Sony-CDPCX270-cdc-tm 维修电路原理图.pdf

STraining ManualCircuit Description and TroubleshootingCourse: A-122CDChangerModels: CDP-CX235CDP-CX270CDP-CX335CDP-CX400CDP-CX450RadioFans.CN 收音机爱 好者资料库Sony Service CompanyA Division of Sony Electronics Inc 2000All Rights ReservedPrinted in U.S.A.S is a trademark of Sony ElectronicsRadioFans.CN 收音机爱 好者资料库Circuit Descriptionand Troubleshooting:Models:CDP-CX235CDP-CX270CDP-CX335CDP-CX400CDP-CX450Prepared by: National Training Department Sony Service Company A Division of Sony Electronics Inc.Course presented by _Date_Student Name _Overall Block Diagram3Information Gathering3CD Playback3Power Supply / Display5Power Supply5Fluorescent Display7Power On11AC Power Only11Power ON11Communications IC501 - IC70111Communications IC501 - IC10113Door Motor Drive15Operation15Drive15Feedback15Tray Table Positioning17Tray Table Slots17Light Sensors17Table Motor Drive19Front Panel Rotary Encoder - Operation19Direction of Rotation19Tray Table Position Sensors19Table of ContentsTray Table Motor Drive21CD Location & Label Storage23Disc Loading Drive27Operation27Motor Stop27Optical Pickup29The Laser and Lens29Focus Coil29Tracking Coil29Detector Outputs29Servo / Audio Processing Block31Servo Block31Sled Motor31Focus Servo31Tracking Servo33Spindle Motor33Audio Block33Servo Processing35Sled Motor Drive35Laser35Focus35Tracking Servo35Spindle Servo37Audio / Display Output39Analog Audio Output39Digital Output39Display39Troubleshooting41Disc Doesnt Spin42Servo Processing Diagram43Focus44Disc Wont Spin Flowchart45Disc Spins, But Doesnt Read the DiscsTable of Contents (TOC)47RF Output47Tracking Servo47Disc Spins, But Does Not Read TOC Flowchart48Spindle Servo49No Audio50Optical Assembly Tests51S Curve Check51E-F Balance Check51RFO Level Check52APPENDIXControl A Communications for Additional FeaturesiDefective DiscsiiiTroubleshooting Using the RFO WaveformvAbbreviations Used in Compact Disc Playervi1ModelDiscListCapacityPriceCd MechBD BoardList PriceOptical Assembly / Part numberList PriceAll of these numbers sub to 8-848-379-312000CDP-CX235200170.00$ CDM-40BA4724029A$76.15KSS-213BNK / 8-848-379-3182.12$ CDP-CX270200$1,000CDM-40BA4699163A$112.01KSS-213B / 8-848-376-0182.12$ CDP-CX335300300.00$ CDM-54-KIBD35EA4724761A$82.12KSS-213BFN / 8-848-379-3182.12$ CDP-CX400400360.00$ CDM-62-K1BD35AA4724761A$82.12KSM-213BFN / 8-820-026-03 *82.12$ CDP-CX450400480.00$ CDM-62-K1BD35AA4724761AKSM-213BFN / 8-820-026-03 *82.12$ *use CX335 manual for part number 1999of spindle or sled motorCDP-CX225200250.00$ CDM-40A4699038A$112.01KSS-213B / 8-848-376-0182.12$ CDP-CX230200300.00$ CDM-40BA4724029A$76.16KSS-213BNK / 8-848-379-3182.12$ CDP-CX270200$1,000CDM-40A4699038A$112.01KSS-213B / 8-848-376-0182.12$ CDP-CX300300360.00$ CDM-54-KIBD35EA4724761A$82.12KSS-213BFN / 8-848-379-3182.12$ CDP-CX350300480.00$ CDM-54-KIBD35EA4724761AKSS-213BFN / 8-848-379-3182.12$ CDP-CX691300CDM-54-KIBD35EA4724761AKSS-213BFN / 8-848-379-3182.12$ 1998CDP-CX210200CDM-40A4699038A$112.01KSS-213B / 8-848-376-0182.12$ CDP-CX220200CDM-40BA4724029A$76.16KSS-213BNK / 8-848-379-3182.12$ CDP-CX240200CDM-40BA4724029AKSS-213BNK / 8-848-379-3182.12$ CDP-CX260200CDM-40BA4724029AKSS-213BNK / 8-848-379-3182.12$ CDP-CX270200CDM-40A4699038A$112.01KSS-213B / 8-848-376-0182.12$ CDP-CX90ES200$1,100CDM-40A4699038AKSS-213B / 8-848-376-0182.12$ CD Mega Changer Product Line (USA)List Prices are as of 7/1/002IntroductionThis training manual is based upon the model CDP-CX235 CD Changer.This model is the entry changer in the “Mega” Changer product line forthe year 2000. The “2” in the model number refers to the 200 disc capac-ity of these Changers. These 200 series models are mechanically com-plex so there are more CD transport and mechanical adjustments to bemade.The concepts and circuitry in this 200 disc model are similar to the 300disc CDP-CX300 series and 400 disc CDP-CX400 series CD Changers.In these larger capacity models, the CD transport and CD mechanismuse fewer parts. As a result, the higher capacity Changers require feweradjustments.Generally, the electrical troubleshooting procedures and test modes out-lined in this training manual can be applied to all of the changer modelslisted for the last three years. This is because for troubleshooting pur-poses, they are electrically similar. Mechanically, the 200 disc Changersuse one basic chassis and the 300 and 400 disc Changers use anotherchassis so the mechanical adjustments differ.Model CDP-CX90ES/CDPCX-270The model CDP-CX90ES/CDPCX-270 was carried over from the 1998year because it was the only chassis that had the following major fea-tures:A video output for an on-screen display using a TV.A front panel jack that permitted a computer keyboard to be pluggedin. This allowed the user to label or re-label each CD slot locationquickly using the keyboard instead of the slower remote control.Model CDP-CX235The board layout of the CDP-CX235 is shown. The bulk of the electronicsare on the rear main board. To its left in the vacant area is the CD mecha-nism housing the optical assembly and servo (BD) board. The small boardsalong the bottom of the chassis hold the tray table and disc sensors. Thetop illumination board houses 3 LEDs to light the disc compartment whenthe CD Changer is powered on.3Overall Block DiagramAt the core of the 200 disc CD Changer is the System Control (Syscon)IC501. IC501 serves as the interface between the user and the mecha-nism. Before IC501 can respond to the users commands for a disc toplay, it must know the following:If the Disc door is closed.If the CD Mechanism is in the chucked position.At which disc slot is the tray table is positioned.Some of this information is stored in an external memory IC; the remain-der IC501 will have to gather at power ON using the sensors and switcheslinked to the Door, Tray Table and Loading Motors.Information GatheringPressing the power ON button causes IC501 to use “IC SW” to switch onregulator IC506. IC506 apples power to the BD board, which houses theoptical assembly. D+5V is also applied to the LED in the door compart-ment to inform the user power is ON.After Syscon IC501 turns on power, IC501 accesses its external memoryIC. Data about the disc last loaded in the CD Mechanism is returned toIC501. The disc label information is output as data to the FL Display ICfor display on the front panel fluorescent tube. If there was no label infor-mation, then just the discs number is displayed.Syscon now takes a series of steps to check the memory information:1. Syscon activates the disc door motor to close the door if its corre-sponding switch indicates the door is open.2. Next, Syscon checks the loading motor switch position to see if theCD Mechanism is in the chucked position (disc loaded).If chucked, IC501 will initiate disc PB to read its TOC.If unchucked, IC501 will drive the tray table motor, rotating its discspast the disc sensors. While the tray is rotating, the tray sensorsinform IC501 of the disc slot location while the disc sensor tellsIC501 if there is a disc present at that slot. The last disc playedaccording to memory will be loaded and its TOC read (if present).Once Syscon IC501 is confident the tray table information is valid, IC501turns the CD Changer control over to the user by accepting pushbuttoncommands.The user can use the front panel controls to select another disc or playthat one. When Syscon knows the loading motor is in the chucked posi-tion (loading motor switch), the CD can be played.CD PlaybackSyscon IC501 initiates CD play by sending data, clock and latch commu-nications to IC101 on the BD board. This causes IC101 to turn on thelaser, focus, tracking and spindle servos that employ the laser diode, alongwith the focus coil, tracking coil, sled motor and spindle motor in the opti-cal assembly.Once these servos are operating, the disc information (RFO) is output.RFO is received by Servo Control IC101 which:Converts the data back to the original modulation scheme (EFM).Error corrects the data (parity error correction).Reconstructs its original pattern (CIRC).Creates additional digital samples (oversampling) to reduce noise inthe final analog audio.Converts the signal from digital to analog form (D/A Converter).Analog audio is output from IC101 to the rear panel jacks.4OVERALL BLOCK DIAGRAM (MODEL CDP-CX235)7/5/00MUTEIC701FL DISPLAYDRIVERMEMORYIC506REG/SWPOWERSUPPLYIC501SYSTEMCONTROLIC503MOTORDRIVERIC401AUDIOAMPOPTICALPICK-UPASSEMBLYKSS213BRF AMPDIGITALOPTICALOUTPUTFRONTPANELBUTTONSFL DISPLAYTUBEA-FRFOERRORSIGNALFL DATA,CLK,LATCHDISC DOORLIGHTAUDIO MUTED+5V+7VRESETICSW+11.5VSOURCE-13.5V SOURCE-28VSOURCELINE OUTDOUTRESETFROMIC506MMMDOORTRAYLOADING+5V SOURCEDISPLAY BD.BD BOARDMAIN BD.JACK BD.TO BD BOARDLR0A122 1251COIL &MOTORDRIVERIC101SERVOCONTROL/DSPSWITCH ORSENSORFILAMENTVOLTAGETO DISPLAY BD.AUDIOOUTPUT(JACKBD.)5Power Supply / DisplayOverviewThe power supply stage produces seven voltages when the CD Changeris plugged into AC. Some of these voltages from the main board powerthe FL Driver microprocessor IC701 and the FL indicator tube on the dis-play board.Power SupplyPower Supply OutputOutput VoltageFromDestination1. +11.5VdcBridge RectifierD501-4Regulator/Sw IC506,+5V Regulator IC504,Motor Driver IC503.2. 13.5VdcBridge RectifierD501-4Audio mute transistors(Q325/e, Q327/e andQ425/e), Motor driverIC503.3. +5Vdc SourceRegulator IC504Syscon IC501 (not shown),FL Driver IC701.4. +5VdcBridge D501-4 &Zener D508Mute transistors Q325/e,Q327/e and Q425/e.5. Reset +5VReset IC505Syscon IC501 (not shown),FL Driver IC701,LED Driver IC702 (notshown).6. 3.7VacPower TransformerT901Fluorescent Display Tubefilament7. -28VQ501/emitterReference voltage for theFluorescent Display+11.5V Source / -13.5V SourceWhen the CD Changer is plugged into AC, this voltage is applied to theprimary winding of T901. The secondary winding that is center tapedapplies 20.6Vac to a four-diode bridge rectifier designated D501 to D504.The positive output of the bridge rectifier is filtered by C501 to become the+11.5V source voltage.The negative output of the bridge rectifier is filtered by C502 to becomethe 13.5V source voltage.+5Volt SourceThe +11.5V source voltage is reduced and regulated by IC504 to producethe +5V source voltage for the CD Changer.+5VdcThe +11.5V source voltage is reduced by R505 and R508 and applied to5.1 volt zener diode D508 for shunt regulation. Shunt regulation is whena device like this variable resistance zener diode is placed in parallel withthe load. The zener diode resistance varies to keep the voltage at theload reasonably stable.This +5 volts that is output is used by the mute transistors Q325, Q327,and Q425 to control the left and right channel audio muting at power ONand OFF and when plugged and unplugged from AC.D509 and C505 are used to insure there is sufficient voltage for the muteoperation when the unit is unplugged. C505 holds the +5V for the mutetransistors and diode D509 blocks this voltage from being used by theloads on the 11.5V line (D509/anode).Reset +5VWhen the +5Volt Source voltage outputs regulator IC504, IC505 createsa reset pulse using R506 and C507. Each one of these three parts has arole in creating the reset pulse. When the source voltage is input IC505,IC505 holds it output LOW for a fixed amount of time dependent uponIC505s design. This LOW grounds out C507 at the output. When theIC505 releases ground, C507 is charged by R506 to +5V.The reset output of IC505 is applied to the IC501 and IC701 microproces-sors in this CD Changer. Generally, reset occurs when the reset input toa device is held LOW while power (Vcc) is applied.6IC702LED DRIVERM66310FPPOWER SUPPLY (CDP-CX235)7/7/00142315 111332R502165IC701FL DRIVERMSM9202-03GS55567IC504REGTA7805IC505PST994D60647991155859WORDSNP3.7VACJOGBD.C503100D50630VT901THERMALFUSEC5021000C5013300Q501D5076.2VR50133kFILAMENTVOLTAGEL901NOISEFILTERCHOKED509R505R508D5085.1VC505+5V TO MUTETRANSISTORSQ325/E,Q327/E,Q425/ER701100k5V p-pSQ. WAVEC7022.5V p-pOSC.2.48MHz+5VQ701P1-36G1-15FL701 FL INDICATOR TUBEG16DISPLAY BD.R706RESET+5V-28V+5V+5VSOURCE(B+)+MAIN BD.P(36)G1-40V-28V-28VD501-D5041A122 1238D50555222+C507R506SYSCONIC501/30+GRIDS 1-15C506DIG 16VFLVCCOSC0OSC1+11.5V41+11.5V SOURCE TO: IC506REGULATOR,IC503 MOTOR DRIVER-13.5V SOURCE TO: MUTETRANSISTORS Q325,Q327,Q425 AND IC503 MOTOR DRIVERJACKBD.DATA,CLK FROMSYSCON IC501FRONTPANELLEDs7PlatesP2P1GridFilamentSimple FLTubeStructureP1P2P3P4P5P6P1P2P3P4P5P6G1G2P3Plate and GridStructuresWhen the output of IC505 is LOW, these microprocessors are held inreset and are inactive (apparently dead).3.7VacA low AC voltage from power transformer T901 is applied to the filamentof the fluorescent indicator tube FL701.-28VThe 41-ohm secondary winding of transformer T901 produces 31.7Vacthat is rectified by D505. The 40Vdc produced is regulated by Q501using zener diode D506 for voltage stabilization.The 28Vdc output from regulator Q501/emitter is applied to the fluores-cent driver stage as the negative supply voltage and to one end of thefilament via D507as the tubes electron source.Fluorescent DisplayThe FL701 Fluorescent Display tube needs the following to light a seg-ment or a word in the tube:Filament voltagePositive voltage simultaneously applied to the grid and plate.Basic OperationThe filament voltage comes from the power transformer T901 and thepositive pulses come from FL Driver IC701.Just like a vacuum tube, the fluorescent display tube needs a source ofelectrons. The electrons come from the filament, which is connected tothe 28V source. A controlling grid in the middle acts as a gate to deter-mine if electrons should pass onto the plate to make it glow. At the gate,a more positive voltage than the filament attracts the electrons and opensthe gate. A grid voltage that is the same as the filament will keep elec-trons from leaving the filament so there is no glow.The plate structures will be phosphorescent when struck by electrons. Toget the electrons to the plate, the plate must have a positive voltage to beattractive.Within the FL tube there are 16 grid structures, each containing 36 plates.Each grid structure produces a character or number by luminating a com-bination of plates.To make a specific plate glow, a grid structure is selected and a positivevoltage is applied to it. At that time, the plate structures that must gloware also brought positive. In the diagram above, when G1 and P3 linesare brought HIGH, the P3 plate in the G1 structure will glow. Even thoughthe P3 structure in the G2 structure is connected in parallel, receiving thesame voltage, it will not glow because the G2 voltage is LOW at this time.The job of FL Driver IC701 is to create and time the grid and plate pulses.Fluorescent Driver IC701When the CD Changer is plugged into AC, Vcc is applied to IC701/pin 64,starting its internal oscillator. The R-C parts that set the frequency of this2.48MHz oscillator (16MHz is on the schematic) are located at IC701/pins 58 and 59.Also at AC plug in, the FL Driver IC701 is momentarily reset. IC505 mo-me