Sony d ej 955 service manual
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2 D-EJ955 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 ˚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. 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. TABLE OF CONTENTS 1. SERVICING NOTES ............................................... 3 2. GENERAL ................................................................... 6 3. DISASSEMBLY 3-1. Disassembly Flow ........................................................... 7 3-2. Upper Lid (A) Sub Assy ................................................. 7 3-3. Cabinet (Upper) Sub Assy .............................................. 8 3-4. Main Board, Optical Pick-up Section (CDM-3325ES) ............................................................... 8 4. ELECTRICAL CHECK .......................................... 9 5. DIAGRAMS 5-1. Block Diagram – MAIN Section (1/2) –....................... 10 5-2. Block Diagram – MAIN Section (2/2) –....................... 11 5-3. Block Diagram – POWER SUPPLY Section –............. 12 5-4. Note for Printed Wiring Boards and Schematic Diagrams ....................................................... 13 5-5. Printed Wiring Board ...................................................... 14 5-6. Schematic Diagram – MAIN Board (1/3) –.................. 15 5-7. Schematic Diagram – MAIN Board (2/3) –.................. 16 5-8. Schematic Diagram – MAIN Board (3/3) –.................. 17 5-9. IC Pin Function Description ........................................... 18 6. EXPLODED VIEWS 6-1. Upper Lid, Cabinet (Upper) Section .............................. 25 6-2. Cabinet (Lower) Section ................................................. 26 6-3. Optical Pick-up Section (CDM-3325ES) ....................... 27 7. ELECTRICAL PARTS LIST ............................... 28 This appliance is classified as a CLASS 1 LASER product. The CLASS 1 LASER PRODUCT MARKING is located on the rear exterior.CAUTION Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous ra- diation exposure. On AC power adaptor -Use only the AC power adaptor supplied or recommended in Accessories (supplied/ optional). Do not use any other AC power adaptor. It may cause a malfunction. Polarity of the plug
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3 D-EJ955 SECTION 1 SERVICING NOTES The laser diode in the optical pick-up block may suffer electro- static 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 emis- sion, observe from more than 30 cm away from the objective lens.BEFORE REPLACING THE OPTICAL PICK-UP BLOCK Please be sure to check thoroughly the parameters as par the Op- tical Pick-Up Block Checking Procedures (Part No.: 9-960-027- 11) issued separately before replacing the optical pick-up block. Note and specifications required to check are given below. - FOK output: IC601 yg pin When checking FOK, remove the lead wire to disc motor. - RF signal P-to-P value: 0.4 to 0.6 Vp-p LASER DIODE AND FOCUS SEARCH OPERATION CHECK During normal operation of the equipment, emission of the laser diode is prohibited unless the upper lid is closed while turning ON the S804. (push switch type) The following checking method for the laser diode is operable. - Method: Emission of the laser diode is visually checked. 1. Open the upper lid. 2. With a disc not set, turn on the S801 with a screwdriver having a thin tip as shown in Fig.1. 3. Press the > N button. 4. Observing the objective lens, check that the laser diode emits light. When the laser diode does not emit light, automatic power control circuit or optical pickup is faulty. In this operation, the objective lens will move up and down 4 times along with inward motion for the focus search. NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT Fig. 1 Method to push the S804 S804detection lever detection lever MAIN board About CD-Rs/CD-RWs This CD player can play CD-Rs/CD-RWs recorded in the CD-DA format*, but playback capability may vary depending on the qual- ity of the disc and the condition of the recording device. * CD-DA is the abbreviation for Compact Disc Digital Audio. It is a recording standard used for the Audio CDs.