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Sony HCD-GX25 Service Manual

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SERVICE MANUAL
Ver 1.0 2003. 03
• HCD-GX25 is the tuner, deck, CD
and amplifier section in MHC-
GX25.
Amplifier section
Continuous RMS power output (reference)
120+120 watts (6 ohms at
1 kHz, 10% THD)
Total harmonic distortion
less than 0.07%
(6 ohms at 1 kHz, 60W)
Inputs
GAME INPUT AUDIO L/R (phono jacks):
voltage 250 mV,
impedance 47 kilohms
GAME INPUT VIDEO (phono jack):
1 Vp-p, 75 ohms
Outputs
PHONES (stereo mini jack):
accepts headphones of
8 ohms or more
VIDEO OUT (phono jack):
max. output level 1 Vp-p,
unbalanced, Sync negative,
load impedance 75 ohms
SPEAKER:
accepts impedance of 6 to
16 ohms
Sony Corporation
9-877-125-01
2003C0400-1
Home Audio Company
© 2003. 03
Published by Sony Engineering Corporation
HCD-GX25
Model Name Using Similar Mechanism
CD
CD Mechanism Type
Section
Optical Pick-up Name
Tape deck Model Name Using Similar Machanism
Section
Tape Transport Mechanism Type
SPECIFICATIONS
CD player section
System
Laser
Frequency response
Wavelength
Signal-to-noise ratio
Dynamic range
Tape deck section
Recording system
Frequency response
MINI HIFI COMPONENT SYSTEM
US Model
NEW
CDM74F-K6BD72
KSM-213DCP
NEW
CWM43FF-05
Compact disc and digital
audio system
Semiconductor laser
(λ=780 nm)
Emission duration:
continuous
2 Hz – 20 kHz (±0.5 dB)
780 – 790 nm
More than 90 dB
More than 90 dB
4-track 2-channel stereo
50 – 13,000 Hz (±3 dB),
using Sony TYPE I
cassette
– Continued on next page –
1

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  • Page 1 HCD-GX25 SERVICE MANUAL US Model Ver 1.0 2003. 03 • HCD-GX25 is the tuner, deck, CD and amplifier section in MHC- GX25. Model Name Using Similar Mechanism CD Mechanism Type CDM74F-K6BD72 Section Optical Pick-up Name KSM-213DCP Tape deck Model Name Using Similar Machanism...

  • Page 2: Leakage Test

    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 HCD-GX25 MODEL IDENTIFICATION NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT – BACK PANEL – PARTS No. The laser diode in the optical pick-up block may suffer electrostatic breakdown because of the potential difference generated by the charged electrostatic load, etc. on clothing and the human body.

  • Page 4: Table Of Contents

    HCD-GX25 TABLE OF CONTENTS 1. GENERAL Main Unit ................5 Remote Control ............... 6 2. DISASSEMBLY 2-1. Case (Top) ................8 2-2. CD Door ................8 2-3. Front Panel Section ............. 9 2-4. CD Mechanism Block ............10 2-5. Tape Mechanism Deck ............10 2-6.
  • Page 5 HCD-GX25 SECTION 1 GENERAL This section is extracted from instruction manual.
  • Page 6 HCD-GX25...

  • Page 7: Disassembly

    HCD-GX25 SECTION 2 DISASSEMBLY Note : Disassemble the unit in the order as shown below. 2-1. CASE (TOP) (Page 8) 2-2. CD DOOR (Page 8) 2-3. FRONT PANEL SECTION (Page 9) 2-4. CD MECHANISM BLOCK 2-5. TAPE MECHANISM DECK (Page 10) (Page 10) 2-6.

  • Page 8: Case (Top)

    HCD-GX25 Note : Follow the disassembly procedure in the numerical order given. 2-1. CASE (TOP) qf case (top) qa two screws (+BVTP 3 × 10) 6 two screws (case 3 TP2) case (side-L) 8 screw (+BVTP 3 × 10) case (side-R)

  • Page 9: Front Panel Section

    HCD-GX25 2-3. FRONT PANEL SECTION trans board 1 CN605 3 CN311 9 screw (flat type) (+BVTP 3 × 10) 8 screw (+BVTP 3 × 10) 2 CN304 (flat type) 7 CN305 6 CN203 5 CN202 4 CN310 0 screw (+BVTP 3 × 10) qs front panel section qa three screws (+BVTP 3 ×...

  • Page 10: Cd Mechanism Block

    HCD-GX25 2-4. CD MECHANISM BLOCK 4 CD mechanism block 3 three screws (+BVTP 3 × 10) 2 CN312 (flat type) 1 CN701 MAIN board MAIN board 2-5. TAPE MECHANISM DECK 1 connector 2 six screws (+BVTP 2.6 × 8) 3 tape mechanism deck...

  • Page 11: Panel Board, 1 Stream Led Board, Remote Board

    HCD-GX25 2-6. PANEL BOARD, 1 STREAM LED BOARD, REMOTE BOARD 5 four screws (+BVTP 2.6 × 8) 0 REMOTE board 7 two screws (+BVTP 2.6 × 8) 4 two screws (+BVTP 2.6 × 8) 9 CN607 3 two screws (+BVTP 2.6 × 8) 2 three screws (+BVTP 2.6 ×...

  • Page 12: Back Panel Section

    HCD-GX25 2-8. BACK PANEL SECTION 4 back panel section 1 CN101 (flat type) 2 two screws (+BVTP 3 × 10) 3 two screws (+BVTT 3 × 6) chassis section 2-9. MAIN BOARD MAIN board 2 MAIN board 1 two screws...

  • Page 13: Amp Board

    HCD-GX25 2-10. AMP BOARD 3 screw (+BVTP 3 × 10) two claws 4 screw 2 screw (+BVTP 3 × 10) (+BVTP 3 × 10) 5 screw (+BVTP 3 × 10) 1 CN902 6 AMP board 2-11. DRIVER BOARD, SW BOARD...

  • Page 14: Cd Block Assy

    HCD-GX25 2-12. CD BLOCK ASSY 3 floating screw (+PTPWH M2.6) 1 floating screw (+PTPWH M2.6) 6 two insulators 2 holder (213) assy qh CD block assy 5 two coil springs 0 two insulators (insulator) 9 two coil springs (insulator) 4 two floating screws 8 two stoppers (BU) (+PTPWH M2.6)

  • Page 15: Motor (Tb) Board

    HCD-GX25 2-14. MOTOR (TB) BOARD 5 table motor assy (M741) 3 MOTOR (TB) board 4 Remove the two solderings of motor. 2 two screws (+BTTP (M2.6)) 2-15. MOTOR (LD) BOARD 2 two screws (+BTTP (M2.6)) 4 Remove the two solderings of motor.

  • Page 16: Optical Pick-Up

    HCD-GX25 2-16. OPTICAL PICK-UP 5 optical pick-up 1 gear (A) claw 3 sled shaft...

  • Page 17: Diagrams

    HCD-GX25 SECTION 3 DIAGRAMS 3-1. IC PIN DESCRIPTION • IC601 LC876756C-51H7-E (SYSTEM CONTROL, FLD CONTROL) (PANEL BOARD) Pin No. Pin Name Pin Description SYS MUTE System mute signal output BU1924 DATA Not used in this set. (Connected to ground.) PWR DOWN...
  • Page 18 HCD-GX25 Pin No. Pin Name Pin Description CD VDD — CD power supply pin TUNER TUNED Tuner tuning signal input from the TU701 (tuner pack) TUNER STEREO Tuner stereo signal input from the TU701 (tuner pack) CD DRF CD DRF signal input from the IC721 (LC78646)

  • Page 19: Circuit Boards Location

    HCD-GX25 3-2. CIRCUIT BOARDS LOCATION VIDEO OUT board SW board SENSOR board TRANS board BD board MOTOR (TB) board MOTOR (LD) board DRIVER board PANEL board REMOTE board MAIN board 1 STREAM LED board GAME JACK board H/P JACK board...
  • Page 20 HCD-GX25 • Waveforms THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS. — BD Board — (In addition to this, the necessary note is (MODE: CD PLAY) printed in each block.) for schematic diagram: • All capacitors are in µF unless otherwise noted. pF: µµF 0.9Vp-p...

  • Page 21: Printed Wiring Boards -Cd Mechanism Section (1/2)

    HCD-GX25 3-3. PRINTED WIRING BOARDS — CD MECHANISM SECTION (1/2) — • Refer to page 19 for Circuit Boards Location. OPTICAL • Semiconductor PICK-IP Location BLOCK Ref. No. Location S701 IC721 M702 IC722 (LIMIT) (SPINDLE) Q701 M701 (SLED) CN708 CN710...

  • Page 22: Printed Wiring Boards -Cd Mechanism Section (2/2)

    HCD-GX25 3-4. PRINTED WIRING BOARDS — CD MECHANISM SECTION (2/2) — • Refer to page 19 for Circuit Boards Location. (Page 24) CN751 S751 • Semiconductor Location Ref. No. Location D701 D711 IC701 IC712 IC731 E-11 Q731...

  • Page 23: Schematic Diagram -Cd Mechanism Section

    HCD-GX25 • Refer to page 20 for Waveforms. 3-5. SCHEMATIC DIAGRAM — CD MECHANISM SECTION — • Refer to page 35 for IC Block Diagrams. BD BOARD Q701 LD DRIVER OPTICAL PICK-UP BLOCK R751 47k R752 47k R753 47k IC721...

  • Page 24: Printed Wiring Boards -Main Section

    HCD-GX25 3-6. PRINTED WIRING BOARDS — MAIN SECTION — • Refer to page 19 for Circuit Boards Location. VIDEO OUT BOARD TU701 PANEL BOARD DRIVER BOARD BD BOARD TUNER ANTENNA • Semiconductor CN602 CN701 CN710 PACK JK004 FM75Ω (Page 28)

  • Page 25: Schematic Diagram -Main Section (1/3)

    HCD-GX25 3-7. SCHEMATIC DIAGRAM — MAIN SECTION (1/3) — MAIN BOARD (1/3) A DECK PALYBACK 0.015 Q210,211 [2.7] 0 [2.8] 0.1 TU701 B DECK RECORD/PALYBACK/ERASE ERASE Q212 FM 75Ω COAXIAL IC201 ANTENNA REC/PB 0.015 470p 470p Q223 470p BIAS OSC...

  • Page 26: Schematic Diagrams -Main Section (2/3)

    HCD-GX25 3-8. SCHEMATIC DIAGRAMS — MAIN SECTION (2/3) — H/P JACK BOARD MAIN BOARD (2/3) Q402 BUFFER MAIN BOARD CN310 MAIN (Page 26) BOARD (1/3) Q405 (Page 25) BUFFER Q407 BUFFER IC301 INPUTSELECT, JK002 TONE CONTROL VOLUME PHONES Q310,311 BUFFER...

  • Page 27: Schematic Diagram -Main Section (3/3)

    HCD-GX25 3-9. SCHEMATIC DIAGRAM — MAIN SECTION (3/3) — (Page 25) (Page 25) MAIN BOARD (1/3) MAIN BOARD (1/3) 1314 15 18 20 MAIN BOARD (3/3) 21 23 -2.3 Q312 MUTE CN309 IC304 LINE AMP DRIVER BOARD CN701 (Page 23)

  • Page 28: Printed Wiring Boards -Panel Section

    HCD-GX25 3-10. PRINTED WIRING BOARDS — PANEL SECTION — • Refer to page 19 for Circuit Boards Location. REMOTE BOARD PANEL BOARD (Page 24) C602 MAIN BOARD CN311 C601 RM601 1-688-083- (11) FLD601(FLUORESCENT INDICATOR TUBE) C631 LED614,S614 S617 DISC1 S618 DISC2...

  • Page 29: Schematic Diagram -Panel Section

    HCD-GX25 3-11. SCHEMATIC DIAGRAM — PANEL SECTION — • Refer to page 20 for Waveforms. (Page 26) MAIN BOARD CN311 PANEL BOARD LED607 – 609, 612 HL-30105Q2AT TUNER TAPE A/B GAME Q602 – 604, 607 /BAND LED DRIVE 1 STREAM LED BOARD...

  • Page 30: Printed Wiring Board -Power Amp Section

    HCD-GX25 3-12. PRINTED WIRING BOARD — POWER AMP SECTION — • Refer to page 19 for Circuit Boards Location. • Semiconductor Location Ref. No. Location Ref. No. Location H-10 F-10 F-10 G-10 F-10 F-11 G-11 Q501 Q502 Q503 Q504 Q505...

  • Page 31: Schematic Diagram -Power Amp Section (1/2)

    HCD-GX25 3-13. SCHEMATIC DIAGRAM — POWER AMP SECTION (1/2) — R541 TH501 R529 CN501 R543 R537 D503 Q501 C521 C517 D501 R521 R559 R539 Q507 Q519 R505 R545 Q517 Q509 C503 C501 R507 R513 R549 (Page 26) C507 C505 R523...

  • Page 32: Schematic Diagram -Power Amp Section (2/2)

    HCD-GX25 3-14. SCHEMATIC DIAGRAM — POWER AMP SECTION (2/2) — (Page 31) Q530 R589 R594 R577 Q534 Q535 R580 JW501 D513 R100 Q529 R563 R564 R567 R568 R575 R105 R103 Q536 R106 R104 R578 R574 D515 D511 C531 C529 R576...

  • Page 33: Printed Wiring Board -Transformer Section

    HCD-GX25 3-15. PRINTED WIRING BOARD — TRANSFORMER SECTION — • Semiconductor Location Ref. No. Location D902 C-10 D903 C-10 D904 C-10 D905 C-10 D906 (Page 30)

  • Page 34: Schematic Diagram -Transformer Section

    HCD-GX25 3-16. SCHEMATIC DIAGRAM — TRANSFORMER SECTION — PT901 JW904 F905 CN902 JW905 JW906 F906 JW902 (Page 32) RY902 D906 R901 C901 PT902 D903 D902 CN901 D905 D904 JW901 JW909 C902...

  • Page 35: Ic Block Diagrams

    HCD-GX25 3-17. IC BLOCK DIAGRAMS IC721 LC78646E-E (BD BOARD) 78 77 76 75 74 73 72 71 69 68 67 66 65 64 63 62 61 FIN1 – FIN2 – TIN1 TBAL – – TIN2 – – TBAL – RFMON...
  • Page 36 HCD-GX25 IC701 BA6956AN (DRIVER BOARD) IC712 BA6956AN (DRIVER BOARD) CONTROL LOGIC...

  • Page 37: Exploded Views

    HCD-GX25 SECTION 4 EXPLODED VIEWS NOTE: • The mechanical parts with no reference • -XX and -X mean standardized parts, so The components identified by mark 0 or dotted line with mark number in the exploded views are not supplied.

  • Page 38: Front Panel Section

    4-244-661-01 PANEL, SUB 1-827-145-11 WIRE (FLAT TYPE) (13 CORE) 4-244-669-01 WINDOW, DISPLAY 4-244-679-01 BUTTON, DISC 4-224-104-41 DAMPER 4-244-687-01 HOLDER, GAME MIXING 3-038-018-01 EMBLEM, SONY 4-244-684-01 BUTTON, EQ 4-244-676-01 BUTTON, FUNCTION 4-231-841-01 SPRING (HEART CAM-B) 4-244-677-01 LENS, POWER 4-246-087-01 BUTTON (A), PAUSE...

  • Page 39: Main Board Section

    HCD-GX25 4-3. MAIN BOARD SECTION not supplied not supplied not supplied PT902 F905 F906 not supplied The components identified by mark 0 or dotted line with mark 0 are critical for safety. Replace only with part number specified. Ref. No.

  • Page 40: Cd Mechanism Deck Section (1)

    HCD-GX25 4-4. CD MECHANISM DECK SECTION (1) (CDM74F-K6BD72) M741 chassis assy Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 4-218-253-21 SCREW (M2.6), +BTTP 1-687-132-11 SENSOR BOARD 1-776-182-11 WIRE (FLAT TYPE) (5 CORE) 4-243-820-01 GEAR (TABLE) 1-687-134-11 MOTOR (TB) BOARD...

  • Page 41: Cd Mechanism Deck Section (2)

    HCD-GX25 4-5. CD MECHANISM DECK SECTION (2) (CDM74F-K6BD72) not supplied KSM-213DCP M751 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 1-687-135-11 DRIVER BOARD 4-243-822-01 LEVER (LIFTER) 4-218-253-31 SCREW (M2.6), +BTTP X-4955-707-1 PULLEY (A5) ASSY, CHUCKING 1-687-669-11 SW BOARD...

  • Page 42: Optical Pick-Up Section

    HCD-GX25 4-6. OPTICAL PICK-UP SECTION (KSM-213DCP) M702 M701 The components identified by mark 0 or dotted line with mark 0 are critical for safety. Replace only with part number specified. Ref. No. Part No. Description Remark Ref. No. Part No.

  • Page 43: Electrical Parts List

    HCD-GX25 SECTION 5 ELECTRICAL PARTS LIST NOTE: • Due to standardization, replacements in • Items marked “*” are not stocked since The components identified by mark 0 or dotted line with mark the parts list may be different from the they are seldom required for routine service.
  • Page 44 HCD-GX25 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 6-500-335-01 DIODE MC2838 < TRANSISTOR > 6-500-334-01 DIODE MC2836 6-500-335-01 DIODE MC2838 6-550-289-01 TRANSISTOR 2SA1235F 8-719-988-61 DIODE 1SS355TE-17 8-729-120-28 TRANSISTOR 2SC1623-L5L6 8-719-988-61 DIODE 1SS355TE-17 8-729-120-28 TRANSISTOR 2SC1623-L5L6...
  • Page 45 HCD-GX25 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 1-216-821-11 METAL CHIP 1/10W 1-216-236-11 RES-CHIP 1/8W 1-216-821-11 METAL CHIP 1/10W 1-216-238-11 RES-CHIP 1/8W 1-216-830-11 METAL CHIP 5.6K 1/10W 1-216-825-11 METAL CHIP 2.2K 1/10W 1-216-206-00 RES-CHIP 2.2K...
  • Page 46 HCD-GX25 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R526 1-216-821-11 METAL CHIP 1/10W R594 1-216-833-11 METAL CHIP 1/10W R527 1-216-841-11 METAL CHIP 1/10W R599 1-216-841-11 METAL CHIP 1/10W R528 1-216-841-11 METAL CHIP 1/10W R601 1-216-156-00 RES-CHIP...
  • Page 47 HCD-GX25 DRIVER Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C752 1-162-949-11 CERAMIC CHIP 47PF R747 1-216-803-11 METAL CHIP 1/10W C753 1-162-949-11 CERAMIC CHIP 47PF R751 1-216-841-11 METAL CHIP 1/10W C754 1-162-949-11 CERAMIC CHIP 47PF R752...
  • Page 48 HCD-GX25 DRIVER GAME JACK H/P JACK MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R734 1-249-433-11 CARBON 1/4W C231 1-162-949-11 CERAMIC CHIP 47PF R735 1-247-807-31 CARBON 1/4W C232 1-126-947-11 ELECT 47uF R751 1-249-425-11 CARBON 4.7K...
  • Page 49 HCD-GX25 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C333 1-130-493-00 MYLAR 0.068uF < DIODE > C334 1-130-493-00 MYLAR 0.068uF C337 1-126-964-11 ELECT 10uF D102 6-500-522-21 DIODE 10EDB40-TB3 C339 1-126-934-11 ELECT 220uF D203 8-719-988-61 DIODE 1SS355TE-17...
  • Page 50 HCD-GX25 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark Q212 8-729-120-28 TRANSISTOR 2SC1623-L5L6 R265 1-216-829-11 METAL CHIP 4.7K 1/10W Q218 8-729-120-28 TRANSISTOR 2SC1623-L5L6 R266 1-216-829-11 METAL CHIP 4.7K 1/10W Q219 8-729-120-28 TRANSISTOR 2SC1623-L5L6 R267 1-216-829-11 METAL CHIP 4.7K...
  • Page 51 HCD-GX25 MAIN MOTOR (LD) MOTOR (TB) PANEL Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R378 1-216-833-11 METAL CHIP 1/10W 1-687-134-11 MOTOR (TB) BOARD R379 1-216-825-11 METAL CHIP 2.2K 1/10W ***************** R380 1-216-853-11 METAL CHIP 470K...
  • Page 52 HCD-GX25 PANEL Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark D616 8-719-988-61 DIODE 1SS355TE-17 Q610 8-729-120-28 TRANSISTOR 2SC1623-L5L6 D617 8-719-988-61 DIODE 1SS355TE-17 Q616 8-729-140-04 TRANSISTOR 2SB1116A-L D618 8-719-988-61 DIODE 1SS355TE-17 Q617 8-729-140-04 TRANSISTOR 2SB1116A-L D619 8-719-988-61 DIODE 1SS355TE-17...
  • Page 53 HCD-GX25 PANEL Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R086 1-216-841-11 METAL CHIP 1/10W R668 1-216-809-11 METAL CHIP 1/10W R087 1-216-820-11 METAL CHIP 1/10W R669 1-216-823-11 METAL CHIP 1.5K 1/10W R088 1-216-820-11 METAL CHIP 1/10W...
  • Page 54 HCD-GX25 PANEL REMOTE SENSOR TRANS VIDEO OUT Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R938 1-216-198-11 RES-CHIP 1/8W 1-687-132-11 SENSOR BOARD R939 1-216-198-11 RES-CHIP 1/8W ************** R940 1-216-198-11 RES-CHIP 1/8W < CONNECTOR > < VIBRATOR >...
  • Page 55 HCD-GX25 1 STREAM LED Ref. No. Part No. Description Remark 1 STREAM LED BOARD ******************* < DIODE > LED611 8-719-085-06 LED HL-30805Q2IT (1 STREAM) < RESISTOR > R052 1-216-182-00 RES-CHIP 1/8W ************************************************************* MISCELLANEOUS *************** 1-796-485-51 DECK, MECHANICAL 1-769-939-11 WIRE (FLAT TYPE) (11 CORE)
  • Page 56 HCD-GX25 REVISION HISTORY Clicking the version allows you to jump to the revised page. Also, clicking the version at the upper on the revised page allows you to jump to the next revised page. Ver. Date Description of Revision 2003. 03...

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