Sony STR-W770 User manual

STR-W770
E Model
Australian Model
SERVICE MANUAL
FM STEREO/FM-AM RECEIVER
MICROFILM
STR-W770 is RECEIVER section in
MHC-W770AV.
SPECIFICATIONS
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range 87.5-108.0MHz
Aerial FM lead aerial
Aerial terminals 75 ohm unbalanced
Intermediate frequency 10.7MHz
AM tuner section
Tuning range (Thai,Australian,E)
AM: 530-1,710kHz
(with interval set at 10kHz)
531-1,710kHz
(with interval set at 9kHz)
(EXCEPT Thai,Australian,E)
MW: 531-1,602kHz
(with interval set at 9kHz)
(EXCEPT Thai,Australian,E)
SW: 5.95-17.90MHz
(with interval set at 9kHz)
Intermediate frequency 450kHz
Aerial AM loop aerial,
External aerial terminal
Video section
Inputs AV INPUT VIDEO
(phone jack) :
1 Vp-p, 75 ohms
MONITOR OUT
(phone jack) :
1 Vp-p, 75 ohms
Amplifier section
DIN power output 80W +80W
(6 ohms at 1kHz, DIN)
Music power output 190W + 190W
(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
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 — Continued on next page —
Manufactured under license from Dolby Laboratories
Licensing Corporation.
“DOLBY”, “PRO LOGIC”and the double-D symbol aare
trademarks of Dolby Laboratories Licensing Corporation.

— 2 —
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Noticethattheminussideofatentalumcapacitormaybedamaged
by heat.
SAFETY-RELATED COMPONENTWARNING!!
COMPONENTS IDENTIFIED BY MARK !OR DOTTED LINEWITH
MARK !ON THE SCHEMATIC DIAGRAMS AND INTHE 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.
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
3-7. Printed Wiring Board and Schematic Diagram
— Mic Echo/AV in Section — ········································23
3-8. Printed Wiring Board and Schematic Diagram
— 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 240V AC, 50/60 Hz (Australian)
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 —
1KARAOKE PON/MPX button
2SURROUND button
3EFFECT ON/OFF button
4MUSIC button
5MOVIE button
6GAME button
7P FILE button
8MEMO button
9DBFB button
!ºVOLUME
!¡GROOVE button
!™TUNER BAND button
!£MONO/ST button
!¢FUNCTION button
!∞MIC LEVEL
!§MIX MIC jack
!¶PHONES jack
!•EDIT button
!ªPLAY MODE button
@º1/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
@ªLOOP button
#ºWAVE button
#¡AV INPUT jack
#™CLOCK TIMER SET button
#£TIMER SELECT button
#¢DOLBY PROLOGIC button
#∞MODE button
#§DISPLAY button
#¶POWER button
123456789!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
$¡
$™ $∞
$£ $¢

FL DISPLAY/KEY LED TEST MODE
PresstheREPEA T,ENTER/NEXTandSURR OUND buttons
sim ultaneousl y.
1. AllFLsegmentsandallLEDsturnon.
2. Toaccessthemicr opr ocessorinf ormation, pressthePFILE
key. Eac hpressingofthePFILEke yad vancesthedispla yon
theFLtubeinthef ollo wingsequence .
3.Toc hec ktheencoder ,presstheMUSICke y.Thef ollo wingdispla y
appearsontheFLtube.
"K0J0V0"
Then umberafterKindicatesthen umberoftimesthattheke yis
pressed. Theke ywhic hwaspressedinthepast, isnotcounted.
Theke ywhic hispressedhereafteriscounted. Pressingan yke y
increasesthenumberafterK.
ThenumberafterJindicatesthenumberofrotationsthattheJOG
dialisr otated. TurningtheJOGdialc loc kwiseincreasesthen umber
afterJ . TurningtheJOGdialcounter -cloc kwisedecreasesthe
numberafterJ.
Then umberafter V indicatesthen umberofr otationsthatthe
VOLUMEdialis r otated. Turning the VOLUME dialc loc kwise
increasesthen umberafter V. Turningthe VOLUMEdialcounter -
cloc kwisedecreasesthen umberafter V.
Toe xitthismode ,perf ormthe"ColdReset"(resetc learingmemor y)
asdescribedbelo w.
GENERALTEST MODE
(INCLUDING AMPLIFIER ANDTUNER)
Press the REPEA T, ENTER/NEXT and CLOCK TIMER SET
buttonssim ultaneousl ywhilethemainpo werison.
1. Soundv olumedispla ysegmentstar tsb linking.
2. ThetuningentersthePRESETmode.
3. Rotatingthe VOLUMEcontr ol c loc kwiseincreasesthev olume
leveltomaxim um.
Rotatingthe VOLUMEcontr olcounter -cloc kwisedecreases
thev olumele veltominim um.
4. Pressingthe MUSIC ke y decreases theequaliz ercur veto
minim umand"EQCHECK"appear sonthedispla y.
PressingtheMO VIEkeyincreasestheequaliz er cur veto
maximum.
PressingtheGAMEke ymakestheequaliz ercur veflat.
5. Pressingan y ofthe DBFB, GROOVE orSURR OUNDke y
disappear s"EQCHECK"onthedispla y.
Toe xitthismode ,perf ormthe"ColdReset"(resetc learingmemor y)
asdescribedbelo w.
SECTION 2
TEST MODE
AGING MODE
1. CDagingmode
Toe xecutetheCDa ging, setthethreediscstotheCDtra yand
setthefunctionto CD .REPEA T,ENTER/NEXTandLOOP
buttonssim ultaneousl y.TheCDa gingmodestar tsandthedisc
calendarstartsblinking.
2. Tapea gingmode
Toe xecutethetapea ging, setthetw otapestothetapeAandB
drives. Setthefunctionto TAPE. PresstheREPEA T, ENTER/
NEXTandLOOPb uttonssim ultaneousl y.PresstheAf orwar d
keytostar tthetapea gingmode . "AGING" appear sonthe
displa y.
CD SERVICE MODE
Turnonthemainpo wer.PresstheREPEA T,ENTER/NEXTand
KARAOKEPON/MPXb uttonssim ultaneousl y.
VACStog glesbetweenONandOFF .
VACS LEVEL DISPLAY
Turnon the main po wer. Pressthe EDIT ,ENTER/NEXTand
KARAOKEPON/MPXb uttonssim ultaneousl y.
VACSle velappear sonthedispla y.
CD SHIP MODE
Turnonthe mainpo wer.Press the PLA Y MODEand PO WER
buttonssim ultaneousl y.
Themainpo weristurnedoffandLOCKappear sonthedispla y.
TUNER STEP CHANGE
Turnonthemainpo wer. Setthefunctionto TUNER. SelectMW
bandfromthepresenttuning.
Turnoffthemainpo wer. PresstheENTER/NEXTandPO WER
buttons sim ultaneousl y. Themainpo weristurnedonand the
chang edstepappear sonthedispla y.
MD/VIDEO 1 FUNCTION CHANGE
PresstheFUNCTIONandPO WERb uttonssim ultaneousl ywhile
themainpo werison. Whenthefunctionissetto VIDEO1, the
functionisc hang edtoMDandMDappear sonthedispla y.
WhenthefunctionissettoMD ,thefunctionisc hang edto VIDEO
1and VIDEO1appear sonthedispla y.
COLD RESET (Reset which clears memory.)
Press the REPEA T, ENTER/NEXT and DISPLA Y buttons
sim ultaneousl yatan ytime . Thesystemisresetwhilec learing
memor y.
HOT RESET
(Reset which does not clear memory.)
PresstheREPEA T,ENTER/NEXTand TIMERSELECTb uttons
sim ultaneousl y atan ytime . Thesystem isreset withoutc learing
memor y.
STR microprocessor version number
HCD microprocessor version number
VCD microprocessor version number (VCD model only)
Model name
Destination
3-1. CIRCUIT BOARDS LOCATION
SECTION 3
DIAGRAMS
PRI BOARD
SEC BOARD
PANEL BOARD
AVIN BOARD
JOG BOARD
VOLUME BOARD
MIC ECHO BOARD
AMP-A BOARD
MAIN BOARD
SUR BOARD
SURROUND
AMP BOARD
ENCAPSULATED
COMPONENT
— 5 — — 6 —
SUPPLY BOARD