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Canadian Model AEP Model UK Model HCD-BX7 E Model HCD-DX7/DX7J Australian Model HCD-DX7 HCD-BX7/DX7/DX7J is the tuner, deck, CD and amplifier section in MHC-BX7/DX7/DX7J. Photo: HCD-DX7 Model Name Using Similar Mechanism CD Mechanism Type CDM58-K2BD38 SECTION Base Unit Type BU-K2BD38...
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SAFETY CHECK-OUT (US model only) After correcting the original service problem, perform the following safety checks before releasing the set to the customer: Check the antenna terminals, metal trim, “metallized” knobs, screws, and all other exposed metal parts for AC leakage. Check leakage as described below.
TABLE OF CONTENTS NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT 1. SERVICE NOTE ······························································· 4 The laser diode in the optical pick-up block may suffer electrostatic 2. GENERAL ·········································································· 5 break-down because of the potential difference generated by the charged electrostatic load, etc.
SECTION 1 SERVICE NOTE Note for installing the panel board 2 Panel board Hot melt Screw hole 1 Cut the eleven melted-connection points with a cutting plier. Attach the panel board with six screws (+BVTP 2.6 × 8 ) after the board is removed once. Do not tighten the screws excessively.
SECTION 3 DISASSEMBY Note : Follow the disassembly procedure in the numerical order given. 9Two screws (+BVTP 3 × 10) Upper case (Top) 3-1. UPPER CASE (TOP) 5Two screws (Case) 7Two screws (+BVTP 3 × 10) Claw Side panel R Side panel L 6Screw (Case) 3Two screws...
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3-9. BASE UNIT 4Two insulators Base unit 1Flat type wire (CN101) 5Two insulators 2Four screws (+PTPWH 2.6) 3-10. DRIVER BOARD, MOTOR BOARD AND ADDRESS SENSOR BOARD 9Screw (+PTPWH 2.6 × 8) 4Three screws (+BVTP 2.6 × 8) 6Motor board 7Flat type wire (CN721) 5Remove the two solderings of motor.
SECTION 4 TEST MODE [MC Cold Reset] [Change-over of MW Tuner Step between 9 kHz and • The cold reset clears all data including preset data stored in the 10 kHz] RAM to initial conditions. Execute this mode when returning •...
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[MC Test Mode] • This mode is used to check operations of the respective sections of Amplifier, Tuner, CD and Tape. Procedure: Press the ?/1 button to turn on the set. Press the three buttons of x , ENTER and DISC 3 simultaneously.
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[Aging Mode] This mode can be used for operation check of CD section and tape deck section. • If an error occurred: The aging operation stops and display status. • If no error occurs: The aging operation continues repeatedly. 1. Operating method of Aging Mode Turn on the main power and select “CD”...
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2) Operation during aging mode In the aging mode, the program is executed in the following sequence. (1) The disc tray opens and closes. (2) The mechanism accesses DISC 2 and makes an attempt to read TOC. However, since there are no discs, a message “CD2 NO DISC”...
SECTION 5 SECTION 6 MECHANICAL ADJUSTMENTS ELECTRICAL ADJUSTMENTS Precaution DECK SECTION 0 dB=0.775 V 1. Clean the following parts with a denatured alcohol-moistened swab: 1. Demagnetize the record/playback head with a head record/playback heads pinch rollers demagnetizer. erase head rubber belts 2.
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2. Turn the adjustment screw and check output peaks. If the peaks DECK B Tape Speed Adjustment do not match for L-CH and R-CH, turn the adjustment screw Note: Start the Tape Speed adjustment as below after setting to the test so that outputs match within 1dB of peak.
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DECK B REC Bias Adjustment 4. Mode: Record Procedure: INTRODUCTION MD/VIDEO (AUDIO) IN When set to the test mode performed in Tape Speed Adjustment, 315 Hz, 50 mV (–23.8 dB) AF OSC when the tape is rewound after recording, the “REC memory mode” blank tape 600 Ω...
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FM Tuned Level Adjustment CD SECTION FM RF SSG Note : 1. CD Block is basically designed to operate without adjustment. 75 Ω coaxial Therefore, check each item in order given. 2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated. 3. Use an oscilloscope with more than 10MΩ impedance. 4.
HCD-BX7/DX7/DX7J SECTION 7 DIAGRAMS 7-1. CIRCUIT BOARD LOCATION THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS. (In addition to this, the necessary note is printed in each block.) MOTOR Board DRIVER Board Note on Schematic Diagram: Note on Printed Wiring Boards: •...
HCD-BX7/DX7/DX7J 7-2. BLOCK DIAGRAMS DX7,DX7J MODEL AM/FM IF MPX TM601 LPF601 FE601 Q602 IC601 – TUNER/CD SECTION – CF601 CF602 RF IF BUFFER L-CH • RCH is omitted ANT IN IF OUT FM IF L OUT Q611 • Signal Path FM 75Ω...
HCD-BX7/DX7/DX7J 7-4. SCHEMATIC DIAGRAM – BD SECTION – • See page 21 for Wavefoms. • See page 46 for IC Block Diagrams. (Page 29) The components identified by Les composants identifiés par mark 0 or dotted line with mark une marque 0 sont critiques 0 are critical for safety.
HCD-BX7/DX7/DX7J 7-7. SCHEMATIC DIAGRAM – MAIN (2/3) SECTION – • See page 21 for Wavefoms. • See page 44 for IC Pin Function Description. • See page 48 for IC Block Diagrams. (Page 29) (Page 29) (Page 29) DX7, DX7J MODEL...
HCD-BX7/DX7/DX7J 7-10. SCHEMATIC DIAGRAM – POWER AMP SECTION – (BX7 MODEL) (Page 41) (Page 41) The components identified by Les composants identifiés par mark 0 or dotted line with mark une marque 0 sont critiques 0 are critical for safety.
HCD-BX7/DX7/DX7J 7-14. SCHEMATIC DIAGRAM – PANEL SECTION – • See page 21 for Wavefoms. • See page 45 for IC Pin Function Description. • See page 47 for IC Block Diagrams. EA, DX7J MODEL FUNCTION R737 (Page 29) 47k : EA, DX7J...
HCD-BX7/DX7/DX7J 7-24. IC PIN FUNCTION DESCRIPTION • MAIN BOARD IC401 M30622MAA-A25FP (MASTER CONTROL) Pin No. Pin Name Description Pin No. Pin Name Description SURROUND 1 Not used. Not used. SURROUND 2 Not used. Not used. SURROUND 3 Not used. Not used.
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• PANEL BOARD • PANEL BOARD IC601 TMP88CP77F-1A22 (DISPLAY CONTROL) IC601 TMP88CP77F-1A22 (DISPLAY CONTROL) Pin No. Pin No. Pin Name Pin Name Description Description VOLUME A VOLUME A VOLUME A signal input. VOLUME A signal input. VOLUME B VOLUME B VOLUME B signal input.
SECTION 8 EXPLODED VIEWS NOTE: • -XX, -X mean standardized parts, so they may • Abbreviation The components identified by mark 0 or have some differences from the original one. CND: Canadian model dotted line with mark 0 are critical for safety. •...
8-3. MAIN BOARD SECTION US, CND not supplied UK,G E2,MX,TH EA,MY,SP G,CIS,AEP,EA,MY,SP not supplied The components identified by Les composants identifiés par mark 0 or dotted line with mark une marque 0 sont critiques 0 are critical for safety. pour la sécurité. Replace only with part number Ne les remplacer que par une specified.
8-4. TAPE MECHANISM DECK SECTION Note: Two different types of tape mechanism are used depending on models. They maintain compatibility as an entire mechanism even though there are some different parts are used. Ref. No. Part No. Description Remarks Ref. No. Part No.
SECTION 9 ELECTRICAL PARTS LIST NOTE: Ref. No. • Due to standardization, replacements in the Part No. Description • COILS Remarks Ref. No. Part No. Description Remarks When indicating parts by reference number, parts list may be different from the parts uH: µH please include the board name.
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CD SWITCH DRIVER HEAD (A) HEAD (B) LEAF SW Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks R158 1-216-111-00 METAL CHIP 390K 1/10W S645 1-762-875-21 SWITCH, KEYBOARD (DISC 3) R159 1-216-101-00 METAL CHIP 150K 1/10W S646 1-762-875-21 SWITCH, KEYBOARD (OPEN/CLOSE) R162 1-216-101-00 METAL CHIP...