Sony hcd m 70 service manual

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2 HCD-M70 SAFETY CHECK-OUT After correcting the original service problem, perform the follow- ing safety check 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. LEAKAGE TEST The AC leakage from any exposed metal part to earth ground and from all exposed metal parts to any exposed metal part having a r eturn to chassis, must not exceed 0.5 mA (500 microamperes.). Leakage current can be measured by any one of three methods. 1. A commercial leakage tester, such as the Simpson 229 or RCA WT-540A. Follow the manufacturers instructions to use these instruments. 2. A battery-operated AC milliammeter. The Data Precision 245 digital multimeter is suitable for this job. 3. Measuring the voltage drop across a resistor by means of a VOM or battery-operated AC voltmeter. The limit indication is 0.75 V, so analog meters must have an accurate low-voltage scale. The Simpson 250 and Sanwa SH-63Trd are examples of a pas- sive VOM that is suitable. Nearly all battery operated digital m ultimeters that have a 2 V AC range are suitable. (See Fig. A) Fig. A. Using an AC voltmeter to check AC leakage. 1.5 k -�� 0.15 µF AC voltmete r (0.75 V) To Exposed Metal Parts on Set Earth Ground A TTENTION AU COMPOSANT AYANT RAPPORT �- LA SÉCURITÉ! LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE 0 SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE REMPLACER CES COM- POSANTS QUE PAR DES PIÈCES SONY DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU D ANS LES SUPPLÉMENTS PUBLIÉS PAR SONY. SAFETY-RELATED COMPONENT WARNING!! 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 PUB- LISHED BY SONY. General Power requirements North American model: 120 V AC, 60 Hz European model: 230 V AC, 50/60 Hz Mexican model: 120 V AC, 60 Hz Australian model: 230 V AC, 50/60 Hz Thailand model: 220 V AC, 50/60 Hz Other models: 110 - 120 V or 220 - 240 V AC, 50/60 Hz Adjustable with voltage selector Power consumption European model: See the nameplate 0.5 W (in the standby mode) Other models: See the nameplate Dimensions (w/h/d) Approx. 159 × 217 × 315 mm incl. projecting parts and controls Mass Approx. 4.5 kg Design and specifications are subject to change without notice. Other models: 530 - 1,710 kHz (with the tuning interval set at 10 kHz) 531 - 1,602 kHz (with the tuning interval set at 9 kHz) Antenna AM loop antenna, external antenna terminal Intermediate frequency 450 kHz

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3 HCD-M70 CAUTION Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous ra- diation exposure. This appliance is classified as a CLASS 1 LASER product. The CLASS 1 LASER PRODUCT MARKING is located on the rear exterior. Laser component in this product is capable of emitting radiation exceeding the limit for Class 1. T he following caution label is located inside the unit. CAUTION : INVISIBLE LASER RADIATION WHEN OPEN AND INTERLOCKS DEFEATED. AVOID EXPOSURE TO BEAM. ADVARSEL : USYNLIG LASERSTRÅLING VED ÅBNING NÅR SIKKERHEDSAFBRYDERE ER UDE AF FUNKTION. UNDGÅ UDSAETTELSE FOR STRÅLING. V ORSICHT : UNSICHTBARE LASERSTRAHLUNG, WENN ABDECKUNG GEÖFFNET UND SICHEREITSVERRIEGELUNG ÜBERBRÜCKT. NICHT DEM STRAHL AUSSETZEN. VA R O ! : AVATTAESSA JA SUOJALUKITUS OHITETTAESSA OLET ALT- TIINA NÄKYMÄTTÖMÄLLE LASERSÄTEILYLLE. ÄLÄ KATSO SÄTEESEEN. V ARNING : OSYNLING LASERSTRÅLING NÄR DENNA DEL ÄR ÖPPNAD OCH SPÄRREN ÄR URKOPPLAD. BETRAKTA EJ STRÅLEN. ADVERSEL : USYNLIG LASERSTRÅLING NÅR DEKSEL ÅPNES OG SIKKERHEDSLÅS BRYTES. UNNGÅ EKSPONERING FOR STRÅLEN. VIGYAZAT !: A BURKOLAT NYITÁSAKOR LÁTH ATATLAN LÉZERSU- GÁRVESZÉLY ! KERÜLJE A BESUGÁRZÁST ! Notes on chip component replacement -N ever reuse a disconnected chip component. - Notice that the minus side of a tantalum capacitor may be dam- aged by heat. Flexible Circuit Board Repairing -K eep the temperature of the soldering iron around 270 ˚C dur- ing repairing. - Do not touch the soldering iron on the same conductor of the circuit board (within 3 times). - Be careful not to apply force on the conductor when soldering or unsoldering. TABLE OF CONTENTS 1. SERVICING NOTES ............................................... 4 2. GENERAL ................................................................... 5 3. DISASSEMBLY 3-1. Disassembly Flow........................................................... 6 3-2. Panel (Side) (L), Panel (Side) (R) .................................. 7 3-3. Top P anel Section ............................................................ 7 3-4. Mechanical Deck (Tape)................................................. 8 3-5. Front P anel Section......................................................... 8 3-6. Back P anel Assy.............................................................. 9 3-7. MAIN Board ................................................................... 9 3-8. CD Mechanism Deck (CDM55F-K6BD41A)................ 10 3-9. Base Unit (B U-K6BD41A)............................................. 11 3-10. Loading Board ................................................................. 11 3-11. Cam (CDM55) ................................................................ 12 4. TEST MODE .............................................................. 13 5. ELECTRICAL ADJUSTMENTS Deck Section................................................................... 13 CD Section ...................................................................... 13 6. DIAGRAMS 6-1. Block Diagram -� CD SERVO Section -�....................... 14 6-2. Block Diagram -� TUNER/TAPE DECK Section -�...... 15 6-3. Block Diagram -� MAIN Section -�................................ 16 6-4. Note for Printed Wiring Boards and Schematic Diagrams ....................................................... 17 6-5. Printed Wiring Board -� CD Board -�............................. 18 6-6. Schematic Diagram -� CD Board -�................................ 19 6-7. Printed Wiring Board -� TC Board -�.............................. 20 6-8. Schematic Diagram -� TC Board -�................................. 21 6-9. Schematic Diagram -� MAIN Board (1/2) -�.................. 22 6-10. Schematic Diagram -� MAIN (2/2)/JACK Boards -� ...... 23 6-11. Printed Wiring Boards -� MAIN/JACK Boards -�.......... 24 6-12. Printed Wiring Boards -� CONTROL/LOADING/VIDEO Boar ds -�.................. 26 6-13. Schematic Diagram -� CONTROL/LOADING/ SWITCH (1/2)/VIDEO Boards -�................................... 27 6-14. Printed Wiring Board -� SWITCH Board -�................... 28 6-15. Schematic Diagram -� SWITCH Board (2/2) -�............. 29 6-16. Printed Wiring Board -� POWER Board -�..................... 30 6-17. Schematic Diagram -� POWER Board -�........................ 31 6-18. IC Pin Function Description........................................... 34 7. EXPLODED VIEWS 7-1. Panel (Side) Section........................................................ 36 7-2. Front P anel Section......................................................... 37 7-3. Top P anel Section ............................................................ 38 7-4. Chassis Section-1 ............................................................ 39 7-5. Chassis Section-2 ............................................................ 40 7-6. CD Mechanism Deck (CDM55F-K6BD41A)................ 41 7-7. Base Unit (B U-K6BD41A)............................................. 42 8. ELECTRICAL PARTS LIST ............................... 43