Sony cfd g 55 service manual

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sony cfd g 55 service manual

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2 CFD-G55 Notes on chip component replacement -Never reuse a disconnected chip component. -Notice that the minus side of a tantalum capacitor may be damaged by heat. Flexible Circuit Board Repairing -Keep the temperature of soldering iron around 270˚C during 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. 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 PUBLISHED BY SONY. ATTENTION AU COMPOSANT AYANT RAPPORT À LA SÉCURITÉ! LES COMPOSANTS IDENTIFÉS PAR UNE MARQUE 0 SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS QUE PAR DES PIÈSES SONY DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU DANS LES SUPPÉMENTS PUBLIÉS PAR SONY. TABLE OF CONTENTS 1. SERVICING NOTES ······················································ 3 2. GENERAL ·········································································· 4 3. DISASSEMBLY ································································ 5 3-1. Cabinet (Front) Assy- 1 ················································· 5 3-2. Cabinet (Front) Assy- 2 ················································· 6 3-3. CONTROL (POWER), CONTROL (CD), HEADPHONE Board ··················································· 6 3-4. Panel Assy ····································································· 7 3-5. LCD Board, Panel (Upper) ··········································· 7 3-6. Panel (Upper) Assy- 1 ··················································· 8 3-7. Panel (Upper) Assy- 2 ··················································· 8 3-8. POWER, TRANS, VOL SEL Board ····························· 9 3-9. TUNER Board, Duct (Upper, Lower) ··························· 9 3-10. BATT COM, BATT Board ·········································· 10 3-11. MAIN Board- 1 ··························································· 10 3-12. MAIN Board- 2 ··························································· 11 3-13. Mechanism Deck Section (MF-V5-117) ···················· 11 3-14. CD Block Section (KSM-213RDP) ···························· 12 3-15. PDW, L-R/REG Board ················································ 12 4. ADJUSTMENTS ···························································· 13 4-1. Mechanical Adjustments ············································· 13 4-2. Electrical Adjustments ················································ 13 5. DIAGRAMS ······································································ 17 5-1. Circuit Boards Location ·············································· 17 5-2. Block Diagrams ·························································· 18 MAIN Section ····························································· 18 TUNER/CD Section ··················································· 19 5-3. Printed Wiring Board – TUNER Section – ················ 20 5-4. Schematic Diagram – TUNER Section – ··················· 21 5-5. Printed Wiring Board – CD Section – ························ 22 5-6. Schematic Diagram – CD Section – ··························· 23 5-7. Printed Wiring Board – TC Section – ························· 24 5-8. Schematic Diagram – TC Section – ···························· 24 5-9. Printed Wiring Board – MAIN Section – ··················· 25 5-10. Schematic Diagram – MAIN Section (1/2) – ············· 26 5-11. Schematic Diagram – MAIN Section (2/2) – ············· 27 5-12. Printed Wiring Board – AMP Section – ······················ 28 5-13. Schematic Diagram – AMP Section – ························ 29 5-14. Printed Wiring Board – CONTROL Section – ··········· 30 5-15. Schematic Diagram – CONTROL Section – ·············· 31 5-16. Printed Wiring Board – POWER Section – ················ 32 5-17. Schematic Diagram – POWER Section – ··················· 33 5-18. IC Pin Function Description ······································· 36 6. EXPLODED VIEWS ······················································ 38 6-1. Cabinet (Front) Section ··············································· 38 6-2. Cabinet (Rear) Section ················································ 39 6-3. Cabinet (Upper) Section ············································· 40 6-4. Mechanism Deck Section- 1 (MF-V5-117) ················ 41 6-5. Mechanism Deck Section- 2 (MF-V5-117) ················ 42 6-6. CD Mechanism Section (KSM-213RDP) ··················· 43 7. ELECTRICAL PARTS LIST ······································· 44 Ver 1.1 2002.05

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3 SAFETY CHECK-OUT 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. LEAKAGE 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 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 passive VOM that is suitable. Nearly all battery operated digital multimeters that have a 2V AC range are suitable. (See Fig. A) To Exposed Metal Parts on Set 0.15 µF 1.5 kΩAC Voltmeter (0.75 V) Earth Ground Fig. A. Using an AC voltmeter to check AC leakage. CFD-G55 SECTION 1 SERVICING NOTES NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT The laser diode in the optical pick-up block may suffer electrostatic breakdown because of the potential difference generated by the charged electrostatic load, etc. on clothing and the human body. During repair, pay attention to electrostatic breakdown 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 emission, observe more than 30 cm away from the objective lens. CHUCK PLATE JIG ON REPAIRING On repairing CD section, playing a disc without the CD lid, use Chuck Plate Jig. - Code number of Chuck Plate Jig : X-4918-255-1 LASER DIODE AND FOCUS SEARCH OPERATION CHECK 1. Press CD open knob. 2. Open the lid for CD. 3. Push on SWITCH (S801) as following figure. 4. Confirm the laser diode emission while observing the objecting lens. When there is no emission, Auto Power Control circuit or Optical Pick-up is broken. Objective lens moves up and down once for the focus search. Insert a precision screw driver and push SWITCH (S801)