Sony d e 451 service manual

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Ð 2 Ð Specifications ............................................................................ 1 1. SERVICING NOTES ................................................... 3 2. GENERAL ...................................................................... 4 3. DISASSEMBLY 3-1. Lid ASSY, Upper ........................................................ 5 3-2. Cabinet (Upper) ASSY, Cabinet (Lower) Sub ASSY, MD Assy ..................................................................... 5 3-3. Main Board, LED Sub Board (E456CK, E459CK) ... 6 3-4. Turn table motor ASSY (Spindle) (M902), Optical pick-up (DAX-11E), Sled motor ASSY (M901) ........................................... 6 4. SERVICE MODE.................................................... 7 5. ADJUSTMENTS .......................................................... 8 6. DIAGRAMS 6-1. Explanation of IC Terminals ...................................... 11 6-2. Block Diagram .......................................................... 13 6-3. Printed Wiring Boards .............................................. 16 6-4. Schematic Diagram ................................................... 19 7. EXPLODED VIEWS 7-1. Cabinet Section ......................................................... 29 7-2. Optical Pick-up Section ............................................ 30 8. ELECTRICAL PARTS LIST ................................... 31 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 damaged by heat. TABLE OF CONTENTS 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 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 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 : IC501 !ª pin When checking FOK, remove the lead wire to disc motor. ¥ S curve P-to-P value : 0.9 Ð 1.5Vp-p IC501 #Á pin. (Connect pin !ª of IC501 (TP880) and 3 of IC501 (GND) with a jumper wire). When checking S curve P-to-P value, remove the lead wire to disc motor. ¥ Adjusted part for focus gain adjustment : RV503 ¥ RF signal P-to-P value : 0.8 Ð 1.2Vp-p ¥ Traverse signal P-to-P value : 1.0 Ð 2.4Vp-p ¥ The repairing grating holder is impossible. ¥ Adjusted part for tracking gain adjustment : RV502 SECTION 1 SERVICING NOTES Fig. 1-2 Digital Voltmeter Connecting Location NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT 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) 3. Connect a level meter as shown in Fig. 1-2 4. Press the ^ key. Fig.1-1 Method to push S801 AC2211397 year version month A : less than 48 mA current value date line No.shift No. 5. Calculate the current value by the reading of the digital voltmeter. Reading of the tester (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(25°C) Variation by temperature : 0.4mA / °C 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. [MAIN BOARD] (Side B) S801 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 S801 (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 S801 as shown in Fig. 1-1 . 3. 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. 1 5 81720 24 25 32 30 TP102 TP202 TP302 TP306 TP540 TP508 IC501 TP503 TP533 (VC) TP523 TP547 TP513 (RFO) TP502 TP504 TP506TP507 TP534TP511 TP512TP509TP514 (TEO)TP515 TP521TP522 C105 C108C205 C208 C501 Q201 Q101 D105 D804 D205 FB201 FB101 FB302 R521 R512 R519 R501 R807 R510 48 R549 R517 R504 R503 R502 C514 C599 C598 C503 C505 C510 C513 C504 C512 C511 C516C520 L502 Q501 C525 C517 R505 C506 L508C571 TP506 digital voltmeter TP547