb): 82 dB (A, 150 mVc))
b)78' IHF
c) Weighted network, input level
Inputs (Digital)
DVD/LD (coaxial):
Sensitivity: -
Impedance: 75 ohms
S/N: 100 dB (A, 20 kHz LPF)
DVD/LD, TV/DBS, MD/DAT (Optical):
Sensitivity: -
Impedance: -
S/N: 100 dB (A, 20 kHz LPF)
Outputs
TAPE, MD/DAT, TAPE/MD, (REC OUT); VIDEO 1, 2
(AUDIO OUT):
Voltage: 150 mV
Impedance: 10 kilohms
WOOFER:
Voltage: 2 V
Impedance: 1 kilohms
PHONES:
Accepts low - and high-impedance headphones


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-- 2 --
BASS BOOST
+6 dB at 70 Hz
Sampling Frequency
48 kHz
EQ
BASS:
100 Hz ~ 1.0 kHz (21 steps)
MID:
500 Hz ~ 5.0 kHz (21 steps)
TREBLE:
1.0 kHz ~ 10 kHz (21 steps)
Gain levels:
±10 dB, 1 dB step
FM tuner section
Tuning range
87.5 - 108.0 MHz
Antenna terminals
75 ohms, unbalanced
Sensitivity
Mono: 18.3 dBf, 4.5 µV
Stereo: 38.3 dBf, 45 µV
Usable sensitivity
11.2 dBf, 2 µV (IHF)
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
With 10-kHz tuning scale:
530 - 1710 kHzd) (US, Canadian)
530 - 1610 kHzd) (Except US, Canadian)
With 9-kHz tuning scale:
531 - 1710 kHzd) (US, Canadian)
531 - 1602 kHzd) (Except US, Canadian)
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 kHz)
Selectivity
At 9 kHz: 35 dB
At 10 kHz: 40 dB
d)You can change the AM tuning scale to 9 kHz. After tuning in any AM
station, turn off the receiver. Hold down the TUNING + button and
press the
1/u button. All preset stations will be erased when you
change the tuning scale. To reset the scale to 10 kHz, repeat the
procedure.
Video section
Input
1 Vp-p 75 ohms
Outputs
1 Vp-p 75 ohms
General
System
Tuner section:
PLL quartz-locked digital synthesizer system
Preamplifier section:
Low- noise NF type equalizer
Power amplifier section:
Pure-complementary SEPP
Power requirements
US and Canadian models :
120 V AC, 60 Hz
E, PX, Saudi Arabia models :
120/220/240 V AC selectable, 50/60 Hz
Singapore, Chinese, Malaysia models :
220 - 230 V AC, 50/60 Hz
Power consumption
US, Singapore, Chinese, Malaysia: 290 W
Canadian: 480 VA
E, PX, Saudi Arabia: 310W
AC outlets
2 switched, total 100 W
Dimensions
430
× 370 × 157.5 mm
(17
× 145/8 × 61/4 in.)
including projecting parts and controls
Mass (Approx.) 10.5 kg (23 lb 3 oz)
Supplied accessories
· FM wire antenna (1)
· AM loop antenna (1)
· Remote commander RM-LJ301 (remote) (1)
· LR6 (size-AA) alkaline batteries (3)
· Audio/video/control S connecting cord (1)
· Control S connecting cord (1)
Design and specifications are subject to change without notice.


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-- 3 --
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK
! OR DOTTED LINE WITH
MARK
! 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 IDENTIFÉS PAR UNE MARQUE
! SUR LES
DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT
CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE
REMPLACER CES COMPOSANTS QUE PAR DES PIÈSES SONY
DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPÉMENTS PUBLIÉS PAR SONY.
TABLE OF CONTENTS
After correcting the original service problem, perform the
following safety checks 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
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" 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 2V AC range are suitable. (See
Fig. A)
SAFETY CHECK-OUT
To Exposed Metal
Parts on Set
0.15
µF
1.5k
AC
voltmeter
(0.75V)
Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
1.
GENERAL ······································································ 4
2.
TEST MODE ···························································· 6
3.
DIAGRAMS
3-1.
Circuit Boards Location ····················································· 7
3-2.
Block Diagram -- Main Section -- ··································· 9
3-3.
Block Diagram -- Power Section -- ······························· 11
3-4.
Printed Wiring Board -- AMP Section -- ······················· 13
3-5.
Schematic Diagram -- AMP Section -- ·························· 15
3-6.
Printed Wiring Board -- Video Section -- ······················ 17
3-7.
Schematic Diagram -- Video Section -- ························· 19
3-8.
Printed Wiring Board --AUDIO Section -- ···················· 21
3-9.
Schematic Diagram -- AUDIO Section -- ······················ 23
3-10. Printed Wiring Board -- Input Section -- ······················· 25
3-11. Schematic Diagram -- Input Section -- ·························· 27
3-12. Printed Wiring Board -- Display Section -- ··················· 29
3-13. Schematic Diagram -- Display Section -- ······················ 31
3-14. Printed Wiring Board -- SPEAKER Section -- ·············· 33
3-15. Schematic Diagram -- SPEAKER Section -- ················· 35
3-16. Printed Wiring Board -- Power Section -- ····················· 37
3-17. Schematic Diagram -- Power Section -- ························ 39
3-18. Printed Wiring Board -- DIGATAL (SIDE A) Section --41
3-19. Printed Wiring Board -- DIGATAL (SIDE B) Section --43
3-20. Schematic Diagram -- DIGITAL Section (1/3) -- ·········· 45
3-21. Schematic Diagram -- DIGITAL Section (2/3) -- ·········· 47
3-22. Schematic Diagram -- DIGITAL Section (2/3) -- ········· 49
3-23. IC Pin Function Description ············································ 51
3-24. IC Block Diagrams ··························································· 61
4.
EXPLODED VIEWS
4-1.
Front Panel Section ·························································· 64
4-2.
Chassis Section ································································· 65
5.
ELECTRICAL PARTS LIST ··································· 66


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-- 4 --
SECTION 1
GENERAL
LOCATION AND FUNCTION OF CONTROLS
[FRONT PANEL]
Photo : STR-V919
1
1/u (POWER) button
2
MULTI CURSOR CONTROL
3
SURROUND, EQUALIZER, INDEX indicators
4
DIRECT TUNING button
5
VIDEO 1 button
6
MULTI CHANNEL DECODING indicator
7
TV/DBS button (DE925)
7
TV/LD button (V919)
8
SOUND FIELD GENRE button
9
SOUND FIELD MODE button
0
SOUND FIELD, EQ, BASS BOOST indicators
MASTER VOLUME control
!TM
BALANCE control
VIDEO 3 INPUT
MUTING button
!
SOUND FIELD ON/OFF button
BASS BOOST button
EQ ON/OFF button
INPUT MODE button
PHONO button
DVD/LD
TUNER button
@TM
VIDEO 3 button
CD button
VIDEO 2 button
@
MD/DAT button
TAPE button
Numeric buttons
SHIFT button
DISPLAY button
MEMORY button
FM/AM button
#TM
FM MODE button
SLEEP button
PHONES jack
#
TUNING +, ­ buttons
SPEAKERS A, B switche
PRESET TUNING +, ­ buttons
SET UP button
CURSOR MODE button
1
2
3
45
6
7
8
9
0
!TM
!
@TM
@
@ª¿
#TM
#


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-- 5 --
[REAR PANEL]
Photo : STR-V919
1
DIGITAL
2
ANTENNA (FM/AM)
3
TV/DBS (DE925)
3
TV/LD (V919)
4
DVD/LD (DE925)
4
DVD (V919)
5
VIDEO 2
6
VIDEO 1
7
MONITOR
8
S-LINK (US,Canadian model)
8
S-LINK (MY,SP,CH model)
9
WOOFER
0
SPEAKERS (REAR)
SPEAKER (CENTER)
!TM
WIRELESS REAR SPEAKER
IMPEDANCE SELECTOR
AC power cord
!
AC OUTLET
FRONT SPEAKERS (A/B)
TAPE/MD
SPEAKERS (FRONT)
CD
PHONO
y SIGNAL GND
Abbriviation
MY:
Malaysia
SP:
Singapore
CH:
Chinese
1
23 4 5
6
7
8 9
0
!¡ !TM !£
!
@¡ @º !ª !·