Sony d v 55 service manual

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Ð 2 Ð Specifications ........................................................................... 1 1. SERVICING NOTE ....................................................... 3 2. GENERAL Location and Function of Controls .................................... 4 3. DISASSEMBLY 3-1. Cabinet (Lower) Sub ASSY ....................................... 6 3-2. Lid Sub ASSY, Switch Unit ........................................ 6 3-3. MPEG Board .............................................................. 7 3-4. MD ASSY, IR Board .................................................. 7 3-5. Main Board ................................................................. 8 3-6. Turn Table Motor ASSY (Spindle) (M902), Optical Pick-up (DAX-01A2), Sled Motor ASSY (M901) .......................................... 8 4. SERVICE MODE (TEST MODE) 4-1. How to Enter the Test Mode ....................................... 9 4-2. How to Release the Test Mode ................................... 9 4-3. Each Key Function in Test Mode ............................... 9 5. ELECTRICAL ADJUSTMENTS 5-1. Precautions for Adjustment ...................................... 10 5-2. Before Beginning Adjustment .................................. 10 5-3. Tracking Balance Check ........................................... 10 5-4. Focus Bias Check ...................................................... 11 6. DIAGRAMS 6-1. Explanation of IC Terminals ..................................... 12 6-2. Block Diagram .......................................................... 19 6-3. Printed Wiring Boards (Main Section) ..................... 23 6-4. Schematic Diagram (Main Section) ......................... 27 6-5. Schematic Diagram (MPEG Section) ....................... 34 6-6. Printed Wiring Boards (MPEG Section) .................. 37 7. EXPLODED VIEWS 7-1. Cabinet (Upper) Section ........................................... 42 7-2. Cabinet (Lower) Section ........................................... 43 7-3. Optical Pick-up Section (CDM-2901ABA) ............. 44 8. ELECTRICAL PARTS LIST................................ 45 SAFETY-RELATED COMPONENT WARNING!! COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE WITH MARK !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. Flexible Circuit Board Repairing ¥ Keep the temperature of the 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. 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. TABLE OF CONTENTS This Compact Disc player is classified as a CLASS 1 LASER product. The CLASS 1 LASER PRODUCT label is located on the bottom exterior. CAUTION Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure. DANGER Invisible laser radiation when open and interlock failed or defeated. Avoid direct exposure to beam.

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Ð 3 Ð SECTION 1 SERVICING NOTE NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT 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 30cm away from the objective lens. Before Replacing the Optical pick-up Block Please be sure to check thoroughly the parameters as per the ÒOptical pick-up Block Checking ProcedureÓ (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 ((£ pin (FOK). When checking FOK, remove the lead wire to disc motor. ¥ S curve P-to-P value : 1.2 Ð 2Vp-p IC501 !¤ pin. When checking S curve P-to-P value, remove the lead wire to disc motor. ¥ RF signal P-to-P value : 0.5 Ð 0.9Vp-p ¥ Traverse signal P-to-P value : 1.2 Ð 2.0Vp-p ¥ The repairing grating holder is impossible. Laser Diode Checking Methods During normal operation of the equipment, emission of the laser diode is prohibited unless the upper panel is closed while turning ON the S804 (push switch type). The following two checking methods for the laser diode are operable. Method-1 (In the service mode or normal operation) : Emission of the laser diode is visually checked. 1. Open the upper lid. 2. Push the S804 as shown in Fig. 1-1. 3. Press the ß key. 4. Check the object lens for confirming normal emission of the laser diode. If not emitting, there is a trouble in the automatic power control circuit or the optical pick-up. During normal operation, the laser diode is turned ON about 2.5 seconds for focus searching. Method-2 (In the service mode or normal operation) : Check the value of current flowing in the laser diode. 1. Remove the upper panel. 2. Read the current printed on the rear side of the optical pick-up. (Print on the rear side of the optical pick-up) Fig.1-1 Method to push S804 AC2211397 year version month A : less than 48 mA current value date line No.shift No. Fig. 1-2 Digital Voltmeter Connecting Location [MAIN BOARD] (SIDE B) 4 321 56 4 321 56 1510 11 20 B C E B C E B C E BCE BCE R532 C525 C526 R751 C518 D501 C516 R544 L506 R518 IC501 R520R531 R522 R542 R514 C530 C507 R515 R513 R525 C522 C529 R512 R516 R543 C502Q504 R510Q506 Q502 R509 C509 R506 R554 R528 R507R511 R521 R519 R517 R526 Q501 C519 R523Q503 Q507 C508R527 TP512 TP520 TP534 TP540 TP537 TP531 TP536 TP524 TP535(RFO) TP522 (FE)TP523 (TE) TP508 (VC) TP521 TP752 TP810TP809 TP530 TP525 15 TP524 digital voltmeter TP520 S804 3. Connect a digital voltmeter as shown in Fig. 1-2 4. Press the ß key. 5. Calculate the current value by the reading of the digital voltmeter. Reading of the digital voltmeter V Ö 4.7 W = current value (A) (Example) Reading of the digital voltmeter of 0.2256 V : 0.2256 V Ö 4.7 W = 0.048 (A) = 48 mA 6. Check that the current value is within the following range. +5 ¥ Current value of the label -11 mA(25ûC) Variation by temperature : 0.4mA / ûC Current increases with temperature increased. Current decreases with temperature decreased. If the current is more than the range above, there is a trouble in the automatic power control circuit or the laser diode is in deterioration. If less than the range, a trouble exists in the automatic power control circuit or the optical pick-up.