Sony cx js 7 service manual

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CX-JS7 2 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 -K eep 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. CAUTION Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous ra- diation exposure. 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. 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 T he 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 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

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CX-JS7 3 TABLE OF CONTENTS 1. SERVICING NOTES ................................................ 4 2. GENERAL Location of Controls ....................................................... 7 3. DISASSEMBLY 3-1. Disassembly Flow........................................................... 9 3-2. Case (SIDE-L/R) ............................................................. 10 3-3. Case (T op)....................................................................... 10 3-4. Tray Panel ........................................................................\ 11 3-5. CD Mechanism Deck (CDM74F-K6BD71A)................ 11 3-6. Front P anel Section......................................................... 12 3-7. Mechanical Deck ............................................................. 12 3-8. Rear Cabinet Section...................................................... 13 3-9. Main Board ...................................................................... 13 3-10. Power Board.................................................................... 14 3-11. Transformer Board.......................................................... 14 3-12 Table Assy....................................................................... 15 3-13. Motor (TB) Board........................................................... 15 3-14. Motor (LD) Board........................................................... 16 3-15. Base Unit (B U-K6BD71A)............................................. 16 3-16. Motor Gear Assy (Sled) (M701), BD Board.................. 17 3-17. Optical Pick-up (KSS-213D).......................................... 17 4. TEST MODE .............................................................. 18 5. ELECTRICAL ADJUSTMENTS CD Section...................................................................... 21 6. DIAGRAMS 6-1. Block Diagram -“ CD Section -“..................................... 22 6-2. Block Diagram -“ TUNER/TAPE/PANEL Section -“..... 23 6-3. Block Diagram -“ AMP/POWER SUPPLY Section -“ ... 24 6-4. Note for Printed Wiring Boards and Schematic Diagrams ....................................................... 25 6-5. Printed Wiring Board -“ BD Board -“............................. 26 6-6. Schematic Diagram -“ BD Board -“................................ 27 6-7. Printed Wiring Boards -“ CHANGER Section -“............ 28 6-8. Schematic Diagram -“ CHANGER Section -“................ 29 6-9. Schematic Diagram -“ MAIN Board (1/4) -“.................. 30 6-10. Schematic Diagram -“ MAIN Board (2/4) -“.................. 31 6-11. Schematic Diagram -“ MAIN Board (3/4) -“.................. 32 6-12. Schematic Diagram -“ MAIN Board (4/4) -“.................. 33 6-13. Printed Wiring Board -“ MAIN Board -“........................ 34 6-14. Printed Wiring Board -“ Power Board -“......................... 35 6-15. Schematic Diagram -“ Power Board (1/2) -“................... 36 6-16. Schematic Diagram -“ Power Board (2/2) -“................... 37 6-17. Printed Wiring Boards -“ CD BUTTON/HEADPHONE Boards -“...................... 38 6-18. Schematic Diagram -“ CD BUTTON/HEADPHONE Boards -“...................... 39 6-19. Printed Wiring Board -“ PANEL Board -“...................... 40 6-20. Schematic Diagram -“ PANEL Board -“......................... 41 6-21. Printed Wiring Board -“ TRANSFORMER Board -“ ..... 42 6-22. Schematic Diagram -“ TRANSFORMER Board -“........ 43 6-23. IC Pin Function Description........................................... 47 7. EXPLODED VIEWS 7-1. Case Section .................................................................... 53 7-2. Front P anel Section-1 ...................................................... 54 7-3. Front P anel Section-2 ...................................................... 55 7-4. Front P anel Section-3 ...................................................... 56 7-5. Front P anel Section-4 ...................................................... 57 7-6. Chassis Section-1 ............................................................ 58 7-7. Chassis Section-2 ............................................................ 59 7-8. CD Mechanism Deck Section-1 (CDM74F-K6BD71A) .................................................... 60 7-9. CD Mechanism Deck Section-2 (CDM74F-K6BD71A) .................................................... 61 7-10. CD Mechanism Deck Section-3 (CDM74F-K6BD71A) .................................................... 62 7-11. Base Unit Section (BU-K6BD71A)............................... 63 8. ELECTRICAL PARTS LIST ............................... 64