Sony CDX-GT373A Service Manual
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Sony CDX-GT373A Service Manual

Sony CDX-GT373A Service Manual

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SERVICE MANUAL
Ver. 1.0 2008.03
• The tuner and CD sections have no adjustments.
CD Player section
Signal-to-noise ratio: 120 dB
Frequency response: 10 – 20,000 Hz
Wow and fl utter: Below measurable limit
Tuner section
FM
Tuning range:
87.5 – 107.9 MHz
Antenna (aerial) terminal:
External antenna (aerial) connector
Intermediate frequency: 10.7 MHz/450 kHz
Usable sensitivity: 9 dBf
Selectivity: 75 dB at 400 kHz
Signal-to-noise ratio:
67 dB (stereo), 69 dB (mono)
Harmonic distortion at 1 kHz:
0.5 % (stereo), 0.3 % (mono)
Separation: 35 dB at 1 kHz
Frequency response: 30 – 15,000 Hz
AM
Tuning range: 530 – 1,710 kHz
Antenna (aerial) terminal:
External antenna (aerial) connector
Intermediate frequency: 10.7 MHz/450 kHz
Sensitivity: 30 μV
Sony Corporation
9-889-023-01
2008C04-1
Audio Business Group
©
2008.03
Published by Sony Techno Create Corporation
CDX-GT373A
Model Name Using Similar Mechanism
CD Drive Mechanism Type
Optical Pick-up Name
SPECIFICATIONS
Power amplifi er section
Outputs: Speaker outputs (sure seal connectors)
Speaker impedance: 4 – 8 ohms
Maximum power output: 52 W × 4 (at 4 ohms)
General
Outputs:
Audio outputs terminal (front, sub/rear
switchable)
Power antenna (aerial) relay control terminal
Power amplifi er control terminal
Inputs:
Antenna (aerial) input terminal
AUX input jack (stereo mini jack)
Tone controls:
Low: ±10 dB at 60 Hz (XPLOD)
Mid: ±10 dB at 1 kHz (XPLOD)
High: ±10 dB at 10 kHz (XPLOD)
FM/AM COMPACT DISC PLAYER
E Model
CDX-GT272
MG-101TC-188//C
DAX-25A
Power requirements: 12 V DC car battery
(negative ground (earth))
Dimensions: Approx. 178 × 50 × 179 mm
1
1
(7
/
× 2 × 7
/
in.) (w/h/d)
8
8
Mounting dimensions: Approx.
182 × 53 × 162 mm
1
1
1
(7
/
× 2
/
× 6
/
in.) (w/h/d)
4
8
2
Mass: Approx. 1.2 kg (2 lb 11 oz)
Supplied accessories:
Card remote commander: RM-X151
Parts for installation and connections (1 set)
Design and specifi cations are subject to change
without notice.

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Summary of Contents for Sony CDX-GT373A

  • Page 1 Tuning range: 530 – 1,710 kHz Antenna (aerial) terminal: External antenna (aerial) connector Intermediate frequency: 10.7 MHz/450 kHz Sensitivity: 30 μV FM/AM COMPACT DISC PLAYER Sony Corporation 9-889-023-01 2008C04-1 Audio Business Group © 2008.03 Published by Sony Techno Create Corporation...
  • Page 2 COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH MARK 0 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.

  • Page 3: Table Of Contents

    CDX-GT373A TABLE OF CONTENTS SERVICE NOTE DIAGRAMS ............6-1. Block Diagram –Main Section– ........17 GENERAL 6-2. Block Diagram –Display Section– ......... 18 6-3. Printed Wiring Board –Main Section– ......19 Location of Controls ............6-4. Schematic Diagram –Main Section (1/3)– ...... 20 Connections ..............
  • Page 4 CDX-GT373A NOTE FOR REPLACEMENT OF THE AUX JACK (J901) NOTE FOR REPLACEMENT OF THE SERVO BOARD To replace the AUX jack requires alignment. When repairing, the complete SERVO board (A-1201-631-A) 1. Insert the AUX jack into the KEY board. should be replaced since any parts in the SERVO board cannot be 2.

  • Page 5: General

    CDX-GT373A SECTION 2 This section is extracted GENERAL from instruction manual. • LOCATION OF CONTROLS Location of controls and basic operations I MODE button page 8 Main unit The following buttons on the card remote commander have also different buttons/functions To select the radio band (FM/AM).
  • Page 6 CDX-GT373A RCA pin cord (not supplied) AUDIO OUT can be switched SUB or REAR. For details, see the supplied Operating Instructions. Cable con terminales RCA (no suministrado) AUDIO OUT (salida de audio) puede cambiarse a SUB (altavoz potenciador de graves) o REAR (posterior). Para obtener información, consulte el manual de instrucciones...

  • Page 7: Disassembly

    CDX-GT373A SECTION 3 DISASSEMBLY • This set can be disassembled in the order shown below. 3-1. SUB PANEL ASSY 3-5. SERVO BOARD (Page 7) (Page 9) 3-2. CD MECHANISM BLOCK 3-6. CHASSIS (T) SUB ASSY (Page 8) (Page 10) 3-7.

  • Page 8: Cd Mechanism Block

    CDX-GT373A 3-2. CD MECHANISM BLOCK bracket (CD) CD mechanism block two screws (+PTT 2.6 × 4) screw (+PTT 2.6 × 6) CN350 screw (+PTT 2.6 × 6) 3-3. MAIN BOARD two screws (+PTT 2.6 × 8) two screws (+P 2.6 × 8) two screws (+PTT 2.6 ×...

  • Page 9: Microphone (Mic901)

    CDX-GT373A 3-4. MICROPHONE (MIC901) holder (LED) upper claw claw microphone (MIC901) CN200 (2P) MAIN board screw (+B P-tite M2) 3-5. SERVO BOARD toothed lock screw (M 1.7 × 2.5) toothed lock screw (M 1.7 × 2.5) SERVO board SERVO board Remove the eleven solders.

  • Page 10: Chassis (T) Sub Assy

    CDX-GT373A 3-6. CHASSIS (T) SUB ASSY two precision screws two precision screws (+P 1.7 × 2.2) (+P 1.7 × 2.2) chassis (T) sub assy claw 3-7. ROLLER ARM ASSY roller arm assy gear (RA1) spring (RAL) washer spring (RAR)

  • Page 11: Chassis (Op) Assy

    CDX-GT373A 3-8. CHASSIS (OP) ASSY chassis (OP) assy tension spring (KF) coil spring (damper) (natural) coil spring (damper) (green) slider (R) lever (D) gear (LE1) 3-9. CHUCKING ARM SUB ASSY chucking arm sub assy spring Note: Have this portion receive the chassis.

  • Page 12: Sled Motor Assy

    CDX-GT373A 3-10. SLED MOTOR ASSY three serration screws (M 2 × 3) sled motor assy spring turn table spring stand Note: Never remove these parts since they were adjusted. stand Note: Place the stand with care not to touch the turn table.

  • Page 13: Optical Pick-Up Section

    CDX-GT373A 3-11. OPTICAL PICK-UP SECTION optical pick-up section Note: Be careful not to touch the lens and hologram terminal when removing the optical pick-up section. 3-12. OPTICAL PICK-UP pan tapping screw (M 1.4 × 2.5) leaf spring (sub guide) leaf spring (OP)

  • Page 14: Diagnosis Function

    CDX-GT373A SECTION 4 DIAGNOSIS FUNCTION Description of the Diagnostics function: 4. Contents of each display mode 4-1. Reset count display mode 1. Setting the Diag display mode With the power off, press the [4] button, [5] button, and [4] button on the set body or the remote control (for more than 2 seconds) in turn.
  • Page 15 CDX-GT373A 4-5. CD error information display mode 4-6. OFFSET/FAILURE error display mode 4-5-1. Error description Operating hours Error information Error description Error description (in hexadecimal Indication Description (0: OFFSET, 1: FAILURE) format) SERVO ERROR Recency of information Recency of information...

  • Page 16: Electrical Adjustments

    CDX-GT373A SECTION 5 ELECTRICAL ADJUSTMENTS MIC SENSITIVITY ADJUSTMENT •Replace all of the follwing parts at the same time when replacing the microphone (MIC901) or if there is any faulty semi-fi xed resistor (R290) . • MIC901 : Part No. 1-542-689-41 : 6.8 kΩ...

  • Page 17: Diagrams

    CDX-GT373A SECTION 6 DIAGRAMS 6-1. BLOCK DIAGRAM – MAIN Section – ELECTRONIC VOLUME IC401 SUBOUT L REAR SUBOUT R R-CH J652 R-CH 1 BUS-RCH AUDIO 2 BUS-LCH FRONT R-CH I2C BUS CONTROLLED R-CH POWER AMP/MULTIPLE J901 VOLTAGE REGULATOR 9 AUX-LCH...

  • Page 18: Block Diagram -Display Section

    CDX-GT373A 6-2. BLOCK DIAGRAM – DISPLAY Section – THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS. (In addition to this, the necessary note is printed in each block.) SYSTEM CONTROL LCD DRIVE IC501 (2/2) IC901 For Printed Wiring Boards.

  • Page 19: Printed Wiring Board -Main Section

    CDX-GT373A Refer to the MIC SENSITIVITY ADJUSTMENT described on page 16 if the microphone (MIC901) or any semi-fi xed resistor (R290) is faulty. 6-3. PRINTED WIRING BOARD – MAIN Section – • : Uses unleaded solder. J652 JC31 R443 C443...

  • Page 20: Schematic Diagram -Main Section (1/3)

    CDX-GT373A 6-4. SCHEMATIC DIAGRAM – MAIN Section (1/3) – • See page 25 for IC Block Diagrams. C303 C302 L902 C325 C444 C424 C330 C306 JC29 JC30 JC31 L901 C301 R445 R423 C308 C304 C309 C305 C307 C317 C318 IC300...

  • Page 21: Schematic Diagram -Main Section (2/3)

    CDX-GT373A 6-5. SCHEMATIC DIAGRAM – MAIN Section (2/3) – • See page 26 for IC Block Diagrams. J652 C442 C440 C452 C432 R448 R447 R449 R450 JC420 C445 C443 R443 JC421 C426 C423 R424 C361 C362 C473 JC422 C463 Q420...

  • Page 22: Schematic Diagram -Main Section (3/3)

    CDX-GT373A 6-6. SCHEMATIC DIAGRAM – MAIN Section (3/3) – • See page 18 for waveforms. • See page 26 for IC Block Diagrams. • See page 27 for IC Pin Function Description of IC501. (Page 20) (Page 21) JC602 D353...

  • Page 23: 6-7. Printed Wiring Boards -Key Section

    CDX-GT373A 6-7. PRINTED WIRING BOARD – KEY Section – • : Uses unleaded solder. LED942 LED941 LED862 LED861,941, LED861 LED862,942, S901 S902 S902 S901 C861 C862 LSW901 LCD901 LIQUID CRYSTAL DISPLAY PANEL R904 R905 S904 LSW902 R901 IC971 LSW903 LSW904...

  • Page 24: Schematic Diagram -Key Section

    CDX-GT373A 6-8. SCHEMATIC DIAGRAM – KEY Section – C861 R931 R981 R975 LED861 LED941 LSW904(2/2) LED951 LED871 R932 R949 R869 R982 R933 LSW901(2/2) LSW910(2/2) LED953 LED873 R947 R867 IC971 LSW903(2/2) LSW907(2/2) LED952 LED872 R941 R861 C971 LED931 LSW902(2/2) LSW905(2/2) LSW909(2/2)
  • Page 25 CDX-GT373A • IC Block Diagrams IC300 TDA8588AJ/N2/R1 (MAIN Board (1/3)) OUT–FL– C BUS OUT–FL+ OUT–RL– PGND1 OUT–RL+ IN–RL IN–FL S–GND PROTECTION/ DIAGNOSTIC IN–FR IN–RR BEEP OUT–RR+ PGND3 OUT–RR– OUT–FR+ STANDBY/ MUTE OUT–FR– CHIP DETECT/ PGND4 DIAGNOSTIC BATTERY TEMPERATURE DIAG DETECTION...
  • Page 26 CDX-GT373A IC401 BD3442FS-E2 (MAIN Board (2/3)) BUS-RCH VCC2 32 FIL 100k 31 GND BUS-LCH INPUT INPUT VOLUME1 TREBLE VOLUME2 100k SELECTOR GAIN /MUTE /BASS TU-RCH 3 30 SDA /MIDDLE 100k LOGIC 29 SCL TU-LCH 28 MUTE 100k CD-RCH 27 VCC...
  • Page 27 CDX-GT373A • IC Pin Function Description MAIN BOARD IC501 MB90F045PF-G-9074-SPE1 (SYSTEM CONTROL) Pin No. Pin Name Description AREASEL0 Destination function setting pin 0 AREASEL1 Destination function setting pin 1 AREASEL2 Destination function setting pin 2 AREASEL3 Destination function setting pin 3 BEEP BEEP signal output to power amplifi...
  • Page 28 CDX-GT373A Pin No. Pin Name Description LED_YELLOW Security-LED (Yellow) operation signal output UNISI S-BUS data signal input UNISO S-BUS data signal output UNISCK S-BUS clock signal output Z-MUTE CD zero cross mute detect signal input NOSE_SW Front panel attachment detect signal input “L”: Panel on, “H”: Panel off...

  • Page 29: Exploded Views

    CDX-GT373A SECTION 7 EXPLODED VIEWS Note: • The mechanical parts with no reference • -XX and -X mean standardized parts, so number in the exploded views are not sup- The components identifi ed by mark 0 they may have some difference from the plied.

  • Page 30: Front Panel Section

    SCREW (+B P-TITE M2) X-2188-485-1 PANEL (SV) ASSY, FRONT X-2186-697-1 CASE ASSY (for FRONT PANEL) X-2188-484-1 KNOB (SV) ASSY 3-251-320-01 EMBLEM (NO. 2.5), SONY 3-318-203-01 SCREW (B 1.7X6), TAPPING J901 1-820-624-11 SMALL TYPE JACK (VERTICAL) (AUX) 2-349-626-01 SPRING (RELEASE) LCD901...

  • Page 31: Cd Mechanism Section (Mg-101Tc-188//C)

    CDX-GT373A 7-3. CD MECHANISM SECTION (MG-101TC-188//Q) not supplied not supplied not supplied not supplied not supplied not supplied not supplied not supplied not supplied not supplied not supplied Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark...

  • Page 32: Electrical Parts List

    CDX-GT373A SECTION 8 ELECTRICAL PARTS LIST Note: • Due to standardization, replacements in • RESISTORS When indicating parts by reference num- the parts list may be different from the All resistors are in ohms. ber, please include the board name.
  • Page 33 CDX-GT373A MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark < RESISTOR > R985 1-216-821-11 METAL CHIP 1/10W R986 1-216-821-11 METAL CHIP 1/10W R861 1-216-815-11 METAL CHIP 1/10W R987 1-216-857-11 METAL CHIP 1/10W R862 1-216-817-11 METAL CHIP...
  • Page 34 CDX-GT373A MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C315 1-162-970-11 CERAMIC CHIP 0.01uF C514 1-162-964-11 CERAMIC CHIP 0.001uF C316 1-124-261-00 ELECT 10uF C515 1-162-970-11 CERAMIC CHIP 0.01uF C317 1-124-257-00 ELECT 2.2uF C516 1-162-970-11 CERAMIC CHIP 0.01uF...
  • Page 35 CDX-GT373A MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark D999 6-501-180-01 DIODE UDZW-TE17-18B JC504 1-216-296-11 SHORT CHIP JC505 1-216-864-11 SHORT CHIP < FUSE > JC506 1-216-296-11 SHORT CHIP JC507 1-216-296-11 SHORT CHIP F901 1-532-877-11 FUSE (BLADE TYPE) (AUTO FUSE) 10A...
  • Page 36 CDX-GT373A MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark Q606 8-729-038-28 TRANSISTOR RT1N441C-TP-1 R424 1-216-809-11 METAL CHIP 1/10W Q607 8-729-620-07 TRANSISTOR 2SC3052EF-T1-LEF R430 1-216-809-11 METAL CHIP 1/10W Q664 8-729-027-23 TRANSISTOR DTA114EKA-T146 R431 1-216-809-11 METAL CHIP...
  • Page 37 CDX-GT373A MAIN SERVO Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R567 1-216-845-11 METAL CHIP 100K 1/10W PARTS FOR INSTALLATION AND CONNECTIONS R568 1-216-849-11 METAL CHIP 220K 1/10W ************************************** R570 1-216-809-11 METAL CHIP 1/10W R571 1-216-845-11...
  • Page 38 CDX-GT373A REVISION HISTORY Checking the version allows you to jump to the revised page. Also, clicking the version at the top of the revised page allows you to jump to the next revised page. Ver. Date Description of Revision 2008.03...

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