Sony cx js 77 service manual
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CX-JS77 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 - Ke ep 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. 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. UNLEADED SOLDER Boards requiring use of unleaded solder are printed with the lead- free mark (LF) indicating the solder contains no lead. (Caution: Some printed circuit boards may not come printed with the lead free mark due to their particular size) : LEAD FREE MARK Unleaded solder has the following characteristics. - Unleaded solder melts at a temperature about 40 °C higher than ordinary solder. Ordinary soldering irons can be used but the iron tip has to be applied to the solder joint for a slightly longer time. Soldering irons using a temperature regulator should be set to about 350 °C. Caution: The printed pattern (copper foil) may peel away if the heated tip is applied for too long, so be careful! - Strong viscosity Unleaded solder is more viscou-s (sticky, less prone to flow) than ordinary solder so use caution not to let solder bridges oc- cur such as on IC pins, etc. - Usable with ordinary solder It is best to use only unleaded solder but unleaded solder may also be added to ordinary solder. 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 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 indica- tion is 0.75 V, so analog meters must have an accurate low- v oltage 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 suit- able. (See Fig. A) Fig. A. Using an AC voltmeter to check AC leakage. 1.5 k Ω 0.15 µF AC voltmete r (0.75 V) To Exposed Metal Parts on Set Earth Ground A TTENTION AU COMPOSANT AYANT RAPPORT À 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.
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CX-JS77 3 TABLE OF CONTENTS 1. SERVICING NOTES ................................................ 4 2. GENERAL Location of Controls ....................................................... 7 Setting the Clock ............................................................. 8 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 (CDM74-F1BD81)...................... 11 3-6. Front Panel Block............................................................ 12 3-7. Back P anel Section.......................................................... 12 3-8. MAIN Board ................................................................... 13 3-9. Tape Mechanism Deck (CWM43FF13)......................... 13 3-10. Table Assy....................................................................... 14 3-11. MOTOR (TB) Board....................................................... 14 3-12. MOTOR (LD) Board....................................................... 15 3-13. Base Unit (B U-F1BD81A)............................................. 15 3-14. CD Board ........................................................................\ . 16 4. TEST MODE .............................................................. 17 5. ELECTRICAL ADJUSTMENTS CD Section...................................................................... 21 6. DIAGRAMS 6-1. Block Diagram – SERVO Section –.............................. 22 6-2. Block Diagram – MAIN Section –................................ 23 6-3. Block Diagram – PANEL/POWER SUPPL Y Section –.......................... 24 6-4. Note for Printed Wiring Boards and Schematic Diagrams ....................................................... 25 6-5. Printed Wiring Board – CD Board –............................. 26 6-6. Schematic Diagram – CD Board –................................ 27 6-7. Printed Wiring Boards – CHANGER Section –............ 28 6-8. Schematic Diagram – CHANGER Section –................ 29 6-9. Printed Wiring Board – CDMP3 CONNECT Board –...................................... 30 6-10. Schematic Diagram – CDMP3 CONNECT Board –...................................... 31 6-11. Schematic Diagram – MAIN Section (1/4) –................ 32 6-12. Schematic Diagram – MAIN Section (2/4) –................ 33 6-13. Schematic Diagram – MAIN Section (3/4) –................ 34 6-14. Schematic Diagram – MAIN Section (4/4) –................ 35 6-15. Printed Wiring Boards – MAIN Section –.................... 36 6-16. Printed Wiring Board – PANEL Section –.................... 37 6-17. Schematic Diagram – PANEL Section (1/2) –.............. 38 6-18. Schematic Diagram – PANEL Section (2/2) –.............. 39 6-19. Printed Wiring Board – POWER AMP Section –......... 40 6-20. Schematic Diagram – POWER AMP Section –............ 41 6-21. Printed Wiring Boards – TRANS Section –.................. 42 6-22. Schematic Diagram – TRANS Section –...................... 43 7. EXPLODED VIEWS 7-1. Case Section .................................................................... 54 7-2. Tape Mechanism Dec k Section (CWM43FF13)............ 55 7-3. Cassette Box Section...................................................... 56 7-4. Front P anel Section......................................................... 57 7-5. Back P anel Section.......................................................... 58 7-6. Chassis Section ............................................................... 59 7-7. CD Mechanism Deck Section-1 (CDM74-F1BD81) ..... 60 7-8. CD Mechanism Deck Section-2 (CDM74-F1BD81) ..... 61 7-9. CD Mechanism Deck Section-3 (CDM74-F1BD81) ..... 62 7-10. Base Unit Section (BU-F1BD81A)................................ 63 8. ELECTRICAL PARTS LIST ............................... 64