Sony-CDPCX250-cd-sm 维修电路原理图.pdf

Model Name Using Similar MechanismNEWCD Mechanism TypeCDM-40Base Unit TypeKSM-213BKN/M-NOptical Pick-up TypeKSS-213B/S-NSPECIFICATIONSMICROFILMCOMPACT DISC PLAYERUS ModelCanadian ModelAEP ModelE ModelAustralian ModelCDP-CX250SERVICE MANUAL,CanadaEurope and Singapore220V-230V AC, 50Hz110V-120V or 230-240V AC,adjustable, 50/60 HzERadioFans.CN 收音机爱 好者资料库 2 MODEL IDENTIFICATION BACK PANEL TABLE OF CONTENTS1. SERVICING NOTE.32. GENERAL .43. DISASSEMBLY3-1.Front Panel Assembly. 123-2.Back Panel Assembly . 123-3.Table Assembly . 133-4.Mechanism Deck Assembly . 133-5.Base Unit Assembly . 144. TEST MODE.155. ADJUSTMENTS5-1.Mechanical Adjsument . 165-2.Electrical Block Checking. 226. DIAGRAMS6-1.Circuit Boards Location . 246-2.IC Pin Function IC101 Digital Servo, Digital Signal Processor (CXD2545Q). 25 IC303 System Control (CXP84332-Q27Q) . 286-3.Block Diagram . 316-4.Printed Wiring Board BD, DISP Section . 356-5.Schematic Diagram BD, DISP Section . 396-6.Printed Wiring Board MAIN Section . 436-7.Schematic Diagram MAIN Section . 476-8.IC Block Diagrams. 517. EXPLODED VIEWS7-1.Case and Back Panel Section . 547-2.Disc table Section . 557-3.Front panel Section. 567-4.Mechanism Section-1 (CDM-40) . 577-5.Mechanism Section-2 (CDM-40) . 587-6.Base Unit Section-1 (KSM-213BKN/M-N). 597-7.Base Unit Section-2 (KSM-213BKN/M-N). 608. ELECTRICAL PARTS LIST. 614-982-813-CAUTIONUse of controls or adjustments or performance of proceduresother than those specified herein may result in hazardous ra-diation exposure.The laser component in this productis capable of emitting radiationexceeding the limit for Class 1.This appliance is classified asa CLASS 1 LASER product.The CLASS 1 LASERPRODUCT MARKING islocated on the rear exterior.This caution labelis located insidethe unit.Notes on chip component replacement Never reuse a disconnected chip component. Notice that the minus side of a tantalum capacitor may bedamaged by heat.Flexible Circuit Board Repairing Keep the temperature of soldering iron around 270Cduring repairing. Do not touch the soldering iron on the same conductor of thecircuit board (within 3 times). Be careful not to apply force on the conductor when solderingor unsoldering.US Model: 0Canadian Model: 1AEP,German Model : 2E Model: 3Singapore Model: 4Austrarian Model: 5RadioFans.CN 收音机爱 好者资料库 3 ATTENTION AU COMPOSANT AYANT RAPPORT LA SCURIT!LES COMPOSANTS IDENTIFIS PAR UNE MARQUE ! SURLES DIAGRAMMES SCHMATIQUES ET LA LISTE DESPICES SONT CRITIQUES POUR LA SCURIT DEFONCTIONNEMENT. NE REMPLACER CES COMPOSANTSQUE PAR DES PICES SONY DONT LES NUMROSSONT DONNS DANS CE MANUEL OU DANS LESSUPPLMENTS PUBLIS PAR SONY.SAFETY-RELATED COMPONENT WARNING !COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINEWITH MARK ! ON THE SCHEMATIC DIAGRAMS AND INTHE PARTS LIST ARE CRITICAL TO SAFE OPERATION.REPLACE THESE COMPONENTS WITH SONY PARTSWHOSE PART NUMBERS APPEAR AS SHOWN IN THISMANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.SAFETY CHECK-OUT(US model only)After correcting the original service problem, perform the follow-ing 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 asdescribed below.LEAKAGEThe AC leakage from any exposed metal part to earth Ground andfrom all exposed metal parts to any exposed metal part having areturn to chassis, must not exceed 0.5 mA (500 microampers). Leak-age current can be measured by any one of three methods.1. A commercial leakage tester, such as the Simpson 229 or RCAWT-540A. Follow the manufacturers instructions to use theseinstruments.2. A battery-operated AC milliammeter. The Data Precision 245digital multimeter is suitable for this job.3. Measuring the voltage drop across a resistor by means of a VOMor battery-operated AC voltmeter. The “limit” indication is 0.75V, so analog meters must have an accurate low-voltage scale.The Simpson 250 and Sanwa SH-63Trd are examples of a pas-sive VOM that is suitable. Nearly all battery operated digitalmultimeters that have a 2V AC range are suitable. (See Fig. A)NOTES ON HANDLING THE OPTICAL PICK-UP BLOCKOR BASE UNITThe laser diode in the optical pick-up block may suffer electrostaticbreakdown because of the potential difference generated by thecharged electrostatic load, etc. on clothing and the human body.During repair, pay attention to electrostatic breakdown and also usethe procedure in the printed matter which is included in the repairparts.The flexible board is easily damaged and should be handled withcare.NOTES ON LASER DIODE EMISSION CHECKThe laser beam on this model is concentrated so as to be focused onthe disc reflective surface by the objective lens in the optical pick-upblock. Therefore, when checking the laser diode emission, observefrom more than 30 cm away from the objective lens.LASER DIODE AND FOCUS SEARCH OPERATION CHECKCarry out the “S curve check” in “CD section adjustment” and checkthat the S curve waveform is output repeatedly.SECTION 1SERVICING NOTEFig. A. Using an AC voltmeter to check AC leakage.To Exposed MetalParts on Set0.15F1.5kACvoltmeter(0.75V)Earth Ground 4 SECTION 2GENERALLOCATION OF PARTS AND CONTROLSFront Panel1 POWER button2 CONTINUE button3 Display window4 SHUFFLE button5 PROGRAM button6 REPEAT button7 TIME/TEXT button8 Front cover9 MEMO SEARCH button! INPUT button! Remote sensor! JOG dial! ENTER button! CHECK button! CLEAR button! p (stop) button! P (pause) button! (play) button! AMS* button OPEN button GROUP buttons 1-8 TIMER switch* AMS is the abbreviation for Automatic Music Sensor.!1 234567809! 5 forThis section is extracted frominstruction manual. 6 7 8 9 10 11 12 SECTION 3DISASSEMBLYNote : Follow the disassembly procedure in the numerical order given.3-1. FRONT PANEL ASSEMBLY3Two screws (BVTT3x6)2Three screws (BVTT3x6)4Flat type wire (CN601)1Connector(CN501)3Five screws(BVTT3x6)4Two screws(BVTP3x10)2Four screws (BVTT3x6)6Back panel5Remove the PC board holder3-2. BACK PANEL ASSEMBLY7Front panel assembly1Two screws(BVTP 3x8)6Removethe claw5Remove the claw 13 3-3. TABLE ASSEMBLY1Stop ring (E type)2Two screws(BVTT3x6)7Washer6Table assembly3Two holder assemblies4Three screws (BVTT3x6)5Three holder assemblies3-4. MECHANISM DECKIlluminationboard3Connector(CN303)2 Screw(BVTT3x6)1Four screws (BVTT3x6)4Connector(CN308)Jackboard5Guideassembly!Mechanism deck6Flat type wire(23core) (CN303)Main board7Connector(CN304)8Connector (CN504)Main boardJack board9Nine screws (BVTT3x8) 14 3-5. BASE UNIT1Screw (BVTT3x6)2Fulcrum plate(BU UPPER) assy3Base unit 15 ButtonCONTINUESHUFFLEPROGRAMGROUP 1 (1)GROUP 2 (2)GROUP 3 (3)GROUP 4 (4)GROUP 5 (5)GROUP 6 (6)GROUP 7 (7)GROUP 8 (8)(9)(10/0)CHECKCLEARSECTION 4TEST MODE4-1. Display Check ModeWith the power turned off (standby state), press the POWER buttonwhile pressing the P (pause) button.All FL segments and grids light up together with the (play),P (pause), and standby LEDs.At the same time, the GROUP LEDs are scanned one by one.Note: To exit this mode, press the POWER button.4-2. ADJ Mode1. Turn ON the power of the unit, set disc to disc table, and performchucking.2. Disconnect the power supply plug from the outlet.3. To set ADJ mode, connect the test point (TP301: ADJ) of the MAINboard to Ground, and connect the power supply plug to the outlet.The power will turn on automatically, and the first track will be played.In this mode, table rotation and loading operations are not performedbecause it is taken that the disc has already been chucked.Note: The same operations are also performed in the following whenthe test point (TP301: ADJ) is connected to Ground after turn-ing on the power. Direct search (movement of sledding motor) is not performed dur-ing accessing Ignored even when GFS becomes L Ignored even when the Q data cannot be read Focus gain does not decrease Spindle gain does not decrease Servo related settings can be set manually and checked (Refer toADJ Mode Special Functions Table)4-3. Key and Display Check ModeTo set this mode, connect the test point (TP302: AFADJ) on the MAINboard to Ground, and connect the power supply plug to the outlet. All FL segments and grids will light up. (All lit check)When a button is pressed, the types of buttons pressed until thenwill be displayed on the left side and the number of the buttons willbe displayed on the right side. However, these will not be displayedfor the following special buttons.p(stop) button:FL segment check(Refer to FL Tube Check Patterns)P(pause) button: FL grid check (Refer to FL Tube Check Patterns)The pause LED also lights up simultaneously.(play) button: All FL segment and grid will light up.The play LED also lights up simultaneously.MagnifiedGrid checkABCDEFL Tube Check PatternsSegment check When the jog dial is rotated to the right, the GROUP LEDs light upin the order of 1n2.8n1. When the jog dial is rotated to the left, the GROUP LEDs light upin the order of 8n7.1n8. The standby LED lights up when the door switch is shut. Abbreviation FL: Fluorescent Indicator TubeIC307IC303R310R337IC301 MAIN BOARD Component Side ADJ Mode Special Functions Table(The buttons shown with ( ) function by using the sup-plied remote commander only)FunctionServo average displayDisplays VC, FE, RF, TE and traverse in hexadecimalnumbersFocus bias displayEach time this is pressed, the focus bias is switchedbetween 1 and 2(1)Bias actually set Optimum bias Minimum jitter(2)U:Upper aliasing bias L:Lower aliasing biasAuto gain displayDisplays focus, tracking, sledding in hexadecimalnumbersIncreases the focus bias in 8 steps.Sets the focus bias in the middle of aliasing.Turns off the tracking and sledding servoReturns the auto gain to the initial value (30)Turns off the focus servoDecreases the focus bias in 8 steps.Re-adjusts the focus biasTurns on the tracking and sledding servoSwitches the focus servo gain between normal and downFG. norm: normal, FG. down: downSets the focus bias to 0 (no bias)Next, displays the jitter measured at the focus bias setS-curve observation modeAutomatic eccentric measurementThe results of measurement is displayed in m directly.TP302AFADJTP301ADJR311 16 SECTION 5ADJUSTMENTS5-1. MECHANICAL ADJUSTMENTPerform the following steps before carrying out adjustments.1. Turn ON the power of the unit, set disc to disc table No. 92, andperform chucking.2. Turn OFF the power.3. Remove the case.4. While pressing the STOP button, turn ON the POWER button.The test mode is set.5. The POWER button LED starts blinking.(Test mode)LEDPOWER buttonSTOP buttonGROUP 1buttonGROUP 5buttonGROUP 1 buttonGROUP 5 buttonCamPulleyPOWERNOTE 1: The cam will start rotating when the GROUP 1 or GROUP5 button is pressed continuously in the test mode.NOTE 2: If the power cannot be supplied, the cam can be rotated byrotating the pulley with your finger. 17 SENSOR ALIGNMENTIf the disc table swings to the left and right just before the disc ischucked, perform the following adjustment.Fixed screwTapering screwdriverLuminus boardBracket (sensor)Lever (stopper) assemblyDisc table(2)Check that the lever (stopper) assem-bly secures the disc table as shown inthe figure.(1)Rotate the cam and adjust to the positionshown in the figure.CamBracket (sensor)Table assemblySwingLEVER (stopper)assemblyCamPAUSE buttonPLAY button(3)Loosen the fixed screw by 60 to 90, and use a tapering screwdriver to adjust the screw as shown in the figure.Move the bracket (sensor) with the tapering screwdriver little by little, and fix the fixed screw at where the play buttons LED (green) isswitched to the pause buttons LED (orange) (or its reverse).(4)Moving the disc table right and left with a hand after the screw isfixed, the table will move by the play of a disc table. If the LEDslight up alternately, the adjustment will be performed correctly. 18 GUIDE (DISC T) ALIGNMENT(2)Check that the state is as shown in thefigure.(4)Move the holder (guide T) with a tapering screwdriver, andset the position of the guide (disc T) to A:B=1:1.(3)Loosen the fixed screw by about 60 .Guide (disc T)CamHolder (guide T)Fixed screwDiscGuide (disc T)ABDiscHolder(guide T)Tapering screwdriverCamGuide (disc T)Holder (guide T)(1)Rotate the cam and adjust to the positionshown in the figure. 19 HOLDER (DISC A) ALIGNMENT(1)Rotate the cam and adjust to the positionshown in the figure.(3)After applying screw-lock to the part, rotate the thrust screw until the holder (Disc A) comes to the center of the disc.CamThrustscrewCamDiscDiscHolder (disc A)Thrust screwHolder (disc A)01 mm(2)Check that the state is as shown in thefigure.Holder (disc A)123123 20 PULLY AND DISC CENTER HOLE ALIGNMENT(1)Rotate the cam and adjust to the positionshown in the figure.(2)Check that the state is as shownin the figure.Note:The disc should not be fixed.Disc0.52mmBase unitDisc pulleyDisc holeHoler (disc A)Fixed screwBracket(BU adjustment)AB(3)Remove the Magnet assembly.CamBase unitBracket(BU adjustment)Magnet assemblyCamMagnet assemblyTapering screwdriverLoosen the fixed screw by 60 to 90, and move and adjust the bracket (BUadjustment) up and down using a tapering screwdriver so that the positions ofthe disc hole and disc pulley become A=B or between A:B=2:1 and 1:2. 21 MAGNET ASSY ALIGNMENTCam(1)Rotate the cam and adjust to the posi-tion shown in the figure.CamAdjustmentscrewMagnet assyBADiscMagnet holderMagnet assyAdjustmentscrew123123Adjustmentscrew(2)Rotate the adjustment screw until A=B or between A:B=2:1and 1:2(3)Apply screw-lock to the part after adjusting. 22 Note:1. CD Block is basically designed to operate without adjustment.Therefore, check each item in order given.2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.3. Use an oscilloscope with more than 10M impedance.4. Clean the object lens by an applicator with neutral detergent whenthe signal level is low than specified value with the followingchecks.S-Curve CheckProcedure :1. Connect oscilloscope to test point TP (FE1) on BD (TEXT) board.2. Connect test point TP301 (ADJ) on MAIN board to ground withlead wire.3. Turn Power switch on to set the ADJ mode.4. Put disc (YEDS-18) in and playback.Press the CHECK button.5. Check the oscilloscope waveform (S-curve) is symmetrical be-tween A and B. And confirm peak to peak level within 31 Vp-p.S-curve waveform6. After check, remove the lead wire connected in step 2.Note : Try to measure several times to make sure than the ratio ofA : B or B : A is more than 10 : 7. Take sweep time as long as possible and light up the bright-ness to obtain best waveform.RF Level CheckProcedure :1. Connect oscilloscope to test point TP (RF) on BD (TEXT) board.2. Turn Power switch on.3. Put disc (YEDS-18) in to play the number five track.4. Confirm that oscilloscope waveform is clear and check RF signallevel is correct or not.Note: A clear RF signal waveform means that the shape “” can beclearly distinguished at the center of the waveform.RF signal waveformoscilloscopeTP (RF)TP (VC)oscilloscopelevel : 1.2 Vp-pVOLT/DIV : 200mVTIME/DIV : 500ns+0.250.20s