Sony hcd mg 310 av service manual

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2 HCD-MG110/MG310AV TABLE OF CONTENTS FM tuner section Tuning range 87.5 -“ 108.0 MHz Antenna FM lead antenna Antenna terminals North American model: 75 ohms unbalanced Australian model: 75 ohms balanced Intermediate frequency 10.7 MHz AM tuner section Tuning range US, Canadian and Mexican model: 530 -“ 1,710 kHz (with the interval set at 10 kHz) 531 -“ 1,710 kHz (with the interval set at 9 kHz) Australian model: 531 -“ 1,602 kHz (with the interval set at 9 kHz) Antenna AM loop antenna Antenna terminals External antenna terminal Intermediate frequency 450 kHz General Power requirements US, Canadian and Mexican model: 120 V AC, 60 Hz Australian model:220 -“ 240 V AC, 50/60 Hz Power consumption US, Canadian and Mexican model MHC-MG310AV: 200 watts MHC-MG110: 150 watts Australian model MHC-MG310AV: 200 watts Dimensions (w/h/d) incl. projecting parts and controls Approx. 280 × 383 × 480 mm Mass MHC-MG310AV: Approx. 11.3 kg MHC-MG110: Approx. 10.9 kgSupplied accessories: Remote commander (1) Batteries (2) AM loop antenna (1) FM lead antenna (1) Rear speaker cords (MG310AV only) (2) Center speaker pads (attached to the backside of the center speaker) (MG310AV only) (2) Video cable (Australian model only) (1) Design and specifications are subject to change without notice. 1. SERVICING NOTE .................................................. 4 2. GENERAL ................................................................... 5 3. DISASSEMBLY 3-1. Disassembly Flow ........................................................... 7 3-2. Upper Cover .................................................................... 8 3-3. Front Block Assy ............................................................. 8 3-4. MAIN Board ................................................................... 9 3-5. Back Panel, DC Fan (M391) (Australian model) ........... 9 3-6. MAIN AMP Board, POWER Board ............................... 10 3-7. Middle (F) Assy, Bracket (Middle-R), Power Bracket ................................................................. 10 3-8. Mechanism Deck (CDM64-K1BD44A) ......................... 11 3-9. Base Unit (BU-K1BD44A) ............................................. 11 3-10. BU Holder Assy .............................................................. 12 3-11. Motor Gear Assy (Sled) (M102), CD Board .................. 12 3-12. Op Base Assy (KSM-213BFN) ...................................... 13 3-13. Cassette Lid Assy (A)/(B) ............................................... 13 3-14. Mech Deck (TAPE) ......................................................... 14 4. TEST MODE .............................................................. 15 5. MECHANICAL ADJUSTMENTS ....................... 16 6. ELECTRICAL ADJUSTMENTS Deck Section ............................................................................. 16 CD Section ................................................................................ 18 7. DIAGRAMS 7-1. Block Diagram -“ CD SERVO Section -“........................ 21 7-2. Block Diagram -“ TUNER/TAPE DECK Section -“...... 22 7-3. Block Diagram -“ SURROUND Section -“...................... 23 7-4. Block Diagram -“ AMP Section -“................................... 24 7-5. Block Diagram -“ DISPLAY/POWER SUPPLY Section -“...................... 257-6. Note for Printed Wiring Boards and Schematic Diagrams ....................................................... 26 7-7. Schematic Diagram -“ CD Section -“............................... 28 7-8. Printed Wiring Board -“ CD Section -“............................ 29 7-9. Printed Wiring Boards -“ CD MOTOR/SENSOR Section -“................................ 30 7-10. Schematic Diagram -“ CD MOTOR/SENSOR Section -“................................ 31 7-11. Printed Wiring Board -“ TC Section -“............................. 32 7-12. Schematic Diagram -“ TC Section -“............................... 33 7-13. Schematic Diagram -“ MAIN Section (1/4) -“................. 34 7-14. Schematic Diagram -“ MAIN Section (2/4) -“................. 35 7-15. Schematic Diagram -“ MAIN Section (3/4) -“................. 36 7-16. Schematic Diagram -“ MAIN Section (4/4) -“................. 37 7-17. Printed Wiring Board -“ MAIN Section -“....................... 38 7-18. Printed Wiring Boards -“ AMP Section -“........................ 40 7-19. Schematic Diagram -“ AMP Section -“............................ 41 7-20. Printed Wiring Boards -“ DISPLAY Section -“............... 42 7-21. Schematic Diagram -“ DISPLAY Section -“.................... 43 7-22. Printed Wiring Board -“ CONTROL Section -“............... 44 7-23. Schematic Diagram -“ CONTROL Section -“.................. 45 7-24. Printed Wiring Boards -“ POWER Section -“.................. 46 7-25. Schematic Diagram -“ POWER Section -“...................... 47 7-26. IC Pin Function Description ........................................... 48 8. EXPLODED VIEWS 8-1. General Section ............................................................... 54 8-2. Front Panel Section ......................................................... 55 8-3. Chassis Section ............................................................... 56 8-4. Mechanism Deck Section (CDM64-K1BD44A) ........... 57 8-5. Base Unit Section (BU-K1BD44A) ............................... 58 9. ELECTRICAL PARTS LIST ............................... 59 Ver 1.3

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3 HCD-MG110/MG310AV 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 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 return 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 indica- tion is 0.75 V, so analog meters must have an accurate low- voltage scale. The Simpson 250 and Sanwa SH-63Trd are ex- amples of a passive VOM that is suitable. Nearly all battery operated digital multimeters that have a 2 V AC range are suitable. (See Fig. A)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. 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. The laser diode in the optical pick-up block may suffer electro- static break-down because of the potential difference generated by the charged electrostatic load, etc. on clothing and the human body. During repair, pay attention to electrostatic break-down and also use the procedure in the printed matter which is included in the repair parts. The flexible board is easily damaged and should be handled with care. NOTES ON LASER DIODE EMISSION CHECK The laser beam on this model is concentrated so as to be focused on the disc reflective surface by the objective lens in the optical pick-up block. Therefore, when checking the laser diode emis- sion, observe from more than 30 cm away from the objective lens. LASER DIODE AND FOCUS SEARCH OPERATION CHECK Carry out the S curve check in CD section adjustment and check that the S curve waveforms is output three times. NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT Notes on chip component replacement -Never reuse a disconnected chip component. -Notice that the minus side of a tantalum capacitor may be dam- aged by heat. Flexible Circuit Board Repairing -Keep the temperature of the soldering iron around 270 ËšC 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. Ver 1.1 ATTENTION AU COMPOSANT AYANT RAPPORT Ã- 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 DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.