Sony STRWX-7 Service manual
STR-WX7
SERVICE MANUAL
STR-WX7 is the tuner and amplifier
section in MHC-WX7AV.
SPECIFICATIONS
Amplifier section
The following measured at AC 120, 220, 240 V 50/60 Hz
DIN power output (Rated) (FRONT)
120 + 120W (6 Ω at 1kHz DIN)
Continuous RMS power output (Reference)
FRONT SPEAKER: 150 + 150W
(6 Ω at 1kHz, 10% THD)
CENTER SPEAKER: 60W
(8 Ω at 1kHz, 10% THD)
REAR SPEAKER: 40 + 40W
(8 Ω at 1kHz, 10% THD)
Inputs MD/VIDEO 1 IN (phono jacks): voltage
450/250mV, impedance 47kΩ
AV INPUT AUDIO (phono jacks):
voltage 250mV, impedance 47kΩ
MIX MIC (phone jack): sensitivity 1mV,
impedance 10kΩ
Output MD/VIDEO 1 OUT (phono jacks):
voltage 450/250mV, impedance 1kΩ
PHONES (stereo phone jack): accepts
headphones of 8Ω or more.
FRONT SPEAKER:
accepts impedance of 6 to 16Ω
CENTER SPEAKER:
accepts impedance of 8 to 16Ω
REAR SPEAKER:
accepts impedance of 8 to 16Ω
SUPER WOOFER:
Voltage 1V, impedance 1kΩ
Video section
Inputs AV INPUT VIDEO (phone jack): 1Vp-p,
75Ω
Outputs MONITOR OUT (phone jack): 1Vp-p,
75Ω
E Model
Australian Model
5Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range 87.5 – 108.0MHz
Antenna terminals 75Ω unbalanced
Intermediate frequency 10.7MHz
AM tuner section
Tuning range
Middle Easten models: 531 – 1,602kHz(with the MW interval set at
9kHz)
5.95 – 17.90MHz (with the SW interval set
at 5kHz)
Australian, Thai models : 531 – 1,602kHz(with the AM tuning
interval set at 9kHz)
530 – 1,710kHz (with the AM tuning
interval set at 10kHz)
Other models: MW :
531 – 1,602kHz(with the MW tuning
interval set at 9kHz)
530 – 1,710kHz (with the MW tuning
interval set at 10kHz)
SW :
5.95 – 17.90 MHz (with the SW tuning
interval set at 5kHz)
Intermediate frequency 450kHz
Antenna AM loop antenna
External antenna terminal
— Continued on next page —
MICROFILM
FM STEREO/FM-AM RECEIVER
TABLE OF CONTENTS
General
Power requirements
Australian model: 240V AC, 50/60Hz
Thailand model: 220V AC, 50/60Hz
Other models: 120V or 220V or 230 – 240, 50/60Hz
Adjustable with voltage selector
Power consumption 340W
Dimensions (w/h/d) Approx. 288 × 205 × 375mm
Mass Approx. 8.8kg
Design and specifications are subject to change without notice.
1. GENERAL ...........................................................................3
2. DISASSEMBLY
2-1. Slideng Panel Assembly ····················································· 4
2-2. Level Slider ········································································ 4
3. SERVICE MODE .............................................................. 5
4. DIAGRAMS
4-1. Circuit Boards Location ·················································· 9
4-2. Block Diagrams
• Main Section ································································ 10
• Power Section ······························································ 11
4-3. Printed Wiring Board Main Section ························· 12
4-4. Schematic Diagram Main (1/2) Section ···················· 13
4-5. Schematic Diagram Main (2/2) Section ························· 14
4-6. Schematic Diagram AV/Mic Section······························15
4-7. Printed Wiring Board AV/Mic Section ··························· 15
4-8. Schematic Diagram Power Amp Section ······················· 16
4-9. Printed Wiring Board Power Amp Section ····················· 17
4-10. Schematic Diagram Display Section ······························ 18
4-11. Printed Wiring Board Display Section ··························· 19
4-12. Schematic Diagram Sliding Panel Section ····················· 20
4-13. Printed Wiring Board Sliding Panel Section ·················· 21
4-14. Schematic Diagram Surround Section ···························22
4-15. Printed Wiring Board Surround Section·························23
4-16. Printed Wiring Board Trans Section ······························· 24
4-17. Schematic Diagram Trans Section ································· 25
4-18. IC Block Diagrams ··························································· 26
4-19. IC Pin Function ································································28
5. EXPLODED VIEWS
6-1. Case and Sliding Panel Section ........................................ 31
6-2. Front Panel Section .......................................................... 32
6-3. Slide Mechanism Section ................................................. 33
6-4. Circuit Boards and Back Panel Section............................34
7. ELECTRICAL PARTS LIST ........................................35
MODEL IDENTIFICATION
— BACK PANEL —
LABEL MODEL NUMBER
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK ! OR DO TTED 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.
2
No.
MODEL PART No.
Saudi Arabia, Singapore,
Malaysia, Australian model
4-900-848-2π
Thai model 4-900-848-3π
Front Panel
SECTION 1
GENERAL
1 2 3 4 5 6
7
#¢
#£
#™
#¡
#º
@ª
@•
@¶
@§
@∞
1 MOVIE button
2 MUSIC button
3 GAME button
4 PLACE button
5 P FILE button
6 EFFECT ON/OFF button
7 OPEN/CLOSE button
8 TUNER BAND button
9 STEREO/MONO button
!º TUNING MEMORY button
!¡ KARAOKE PON/MPX button
!™ MIC LEVEL dial
@™
@¢
@£
@¡
@º
!ª
!•
!£ MIX MIC jack
!¢ GROOVE button
!∞ VOLUME dial
!§ ) + button
!¶ ENTER/NEXT button
!• MULTI JOG STATION dial
!ª 0 – button
@º NON-STOP button
@¡ EDIT button
@™ FLASH button
@£ PLAY MODE button
@¢ REPEAT button
!¶
!§
8
9
!º
!¡
!™
!£
!∞
!¢
@∞ PHONES jack
@§ LOOP button
@¶ CLOCK/TIMER SET button
@• TIMER SELECT button
@ª FUNCTION button
#º PROLOGIC button
#¡ DSP button
#™ DBFB button
#£ DISPLAY/DEMO button
#¢ I/u (POWER) button
Rear Panel
7
1
2
3
4
5
6
1 SYSTEM CONTROL jack
2 ANTENNA terminal
3 CENTER SPEAKER terminal
4 REAR SPEAKER terminal
5 MONITOR OUT jack
6 FRONT SPEAKER terminal
7 MD/VIDEO 1 jack
3
SECTION 2
DISASSEMBLY
Note: Follow the disassembly procedure in the numerical order given.
2-1. SLIDING PANEL ASSEMBLY
4
Flat type cable (19 core)
Slide mechanism
1
Push the OPEN/CLOSE button to
open the Sliding panel assembly.
5
Sliding panel assembly
2-2. LEVEL SLIDER
4
Four screw
(BVTP2.6x8)
1
Screw (BVTP2.6x8)
a
b
3
Top bracket
2
Screw
(BVTP2.6x8)
2
Screw (BVTP 3x8)
3
Holder level
8
Remove the Level slider direction of arrow.
5
Holder (L) assembly
NOTE FOR INSTALLATION :
Attach in the reverse order, but make sure the rollers (a, b) of the
holder (L) assembly and holder (R) assembly fit into the grooves of
the level slider.
4
b
7
Holder (R) assembly
a
6
Four screw (BVTP2.6x8)
SECTION 3
SER VICE MODE
Connections and Operations When Used Alone
Normally, use the unit connected to the HTC-WX5 as follows.
Basically, when servicing the unit, connect the unit as follows.
UNIT
SYSTEM CONTROL 17P
AC IN
Even when not connected to the HTC-WX5, the unit can operate alone as it mounts a power supply (some functions will however not be
available).
MC Cold Reset
• The cold reset clears all data including preset data stored in the RAM to initial conditions. Execute this mode when returning the set to the
customer.
Procedure:
1. Press three buttons EDIT , ENTER/NEXT , and DISPLAY/DEMO simultaneously.
2. The fluorescent indicator tube becomes blink instantaneously, and the set is reset.
CD Delivery Mode (This mode can be used only when the HTC-WX5 is connected.)
• This mode moves the pick-up to the position durable to vibration. Use this mode when returning the set to the customer after repair.
Procedure:
1. Press 1/u button to turn the set ON.
2. Press LOOP button and 1/u button simultaneously.
3. A message “LOCK” is displayed on the fluorescent indicator tube, and the CD delivery mode is set.
MC Hot Reset
• This mode resets the set with the preset data kept stored in the memory. The hot reset mode functions same as if the po wer cord is plugged
in and out.
Procedure:
1. Press three buttons REPEAT , ENTER/NEXT , and DISPLAY/DEMO simultaneously.
2. The fluorescent indicator tube becomes blink instantaneously, and the set is reset.
HTC-WX5
Sled Servo Mode (This mode can be used only when the HTC-WX5 is connected.)
• This mode can run the CD sled motor freely. Use this mode, for instance, when cleaning the pick-up.
Procedure:
1. Select the function “CD”.
2. Press three buttons FLASH , ENTER/NEXT , and KARAOKE PON/MIX simultaneously.
3. The Sled Servo mode is selected, if “CD” is blinking on the fluorescent indicator tube.
4. With the CD in stop status, press ) + button move the pick-up to outside track, or – 0 button to inside track.
5. To exit from this mode, perform as follows:
1) Move the pick-up to the most inside track.
2) Press three buttons in the same manner as step 2.
Note:
• Always move the pick-up to most inside track when exiting from this mode. Otherwise, a disc will not be unloaded.
• Do not run the sled motor excessively, otherwise the gear can be chipped.
Change-over of FUNCTION Name
• The FUNCTION name of external input terminal can be changed over to VIDEO 1 or MD. W ith the FUNCTION selected to “MD”, about
5dB mute is applied to the input gain.
Procedure:
1. Press 1/u button to turn the set OFF.
2. Press 1/u button together with FUNCTION b utton, and the power is turned on, the display of fluorescent indicator tube changes to
“MD” or “VIDEO 1” instantaneously, and thus the FUNCTION is changed over.
Change-over of AM Tuner Step between 9kHz and 10kHz
• A step of AM channels can be changed over between 9kHz and 10kHz.
Procedure:
1. Press 1/u button to turn the set ON.
2. Select the function “TUNER”, and press TUNER BAND button to select the BAND “MW”.
3. Press 1/u button to turn the set OFF.
4. Press ENTER/NEXT and 1/u buttons simultaneously, and the display of fluorescent indicator tube changes to “MW step 10” or
“MW step 9”, and thus the channel step is changed over.
5
LED and Fluorescent Indicator Tube All Lit, Key Check Mode (Do not connect the HTC-WX5.)
Procedure:
1. Press 1/u button to turn the set ON.
2. Press the OPEN/CLOSE button to open the sliding panel.
3. Press three buttons PROLOGIC , ENTER/NEXT , and DISPLAY/DEMO simultaneously.
4. LEDs and fluorescent indicator tube are all turned on. Each time the MO VIE b utton is pressed, the fluor escent indicator tube lights up
as follows:
lights up completely n lights up partially 1 n lights up partially 2 n lights up completely.
5. Press GAME button, and the key check mode is activated.
6. In the key check mode, the fluorescent indicator tube displays “K @@ J0 V0”. Each time a button is pressed, “K”value decreases.
However, once a button is pressed, it is no longer taken into account. (@@ means the total of buttons)
“J” Value increases like 1, 2, 3 ... if rotating JOG knob in “+” direction, or it decreases like 0, 9, 8 ... if rotating in “-” direction.
“V” Value increases like 1, 2, 3 ... if rotating VOLUME knob in “+” direction, or it decreases like 0, 9, 8 ... if rotating in “-” direction.
7. Pressing all buttons lights up the fluorescent indicator tube completely.
8. To exit from this mode, press three buttons EDIT , ENTER/NEXT and DISPLAY/DEMO simultaneously. (COLD RESET)
9. To exit from this mode, press three buttons in the same manner as step 1, or disconnect the power cord.
CD, TAPE Deck Aging Mode (This mode can be used only when the HTC-WX5 is connected.)
This mode can be used for checking the operations of the CD player and tape deck.
• When problems occur;
Aging stops, and the stopped state is displayed on the fluorescent indicator tube.
• When no problems;
Aging continues.
Preparations:
• Set the CD on the DISC1 tray.
• Insert a commercially available tape for recording (tapes which contents can be erased, etc.) in decks A and B.
Setting the aging mode:
Press the PLAY MODE button, ENTER/NEXT button, and STEREO/MONO button together.
When the aging mode is set, the CD roulette mark blinks. To exit the mode, press the 1/u button and turn OFF the power.
Sequence:
The aging mode is executed in the following sequence.
If the function is set to “CD” when the aging mode is set, aging is performed starting from the CD player . When set to “TAPE A” or “TAPE
B”, aging is started from deck A.
If the function is set to others, aging will not be started until the function is switched to CD or TAPE.
Aging of CD player (12 minutes)
Aging of deck A
Aging of deck B
Aging of deck A
10 minutes
(half)
Display of status:
• The aging status is displayed on the fluorescent indicator tube.
• Normally, the CD player displays the remaining aging time. But if operations ended abnormally, it displays the cause.
• During the aging of the tape deck, the operations performed will be displayed. If operations ended abnormally, this will be displayed at the
fluorescent display tube.
CD Player
• During normal operations:
Display of fluorescent indicator tube
**1-@@
**: Displays “CD” and the remaining aging time (minutes) alternately. The remaining aging time is counted down from 12.
@@: Track number being accessed.
6
• When operations end abnormally:
Display of fluorescent display tube
Display
NO DISC ERR
FOCUS1 ERR
FOCUS2 ERR
GFS ERR
FBIAS ERR
SENSOR ERR
TABLE ERR
TRAY ERR
Tape Deck
Display of Operations
T APE A AG-1
T APE A AG-2
T APE A AG-3
T APE A AG-4
T APE A AG-5
TAPE B AG-1
TAPE B AG-2
TAPE B AG-3
TAPE B AG-4
TAPE B AG-5
Main Cause
DISC 1 is NO DISC from the beginning
Focus is not imposed properly
The focus deviated sev eral times after the disc rotated normally
GFS ERROR
Error during focus bias adjustment
DISC 1 was found to be NO DISC by the disc sensor
The table did not rotate normally
The tray containing the BD did not operate normally
Operation
T APE A, B REW
T APE A FWD
T APE A FF
T APE A REV
T APE A REW
TAPE B REW
TAPE B FWD
TAPE B FF
TAPE B REV
TAPE B REW
Shutoff
100 seconds playback
20 seconds or shutoff
100 seconds playback
Shutoff
Shutoff
100 seconds playback
20 seconds or shutoff
100 seconds playback
Shutoff
Timing of Ending
Operations during aging
• Operations are performed in the following sequence during aging.
<CD player>
1. The CD tray rotates and disc 1 is selected.
2. Chucking is performed.
3. TOC is read.
4. Track 1 played back for 2 seconds.
5. The last track is played back for 2 seconds.
6. 1 to 5 is repeated.
7. After 12 minutes of aging, aging is switched to the tape deck.
<Tape Deck>
1. The tape in deck A and B are rewound to the head at the same time.
2. The FWD side is played back for 100 seconds.
3. The tape is fast forwarded (FF) for 20 seconds. The following procedure is performed when the tape end is reached before the 20
seconds.
4. The REV side is played back for 100 seconds.
5. The tape is rewound to the head (REW).
6. The FWD side is played back for 100 seconds.
7. The tape is fast forwarded (FF) for 20 seconds. The following procedure is performed when the tape end is reached before the 20
seconds.
8. The REV side is played back for 100 seconds.
9. The tape is rewound to the head (REW).
10. The tape in deck A is rewound to the head.
11. The FWD side is played back for 100 seconds.
12. The tape is fast forwarded (FF) for 20 seconds.
The following procedure is performed when the end is reached before the 20 seconds.
13. Aging is switched to the CD player.
7
PANEL Aging Mode
This mode is used for opening and closing the sliding panel continuously.
Setting the aging mode :
With the set at standby condition, press FLASH button, ENTER/NEXT button and STEREO/MONO button together.
The aging will start and sliding panel will follow aging sequence as described below.
• When problems occur ;
Aging stops and “AGING ERROR” is displayed on the fluorescent indicator tube.
• When no problems;
Aging is carried out repeatedly. After 65000 times, “AGING STOP” is displayed and aging stops.
Aging Sequence
Stops for one second in the opened state
Panel open Panel close
n
Counts up
n n
Stops for one second in the closed state
Each time the DISPLAY/DEMO button is pressed, the display switches as follows.
AGING @@@@@ (No. of agings carried out)
OP MAX @.@@ (Maximum time taken for OPEN:In seconds)
OP MIN @.@@ (Minimum time taken for OPEN:In seconds)
CL MAX @.@@ (Maximum time taken for CLOSE:In seconds)
CL MIN @.@@ (Minimum time taken for CLOSE:In seconds)
8
SECTION 4
d
d
DIAGRAMS
STR-WX7
4-1. CIRCUIT BOARDS LOCATION
SECONDARY board
CONNECTOR board
HEADPHONE board
LOADING PANEL board
MOTOR board
PRIMARY board
POWER AMP board
MIC / ECHO board
ENCAPSULATED COMPONENT
SURR SPK boar
SURR AMP board
THIS NOTE IS COMMON FOR PRINTED WIRING
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed
in each block.)
For schematic diagrams.
Note:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ω and 1/
specified.
¢
•
• 2 : nonflammable resistor.
• 1 : fusible resistor.
• C : panel designation.
Note: The components identified by mark ! or dotted line
• U : B+ Line.
• V : B– Line.
• H : adjustment for repair.
• Voltages and waveforms are dc with respect to ground
• V oltages are taken with a V OM (Input impedance 10 MΩ).
• Waveforms are taken with a oscilloscope.
• Circled numbers refer to waveforms.
• Signal path.
• Abbreviation
: internal component.
with mark ! are critical for safety.
Replace only with part number specified.
under no-signal (detuned) conditions.
Voltage variations may be noted due to normal produc-
tion tolerances.
Voltage variations may be noted due to normal produc-
tion tolerances.
F : FM
f : AM
L : AUDIO (AV INPUT)
g : MD/VIDEO
i : VIDEO (AV INPUT)
E : PB (DECK A)
G : REC (DECK B)
J : CD
EA : Saudi Arabia model.
SP : Singapore model.
MY : Malaysia model.
AUS : Australian model.
TH : Thai model.
4
W or less unless otherwise
For printed wiring boards.
Note:
• X : parts extracted from the component side.
• Y : parts extracted from the conductor side.
• p : parts mounted on the conductor side.
®
•
•
• b : Pattern from the side which enables seeing.
: Through hole.
¢
: internal component.
• Indication of transistor
C
Q
These are omitte
EB
C
EB
These are omitted
FRONT AV board
PANEL board
DETECTOR board
MAIN board
• Abbreviation
EA : Saudi Arabia
SP : Singapore
MY : Malaysia
AUS : A ustralian
TH : Thai
• Wavef orm
DISPLAY Section
1
5.3Vp-p
5MHz
IC501 0 X2
2
5Vp-p
32.768kHz
IC501 !£ XT2
99
STR-WX7
4-2. BLOCK DIAGRAM
MAIN SECTIOAN
1
2
7
9
5
6
14
16
17
13
VIDEO
AUDIO L
IN L
OUT L
COM DIN
COM DATA
COM CLK
STEREO
TUNED
POWER ON/OFF
AC1
AC2
VF1
VF2
J6301
AV INPUT
(VIDEO 2)
VIDEO 1
FM/AM TUNER
TUNER UNIT IS
SUPPLIED AS
THE ASSEMBLED
BLOCK
B
POWER
SECTION
(Page 12)
16
J101
MD/
CN101
SYSTEM
CONTROL
TO
HTC-WX5
ST L
ST CE
MUTE
IIC DATA
IIC CLK
AC1
AC2
R-CH(CD R)
R-CH(PB R)
R-CH(REC R)
KEY
MATRIX
MULTI JOG
STATION
S653
VOLUME
S652
SLIDING
SENSOR
IC504,Q513
REMOTE
SENSOR
IC503
AV SWITCH
Q6301
R-CH
VIDEO
EQ
IC111(1/2)
TU
69
CD
68
V2
67
TC
66
MD/V1
65
SELECT
SWITCH
15
4
22
SPEANA CONT
SPEANA0
26
SPEANA1
27
I2C DATA
55
56
I2C CLK
92
DATA OUT
90
DATA IN
89
LAT
93
CLK
ST MUTE
86
STREO
87
88
TUNED
41
AV IN
POWER ON/OFF
94
28
KEY0
I
I
31
KEY3
JOG A
20
21
JOG B
VOL A
18
VOL B
19
SENSOR IN
42
SIRCS IN
43
X501
5MHz
SPEANA
SELECTOR
IC505
Y
Z
9
X2 X1
10 11
R-CH
Y1
1
Y2
2
Z1
3
Z2
5
10
MASTER CONTROL
2
25
IC501
VA CS
XT2 XT1
13 14
EQ
AMP
SPEANA
BPF FILTER
IC506
f1
17
16
f2
15 f3
14 f4
13 f
GEQ DATA
GEQ CLK
GEQ LAT
PROLOGIC LAT2
PROLOGIC LAT1
PROLOGIC CLK
PROLOGIC DATA
DBFB B2
DBFB B1
TA MUTE
PROLOGIC RLY
FL DATA
FL CLK
FL LAT
FL RESET
RESET
ACCUT
MOTOR 1
MOTOR 2
PANEL OPEN
PANEL CLOSE
X502
32kHz
42 41
4
59
60
57
58
DOLBY PRO-LOGIC
IC300
L IN
LINE
IN
LED
100
61
R-CH
4
49 50 54 51 5352
1
96
2
97
3
95
99
98
1
5
6
7
50
I
54
.
57
.
67
.
70
.
72
.
73
4
DATA
35
CLK
36
LAT
37
RST
38
15
32
82
83
84
85
D504
5
6
MUTE
SWITCH
Q121
LED
ON/OFF
SWITCH
Q502-512,
Q531-535,
Q538-540
RESET
SWITCH
Q501
IC891
MOTOR
DRIVER
PANEL
OPEN/CLOSE
S892
PANEL
2
10
ENABLE2
ENABLE
LED
L OUT
S OP OUT
C OP OUT
CLK DATA
RESET
IC502
M
OSC2
OSC1
PANEL
MOTOR
M891
24
33
31
47
X301
8MHz
46
D507
+5.6V
VOLUME
IC111(2/2)
MICON
INTERFACE
33
32 34
123
AMP
IC361
5
3
MIC AMP
IC6001(2/2)
76
3
L-CH
S/W
MUTE
L+R
TA MUTE
S OUT
C OUT
PROLOGIC
RLY
C
POWER
SECTION
(Page 12)
J6001
MIX
MIC
36
57
40
AMP
IC113(2/2)
DISPLAY CONTROL
IC601
G0
16
DATA
CLK
15
CS
14
RESET
13
G15
S0
S35
SELECTOR
12
I
1
64
I
61
59
I
33
31
I
23
MUTE
Q361,371
DATA
CLK
LAT
RST
R-CH
38
39
7
1
DBFB
IC112
FLUORESCENT
INDICATOR
MUTE
Q183
FL601
TUBE
SW
Q132
DET
D131
MIC AMP
IC6001(1/2)
1
RV6001(1/2)
MIC LEVEL
• R CH: Same as L ch
• SIGNAL PATH
: FM
: AUDIO(AV INPUT)
: MD/VIDEO
: VIDEO
: PB
: VIDEO(AV INPUT)
: REC
: CD
1010
POWER SECTIOAN
VIDEO
S/W
C OUT
POWER AMP
IC4001(1/2)
1
POWER AMP
IC4001(2/2)
10
OVER LOAD
DET
Q4002
RY781
RY741
J781
MONITOR
OUT
SUPER
WOOFER
SPEAKER
STR-WX7
TB201
CENTER
C
MAIN
SECTION
(Page 11)
B
MAIN
SECTION
(Page 11)
16
S OUT
L+R
L-CH
TA MUTE
MUTE
PROLOGIC RLY
POWER ON/OFF
AC1
AC2
VF1
VF2
MUTE
Q181
D852,853
18
POWER AMP
IC901
20
8
MUTE
SWITCH
Q901
POWER ON
MUTE
Q852
13
OVER LOAD
15
OVER LOAD
OVER HEAD
Q971, 972
DET
Q4052
DET
Q952
DET
OVER LOAD
SWITCH
Q851
R-CH
1
4
R-CH
R-CH
2
PROTECTOR
PROTECTOR
IC851
VCC ON
MUTE
7
SWITCH
Q853
Q741
RY751
L
R-CH
D761
D751
6
Q854
Q855
D746
M901
FAN
MOTOR
ST+10V
UNREG
+12V
+7V
+5.6V
+5V
-7V
SURR +B
SURR -B
REAR
SPEAKER
R
TB751
FRONT
L
SPEAKER
R-CH
ST+10V
3 1
REG
IC804
D821
+7V REG
IC801
+5.6V REG
IC803
REG
Q731,732
-7V REG
IC802
VG REG
Q801
1
1
2
3
3
D813
M
+B
-B
VG
FAN MOTOR
3
RECT
D810,811
T901
POWER
TRANSFORMER
+
RECT
D805-808
–
+
RECT
D809
–
+
RECT
D801
–
RECT
D802, 803
AC1
AC2
VF1
VF2
J755
PHONES
AC
IN
VOLTAGE
SELECTOR
S871
EA,SP,MY
• R CH : Same as L ch
• SIGNAL PATH
: FM
:VIDEO (AV INPUT)
• Abbreviation
: Saudi Arabia model.
EA
: Singapore model.
SP
: Malaysia model.
MY
1111
STR-WX7
4-3. PRINTED WIRING BOARD MAIN SECTION
(Page 19)
• Semiconductor
Location
Ref. No. Location
D101 B-11
D102 A-11
D131 E-9
D742 F-7
D743 F-10
D746 F-10
D751 E-11
D752 E-10
D761 E-12
D781 G-10
D801 E-4
D802 D-4
D803 D-4
D804 C-2
D805 F-4
D806 F-4
D807 F-4
D808 F-4
D810 D-4
D811 D-4
D812 B-2
D813 A-2
D821 G-5
D851 F-8
D852 G-8
D853 G-8
(Page 24)
• Refer to page 9 for Circuit Boards Location.
(Page 17)(Page 23)
(Page 15)
(Page 15)
MD/VIDEO1
MD/VIDEO1
IC111 B-10
IC112 D-10
IC113 D-9
IC300 A-7
IC361 A-5
IC801 A-2
IC802 C-3
IC803 B-2
IC804 C-4
IC851 G-9
Q121 A-2
Q132 D-10
Q182 D-11
Q183 E-8
Q361 B-4
Q371 A-4
Q731 F-11
Q732 F-10
Q741 F-9
Q801 C-2
Q851 F-9
Q852 G-8
Q853 G-8
Q854 G-7
Q855 G-6
(Page 17)
BB
JW254
(Page 15) (Page 23)(Page 21)(Page 21)
1212
STR-WX7
4-4. SCHEMATIC DIAGRAM MAIN(1/2) SECTION
5.1
5.1
5.1
L301
100µH
5.1
0
10.1
2.6
5
5.1
5.1
2.6
5.1
5.1
5
2.6
5.1
2.6
5.1
5.1
5.1
5.1
5.1
5
5.1
0.7
1.9
2.6
• Refer to page 26 for IC Block Diagrams.
5.1
5.1
5.1
5.1
5
5.1
5.1
10.1
5
5.1
5.1
0
5.1
5.1
5.7
5.1
5.8
3.5
3.4
3.4
5
5
5
5.7
5.1
5.7
5.1
5.1
22
15
5
5.1
5.1
5.1
5.1
5
2.2
2.5
5.2
55555
5.1
0.1
5
5.1
5.1
5.1
5.1
5.1
PRO-LOG LAT
PRO-LOG LAT2
PRO-LOG DATA
PRO-LOG CLK
PRO-LOG RLY
2.7k
2.7k
18
(Page 14) (Page 14) (Page 14) (Page 14)
1313
STR-WX7
(Page 13) (Page 13) (Page 13) (Page 13)
20
25
15
20
16
16
22
16
8
OVER CURRENT
0.8
0.1
Q854
2SA124ES
Q855
2SC2958L
RELAY SWITCH
R857
22k
0
2SC2958-L
4-5. SCHEMATIC DIARGAM MAIN(2/2) SECTION
• Refer to page 12 for Printed Wiring Board. • Refer to page 26 for IC Block Diagrams.
The components identified by mark ! or dotted
line with mark ! are critical for safety.
Replace only with part number specified.
1414
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