Read Sony MHC-W770AV / STR-W770 Service Manual online
STR-W770
E Model
Australian Model
SERVICE MANUAL
FM STEREO/FM-AM RECEIVER
MICROFILM
STR-W770 is RECEIVER section in
MHC-W770AV.
MHC-W770AV.
SPECIFICATIONS
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range
Tuning range
87.5-108.0MHz
Aerial
FM lead aerial
Aerial terminals
75 ohm unbalanced
Intermediate frequency 10.7MHz
AM tuner section
Tuning range
Tuning range
(Thai,Australian,E)
AM: 530-1,710kHz
AM: 530-1,710kHz
(with interval set at 10kHz)
531-1,710kHz
(with interval set at 9kHz)
531-1,710kHz
(with interval set at 9kHz)
(EXCEPT Thai,Australian,E)
MW: 531-1,602kHz
MW: 531-1,602kHz
(with interval set at 9kHz)
(EXCEPT Thai,Australian,E)
SW: 5.95-17.90MHz
SW: 5.95-17.90MHz
(with interval set at 9kHz)
Intermediate frequency 450kHz
Aerial
Aerial
AM loop aerial,
External aerial terminal
External aerial terminal
Video section
Inputs
Inputs
AV INPUT VIDEO
(phone jack) :
1 Vp-p, 75 ohms
MONITOR OUT
(phone jack) :
1 Vp-p, 75 ohms
(phone jack) :
1 Vp-p, 75 ohms
MONITOR OUT
(phone jack) :
1 Vp-p, 75 ohms
Amplifier section
DIN power output
DIN power output
80W +80W
(6 ohms at 1kHz, DIN)
(6 ohms at 1kHz, DIN)
Music power output
190W + 190W
(6 ohms at 1kHz, 10%, THD)
(6 ohms at 1kHz, 10%, THD)
Inputs
MD/VIDEO 1 IN (phono jacks) : voltage 250 mV,
impedance 47 kilo ohms AV INPUT AUDIO
(phone jacks) : voltage 250 mV, impedance 47
kilo ohms
MIX/MIC (phone jack) :sensitivity 1mV,
impedance 10 kilo ohms
impedance 47 kilo ohms AV INPUT AUDIO
(phone jacks) : voltage 250 mV, impedance 47
kilo ohms
MIX/MIC (phone jack) :sensitivity 1mV,
impedance 10 kilo ohms
Outputs
MD/VIDEO 1 OUT
(phone jacks) : voltage 250
mV, impedance 1 kilo ohm
PHONES (stereo phone
jack) : accepts headphone
of 8 ohms or more.
SPEAKER : accepts
impedance of 6 to 16
ohms
SUPER WOOFER :
Voltage 1 V, impedance 1
kilo ohms
(phone jacks) : voltage 250
mV, impedance 1 kilo ohm
PHONES (stereo phone
jack) : accepts headphone
of 8 ohms or more.
SPEAKER : accepts
impedance of 6 to 16
ohms
SUPER WOOFER :
Voltage 1 V, impedance 1
kilo ohms
— Continued on next page —
Manufactured under license from Dolby Laboratories
Licensing Corporation.
“DOLBY”, “PRO LOGIC” and the double-D symbol
Licensing Corporation.
“DOLBY”, “PRO LOGIC” and the double-D symbol
a
are
trademarks of Dolby Laboratories Licensing Corporation.
— 2 —
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tentalum capacitor may be damaged
• Never reuse a disconnected chip component.
• Notice that the minus side of a tentalum capacitor may be damaged
by heat.
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.
COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS
APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS
PUBLISHED BY SONY.
MODEL IDENTIFICATION
— Model Number Label —
Australian : AC 240V AC, ~ 50/60Hz 170W
Thai : AC 220V AC, ~ 50/60Hz 170W
OTHER MODEL : AC 110-120V, 220-240V selectable
~ 50/60Hz 170W
MODEL IDENTIFICATION
MODEL No.STR-W770
FM STEREO/FM-AM RECEIVER
TABLE OF CONTENTS
1.
GENERAL
······································································ 3
2.
TEST MODE
·································································· 5
3.
DIAGRAMS
···································································· 6
3-1.
Circuit Boards Location ····················································· 6
3-2.
Printed Wiring Board — Panel Section — ························· 7
3-3.
Schematic Diagram — Panel Section — ··························· 9
3-4.
Printed Wiring Board — Main Section — ······················· 12
3-5.
Schematic Diagram — Main Section — ·························· 15
3-6.
Printed Wiring Board and Schematic Diagram
— Power Section — ························································ 19
— Power Section — ························································ 19
3-7.
Printed Wiring Board and Schematic Diagram
— Mic Echo/AV in Section — ········································ 23
— Mic Echo/AV in Section — ········································ 23
3-8.
Printed Wiring Board and Schematic Diagram
— Power Section — ························································ 26
— Power Section — ························································ 26
3-9.
IC Pin Function ································································ 29
3-10. IC Block Diagrams ··························································· 31
4.
EXPLODED VIEWS
4-1.
Main Section ····································································· 33
4-2.
Panel Section ···································································· 34
5.
ELECTRICAL PARTS LIST
··································· 35
General
Power requirements
Power requirements
240V AC, 50/60 Hz (Australian)
220V AC, 50/60 Hz (Thai)
110 - 120V/220-240V AC adjustable, 50/60 Hz
220V AC, 50/60 Hz (Thai)
110 - 120V/220-240V AC adjustable, 50/60 Hz
(OTHER MODEL)
Power consumption
170 watts
Dimensions (w / h / d)
Approx. 280
×
205
×
336 mm
Mass
Approx. 7.0 kg
Design and specifications are subject to change without notice.
— 3 —
SECTION 1
GENERAL
— FRONT PANEL —
1
KARAOKE PON/MPX button
2
SURROUND button
3
EFFECT ON/OFF button
4
MUSIC button
5
MOVIE button
6
GAME button
7
P FILE button
8
MEMO button
9
DBFB button
!º
VOLUME
!¡
GROOVE button
!™
TUNER BAND button
!£
MONO/ST button
!¢
FUNCTION button
!∞
MIC LEVEL
!§
MIX MIC jack
!¶
PHONES jack
!•
EDIT button
!ª
PLAY MODE button
@º
1/ALL DISCS button
@¡
REPEAT button
@™
HIGH FREQ button
@£
ENTER/NEXT button
@¢
MULTI JOG STATION dial
@∞
LOW FREQ button
@§
MEMORY button
@¶
TUNING MODE button
@•
FLASH button
@ª
LOOP button
#º
WAVE button
#¡
AV INPUT jack
#™
CLOCK TIMER SET button
#£
TIMER SELECT button
#¢
DOLBY PROLOGIC button
#∞
MODE button
#§
DISPLAY button
#¶
POWER button
1 2 3 4 5 6 7 8 9 !º !¡ !™
!£
!¢
!∞
!§
!¶
!•
!ª
@º
@¡
@™
@£
@§
@¢
@∞
@¶
@•
@ª
#º
#¡
#™
#£
#§
#¶
#∞
#¢
#¢
— 4 —
— BACK PANEL —
#•
SYSTEM CONTROL
#ª
MD/VIDEO jack
$º
FRONT SPEAKER terminal
$¡
SUPER WOOFER jack
$™
MONITOR OUT jack
$£
CENTER SPEAKER terminal
$¢
REAR SPEAKER terminal
$∞
VOLTAGE SELECTOR switch
(EXCEPT Thai, Australian model)
$§
ANTENNA terminal
Photo : E MODEL
$§
#•
#ª
$º
$¡
$™
$∞
$£ $¢