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STR-DB830/DB930/V929X
US Model
STR-DB930/DB830
Canadian Model
STR-DB930
AEP Model
STR-DB930/DB830
E Model
Australian Model
STR-DB930
Chinese Model
STR-V929X
SERVICE MANUAL
FM STEREO FM-AM RECEIVER
-- Continued on next page --
SPECIFICATIONS
Manufactured under license from Dolby Laboratories
Licensing Corporation.
"DOLBY" and the double-D symbol
a are trademarks
of Dolby Laboratories Licensing Corporation.
Ver 1.1 2002. 02
Sony Corporation
Home Audio Company
Published by Sony Engineering Corporation
9-928-896-12
2002B1600-1
© 2002.02
AUDIO POWER SPECIFICATIONS
POWER OUTPUT AND TOTAL HARMONIC DISTORTION : With 8
loads, both channels driven, from 20 - 20,000 Hz ; rated 110 W
(STR-DB930) and 100 W (STR-DB830) per channel minimum
RMS power, with no more than 0.05 % total harmonic distortion
from 250 mW to rated output (USA model only).
Amplifier section
POWER OUTPUT
Stereo mode
North American model
(8
20 Hz - 20 kHz, THD 0.05 %)
STR-DB930 : 110 W + 110 W
STR-DB830 : 100 W + 100 W
(4
20 Hz - 20 kHz, THD 0.05 %)
STR-DB930 : 100 W + 100 W
STR-DB830 : 90 W + 90 W
Other model
100 W + 100 W (8
DIN 1kHz)
100 W + 100 W (4
DIN 1kHz)
90 W + 90 W (8
20Hz-20kHz,thd0.05%)
90 W + 90 W (4
20Hz-20kHz,thd0.05%)
Surround mode
North American model
(8
20 Hz - 20 kHz, THD 0.09 %)
STR-DB930 : Front
: 110 W + 110 W
Centera)
: 110 W
Reara)
: 110 W + 110 W
STR-DB830 : Front
: 100 W + 100 W
Centera)
: 100 W
Reara)
: 100 W + 100 W
(4
20 Hz - 20 kHz, THD 0.09 %)
STR-DB930 : Front
: 100 W + 100 W
Centera)
: 100 W
Reara)
: 100 W + 100 W
STR-DB830 : Front
: 90 W + 90 W
Centera)
: 90 W
Reara)
: 90 W + 90 W
Other model
(8
20 Hz - 20 kHz, THD 0.09 %)
Front
: 90 W + 90 W
Centera)
: 90 W
Reara)
: 90 W + 90 W
(4
20 Hz - 20 kHz, THD 0.05 %)
Front
: 90 W + 90 W
Centera)
: 90 W
Reara)
: 90 W + 90 W
a) Depending on the sound field settings and the source, there may be no
sound output.
Dynamic power output
STR-DB930 : 165 W + 165 W, 8
250 W + 250 W, 4
STR-DB830 : 155 W + 155 W, 8
240 W + 240 W, 4
Frequency response
PHONO : RIAA
equalization curve ±0.5 dB
CD, TAPE, MD/DAT, TAPE/MD, DVD/LD, TV/SAT, VIDEO
1,2, andVIDEO3:
10 Hz - 50 kHz + 0.5/-2
dB(with sound field, equalizer, and
bass boost bypassed)
Inputs(Analog)
PHONO :
Sensitivity : 2.5 mV
Impedance : 50 k
S/Nb)
: 86 dB(A, 2.5 mVc))
Photo : STR-DB930 (BLACK model)


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-- 2 --
5.1CH INPUT, CD, DVD/LD, TAPE,
MD/DAT, TAPE/MD, TV/SAT,
VIDEO 1, 2, and VIDEO 3 :
Sensitivity : 150 mV
Impedance : 50 k
S/Nb)
: 96 dB(A, 150 mVc))
b) INPUT SHORT
c) Weighted network, input level
Input(Digital)
DVD/LD (coaxial) :
Sensitivity : -
Impedance : 75
S/N
: 100 dB(A, 20 kHz LPF)
DVD/LD, TV/SAT, MD/DAT (Optical)
Sensitivity : -
Impedance : -
S/N
: 100 dB(A, 20 kHz LPF)
Outputs
TAPE, MD/DAT, TAPE/MD, (REC OUT)
; VUDEO 1, 2 (AUDIO OUT) :
Voltage
: 150 mV
Impedance
: 10 k
FRONT L/R, CENTER, REAR L/R, SUB
WOOFER :
Voltage
: 2V
Impedance
: 1 k
PHONES :
Accepts low-and high-impedance headphones
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 Hz
Antenna terminals
75
, unbalanced
Sensitivity
Mono : 18.3 dBf, 2.2 µV/75
Stereo : 38.3 dBf, 22.5 µV/75
Usable sensitivity
11.2 dBf, 1 µV/75
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
Sencitivity
60 dB at 400 kHz
AM tuner section
North American and E models
With 10-kHz tuning scale : 530 - 1,710 kHzd)
With 9-kHz tuning scale : 531 - 1,710 kHzd)
Other models
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)
Hermonic 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 9kHz. 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
Inputs
Video
: 1 Vp-p 75
S-video : Y : 1 Vp-p 75
C : 0.286 Vp-p 75
Outputs Video
: 1 Vp-p 75
S-video : Y : 1 Vp-p 75
C : 0.286 Vp-p 75
General
System Tuner section :
PLL quarts-locked digital synthesizer system
Preamplifier section :
Low-noise NF type equalizer
Power amplifier section :
Pure-complementary SEPP
Power requirements
USA, Canadian models
120V AC, 60Hz
Australian model
240V AC, 50Hz
Other model
220 ­ 230V AC 50/60Hz
Power consumption
STR-DB930
Canadian
:400 VA
Other models :290 W
STR-DB830
North American models : 280 W
AC outlets
North American models : 2 switched, total 120 W/1A
Other models : 1 switched, max 100 W
Dimensions 430
× 405 × 160.5 mm
(17
× 16 × 63/8 in.)
including projecting parts and controls
Mass(Approx.)
13 kg(28 lb 11oz)
Supplied accessories
· FM wire antenna (1)
· AM loop antenna (1)
· Audio/video/control S connecting cord (1)
· CONTROL A1 connecting cord (1)
· FM antenna adapter (1)
STR-DB930, V929X only
· Remote commander RM-LJ302 (remote) (1)
· LR6 (size-AA) alkaline batteries (3)
STR-DB830 only
· Remote commander RM-PP402 (remote) (1)
· LR6 (size-AA) batteries (2)
Design and specifications are subject to change without notice.
MODEL IDENTIFICATION
­ BACK PANEL ­
MODEL
DB930: US model
DB930: Canadian model
DB930: Malaysia, Singapore models
V929X
DB930:
Australian model
DB930: AEP model
DB830: US model
DB830:
AEP model
PARTS No.
4-217-716-0
4-217-716-1
4-217-716-2
4-217-716-3
4-217-716-4
4-217-716-5
4-217-716-6
4-217-716-7
PART NO.


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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
SAFETY CHECK-OUT
(US model only)
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)
Earth Ground
AC
voltmeter
(0.75V)
1.5k
0.15
µF
Fig. A. Using an AC voltmeter to check AC leakage.
To Exposed Metal
Parts on Set
1. GENERAL ·········································································· 4
2. SERVICEING NOTE ······················································· 6
3. TEST MODE ······································································ 6
4. DIAGRAMS
4-1.
Block Diagram Main Section ··········································· 7
4-2.
Block Diagram Power Section ········································· 9
4-3.
Circuit Board Location ····················································· 11
4-4.
Schematic Diagram Digital Section(1/3) ······················· 13
4-5.
Schematic Diagram Digital Section(2/3) ······················· 15
4-6.
Schematic Diagram Digital Section(3/3) ······················· 17
4-7.
Printed Wiring Board Digital Section(1/2) ····················· 19
4-8.
Printed Wiring Board Digital Section(2/2) ····················· 21
4-9.
Printed Wiring Board Display Section ··························· 23
4-10. Schematic Diagram Display Section ······························ 25
4-11. Printed Wiring Board Speaker Switch Section ··············· 27
4-12. Schematic Diagram Speaker Switch Section ················· 29
4-13. Printed Wiring Board Rear AMP Section ······················· 31
4-14. Schematic Diagram Rear AMP Section ························· 33
4-15. Printed Wiring Board Power Section ····························· 35
4-16. Schematic Diagram Power Section ································ 37
4-17. Printed Wiring Board Video Section ······························ 39
4-18. Schematic Diagram Video Section ································· 41
4-19. Printed Wiring Board Main Section ······························· 43
4-20. Schematic Diagram Main Section(1/2) ·························· 45
4-21. Schematic Diagram Main Section(2/2) ·························· 47
4-22. IC Pin Function ································································ 49
4-23. IC Block Diagrams ··························································· 58
5. EXPLODED VIEWS
5-1.
Front Panel Section ·························································· 62
5-2.
Chassis Section ································································· 64
6. ELECTRICAL PARTS LIST ······································· 66


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SECTION 1
GENERAL
Identifying the Parts
Front Panel
1
1/u switch
2
FUNCTION control
MODE button
3
INPUT MODE button
4
5.1CH INPUT button
5
MASTER VOLUME control
6
MUTING button
7
SLEEP button (EXCEPT AEP)
RDS PTY button (AEP model)
8
SPEAKERS selector
PHONES jack
9
DOOR OPEN button
0
DIMMER button
DISPLAY button
!TM
A.F.D button/indicator
MODE button/indicator
2CH button/indicator
MULTI CHANNEL DECODING indicator
BASS BOOST button
!
EQUALIZER button
TEST TONE button (EXCEPT AEP)
RDS EON button (AEP model)
PRESET TUNING +/- buttons
SHIFT button
FM/AM button
TUNNIG +/- buttons
FM MODE button
MEMORY button
LEVEL button
SUR button
EQ button
@TM
Cursor buttons (</>)
Jog dial
SET UP button
@
NAME button
ENTER button


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-- 5 --
-- 6 --
SECTION 3
TEST MODE
FLUORESCENT INDICATOR TUBE TEST MODE
* All fluorescent segments are tested. When this test is activated,
all segments turn on at the same time, then each segment turns on
one after another.
* Procedure:
While depressing the ENTER, the LEVEL and the EQ buttons
simultaneously, press the power [
1/u] button to turn on the main
power. All segments turn on at the same time, then each segment
turns on press the ENTER button.
FACTORY SET MODE
* All preset contents are reset to the default setting.
* Procedure:
While depressing the SET UP, the LEVEL and the ENTER buttons
simultaneously, press the power [
1/u] button to turn on the main
power. The message Factry Set appears and the present contents
are reset to the default values.
ALL CLEAR MODE
* All preset contents are cleared when this mode is activated. Use
this mode before returning the product to clients upon completion
of repair.
* Procedure:
While depressing the SET UP button simultaneously, press the
power [
1/u] button to turn on the main power. The machine enters
the DEMO mode.DEMO mode: Wait a while, then the
demonstration starts. If the power [
1/u] button is pressed often
the demonstration has started, the power is turned off, and the
demonstration resumes if the power [
1/u] button is pressed again.
ALL CLEAR mode; If the power [
1/u] button is pressed often
the machine enters the DEMO mode, but before the demonstration
starts, the display is turned off. Press [
1/u] again. No response is
returned. The press [
1/u] again. The preset data is cleared and
the machine enters the normal power-on state.
SOUND FIELD CLEAR MODE
* The preset sound field is cleared when this mode is activated.
Use this mode before returning the product to clients upon
completion of repair.
* Procedure:
While depressing the SOUND FIELD MODE button, press the
power [
1/u] button to turn on the main power. The message S.F
Initialize appears and initialization is performed.
AM CHANNEL STEP 9 kHz/10 kHz
SELECTION MODE (US,Canadian Model)
* Either the 9 kHz step or 10 kHz step can be selected for the AM
channel step.
* Procedure:
Set the FUNCTION to AM. Turn off the main power.
While depressing the TUNING+ button or the PRESET TUNING
+ button, press the power [
1/u] button to turn on the main power.
Either the message AM 9kHz Step or AM 10kHz Step appears.
Select the desired step.
DSP TEST MODE
* It tests whether the DSP works correctly or not. When the DSP
test is activated, the test data is output from the DSP (IC1401:
CXD2712R) of the DIGITAL board and is written in the RAM
(IC1402: IDT71V016S). When the test data is read from the RAM
by the DSP, the data output must be equivalent to the original
data. If they disagree, an error is triggered. Errors can be caused
by the broken data line or defective soldering.
* Procedure
While pressing the SETUP, LEVEL and SUR buttons, press the
POWER button to enter the DSP test mode. The message DSP
TEST MODE appears. When an error occurs, the message DSP2
ERROR is displayed. When there is no error, the message DSP2
NO ERROR appears and the 1 kHz signal is output to all channels.
Then, the mode can be switched the (SIGN WAVE) (THROUGH)
and (INPULSE) mode.
AUTOBETICAL MODE (AEP Model only)
* This mode is installed in the Europe models only. When this mode
is used, the receiver scans the broadcasts that can be received by
tuner, and sets up the broadcasts. Be sure to start scanning after
connecting the antenna.
Procedure:
Check that the antenna is connected. Press the POWER button
while pressing the MEMORY button to turn on the power. The
message "Autobetical select" appears and scanning starts by tuner.
VERSION MODE
* When this mode is used, the microprocessor version number is
displayed.
* Procedure:
Press the POWER button while pressing the ENTER, LEVEL,
and SUR buttons to turn on the power. The microprocessor version
number appears as follows.
SECTION 2
SERVICING NOTE
1. When the front panel is removed, the VR board is removed at the
same time. Consequently the LEDs cannot be turned on and the
sound volume cannot be increased or decreased from the remote
control.
2. When servicing the DIGITAL board, be sure to connect the earth
land of the DIGITAL board with the chassis frame so that the
earth potential of the DIGITAL board must not be floated from
the chassis frame.
Rear Panel
1
2
3
4
5
6
7
8
0
9
!TM
!
@TM
1
ANTENNA
2
SIGNAL GND
3
DIGITAL
4
5-1 CH INPUT
5
SPEAKERS (FRONT)
6
SPEAKERS (REAR)
7
SPEAKERS (CENTER)
8
PREOUT
9
IMPEDANCE SELECTOR
AC OUTLET
AC power cord
!TM
S-LINK
2ND AUDIO OUT
VIDEO 1
!
VIDEO 2
DVD/LD
TV/SAT
TAPE
MD/DAT
CD
PHONO
@TM
MONITOR