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SERVICE MANUAL
Ver 1.1 2002. 11
HCD-EP303 is the amplifler, CD
player, tape deck and tuner section in
CMT-EP303.
Amplifier section
AUDIO POWER SPECIFICATIONS:
(U.S.A. model only)
POWER OUTPUT AND TOTAL
HARMONIC DISTORTION:
with 4 Ω loads both channels driven, from 120
- 10,000 Hz; rates 6 W per channel minimum
RMS power, with no more than 10% total
harmonic distortion from 250 mW to rated
output.
Canadian model:
Continuous RMS power output (reference)
European model:
DIN power output (rated) 4.5 + 4.5 W
Continuous RMS power output (reference)
Music power output (reference)
Other model:
The following measured at AC 230 V or AC 120 V,
50/60 Hz
DIN power output (rated) 4.5 + 4.5 W
Continuous RMS power output (reference)
Outputs
PHONES:
(stereo mini jack)
SPEAKER:
Sony Corporation
9-873-621-02
2002K1600-1
Home Audio Company
© 2002.11
Published by Sony Engineering Corporation
HCD-EP303
CD
SECTION
TAPE DECK
SECTION
SPECIFICATIONS
6 + 6 W
(4 Ω at 1 kHz, 10% THD)
(4 Ω at 1 kHz, DIN)
6 + 6 W
(4 Ω at 1 kHz, 10% THD)
13 + 13 W
(4 Ω at 1 kHz, DIN)
6 + 6 W
(4 Ω at 1 kHz, 10% THD)
Accepts headphones of
8 Ω or more
COMPACT DISC DECK RECEIVER
Accepts impedance of 4 to
16 Ω
Canadian Model
Australian Model
Model Name Using Similar Mechanism
CD Mechanism Type
Model Name Using Similar Mechanism
Tape Transport Mechanism Type
CD player section
System
Compact disc and digital
audio system
Laser
Semiconductor laser
(λ=780 nm)
Emission duration:
continuous
Frequency response
20 Hz - 20 kHz (±0.5 dB)
Tape player section
Recording system
4-track 2-channel stereo
Frequency response
50 - 13 000 Hz (±3 dB),
using Sony TYPE I
cassette
US Model
AEP Model
UK Model
E Model
HCD-EP30/EP40
CS-21SC-1280
HCD-EP30/EP40
TCM125-2
— Continued on next page —

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Table of Contents

   Summary of Contents for Sony HCD-EP303

  • Page 1 US Model Canadian Model Ver 1.1 2002. 11 AEP Model UK Model E Model Australian Model HCD-EP303 is the amplifler, CD player, tape deck and tuner section in CMT-EP303. Model Name Using Similar Mechanism HCD-EP30/EP40 SECTION CD Mechanism Type CS-21SC-1280...
  • Page 2: Table Of Contents

    HCD-EP303 TABLE OF CONTENTS 1. SERVICING NOTES Tuner section ······················································ 4 FM stereo, FM/AM superheterodyne tuner 2. GENERAL ·········································································· 5 FM tuner section Tuning range 87.5 - 108.0 MHz Antenna FM lead antenna 3. DISASSEMBLY ································································ 7 Intermediate frequency 10.7 MHz 3-1.
  • Page 3: Leakage Test

    CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS REMPLACER CES COMPOSANTS QUE PAR DES PIÈSES SONY APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU PUBLISHED BY SONY.
  • Page 4: Servicing Notes

    HCD-EP303 SECTION 1 SERVICING NOTES • MODEL IDENTIFICATION NOTES ON HANDLING THE OPTICAL PICK-UP – Bottom View – BLOCK OR BASE UNIT The laser diode in the optical pick-up block may suffer electrostatic break-down because of the potential difference generated by the charged electrostatic load, etc.
  • Page 5: General

    HCD-EP303 SECTION 2 GENERAL This section is extracted from instruction manual. Main unit ALPHABETICAL ORDER BUTTON DESCRIPTIONS @/1 (power) R – Z A – P Remote sensor q; Cassette compartment qd (12) CD 4 (8, 9, 13) REPEAT .m /M> (go back/go...
  • Page 6: Remote Control

    HCD-EP303 Remote control ALPHABETICAL ORDER BUTTON DESCRIPTIONS m (rewind) M (fast forward) R – Z A – P qg (8) REPEAT CD/REMAIN (7, 8, 9, 13, 15, . (go back) > (go forward) SHUFFLE qg (8, 9) CLOCK/TIMER + (7, 14, 15)
  • Page 7: Disassembly

    HCD-EP303 SECTION 3 DISASSEMBLY • The equipment can be removed using the following procedure. 3-1. FRONT PANEL SECTION 3-8. CASSETE LID (Page 7) (Page 11) 3-4. POWER BOARD, 3-2. MAIN BOARD 3-6. CD CABINET SECTION POWER TRANSFORMER (Page 8) (Page 10) (Page 9) 3-3.
  • Page 8: Main Board

    HCD-EP303 3-2. MAIN Board 0 MAIN board 7 screw (+BTP2.6 × 8) 2 connector (CN101) 1 connector (CN204) 4 connector (CN302) 3 connector (CN301) 5 connector (CN201) 8 claw 6 connector (CN202) 3-3. Tape Mechanism Deck (TCM125-2) 2 two screws 1 connector (+BTP2.6 ×...
  • Page 9: Power Board, Power Transformer

    HCD-EP303 3-4. POWER Board, Power Transformer rear cabinet assy 2 ac cord holder 1 screw (+BVTP3 × 10) q; power pwb mounting bkt 3 screw (+BVTP3 × 10) 7 Remove four solderings. 4 four screws (+BVTP3 × 12) 9 screw (+BTP2.6 ×...
  • Page 10: Cd Cabinet Section

    HCD-EP303 3-6. CD Cabinet Section 2 CD cabinet section 1 two screws (+BTP2.6 × 8) 3-7. CD Mechanism Deck (CS-21SC-1280) 8 vibration proof rubber 7 two spring clamps (orange) 9 CD mechanism deck (CS-21SC-1280) 7 two spring clamps 8 vibration proof rubber...
  • Page 11: Cassette Lid

    HCD-EP303 3-8. Cassette Lid 3 claw 1 Push stop/eject key. 3 claw 4 cassette lid...
  • Page 12: Mechanical Adjustments

    HCD-EP303 SECTION 4 SECTION 5 MECHANICAL ADJUSTMENTS ELECTRICAL ADJUSTMENTS PRECAUTION PRECAUTION Clean the following parts with a denatured-alcohol-moistened Setting swab : MEGA BASS switch : OFF record/playback head pinch roller erase head rubber belts TAPE DECK SECTION 0 dB=0.775 V...
  • Page 13 HCD-EP303 Tape Speed Adjustment Adjustment Location: Record/Playback Head. Setting: Function: TAPE test tape WS-48A frequency counter (3 kHz, 0 dB) 32 Ω – HEADPHONE board PHONES jack (JK401) Procedure: Playback WS-48A (tape center) in the FWD state. Adjsut the volume in CAPSTAN/REEL motor (M201) so that the frequency counter reading becomes 3,000 Hz.
  • Page 14 HCD-EP303 TUNER SECTION 0 dB=1 µV no mark : Except AEP, UK models < > : AEP, UK models [AM] AM FREQUENCY COVERAGE ADJUSTMENT Setting: Adjustment Part Frequency Display Reading on Digital Voltmeter Function : TUNER 530 kHz Band switch : AM Confirmation 1.5 ±...
  • Page 15 HCD-EP303 Adjustment Location and Connecting Points – MAIN BOARD (Component Side) – T102 FM Tracking TC101 AM Frequency Coverage Adjustment Adjustment L103 AM Tracking L110 Adjustment TC102 L104 FM Frequency Coverage Adjustment – MAIN BOARD (Conductor Side) – TP11 TP10...
  • Page 16: Diagrams

    HCD-EP303 SECTION 6 DIAGRAMS 6-1. Circuit Boards Location MAIN board LED board HEADPHONE board POWER board DISPLAY board CASSETTE board...
  • Page 17 HCD-EP303 Note on Printed Wiring Board: Note on Schematic Diagram: • WAVEFORMS • W : indicates side identified with part number. • All capacitors are in µF unless otherwise noted. p: pF. – MAIN Board – – CASSETTE Board –...
  • Page 18: Block Diagrams

    HCD-EP303 6-2. Block Diagrams TUNER/TAPE DECK Section AM TRACKING IC101 TC102 L110 AM/FM IF AMP, AM ANT TUNER AMRF MIX, MPX, DET, OSC L-CH AMP SECTION T103 F102 D105 T102 ANT1 AM MIX AM IF X101 AM FREQUENCY AM OSC 10.7MHz...
  • Page 19 HCD-EP303 AMP Section JK401 PHONES IC203 FUNCTION SELECT SWITCH, ELECTRONIC VOLUME TUNER TUNER L-CH LVROUT SECTION TUNER IC301 POWER AMP R-CH LVRIN TAPE D332 TAPE SECTION Q206 SPK301 MEGA BASS CD L D333 – LTOUT SPEAKER R-CH Q301,302 (IMPEDANCE MUTING –...
  • Page 20 HCD-EP303 DISPLAY/POWER Section IC601 (3/3) SYSTEM CONTROLLER, LIQUID CRYSTAL DISPLAY DRIVER 69-80, ı 1 -20 LD621 LIQUID CRYSTAL DISPLAY COM0 ı 21-24 COM3 SW601 - 615, 621, 622 KEY R0 KEY MATRIX 64-67 ı TR401 KEY R3 POWER TRANSFORMER DC_12V...
  • Page 21: Printed Wiring Board Main Section

    HCD-EP303 6-3. Printed Wiring Board MAIN Section • See page 16 for Circuit Boards Location. L110 AM FERRITE-ROD ANTENNA MAIN BOARD • Semiconductor Location Ref. No. Location D101 D102 ANT1 D103 IC101 D104 D105 D306 TP10 TP11(AMVT) D307 (FMVT) D308...
  • Page 22: Schematic Diagram Mian Section (1/2)

    HCD-EP303 6-4. Schematic Diagram MIAN Section (1/2) • See page 17 for Waveforms. • See page 29 for IC Block Diagrams. MAIN BOARD (1/2) TP10 (FM VT) R148 5.6k R112 C148 3.3k 2.2u L103, TC101 C105 C151 0.001 FM TRACKING C147 0.01...
  • Page 23: Schematic Diagram Mian Section (2/2)

    HCD-EP303 6-5. Schematic Diagram MIAN Section (2/2) • See page 30 for IC Block Diagrams. DISPLAY DISPLAY MAIN BOARD (Page 26) (Page 26) (1/2) BOARD BOARD (Page 22) * CD * SUPPLIED AS THE ASSEMBLED BLOCK BLOCK HEADPHONE BOARD MAIN BOARD...
  • Page 24: Printed Wiring Board Cassette Section

    HCD-EP303 6-6. Printed Wiring Board CASSETTE Section • See page 16 for Circuit Boards Location. 6-7. Schematic Diagram CASSETTE Section • See page 17 for Waveforms. • See page 30 for IC Block Diagrams. CASSETTE BOARD CASSETTE BOARD SW701 (5/6)
  • Page 25: Printed Wiring Board Display Section

    HCD-EP303 6-8. Printed Wiring Board DISPLAY Section • See page 16 for Circuit Boards Location. DISPLAY BOARD • Semiconductor Location LIQUID CRYSTAL DISPLAY IC603 Ref. No. Location MEGA BASS D601 TIMER D602 D603 IC601 D607 D608 REM601 D609 D610 D611...
  • Page 26: Schematic Diagram Display Section

    HCD-EP303 6-9. Schematic Diagram DISPLAY Section • See page 17 for Waveforms. DISPLAY BOARD LD621 LIQUID CRYSTAL DISPLAY TIMER SEL2215S-CD IC603 TAPE TUNER RESET SIGNAL 2.7k GENERATOR COM0 VOLUME + COM1 COM2 MUSIC MENU PST529D COM3 BIAS VOLUME - VLC0...
  • Page 27: Printed Wiring Board Power Section

    HCD-EP303 6-10. Printed Wiring Board POWER Section • See page 16 for Circuit Boards Location. POWER BOARD • Semiconductor Location Ref. No. Location D401 D402 D403 D404 D405 D406 D407 D408 D409 D411 D412 TR401 D413 POWER D414 TRANSFORMER Q401...
  • Page 28: Schematic Diagram Power Section

    HCD-EP303 6-11. Schematic Diagram POWER Section POWER BOARD 82 1/4W :EXCEPT US CND, MX 10 1/4W :US CND, MX TR402 C410 680p 250V POWER TRANSFORMER 510 : EXCEPT US,CND,MX 180 : US,CND,MX RL401 120V :EXCEPT US,CND,MX 250V :US,CND,MX C401 MTZJ-6.8B 2.2k...
  • Page 29 HCD-EP303 • IC Block Diagrams – MAIN Board – IC101 LA1823 GND2 VCC2 MUTE PHASE PILOT DECODER COMP ST SW TRIG S-METER BUFFER BUFFER VCC1 GND1 IC102 LC72131 PHASE DETECTOR CHARGE PUMP POWER REFERENCE UNLOCK DIVIDER DETECTOR RESET SWALLOW COUNTER...
  • Page 30 HCD-EP303 IC203 LC75392 LVROUT RVROUT LVRIN RVRIN LTOUT RTOUT – LTCOM RTCOM LATCH DECODER SHIFT REGISTER VREF CONTROL – CASSETTE Board – IC701 AN7312 RIPPLE FILTER AMP. CH2 AMP. CH1...
  • Page 31: Ic Pin Function Description

    HCD-EP303 6-12. IC Pin Function Description • IC601 µPD753016AGC-F37-3B9 SYSTEM CONTROLLER, LIQUID CRYSTAL DISPLAY DRIVER (DISPLAY BOARD) Pin No. Pin Name Description 1 to 20 S12 to S31 Segment drive signal output to the liquid crystal display (LD621) 21 to 24...
  • Page 32: Exploded Views

    HCD-EP303 SECTION 7 EXPLODED VIEWS NOTE: • -XX, -X mean standardized parts, so they may • The mechanical parts with no reference number The components identified by mark 0 or have some differences from the original one. in the exploded views are not supplied.
  • Page 33: Front Panel Section -1

    HCD-EP303 Ver 1.1 2002.11 7-2. Front Panel Section -1 not supplied not supplied not supplied Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks 4-240-260-01 VOLUME SWING KNOB 4-240-264-01 CASS KEY (FF) 4-240-256-01 VOLUME SWING SHAFT 4-240-265-01 CASS KEY (REW)
  • Page 34: Front Panel Section -2

    HCD-EP303 7-3. Front Panel Section -2 121 123 supplied not supplied LD621 Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks 4-235-995-01 RUBBER FOOT 4-240-268-01 DISPLAY/POWER KNOB 4-240-273-01 FRONT PANEL (EXCEPT US,CND) 4-240-272-01 FUNCTION KNOB 4-241-641-01 FRONT PANEL (US,CND)
  • Page 35: Cd Cabinet Section

    HCD-EP303 7-4. CD Cabinet Section SW600 Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks 4-240-255-01 CD COVER HOUSING 4-241-494-01 CD TRAY (US,CND) 4-236-280-01 RUBBER, VIBRATION PROOF (PINK) 4-235-949-01 PU COVER 4-235-991-01 PULLEY SCREW 1-796-189-11 MECH, CD...
  • Page 36: Electrical Parts List

    HCD-EP303 SECTION 8 CASSETTE ELECTRICAL PARTS LIST NOTE: • Due to standardization, replacements in the • RESISTORS When indicating parts by reference number, parts list may be different from the parts All resistors are in ohms. please include the board name.
  • Page 37 HCD-EP303 CASSETTE DISPLAY Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks < SWITCH > < IC > SW701 1-786-225-11 SWITCH, PUSH (1 KEY) (REC/PB) IC601 6-800-412-01 IC uPD753016AGC-F37 IC602 8-759-009-22 IC TC4094BF < COIL > IC603...
  • Page 38 HCD-EP303 DISPLAY HEADPHONE MAIN Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks R643 1-249-433-11 CARBON 1/4W LED BOARD, COMPLETE R644 1-249-433-11 CARBON 1/4W (included DISPLAY BOARD, COMPLETE) R645 1-249-437-11 CARBON 1/4W ************************************** R646 1-249-437-11 CARBON 1/4W...
  • Page 39 HCD-EP303 MAIN Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks C147 1-162-306-11 CERAMIC 0.01uF 30.00% 16V C251 1-127-872-11 CERAMIC 4700PF C148 1-126-961-11 ELECT 2.2uF 20.00% 50V C301 1-130-471-00 MYLAR 0.001uF C150 1-126-935-11 ELECT 470uF 20.00% 10V...
  • Page 40 HCD-EP303 MAIN Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks D331 8-719-991-33 DIODE 1N4148TP R116 1-249-437-11 CARBON 1/4W D332 8-719-991-33 DIODE 1N4148TP R117 1-249-441-11 CARBON 100K 1/4W D333 8-719-991-33 DIODE 1N4148TP R118 1-247-843-11 CARBON 3.3K 1/4W...
  • Page 41 HCD-EP303 MAIN POWER Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks R233 1-249-437-11 CARBON 1/4W R344 1-249-421-11 CARBON 2.2K 1/4W F R234 1-249-427-11 CARBON 6.8K 1/4W F R345 1-249-402-11 CARBON 1/4W R239 1-249-428-11 CARBON 8.2K 1/4W F...
  • Page 42 HCD-EP303 Ver 1.1 2002.11 POWER Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks < DIODE > MISCELLANEOUS ************* D401 8-719-077-63 DIODE 1N5402 1-500-712-11 CORE, FERRITE (AEP,UK) D402 8-719-077-63 DIODE 1N5402 1-555-750-00 CORD, POWER (AEP,E51,MY,SP) D403 8-719-077-63 DIODE 1N5402...
  • Page 43 HCD-EP303 MEMO...
  • Page 44 HCD-EP303 REVISION HISTORY Clicking the version allows you to jump to the revised page. Also, clicking the version at the upper right on the revised page allows you to jump to the next revised page. Ver. Date Description of Revision 2002.03...

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