Sony STR-WX7 Service Manual
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Sony STR-WX7 Service Manual

Sony STR-WX7 Service Manual

Fm stereo/fm-am receiver
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SERVICE MANUAL

STR-WX7 is the tuner and amplifier
section in MHC-WX7AV.
Amplifier section
The following measured at AC 120, 220, 240 V 50/60 Hz
DIN power output (Rated) (FRONT)
Continuous RMS power output (Reference)
Inputs
Output
Video section
Inputs
Outputs
MICROFILM
SPECIFICATIONS
120 + 120W (6 Ω at 1kHz DIN)
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)
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
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
AV INPUT VIDEO (phone jack): 1Vp-p,
75Ω
MONITOR OUT (phone jack): 1Vp-p,
75Ω
STR-WX7
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
FM STEREO/FM-AM RECEIVER
E Model
— Continued on next page —

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  • Page 1: Service Manual

    STR-WX7 SERVICE MANUAL E Model Australian Model STR-WX7 is the tuner and amplifier section in MHC-WX7AV. SPECIFICATIONS Amplifier section 5Tuner section The following measured at AC 120, 220, 240 V 50/60 Hz FM stereo, FM/AM superheterodyne tuner DIN power output (Rated) (FRONT) 120 + 120W (6 Ω...

  • Page 2: Table Of Contents

    MARK ! ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS Saudi Arabia, Singapore, LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE 4-900-848-2π COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS Malaysia, Australian model APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS Thai model 4-900-848-3π...

  • Page 3: General

    SECTION 1 GENERAL Front Panel 1 2 3 4 5 #¢ #£ #™ !º #¡ #º @ª !¡ @• !™ @¶ @§ !£ @∞ @¢ @£ @™ @¡ @º !ª !• !¶!§ !∞ !¢ 1 MOVIE button !£ MIX MIC jack @∞...

  • Page 4: Disassembly

    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. 2 Screw (BVTP 3x8) 5 Sliding panel assembly 3 Holder level 2-2.

  • Page 5: Service Mode

    SECTION 3 SERVICE 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. HTC-WX5 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).
  • Page 6 LED and Fluorescent Indicator Tube All Lit, Key Check Mode (Do not connect the HTC-WX5.) Procedure: Press 1/u button to turn the set ON. Press the OPEN/CLOSE button to open the sliding panel. Press three buttons PROLOGIC , ENTER/NEXT , and DISPLAY/DEMO simultaneously. LEDs and fluorescent indicator tube are all turned on.
  • Page 7 • When operations end abnormally: Display of fluorescent display tube Display Main Cause NO DISC ERR DISC 1 is NO DISC from the beginning FOCUS1 ERR Focus is not imposed properly FOCUS2 ERR The focus deviated several times after the disc rotated normally GFS ERR GFS ERROR FBIAS ERR...
  • Page 8 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. •...

  • Page 9: Diagrams

    STR-WX7 SECTION 4 DIAGRAMS 4-1. CIRCUIT BOARDS LOCATION THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS. (In addition to this, the necessary note is printed in each block.) PRIMARY board For schematic diagrams. For printed wiring boards.

  • Page 10: Block Diagrams

    STR-WX7 4-2. BLOCK DIAGRAM MAIN SECTIOAN VIDEO VOLUME IC111(1/2) IC111(2/2) L-CH R-CH(CD R) SELECT MUTE SWITCH MICON MD/V1 R-CH(PB R) Q183 INTERFACE CN101 R-CH POWER IC113(2/2) SYSTEM R-CH MUTE SECTION CONTROL 32 34 (Page 12) R-CH(REC R) HTC-WX5 DBFB SELECTOR...

  • Page 11: Main Section

    STR-WX7 POWER SECTIOAN RY781 J781 MONITOR VIDEO SUPER WOOFER POWER AMP IC4001(1/2) TB201 RY741 C OUT CENTER SPEAKER OVER LOAD Q4002 POWER AMP IC4001(2/2) S OUT R-CH D746 REAR OVER LOAD SPEAKER R-CH Q4052 D761 Q741 MAIN SECTION (Page 11)

  • Page 12: Printed Wiring Board

    STR-WX7 4-3. PRINTED WIRING BOARD MAIN SECTION • Refer to page 9 for Circuit Boards Location. (Page 23) (Page 17) (Page 15) (Page 15) (Page 19) • Semiconductor Location Ref. No. Location D101 B-11 D102 A-11 D131 D742 D743 F-10...

  • Page 13: Schematic Diagram Main(1/2) Section

    STR-WX7 4-4. SCHEMATIC DIAGRAM MAIN(1/2) SECTION • Refer to page 26 for IC Block Diagrams. L301 100µH 10.1 PRO-LOG LAT PRO-LOG LAT2 PRO-LOG DATA PRO-LOG CLK PRO-LOG RLY 2.7k 2.7k (Page 14) (Page 14) (Page 14) (Page 14)

  • Page 14: Schematic Diagram Main (2/2) Section

    STR-WX7 4-5. SCHEMATIC DIARGAM MAIN(2/2) SECTION • Refer to page 12 for Printed Wiring Board. • Refer to page 26 for IC Block Diagrams. (Page 13) (Page 13) (Page 13) (Page 13) OVER CURRENT 2SC2958-L Q854 2SA124ES R857 Q855 2SC2958L...

  • Page 15: Schematic Diagram Av/Mic Section

    STR-WX7 4-6. SCHEMATIC DIAGRAM AV/MIC SECTION 4-7. PRINTED WIRING BOARD AV/MIC SECTION • Refer to page 9 for Circuit Boards Location.

  • Page 16: Schematic Diagram Power Amp Section

    STR-WX7 4-8. SCHEMATIC DIAGRAM POWER AMP SECTION The components identified by mark ! or dotted line with mark ! are critical for safety. Replace only with part number specified.

  • Page 17: Printed Wiring Board Power Amp Section

    STR-WX7 4-9. PRINTED WIRING BOARD POWER AMP SECTION • Refer to page 9 for Circuit Boards Location. (Page 23) (Page 24)

  • Page 18: Schematic Diagram Display Section

    STR-WX7 4-10. SCHEMATIC DIAGRAM DISPLAY SECTION • Refer to page 27 for IC Block Diagrams. • Refer to page 28 for IC Pin Function. TH MODEL EXCEPT MODEL...

  • Page 19: Printed Wiring Board Display Section

    STR-WX7 4-11. PRINTED WIRING BOARD DISPLAY SECTION • Refer to page 9 for Circuit Boards Location. • Semiconductor Location Ref. No. Location D501 D502 D504 D505 D506 D507 D509 D511 D512 D513 D514 D515 D516 D517 D518 D519 D520 D521...

  • Page 20: Schematic Diagram Sliding Panel Section

    STR-WX7 4-12. SCHEMATIC DIAGRAM SLIDING PANEL SECTION • Refer to page 27 for IC Block Diagrams. PROLOGIC PROLOGIC...

  • Page 21: Printed Wiring Board Sliding Panel Section

    STR-WX7 4-13. PRINTED WIRING BOARD SLIDING PANEL SECTION • Refer to page 9 for Circuit Boards Location. PROLOGIC...

  • Page 22: Schematic Diagram Surround Section

    STR-WX7 4-14. SCHEMATIC DIAGRAM SURROUND AMP SECTION The components identified by mark ! or dotted line with mark ! are critical for safety. Replace only with part number specified.

  • Page 23: Printed Wiring Board Surround Section

    STR-WX7 4-15. PRINTED WIRING BOARD SURROUND AMP SECTION • Refer to page 9 for Circuit Boards Location. (Page 17) (Page 12) (Page 12)

  • Page 24: Printed Wiring Board Trans Section

    STR-WX7 • Refer to page 9 for Circuit Boards Location. 4-16. PRINTED WIRING BOARD TRANS SECTION...

  • Page 25: Schematic Diagram Trans Section

    STR-WX7 4-17. SCHEMATIC DIAGRAM TRANS SECTION The components identified by mark ! or dotted line with mark ! are critical for safety. Replace only with part number specified.

  • Page 26: Ic Block Diagrams

    4-18. IC BLOCK DIAGRAMS • MAIN (1/2) SECTION IC401 M65850P IC402 MC14053BCP B.COM OPEN A.COM OSCILLATOR LPF2 C.COM 1/2 VCC OPEN CLOCK AUTO MAIN 20KBIT RESET RESET CONTROL SRAM OPEN LPF1 • MAIN (2/2) SECTION IC112 MC14052BCP 2XCOM XCOM IC851 uPC1237HA OVER LOAD DET MUTE OFFSET DET...
  • Page 27 • DISPLAY SECTION IC505 MC14053BCP B.COM OPEN A.COM C.COM OPEN OPEN IC506 BA3833F RESET 18 RESET RESET REFFERENCE PREF 17 f01 CURRENT LINE 16 f02 LINE 15 f03 BIAS 13 f Bias 12 VCC 11 NC 10 NC • SLIDING PANEL SECTION IC891 LB1641 T.S.D O.C.P...

  • Page 28: Ic Pin Function

    4-19. IC PIN FUNCTION • IC501 SYSTEM CONTROL (uPD780016AYGF-012-3BA) PANEL BOARD Pin No. Pin Name Description Not used LEVEL A Surround level A signal output LEVEL B Surround level B signal output PROLOGIC RLY Not used DBFB B2 DBFB level 2 signal output DBFB B1 DBFB level 1 signal output TA MUTE...
  • Page 29 Pin No. Pin Name Description AV IN AV INPUT (VIDEO 2) switch input SENSOR IN Sliding (panel) sensor signal input SIRCS IN Remote sensor signal input SPEANE RST Spectrum analyzer reset output — — Ground — — SOFT Soft test terminal Audio indicator output MOVIE A MOVIE G...
  • Page 30 Pin No. Pin Name Description — Ground MOTOR1 Panel motor control output MOTOR2 PANEL OPEN Panel open switch output PANEL CLOSE Panel close switch output ST. MUTE ST mute signal output STEREO Stereo detection input for tuner TUNED Tuner detection input for tuner Tuner PLL latch output DATA IN Tuner PLL data input...

  • Page 31: Exploded Views

    SECTION 5 EXPLODED VIEWS NOTE: • -XX, -X mean standardized parts, so they may • Abbreviation • The mechanical parts with no reference have some differences from the original one. number in the exploded views are not : Saudi Arabia •...

  • Page 32: Front Panel Section

    X-4951-665-1 ESCUTCHEON (L) ASSY * 62 4-932-810-11 CUSHION (FL) X-4949-994-1 ESCUTCHEON (EQ) ASSY * 63 4-900-849-01 HOLDER (FL) 4-962-708-11 EMBLEM (4-A), SONY * 64 1-669-957-11 FRONT AV BOARD 4-951-620-01 SCREW (2.6 × 8), +BVTP * 65 4-210-042-01 BRACKET (SENSOR) * 59...

  • Page 33: Slide Mechanism Section

    6-3. SLIDE MECHANISM SECTION M891 Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks 4-900-844-01 LEVEL SLIDER 4-900-864-01 BRACKET TOP 4-951-620-01 SCREW (2.6 × 8), +BVTP 4-900-847-01 GEAR (2) X-4950-394-2 HOLDER (L) ASSY 3-344-059-01 BELT (L) X-4950-395-2 HOLDER (R) ASSY * 111 1-669-965-11 MOTOR BOARD 4-900-845-01 BRACKET SLIDER...

  • Page 34: Circuit Boards And Back Panel Section

    6-4. CIRCUIT BOARDS AND BACK PANEL SECTION (EA, SP, MY, AUS) (EA, SP, MY) (AUS) (TH) not supplied T901 M901 not supplied Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks * 151 A-4419-955-A MAIN BOARD, COMPLETE (EA, SP, MY, AUS) 4-970-381-11 FOOT (REAR) * 151 A-4426-816-A MAIN BOARD, COMPLETE (TH)

  • Page 35: Electrical Parts List

    CONNECTOR DETECTOR SECTION 6 ELECTRICAL PARTS LIST FRONT AV HEADPHONE LOADING PANEL NOTE: • Due to standardization, replacements in the • RESISTORS • SEMICONDUCTORS parts list may be different from the parts All resistors are in ohms. In each case, u: µ, for example: specified in the diagrams or the components METAL: metal-film resistor uA...: µA...
  • Page 36 LOADING PANEL MAIN Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks < TRANSISTOR > S636 1-762-378-11 SWITCH, TACTILE (CD REPEAT) S637 1-762-378-11 SWITCH, TACTILE (FLASH) Q531 8-729-900-80 TRANSISTOR DTC114ES S638 1-762-378-11 SWITCH, TACTILE (DSP REVERB) Q532 8-729-900-80 TRANSISTOR DTC114ES S639 1-762-378-11 SWITCH, TACTILE (CD PLAY MODE)
  • Page 37 MAIN Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks C172 1-162-291-31 CERAMIC 560PF C348 1-136-165-00 FILM 0.1uF C173 1-136-165-00 FILM 0.1uF C349 1-136-165-00 FILM 0.1uF C174 1-136-165-00 FILM 0.1uF C350 1-164-159-11 CERAMIC 0.1uF C175 1-136-495-11 FILM 0.068uF C351 1-164-159-11 CERAMIC...
  • Page 38 MAIN Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks < DIODE > Q851 8-729-900-63 TRANSISTOR DTA124ES Q852 8-729-900-36 TRANSISTOR DTC124ES D101 8-719-911-19 DIODE 1SS119 Q853 8-729-900-36 TRANSISTOR DTC124ES D102 8-719-911-19 DIODE 1SS119 Q854 8-729-900-63 TRANSISTOR DTA124ES D131 8-719-911-19 DIODE 1SS119 Q855...
  • Page 39 MIC/ECHO MAIN Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks R307 1-249-433-11 CARBON 1/4W R853 1-249-429-11 CARBON 1/4W R308 1-249-433-11 CARBON 1/4W R854 1-249-397-11 CARBON 1/4W F R310 1-247-903-00 CARBON 1/4W R855 1-249-441-11 CARBON 100K 1/4W R340 1-247-843-11 CARBON 3.3K...
  • Page 40 MIC/ECHO MOTOR PANEL Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks R6008 1-249-429-11 CARBON 1/4W C521 1-162-306-11 CERAMIC 0.01uF R6009 1-247-885-00 CARBON 180K 1/4W C522 1-126-157-11 ELECT 10uF R6010 1-247-807-31 CARBON 1/4W C523 1-126-157-11 ELECT 10uF C601 1-126-157-11 ELECT 10uF...
  • Page 41 PANEL Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks < IC > R537 1-247-807-31 CARBON 1/4W R538 1-247-807-31 CARBON 1/4W IC501 8-759-525-50 IC uPD780016AYGF-012-3BA R539 1-247-807-31 CARBON 1/4W IC502 8-759-165-82 IC PST600E-T R540 1-247-807-31 CARBON 1/4W IC503 8-749-011-22 IC GP1U27X R541...
  • Page 42 PANEL POWER AMP Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks R598 1-249-403-11 CARBON 1/4W F A-4419-957-A POWER AMP BOARD, COMPLETE (EXCEPT TH) R599 1-249-403-11 CARBON 1/4W F *************************** R600 1-249-403-11 CARBON 1/4W F A-4426-819-A POWER AMP BOARD, COMPLETE (TH) R601 1-249-403-11 CARBON 1/4W F...
  • Page 43 POWER AMP PRIMARY SECONDARY SURR AMP Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks < RESISTOR > 1-669-953-11 PRIMARY BOARD ************** R133 1-249-425-11 CARBON 4.7K 1/4W F R134 1-249-437-11 CARBPN 1/4W F 1-533-293-11 FUSE HOLDER R183 1-249-425-11 CARBON 4.7K 1/4W F...
  • Page 44 STR-WX7 SURR AMP SURR SPK Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks C4053 1-162-282-31 CERAMIC 100PF 1-669-963-11 SURR SPK BOARD C4054 1-126-964-11 ELECT 10uF *************** C4055 1-126-964-11 ELECT 10uF C4056 1-136-165-00 FILM 0.1uF < CAPACITOR >...

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