Sony CDX-GT72W Service Manual
Sony CDX-GT72W Service Manual

Sony CDX-GT72W Service Manual

Fm/am compact disc player
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CDX-GT72W/GT720/GT770
SERVICE MANUAL
Ver. 1.0 2007.12
• The tuner and CD sections have no adjustments.
AUDIO POWER SPECIFICATIONS
(CDX-GT72W/GT720)
POWER OUTPUT AND TOTAL HARMONIC DISTORTION
23.2 watts per channel minimum continuous average power into
4 ohms, 4 channels driven from 20 Hz to 20 kHz with no more
than 5% total harmonic distortion.
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:
CDX-GT72W/GT720:
87.5 – 107.9 MHz
CDX-GT770:
87.5 – 108.0 MHz (at 50 kHz step)
87.5 – 107.9 MHz (at 200 kHz step)
FM tuning interval:
CDX-GT770:
50 kHz/200 kHz switchable
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
Sony Corporation
9-887-940-01
2007L04-1
Audio Business Group
©
2007.12
Published by Sony Techno Create Corporation
(Photo: CDX-GT720)
SPECIFICATIONS
AM
Tuning range:
CDX-GT72W/GT720:
530 – 1,710 kHz
CDX-GT770:
531 – 1,602 kHz (at 9 kHz step)
530 – 1,710 kHz (at 10 kHz step)
AM tuning interval:
CDX-GT770:
9 kHz/10 kHz switchable
Antenna (aerial) terminal:
External antenna (aerial) connector
Intermediate frequency: 10.7 MHz/450 kHz
Sensitivity: 30 μV
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/rear)
Subwoofer output terminal (mono)
Power antenna (aerial) relay control terminal
Power amplifi er control terminal
FM/AM COMPACT DISC PLAYER
Model Name Using Similar Mechanism
CD Drive Mechanism Type
Optical Pick-up Name
Inputs:
Telephone ATT control terminal
Illumination control terminal
BUS control input terminal
BUS audio input terminal
Remote controller input terminal
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)
Power requirements: 12 V DC car battery
(negative ground (earth))
Dimensions: Approx. 178 × 50 × 190 mm
(7
× 2 × 7
1/8
Mounting dimensions:
Approx. 182 × 53 × 163 mm
(7
× 2
× 6
1/4
1/8
Mass: Approx. 1.6 kg (3 lb 9 oz)
Supplied accessories:
Card remote commander:
RM-X152 (CDX-GT72W/GT720)
RM-X156 (CDX-GT770)
Parts for installation and connections (1 set)
Design and specifi cations are subject to change
without notice.
US Model
CDX-GT72W/GT720
E Model
CDX-GT770
NEW
MG-101FC-188//Q
DAX-25A
in.) (w/h/d)
1/2
in.) (w/h/d)
1/2

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Summary of Contents for Sony CDX-GT72W

  • Page 1 Power amplifi er control terminal Design and specifi cations are subject to change Frequency response: 30 – 15,000 Hz without notice. FM/AM COMPACT DISC PLAYER Sony Corporation 9-887-940-01 2007L04-1 Audio Business Group © 2007.12 Published by Sony Techno Create Corporation...
  • Page 2 LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE FONC- TIONNEMENT. NE REMPLACER CES COM- POSANTS QUE PAR DES PIÈCES SONY DONT LES NUMÉROS SONT DON- NÉS DANS CE MANUEL OU DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.
  • Page 3: Table Of Contents

    CDX-GT72W/GT720/GT770 This compact disc player is classifi ed as a CLASS 1 LASER TABLE OF CONTENTS product. The CLASS 1 LASER PRODUCT label is located on the exterior. SERVICE NOTE ............. CDX-GT770: GENERAL Location of Controls ............Connections ..............DISASSEMBLY 3-1.
  • Page 4: Service Note

    CDX-GT72W/GT720/GT770 SECTION 1 SERVICE NOTE EXTENSION CABLE AND SERVICE POSITION NOTE FOR REPLACEMENT OF THE SERVO BOARD When repairing or servicing this set, connect the jig (extension When repairing, the complete SERVO board (A-1177-362-A) cable) as shown below. should be replaced since any parts in the SERVO board cannot be repaired.
  • Page 5: Location Of Controls

    CDX-GT72W/GT720/GT770 SECTION 2 GENERAL This section is extracted from instruction manual. • LOCATION OF CONTROLS • CDX-GT72W Location of controls and basic operations Main unit The following buttons on the card remote Push up/down to: commander have also different buttons/functions –...
  • Page 6: Connections

    Press to: Enter sound setting/apply a setting. inserted to activate the unit first. Press and hold to: Enter menu. • CONNECTIONS • CDX-GT72W Connection example Notes ( - A ) • Be sure to connect the ground (earth) lead before connecting the amplifier.
  • Page 7 CDX-GT72W/GT720/GT770 Source selector (not supplied) Supplied with the CD/MD changer Selector de fuente Suministrado con el cambiador de CD/MD (no suministrado) XA-C40 AUDIO OUT REMOTE BUS AUDIO IN FRONT SUB OUT (MONO) AUDIO AUDIO RCA pin cord (not supplied) AUDIO...
  • Page 8 CDX-GT72W/GT720/GT770 • CDX-GT720 Connection example Notes ( - A ) • Be sure to connect the ground (earth) lead before connecting the amplifier. AUDIO OUT • The alarm will only sound if the built-in amplifier is used. FRONT Tip (...
  • Page 9 CDX-GT72W/GT720/GT770 Source selector (not supplied) Supplied with the CD/MD changer Sélecteur de source Fourni avec le changeur de CD/MD (non fourni) XA-C40 AUDIO OUT REMOTE BUS AUDIO IN FRONT SUB OUT (MONO) AUDIO AUDIO RCA pin cord (not supplied) AUDIO...
  • Page 10 CDX-GT72W/GT720/GT770 • CDX-GT770 Connection example Notes ( - A ) • Be sure to connect the ground (earth) lead before connecting the amplifier. AUDIO OUT • The alarm will only sound if the built-in amplifier is used. FRONT Tip (...
  • Page 11 CDX-GT72W/GT720/GT770 Source selector (not supplied) Selector de fuente Supplied with the CD/MD changer (no suministrado) Suministrado con el cambiador de CD/MD XA-C40 AUDIO OUT REMOTE BUS AUDIO IN FRONT SUB OUT (MONO) AUDIO AUDIO RCA pin cord (not supplied) AUDIO...
  • Page 12: Disassembly

    CDX-GT72W/GT720/GT770 SECTION 3 DISASSEMBLY • This set can be disassembled in the order shown below. 3-1. BASE PANEL ASSY (Page 13) 3-2. SUB PANEL ASSY (Page 13) 3-3. CD MECHANISM BLOCK (Page 14) 3-4. DRIVING SECTION (DB-F07) 3-6. SERVO BOARD...
  • Page 13: Base Panel Assy

    CDX-GT72W/GT720/GT770 Note: Follow the disassembly procedure in the numerical order given. 3-1. BASE PANEL ASSY two screws (panel F) bracket (PWB) base panel assy two screws (panel F) FLEXIBLE board (36 core) (CN905) (Take care not to pull the two screws (T)
  • Page 14: Cd Mechanism Block

    CDX-GT72W/GT720/GT770 3-3. CD MECHANISM BLOCK CD mechanism block two screws (+PTT 2.6 × 4) bracket (CD) screw (+PTT 2.6 × 6) CNP301 screw (+PTT 2.6 × 6) 3-4. DRIVING SECTION (DB-F07) screw (+PTT 2.6 × 6) driving section (DB-F07) CN702 (7P) screw (+PTT 2.6 ×...
  • Page 15: Main Board

    CDX-GT72W/GT720/GT770 3-5. MAIN BOARD two screws screw (+P 2.6 × 8) two screws screw (+PTT 2.6 × 10) (+PTT 2.6 × 8) (+PTT 2.6 × 8) two screws (+PTT 2.6 × 12) heat sink cord (automobile) three ground point screws (+PTT 2.6 ×...
  • Page 16: Chassis (T) Sub Assy

    CDX-GT72W/GT720/GT770 3-7. 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 3-8. ROLLER ARM ASSY roller arm assy gear (RA1) spring (RAL) washer spring (RAR)
  • Page 17: Chassis (Op) Assy

    CDX-GT72W/GT720/GT770 3-9. CHASSIS (OP) ASSY chassis (OP) assy tension spring (KF) coil spring (damper) (natural) coil spring (damper) (green) slider (R) lever (D) gear (LE1) 3-10. CHUCKING ARM SUB ASSY chucking arm sub assy spring Note: Have this portion receive the chassis.
  • Page 18: Sled Motor Assy

    CDX-GT72W/GT720/GT770 3-11. SLED MOTOR ASSY three serration screws (M 2 × 3) sled mtor 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 19: Optical Pick-Up Section

    CDX-GT72W/GT720/GT770 3-12. 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. 3-13. OPTICAL PICK-UP pan tapping screw (M 1.4 × 2.5) leaf spring (sub guide) leaf spring (OP)
  • Page 20: Diagnosis Function

    CDX-GT72W/GT720/GT770 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 DIAG With the power off, press the [4] button, [5] button, and [4] but- ton on the remote control (for more than 2 seconds) in turn.
  • Page 21 CDX-GT72W/GT720/GT770 4-4. Operating hours display mode The display mode is switched by each rotation of [+] or [–] keys during the CD error information display mode. DIAG CD error info history 1 (latest) Error description plus error details display Operating hours...
  • Page 22 CDX-GT72W/GT720/GT770 4-6. OFFSET/FAILURE error display mode DIAG Operating hours Error description (0: OFFSET, 1: FAILURE) Recency of information 1-3: 1 represents the latest. Diag code 06: OFFSET/FAILURE The display mode is switched by each rotation of [+] or [–] keys during the OFFSET/FAILURE error display mode.
  • Page 23: Diagrams

    CDX-GT72W/GT720/GT770 SECTION 5 DIAGRAMS 5-1. BLOCK DIAGRAM – MAIN Section – ELECTRONIC VOLUME 4V PRE AMP PJ401 (1/2) IC401 IC402 PJ401 (2/2) OUTR2 17 RL+ OUT(RL) AUDIO AUDIO OUT BUS-RCH OUTR1 R-CH REAR MUTE R-CH 2 BUS-LCH (REAR) Q181 (REAR)
  • Page 24: Block Diagram -Display Section

    CDX-GT72W/GT720/GT770 5-2. BLOCK DIAGRAM – DISPLAY Section – FL900 FLUORESCENT DISPLAY CONTROL INDICTOR TUBE IC901 85 KEY 1 KEY 2 MATRIX KEY PUSH ENC901(2/2), S911–919 LAT TA2 OUT SYSTEM CONTROL VDD1 FL VDD+3.3V IC303 (2/2) VDD2 FL VDD+55V FL DAT1...
  • Page 25 CDX-GT72W/GT720/GT770 THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS. • Waveforms – MAIN Board – – DISPLAY Board – (In addition to this, the necessary note is printed in each block.) For Printed Wiring Boards. For Schematic Diagrams.
  • Page 26: Printed Wiring Boards -Main Section (1/2)

    CDX-GT72W/GT720/GT770 5-3. PRINTED WIRING BOARDS – MAIN Section (1/2) – • : Uses unleaded solder. • Semiconductor Location Ref. No. Location Ref. No. Location Ref. No. Location D101 B-10 (D622) Q101 D-10 (D102) (D623) Q102 (D103) D625 Q103 (D104) D-10...
  • Page 27: Printed Wiring Board -Main Section (2/2)

    CDX-GT72W/GT720/GT770 5-4. PRINTED WIRING BOARD – MAIN Section (2/2) – • : Uses unleaded solder. PJ401 AUDIO AUDIO SUB OUT AUDIO (MONO) REAR FRONT PJ501 CNJ101 (ANTENNA) (REMOTE IN) CNP102 (BUS CONTROL IN) C232 C227 R505 CNP102 C228 FB111 C210...
  • Page 28: Schematic Diagram -Main Section (1/4)

    CDX-GT72W/GT720/GT770 5-5. SCHEMATIC DIAGRAM – MAIN Section (1/4) – • See page 36 for IC Block Diagrams. TUX501 R494 IC470 C405 C492 C406 R493 PJ501 IC B/D IC B/D IC401 IC402 C410 C440 JR609 FB502 C472 R437 C420 Q501 L503...
  • Page 29: Schematic Diagram -Main Section (2/4)

    CDX-GT72W/GT720/GT770 5-6. SCHEMATIC DIAGRAM – MAIN Section (2/4) – • See page 37 for IC Block Diagram. PJ401 C215 C210 C228 C205 C227 CN401 C457 C477 C242 FB402 IC B/D C442 C467 C487 C142 D111 R495 C493 R142 R242 D110...
  • Page 30: Schematic Diagram -Main Section (3/4)

    CDX-GT72W/GT720/GT770 5-7. SCHEMATIC DIAGRAM – MAIN Section (3/4) – • See page 25 for waveforms. • See page 37 for IC Block Diagrams. • See page 39 for IC Pin Function Description of IC303. (Page 28) (Page 29) JR618 D402...
  • Page 31: Schematic Diagram -Main Section (4/4)

    CDX-GT72W/GT720/GT770 5-8. SCHEMATIC DIAGRAM – MAIN Section (4/4) – • See page 38 for IC Block Diagrams. (Page 29) (Page 28) CN801 Q301 Q642 L304 R625 R318 C340 Q624 Q623 R319 C622 L620 Q302 C342 C632 C512 D814 (Page 30)
  • Page 32: Printed Wiring Board -Base Panel Section

    CDX-GT72W/GT720/GT770 5-9. PRINTED WIRING BOARD – BASE PANEL Section – • : Uses unleaded solder. S902 S901 CN904 (NOSE DET) RESET DISPLAY BOARD CN902 (Page 34) MAIN BOARD CN801 (Page 26) CDX-GT72W/GT720/GT770...
  • Page 33: Schematic Diagram -Base Panel Section

    CDX-GT72W/GT720/GT770 5-10. SCHEMATIC DIAGRAM – BASE PANEL Section – CN904 CN905 (Page 35) (Page 31) S902 S901 CDX-GT72W/GT720/GT770...
  • Page 34: Printed Wiring Boards -Display Section

    CDX-GT72W/GT720/GT770 5-11. PRINTED WIRING BOARDS – DISPLAY Section – • : Uses unleaded solder. LED902, LED907 S915 S915 LED904, S916 S916 LED902 IC903 LED923 LED904 R912 LED906 LED930, S914 LED930 (GT72W/GT720) LED905 (GT770) LED928, S913 LED928 LED903, LED920 S912 LED901...
  • Page 35: Schematic Diagram -Display Section

    CDX-GT72W/GT720/GT770 5-12. SCHEMATIC DIAGRAM – DISPLAY Section – • See page 25 for waveform. • See page 41 for IC Pin Function Description of IC901. R970 R971 R972 R973 R974 R975 R976 R977 R978 R931 R932 R933 R934 D951 TP915...
  • Page 36 CDX-GT72W/GT720/GT770 • IC Block Diagrams IC401 BD3442FS-E2 (MAIN Board (1/4)) IC402 NJM2792V(TE2) (MAIN Board (1/4)) GND (L) LIFT AMP BUS-R CIN (L) VCC2 32 FIL 100k COUT (L) 31 GND BUS-L OUT (RL) OUT (FL) INPUT INPUT VOLUME1 TREBLE VOLUME2...
  • Page 37 CDX-GT72W/GT720/GT770 IC201 TDA8588AJ/N2/R1 (MAIN Board (2/4)) OUT–FL– C BUS OUT–FL+ OUT–RL– PGND3 OUT–RL+ IN–RL IN–FL S–GND PROTECTION/ DIAGNOSTIC IN–FR IN–RR AC GND OUT–RR+ PGND2 OUT–RR– OUT–FR+ STANDBY/ MUTE OUT–FR– CHIP DETECT/ DIAGNOSTIC PGND1 BATTERY TEMPERATURE DIAG DETECTION PROTECTION ENABLE LOGIC SWITCH SW2(ANT–REM)
  • Page 38 CDX-GT72W/GT720/GT770 IC703 BA09CCOWFP-E2 (MAIN Board (3/4)) VREF DRIVER IC620 NJM2377M(TE2) (MAIN Board (4/4)) VREF U.VLO S.C.P ER.AMP 0.52V IC110 BA8271F-E2 (MAIN Board (4/4)) BUS ON BUS ON SWITCH RESET RESET SWITCH BUS ON CLK IN BATTERY BATT B CHK SWITCH...
  • Page 39 DST SEL0 Destination setting pin 0 FSW IN D/D converter oscillator frequency count control signal input UNI SO SONY bus serial data signal output UNI SI SONY bus serial data signal input UNI CKO SONY bus serial clock signal output BYTE Connect to ground.
  • Page 40 CDX-GT72W/GT720/GT770 Pin No. Pin Name Description TEST IN Test mode detect signal input Not used in this set. (Open) RC IN1 Rotary commander shift key signal input SYSRESET System reset signal output BUS ON Bus on signal output FSW OUT...
  • Page 41 CDX-GT72W/GT720/GT770 DISPLAY BOARD IC901 M30876FJBA03GP (DISPLAY CONTROL) Pin No. Pin Name Description SYS CE Main chip enable signal input Not used. (Open) FL DAT3 Fluorescent indicator tube serial data signal output 3 Not used. (Open) FL CLK IN Fluorescent indicator tube serial clock signal input BYTE Connect to ground.
  • Page 42 CDX-GT72W/GT720/GT770 Pin No. Pin Name Description AVSS — Ground pin Not used. (Open) VREF — Reference voltage power supply pin (+3.3 V) AVCC — Power supply pin (+3.3 V) Not used. (Open) FL DAT2 Fluorescent indicator tube serial data signal output 2...
  • Page 43: Exploded Views

    CDX-GT72W/GT720/GT770 SECTION 6 EXPLODED VIEWS Note: • -XX and -X mean standardized parts, so • The mechanical parts with no reference The components identifi ed by mark 0 they may have some difference from the number in the exploded views are not sup- or dotted line with mark 0 are critical for original one.
  • Page 44: Main Board Section

    CDX-GT72W/GT720/GT770 6-2. MAIN BOARD SECTION not supplied TUX501 not supplied not supplied Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark A-1441-047-A MAIN BOARD, COMPLETE (GT72W/GT720) TUX501 A-3220-961-B TUNER UNIT (TUX-032) A-1441-049-A MAIN BOARD, COMPLETE (GT770) 7-685-792-09 SCREW +PTT 2.6X6 (S)
  • Page 45: Front Section

    CDX-GT72W/GT720/GT770 6-3. FRONT SECTION not supplied not supplied (DISPLAY board) not supplied not supplied not supplied not supplied (JACK board) FL900 not supplied not supplied Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark X-2189-354-1 BUTTON (ASSY) (S) (GT72W/GT720)
  • Page 46: Cd Mechanism Section (Mg-101Fc-188//Q)

    CDX-GT72W/GT720/GT770 6-4. CD MECHANISM SECTION (MG-101FC-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 47: Electrical Parts List

    CDX-GT72W/GT720/GT770 SECTION 7 BASE PANEL DISPLAY 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 48 CDX-GT72W/GT720/GT770 DISPLAY JACK MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark LED902 6-502-237-01 LED CL-321YF-D-T (MODE) R971 1-216-818-11 METAL CHIP 1/10W LED903 6-502-237-01 LED CL-321YF-D-T (DSPL) R972 1-216-818-11 METAL CHIP 1/10W LED904 6-502-237-01 LED CL-321YF-D-T (SHUF)
  • Page 49 CDX-GT72W/GT720/GT770 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C111 1-162-970-11 CERAMIC CHIP 0.01uF C423 1-136-159-00 FILM 0.033uF C112 1-162-964-11 CERAMIC CHIP 0.001uF C424 1-136-159-00 FILM 0.033uF C121 1-124-231-61 ELECT 4.7uF C425 1-124-717-85 ELECT C142...
  • Page 50 CDX-GT72W/GT720/GT770 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C626 1-115-339-11 CERAMIC CHIP 0.1uF D620 8-719-053-18 DIODE 1SR154-400TE-25 C628 1-164-004-11 CERAMIC CHIP 0.1uF D621 8-719-053-18 DIODE 1SR154-400TE-25 C629 1-126-933-11 ELECT 100uF D622 6-501-089-01 DIODE RF101L2STE25...
  • Page 51 CDX-GT72W/GT720/GT770 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark L620 1-457-073-11 COIL, CHOKE 47uH R126 1-216-851-11 METAL CHIP 330K 1/10W R127 1-216-851-11 METAL CHIP 330K 1/10W < JACK > R142 1-216-821-11 METAL CHIP 1/10W R143...
  • Page 52 CDX-GT72W/GT720/GT770 MAIN SERVO SUB PANEL Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R374 1-216-845-11 METAL CHIP 100K 1/10W R622 1-218-863-11 METAL CHIP 4.7K 0.5% 1/10W (GT770) R623 1-218-895-11 METAL CHIP 100K 0.5% 1/10W R375 1-216-845-11...
  • Page 53 CDX-GT72W/GT720/GT770 SUB PANEL Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark < RESISTOR > PARTS FOR INSTALLATION AND CONNECTIONS ************************************** R990 1-216-825-11 METAL CHIP 2.2K 1/10W R991 1-216-825-11 METAL CHIP 2.2K 1/10W X-2179-431-1 FRAME ASSY, FITTING...
  • Page 54 CDX-GT72W/GT720/GT770 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 2007.12...

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