Sony CDP-CX450 400-Disc CD Changer - C:\Users\Andrew\Downloads\Sony Service Manuals\CDP CX 450 Cd Player Troubleshooting
Contents
1. ia a Was ald Digital Output Signal Power ON No PB Name Location Frequency Digital Output CN502 pin 10 from 1 4MHz electrical IC101 pin 60 Time base 0 5usec div When a disc is played the base frequency square wave is replaced with data aia M W Ld V I L1 Digital Output Signal Power ON Disc PB Name Location Frequency Digital Output CN502 pin 10 from data electrical IC101 pin 60 Time base 0 5usec div Display SQ data and clock from Servo Control IC101 pins 1 and 2 are applied to Syscon IC501 for processing The results of this data will be the CD time track and name information applied to the FL display driver IC701 The SQ data and clock are only present when a disc is played F chi ch2 F Disc PB track 1 Channel Name Location 1 SQSO Sub Q CN502 pin 12 2 SQCK SQCLK CN502 pin 14 Time Base 10usec div IC401 1 2 BA4558 CN101 502 LINE OUT 1 1 1 72 LINE OUT 2 IC101 72. CH1 1 0 v Location IC103 pin 16 IC103 pin 14 Channel Signal Name 1 RFO test point 2 11 Remove the jumper wire between the ADJ test point and ground Disc Spins But Doesn t Read The Disc s Table Of Contents TOC If the disc spins Servo Control knows the optical assembly is at home position and focus was found so the laser must be good too Now the quality of the RF signal that is output and the tracking and spindle servos are in question Since the optical assembly and the servo circuitry are linked it is difficult to determine if one or the other is bad without replacement The severity of the testing waveform usually distinguishes If the waveform is extremely bad the circuitry is often at fault caused by an abrupt failure A waveform out of spec is often caused by an aging optical assembly The RF and tracking servos can be tested but the spindle motor servo cannot be tested separately RF Output The normal RFO measures about 1 2Vp p As the optical assembly ages it drops until a critical level of about 0 9Vp p causing skipping or to about 0 75p p causing no playback The previous S curve waveform shows that the RF signal appears once focus is achieved When the disc is beginning to play the RFO level should rise quickly and produce a waveform The RF waveform will con tinue if the tracking and spindle motor servos operate Compa
3. S Curve focus Search Changer is in ADJust Test Mode Channel Signal Name Location 1 RFO test point IC103 pin 16 2 FE test point IC103 pin 14 Time base 2msec div Scope ground is taken at Vc IC103 pin 12 Normally as the FE Ch 2 signal would cross through Vc IC101 would start focus servo and the top half of the FE waveform above the Vc base line would never take place PICKUP KSS 213B FOCUS TRACK COIL COIL RIBBON CABLE gt CONNECTOR CN102 VCC IC102 7V 21 E DRIVER 2 wcc BA6382FP SPINDLE SLED FOCUS TRACK SLED DRIVE RF AMP CXA2568M L OUT 1 r2 HS CH L OUT2 E D OUT AUDIO OUT DIG OUT SQS SUBQDATA CLOCK TO SYSCON IC501 XLT CLK C2PO LOCK FOK DATA 9 69 D 5V IC501SYSCON MAIN BD SERVO PROCESSING 10A122 1249 6 28 2000 36 Tracking Servo The tracking servo is turned on after focus is found FOK HIGH This servo results in a periodic track correction signal that looks like about 400mV of noise at the TE test point eh1 pkpk 1 44 chi x L ch2 I 4 nj I mi I i li Normal CD Playback Signal Name Time base 1msec div Scope ground is taken at Vc IC103 pin 12 When the tracking loop is open the laser is no longer following the data trac
4. Button Option Function Continue All Discs Tracks from each changer are alternately plaved starting from the first track in the first disc of the two changers 1 Disc Tracks from each changer are alternately played from a selected disc in each changer Shuffle All Discs Tracks from each changer are alternately played randomly from all discs in each changer 1 Disc Tracks from each changer are alternately played from a selected disc in each changer Next the X Fade button is pressed and finally the Play button is pressed to start the program Display Custom Files from both CD Changers on the TV 1 Changer must be a model CDP CX270 or CDP CX90ES The procedure is simply connect the video output from the CD Changer to the video input of the TV Use the CD s remote commander to navigate Press Player Select to vie the second changer contents on the TV screen Hide the CD Changers from view When the audio devices are con nected by Control A cables any device that contains an IR remote receiver will send the received IR SIRCS signal to all the devices on the Control A bus The SIRCS signal is product specific so only the device the command is designated for will respond even though all devices receive the command e No Delay of Playback between CD Changers The next disc in the programmed or shuffle play order will load and pause 30 seconds prior to the current track ends so there is no delay in
5. Also at AC plug in the FL Driver IC701 is momentarily reset IC505 mo mentarily holds its output LOW when 5V is input This LOW resets FL Driver C701 when Vcc power is present at pin 64 The LOW lasts for 0 2ms 106505 0 8ms C507 10ms i FL701 FL INDICATOR TUBE 28V EA OU oO FILAMENT oOloooggogaod VOLTAGE n p 65 R501 R701 ie D507 100k D505 T D506 30V zb 00 DN D501 THERMAL 2 1 JACK i BD C502 mE K I Q501 ic505 PST994D C507 bi l RESET m pe IC701 R506 FL DRIVER 4 6 2 3 3 mm MSM9202 03GS SYSCON IC501 30 45V L9 64 Osco OSC1 C506 V T OSC 2 48MHz Em R505 46 R706 SV p p D509 p 0505 SQ WAVE 508 45V TO MUTE TRANSISTORS D508 Q325 E Q327 E 5 1 Q425 E i slem 11 5V SOURCE TO IC506 REGULATOR 3300 16508 MOTOR DRIVER 13 5V SOURCE TO MUTE TRANSISTORS Q325 Q327 Q425 AND IC503 MOTOR DRIVER SYSCON C501 11 5V POWER SUPPLY CDP CX235 1A122 1238 7 7 00 Plug into AC 145V KAT pxeq e TP Reset 2 Lent 5 00 v 10msec div After reset IC701 begins normal operation producing sequential grid pulses first When IC701 pin 60 goes HIGH 5V IC701 outputs a posi tive going pulse at each grid pin one after the other Each grid pulse is applied to a gri
6. SERUG OUT COIL MOTOR CONTROL DIGITAL DRIVE DIG SIGNAL OUT PROCESS DSP DISPLAY TUBE PLATE GRIDS LOADING SW S801 DISC CHUCKED 2 FL DISPLAY USER y DRIVER PUSH BUTTONS LIMIT SW S101 OPTICS AT HOME POSITION SERVO AUDIO PROCESS BLOCK 9A1221251 6 29 00 32 search voltage with an amplified FE voltage The FEO output is sent to a current driver IC This IC drives the optical assembly s focus coil to main tain focus on the disc during playback The FE and RFO waveforms can be used in troubleshooting to determine if there is a signal output the optical assembly The FOK test point can be used to determine if the quality of the two signals is sufficient to find focus Tracking Servo Once focus is found FOK goes HIGH the spindle motor starts and the tracking servo loop is closed The tracking servo moves the objective lens so the laser can follow the disc s information track The center of the disc s track is identified using optical assembly detec tors E F The RF Amp converts these two input signals into a track ing error TE correction signal that is sent to Servo Control Servo control amplifies the TE input and closes the servo loop switch output ting the amplified tracking error signal TEO Servo Control ptica Driver RFO O Assembly FE O TE test point E F A TE RF Amp The driver IC t
7. CH3 5 0 CD Playback Starting Channel Signal Name 1 RFO IC103 pin 16 2 FOK test point IC101 pin 24 3 LOCK test point IC101 pin 25 4 C2PO test point IC101 pin 19 Time base 200msec div ground is taken at Vc If all the other servos check OK and the LOCK test point remains LOW spindle servo defective the common cause is the motor itself Audio If the disc is spinning and the LOCK test point is HIGH the servos are working Audio should output Servo Control if the RF data is valid and the IC is OK Servo Control outputs two clues about the audio produced FL display information tracks time elapse L amp R Audio Output FL Servo Display Control Driver Display Mute Buffers C2PO Line Out The SQ information updates the display with running time information The analog audio output goes to buffers and a mute stage before arriving at the rear panel output jacks There is also a line output mute inside Servo Control If the degree of errors in recovering the audio data is high there is no SQ or line output Audio recovery can be monitored at the C2PO test point This point is LOW when digital to audio processing is correct If the servos are work ing LOCK HIGH there is no reason C2PO will be HIGH defective unless the disc is scratched or the Servo IC is defective In the CD Starting Waveform the pu
8. disc tray table The sliding door mechanism consists of a motor that drives a series of gears to slide the door on plastic tracks The door motor stops turning when the limit switch is toggled in the closed or open posi tion Operation Syscon IC501 controls the door movement Only after the CD Changer is powered ON will IC501 respond to the OPEN CLOSE Door button at the Key 2 input IC501 pin 43 Pressing the door button causes IC501 to check the position of the door S810 a 3 position switch places one of three voltages at Syscon IC501 pin 39 to indicate the door position Door Position Feedback Door Position Location Voltage Closed CN504 pin 1 2 5V Neutral in between CN504 pin 1 5V Open CN504 pin 1 OV A closed door will be driven open and vice versa 15 Drive Syscon IC501 applies an output voltage to pin 23 or pin 24 to drive the motor The resultant positive or negative voltage is applied to the door motor Door Motor Drive Movement IC501 pin 24 IC501 pin 23 IC503 pin 9 Door Opening 4 7V OV 3 6V Door Closing 4 8V 3 7V Feedback As the door moves S810 enters the neutral position and 5V is applied to IC501 pin 39 When the door reaches the end of travel the door toggles the S810 limit switch to the other end 1C501 pin 39 is lowered to either 2 5 or OV IC501 responds by stopping the motor voltage at pin 23 or 24 R620 5V gt l2 6110 S621 O DR S
9. optical pick up ribbon cable connector The laser diode will turn on when there is sufficient current to drop about 1 8 to 2 2V at the diode Precautions Although not recommended if you must apply an external voltage to check the diode you must current limit this with a 1k ohm resistor to prevent laser diode damage NEVER LOOK AT THE LASER DIODE LIGHT Use a laser power meter to measure the intensity of this class 1 laser Also if your ohmmeter outputs more than 2V do not check the laser diode for diode continuity The laser intensity is monitored by a photo diode in the optical assembly The PD output into IC103 pin 4 is used to regulate the LD output from pin 3 Laser Diode Control Voltages Laser IC103 pin 3 OFF ON 4 76V 35 Focus The focus search operation is also initiated when the disc is chucked in the CD Mechanism S801 not shown and the limit switch S101 is closed Servo Control IC101 generates the electrical signal that results in the visible lens movement in the optical assembly The changeover from search to servo lock occurs when RFO signal is present and the FE S curve shaped signal voltage crosses to through Vc voltage half of Vcc Vc 2 5V At this recognition time at IC101 pin 24 goes HIGH to mark the transition to servo operation If this transition were inhibited so only the search operation took place the RFO and FE waveforms would look like this
10. or Tape input Both audio devices must already be powered ON Synchronized Recording The selected CD song track will begin play ing just after recording This is achieved by presetting the recorder and CD Changer to the Record Pause and Play Pause mode respec tively When the Recorders Pause is released press pause button the CD player will release pause shortly afterwards Another CD Changer CD Changer Program Play from both CD Changers Play one song or disc after another from either CD Changer 3 Changers is the maximum at this time The procedure is On one changer press the Program button until the program appears program 1 2 3 etc on the display If the first track you want to program is on the first CD Changer skip this next step If the first track is on the second CD Changer press the Player Select button until Second Player appears Turn the Jog dial until the disc you want appears on the display Press Enter to Program the whole disc or select a track using the gt gt fwd button and then press Enter Cross X Fade Playback some CD Changer models This feature enables you to fade in start the next song on the second changer while the current song is fading out to an end thereby mixing the two songs at this time This feature is activated by first pressing the Con tinue or Shuffle Play button to select the songs or discs desired Continue and Shuffle Play X Fade Options
11. 1 2Vp p Time base 0 5usec div RFO when the tracking servo is open defective 1 3Vp p 1msec div Normal RFO in between songs RFO when the spindle motor is bad The 1 2Vp p motors worn bushing causes vibration Time base 0 5usec div that upsets the tracking servo This causes the scalloping along the bottom of the waveform Jo P d 511 joeduro ul 95 SUODEIA2QqQq V vi JBUUBYS ypu JO erep Seymnuep 1 40 497 9274 Di Sn90J JO esuodseJ MO 195 8 Uuipiwpueg AO snood 8H ssed e JO 1nd3nojindu INO JO ul rl BUIYOYMS euJejr ui ureb snooj eonpei 16 Weoque9 nod 5 NO 95 snooJj esJe eH snoo4 NO pemo snoo4 4048 109 snooj pJewo4J snoo4 indui 9 9 jeuJejxe SIU O SpJOM Eep M MY d y JO euo surejuo OSS eur 39019 3 seoueginisip Louey Buunp eyep xoeg Ae d snonunuoo ol NYY 1 e pue esned Buisn peeds ajqnop ye oeg e g YOOUS 3 dsg peziseuduJe aJd Sem opne y Oulyeoipul EUDIS y SSeHdW3 HIS pegenbs ueeq seu 1 Joye jeuDis eyep JH eui I os v jsuep ejep eseaJoul pesn eujeuos eyep 9u ueeunoJ 615 N43 JeAe d WO Indino euDip jTeujejxe JOS
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13. 13 5V SOURCE TO MUTE TRANSISTORS Q325 Q327 Q425 AND IC503 MOTOR DRIVER SYSCON C501 11 5V POWER SUPPLY CDP CX235 1A122 1238 7 7 00 When the output of IC505 is LOW these microprocessors are held in reset and are inactive apparently dead 3 7Vac A low AC voltage from power transformer T901 is applied to the filament of the fluorescent indicator tube FL701 28V The 41 ohm secondary winding of transformer T901 produces 31 7Vac that is rectified by D505 The 40Vdc produced is regulated by Q501 using 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 the filament via D507as the tube s electron source Fluorescent Display The FL701 Fluorescent Display tube needs the following to light a seg ment or a word in the tube e Filament voltage e Positive voltage simultaneously applied to the grid and plate Basic Operation The filament voltage comes from the power transformer T901 and the positive pulses come from FL Driver IC701 Just like a vacuum tube the fluorescent display tube needs a source of electrons The electrons come from the filament which is connected to the 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 a
14. CLOSE DOOR button again to chuck the disc The door will close and the disc will be loaded into the CD mechanism chucked Reenter the adjustment test mode by unplugging AC and reconnect ing the ADJ test point to ground 45 WON T SPIN REPAIR OR REPLACE CHECK CHECK CHECK DEFECTIVE DISPLAY POWER SYSCON FL COMPONENT SUPPLY DRIVER H NG CHECK SLED NG REPAIR LIMIT SWITCH REPAIR CHECK SENSORS SPINDLE FOCUS FOK SWITCHES CLV MOTOR FOCUS LENS MOVEMENT OK CHECK FOR CHECK SLED NG se LASER LIGHT SWITCH ints NG OK REPLACE REPAIR HIGH PICK UP APC CIRCUIT PROBABILITY OF BAD PICK UP DISC WON T SPIN FLOW CHART 124122 6 13 00 10 Watch your scope as you apply AC power If the line goes HIGH focus has been found The transition from search to servo is then performed within Servo Control At this point you know the laser is working and the focus driver part of the IC is good enough to achieve FOK The following waveform compares the RF output to the FOK signal This waveform shows RF signal goes HIGH as soon as focus is found The spindle motor also starts when FOK goes HIGH producing the RF waveform that follows chi ch2 ch4 L NNI s E Loki aoaaa s a punaman CH3 5 00 V CD Playback Starting Channel Signal Name TOT 1 2 FOK test point 3 LOCK test point IC101 pin
15. signal shows losses of RF where the laser is crossing tracks FE start chi pkpk 1 28 chi NI MIRA oni il H jT II II NAA j H MUNI i 1 d i E MNA AN ANAN ATA VANNY Defective Tracking Servo Wavetonns Signal Name Location CH1 ij V STOP Time base 100msec div ground is taken at Vc IC103 pin 12 An open tracking loop is not common and is usually caused by foreign objects in the optical assembly its ribbon cable or a bad driver IC Spindle Servo Even though the spindle motor turns the disc its servo loop may not be closed A defective spindle motor servo produces RFO data that alter nates between good and bad even tough they both look the same on the scope Looking at the LOCK test point at the Servo Control tells you if the spindle motor loop is closed since the focus and tracking servos must 49 work before the spindle servo can close For example if the tracking servo were defective the spindle servo loop cannot close because the RFO data is unreliable Therefore the other servos must be checked prior to this check It also takes a while to process the RFO data to establish a spindle motor lock so the spindle servo is the last servo to engage This is shown when comparing RFO Ch 1 to the LOCK test point Ch 3 m chi b
16. t spin Disc spins but doesn t read the disc s table of contents TOC No Audio Disc Doesn t Spin Before the disc spins the sled must be at home position the laser must be turned on and focus must be found All of these things can be checked easily Sled In the CD Mechanism you will manually move the optical assembly away from home position When you power up the CD changer the sled motor will turn moving the optical assembly to the limit switch This proves the sled assembly is basically OK As you move the gears make sure they move without binding The limit switch must be tested with an ohmmeter The sled check procedure is as follows 1 Shut off power by pressing the POWER button if necessary 2 Locate the large white gear in the CD Mechanism and rotate it so the optical assembly moves away from the spindle motor shaft which is the home position 42 3 Pressthe POWER button and the optical assembly should return home The tray table should also rotate at this time When the optical assembly reaches home it should close the limit switch and power to the sled motor will stop The white gear should be free unpowered proving the limit switch is OK You can also test the limit switch with an ohmmeter Laser It is best to measure the laser brightness with the Leader model 8001 laser power meter During focus search the laser power is 0 03mW in this model CDP CX235 200 disc CD changer The procedure is
17. the tray position as the tray rotates Sensor IC801 monitors the gaps in ring 1 Sensors IC802 and IC803 are both used to monitor the gaps in ring 2 IC802 and IC803 sensors are positioned off center to determine the center of the slot This off center information is necessary so the tray can stop the CD exactly in front of the CD Mechanism each time IC801 s sensor records Ring 1 s gap width These gaps increase as the number of disc slots increase Therefore with a minimum rotation of the tray table the home position can be calculated using the data from IC801 and one of the slot sensors like IC802 TRANSISTOR LIGHT INTERRUPT OUTPUT IS SENSOR HIGH WHEN LIGHT IS RECEIVED SENSORS ON T SEN BD TOP VIEW TABLE BOTTOM VIEW TRAY TOP 777 A 7 Yj Z Z m LULL Z Z Z LLY MU MMF Z 7 LL JPY MAMMA le er RING 1 7 7 Z l SLOT SLOTS amp lt MAXIMUM TRAY TOP 7 777 TRAY TABLE POSITIONING 5A122 1246 6 29 00 18 Table Motor Drive Syscon IC501 drives the Disc s Tray Table 1C501 receives information from three tray table position sensors and the front panel rotary encoder knob to determine where the tray is and where to stop Front Panel Rotary Encoder Operation At the front panel there is a large knob that is used to select discs The knob is connected to a rotary encoder switch on the jog board behind the knob When the
18. 1 Remove the magnet assembly by pulling it outward at a 2 o clock direction 43 WON T SPIN REPAIR OR REPLACE CHECK CHECK CHECK DEFECTIVE DISPLAY POWER SYSCON FL COMPONENT SUPPLY DRIVER H NG CHECK SLED NG REPAIR LIMIT SWITCH REPAIR CHECK SENSORS SPINDLE FOCUS FOK SWITCHES CLV MOTOR HIGH PROBABILITY OF BAD PICK UP FOCUS LENS MOVEMENT OK CHECK CHECK FOR CHECK SLED Na PFFAIR OF REPLACE CIRCUIT LASER LIGHT SWITCH COMPONENT NG OK REPLACE REPAIR HIGH PICK UP APC CIRCUIT PROBABILITY OF BAD PICK UP DISC WON T SPIN FLOW CHART 12A122 7 5 00 2 Without CDs in the tray table momentarily place your fingers between the disc tray and the luminous sensor as you turn the power on The changer will mistakenly sense many discs attempt to load them and turn on the laser 3 Through the opening in the black magnet holder you can measure the laser light with the laser meter probe See the picture in step 1 DO NOT LOOK AT THE LASER LIGHT You may see the laser reflec tion by placing a piece of white paper in the laser path 4 Reinstall the magnet assembly Focus Electronic Focus is a two part operation The first part is when Servo Control uses the driver to move the lens away from the disc and then slowly back toward the disc looking for the focus point on the disc s infor mation layer This first part is called focus search The second focus operation occurs when fo
19. 25 4 C2PO test point IC101 pin 19 Time base 200msec div Scope ground is taken at Vc IC103 pin 12 If FOK does not go HIGH increase the scope s time base and look at the RFO signal for a rise in voltage as the lens repeats the focus search operation in this test mode NO RFO means there is no signal from the optical assembly This could be because there is no laser light or no power ribbon cable If there is an RF output during focus search yet there is no FOK signal the source of the FOK signal can be checked 46 FOK comes from the RFO signal that is derived from the optical detec tors A D When the RFO reaches a set threshold FOK goes HIGH proving that there is light returned from the information of the disc laser and focus OK Optical Assembly Servo Control A B C D Outputs FE FOK RFO can be compared to FE to see if there is an output before condemn ing the optical assembly If there is an output from both the optical assembly and RF amp IC are OK and the likely suspect is a defective Servo Control IC that makes the FOK signal An easy way to see if there is RF under this defective condition is to repeat the Search operation In the ADJ Test Mode press the front panel CHECK button This CHECK button just repeats the search operation but the servo operation that normally follows will be inhibited so the disc will not Pa Place a scope probe at the RFO and FE test points
20. 35 35 35 35 35 Spindle Servo Audio Display Output Analog Audio Output Digital Output Display Troubleshooting Disc Doesn t Spin Servo Processing Diagram Focus Disc Won t Spin Flowchart Disc Spins But Doesn t Read the Disc s Table of Contents TOC RF Output Tracking Servo Disc Spins But Does Not Read TOC Flowchart Spindle Servo No Audio Optical Assembly Tests S Curve Check E F Balance Check RFO Level Check 37 39 39 39 39 41 42 43 44 45 47 47 47 48 49 50 51 51 51 52 APPENDIX Control ACommunications for Additional Features Defective Discs Troubleshooting Using the RFO Waveform Abbreviations Used in Compact Disc Player vi CD Mega Changer Product Line USA Disc Capacity Cd Mech BD Board List Price Optical Assembly Part number List Price All of these numbers sub to 8 848 379 31 2000 CDP CX235 170 00 CDM 40B A4724029A 76 15 KSS 213BNK 8 848 379 31 82 12 CDP CX270 1 000 CDM 40B A4699163A 112 01 KSS 213B 8 848 376 01 82 12 CDP CX335 300 00 CDM 54 KIBD35E A4724761A 82 12 KSS 213BEN 8 848 379 31 82 12 CDP CX400 360 00 CDM 62 K1BD35A A4724761A 82 12 KSM 213BEN 8 820 026 03 82 12 CDP CX450 480 00 CDM 62 K1BD35A A4724761A KSM 213BFN 8 820 026 03 82 12 use CX335 manual for part number 1999 of spin
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22. 5 DIGITAL OUT IC101 60 SQ SQ IC101 1 SQ CK IC101 2 5 AUDIO DISPLAY OUTPUT 40 TO AUDIO OUTPUT JACK J904 JACK BD MUTE TRANSISTORS RST FROM Q325 POWER ON Q327 IC506 6 Q425 DIG OUT TO IC901 JACK BD MAIN BD ae FL DISPLAY DRIVER 11A122 1250 7 5 00 OPTICAL PICKUP ASSEMBLY COIL MOTOR DRIVE USER PUSH BUTTONS A F gt RF AMP TEF RF 0 EYE PATTERN SERVO CONTROL DIG SOUND PROCESS DSP O FOK O LOCK O C2PO DATA CLK CD DATA SUB Q SYSCON ANALOG AUDIO DIGITAL OUT DISPLAY TUBE li PLATE GRIDS FL DISPLAY DRIVER SERVO AUDIO PROCESS BLOCK BD board Old 9A1221251 6 14 00 BD board New Troubleshooting The CD Changer can be divided into two main areas The Changer mecha nism that selects the disc from the tray table and the CD disc Playback mechanism that reads the track of information from the disc and pro duces audio The Changer mechanism periodically requires mechanical adjustment to compensate for wear of parts over a time This will make sure the correct disc is identified and selected The Playback mechanism is more involved requiring an understanding of the playback details for efficient repair Failures in the playback mechanism can be classified into these symp toms Disc doesn
23. As current flows through the focus coil the lens is moved either toward or away from the disc depending upon the direction of the current Therefore applying sufficient current to this coil will move the lens and its focus point to the disc s information layer Tracking Coil The tracking coil on the objective lens is perpendicular to the focus coil Current through this coil moves the lens and the laser beam to one side or another This movement keeps the laser beam on the spiral track as the disc rotates When the tracking coil has moved the lens to the limit the sled moves the optical assembly to follow the spiral track This re centers the lens within limits and the tracking coil can continue to follow the track once again 29 Detector Outputs Laser light striking the information layer of the disc is modulated by the data and returned to the detector area next to the laser diode Detectors A F receive the light amplify and output this signal to the external RF amplifier to produce derived signals Optical Assembly Output Applications Output Derived signal Purpose Detectors A D RFO RF Output Audio Spindle motor lock Detectors A D FE focus error Focus coil correction signal Detector E amp F TE tracking error Tacking and sled motor correction signal A D E F DETECTOR OUTPUT OPTICAL PICKUP 30 TRACKING COIL TRACKING ERROR SIGNAL 7A122 1245 7 7 00 Servo Au
24. IC803 TABLE BOTTOM 4A122 1244 7 5 00 21 Tray Table Motor Drive Syscon IC501 drives the motor that rotates the tray table The following voltages output IC501 and IC503 to move the table in the direction viewed from the top Tray Table Drive Voltages Table m Movement Cw 2 27 d 44 re 3 37 CCW 0 044 0 042 5 22 MEMO SEARCH INPUT DOOR S623 5622 S621 N NEUTRAL POSITION D DETENT POSITION FRONT PANEL JOG BD DISC PB BUTTONS 6611 6617 R612 R618 vorTAGE RE601 KEY 3 3 KEY 2 2 ale SYSCON CXP84340 802 IC803 HOME FLAG TABLE MOTOR DRIVE 22 R565 IC802 FLAG RING TABLE TRAY MOTOR M801 R566 INTERRUPT SENSOR IC503 LOCATIONS CXA1291P 2 3 i IC802 IC803 TABLE BOTTOM 4A122 1244 7 5 00 CD Allocation amp Label Storage Syscon IC501 has its built in memory to remember if the door was open or closed whether the disc was chucked or unchucked and what order of songs to play program play This information is lost when the CD Changer is turned OFF For other items that have to be remembered IC501 uses an external static S RAM memory IC502 powered by C522 when the changer is OFF IC502 stores the following information Keeps track of what tray table slots have discs Stores disc slot number currently in use Groups discs maximum of eight discs per group Stores a name for each disc Label Logs tracks o
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26. SON Y Training Manual CD Changer Models CDP CX235 CDP CX270 CDP CX335 CDP CX400 CDP CX450 Circuit Description and Troubleshooting Course A 122 Sony Service Company A Division of Sony Electronics Inc 2000 All Rights Reserved Printed in U S A SONY isatrademarkof Sony Electronics Circuit Description and Troubleshooting Models cppP cx235 CDP CX270 CDP CX335 CDP CX400 CDP CX450 Prepared by National Training Department Sony Service Company A Division of Sony Electronics Inc Course presented by Date Student Name Overall Block Diagram Information Gathering CD Playback Power Supply Display Power Supply Fluorescent Display Power On AC Power Only Power ON Communications IC501 1C701 Communications IC501 C101 Door Motor Drive Operation Drive Feedback Tray Table Positioning Tray Table Slots Light Sensors Table Motor Drive Front Panel Rotary Encoder Operation Direction of Rotation Tray Table Position Sensors Table of Contents Tray Table Motor Drive CD Location amp Label Storage Disc Loading Drive Operation Motor Stop Optical Pickup The Laser and Lens Focus Coil Tracking Coil Detector Outputs Servo Audio Processing Block Servo Block Sled Motor Focus Servo Tracking Servo Spindle Motor Audio Block Servo Processing Sled Motor Drive Laser Focus Tracking Servo 21 23 27 27 27 29 29 29 29 29 31 31 31 31 33 33 33
27. W cN504 811 i CN812 810 i i i oi NEUTRAL DOOR MOTOR DRIVE 3A122 1243 6 28 2000 16 Tray Table Positioning In order for the tray table to be positioned two rows of slots are molded into the bottom of the rotating tray table forming rings These slots mate with light sensors stationed on the bottom of the CD Changer The sen sors feed back information to Syscon so it can determine the exact tray table position Tray Table Slots At the bottom of the tray table outer ring 2 contains 200 equally spaced slots that look like teeth Each slot consists of an empty area gap in the plastic ring that passes light and an equal width tooth that blocks the light One ring 2 slot corresponds to one disc slot Inner ring 1 contains different spaced gaps Ring 1 s smallest gap is equal in width to one slot and one tooth pair in ring 2 Ring 1 s largest gap is the width of ten of ring 2 s slots and teeth 10 disc slots Generally the width of a gap is one for each group of 10 disc slots 17 Light Sensors Each light interrupt sensor forms a U channel At one side of the sensor there is an infrared LED that shines light through the channel At the other end is a phototransistor that monitors this light When light passes through the channel light is received by the phototransistor the electri cal output is HIGH When the channel is blocked there is no electrical output All three sensors are used to locate
28. clock signals leaving IC501 pins 18 19 and 58 These signals go to FL Display Driver IC701 but there is no instruction to turn on the front panel display while the unit is still OFF i ch3 cH1 5 do v Channel Name 1 FL Data 2 FL CLK Clock 3 FL LT Latch Time base 50usec div Power ON Syscon IC501 receives the power ON command from the front panel push button at pin 44 LOW 1C501 responds by outputting a HIGH at IC SW 11 pin 65 to enable regulator IC506 IC506 has three outputs 1 D 5V from pin 2 is used to Power the digital ICs on the DB board and Turn onthe LED at the disc door compartment This also lets the user know the unit is ON 7V from pin 9 is used to Power the focus sled tracking driver IC102 and Power the coils and motors on the BD board XRST from pin 6 goes HIGH to Unmute the analog audio output lines and Enable Servo Control IC101 and the focus sled tracking driver IC102 on the BD board e nn Communications IC501 IC701 At power On the communications activity increases between IC501 and IC701 This is to provide constant update information to the display IC701 chi L ch2 M Fc uos da v IC501 Activity at Power ON Cha
29. cus has been identified by servo control This is called focus servo The transition from search to servo is marked by a HIGH at the FOK test point when focus is found The search operation can be observed The servo operation can be checked at the FOK test point on the BD board with a scope can check the servo operation The procedure is as follows Focus Search Mode 1 Enter the Adjustment Test Mode by unplugging the AC power from the changer 44 2 On the main board connect the ADJ test point to ground In the CDP CX235 ADJ is under the large 1 farad capacitor Ground is the negative lead of the large 1 farad capacitor n T 9 ADJ 3 Plug the CD changer into AC The unit is in the ADJustment test mode This mode can be used to manually alter some servo param eters 4 Press the front panel CHECK button while in this test mode The laser will come ON the spindle motor will turn and the optical lens will move in the focus search operation Focus Servo Mode 5 To make the transition to focus servo a disc must be inserted so the laser can focus on its information layer You must exit the test mode to install a disc Temporarily remove the jumper wire s ground end and unplug power On the BD board locate the RFO and FOK test points and attach your scope probes to them Plug the changer into AC press the POWER button and then the OPEN CLOSE DOOR button Insert a disc label to the right Press the OPEN
30. d cluster consisting of 36 individual plate structures After all 16 grids are pulsed G1 G16 the sequence repeats Nothing ap pears in the display at plug in because the fluorescent tube has not re ceived plate voltage The waveform below shows grid pulses applied to G14 G15 and G16 of the fluorescent tube ch2 dc 2 V rms 28 3 V 7 cht H _pkpkd ch2 L lt i Fw Fluorescent tube Grid pulses at Power OFF Location Voltage IC701 pin 53 30Vp p IC701 pin 54 30Vp p IC701 pin 55 30Vp p Time base 500usec Plate voltage pulses appear only when the CD Changer is powered ON At power ON Syscon IC501 is not shown sends data to IC701 so it can output these pulses Positive pulses are output the appropriate plate pins P1 36 to form a number letter or word when a grid pulse is simultaneously present The following waveforms show a plate signal Ch 1 compared to the grid 16 signal Ch 3 This plate segment is lit at the grid assembly 16 location when both the plate and the grid outputs are HIGH chi E EN T RE C CH1 20 p v Chan Name Location Voltage IC701 pin 18 30Vp p IC701 pin 55 30Vp p 1 P14 3 G16 Time base 500usec By looking at Channel 1 we see that the plate s
31. dio Processing Block In order for the CD player to produce audio the servo section must con trol the laser beam so it can recover the digital data from the disc Once the data is stable and output at a constant rate it can be processed and returned to analog audio Servo Block A chain of events must occur for the laser to read the disc s data The sequence is as follows CD Play Sequence Operation Purpose Check 1 Optical block Begins reading the Sled moves the returns to home CD atthe TOC area block toward spindle position motor at Power ON 2 Laserturns ON To read the disc Laser power meter data 3 Focus search Find and maintain Scope at the FOK servo ON focus on the disc test point Disc spins after focus is found 4 Tracking servo Follow the disc 5 Scope at the TE test ON spiral information point track 5 Spindle servo Spin the disc so the Disc spins Lock ON data is output at a test point HIGH constant rate when data rate controls the speed 6 CD Data to Music recovery C2PO test point analog processing LOW when no conversion recovery errors Audio output When there is a break in the sequence music cannot be recovered Ex amining the waveform at test points can test each servo 31 Sled Motor When the CD Changer is turned ON no disc chucked the tray table rotates to determine its position Within the CD mechanism the sled motor drives the optical assembly t
32. dio should output if that processing within IC101 is OK PICKUP KSS 213B FOCUS TRACK COIL COIL RIBBON CABLE gt CONNECTOR CN102 VCC IC102 7V 21 E DRIVER 2 wcc BA6382FP SPINDLE SLED FOCUS TRACK SLED DRIVE RF AMP CXA2568M L OUT 1 r2 HS CH L OUT2 E D OUT AUDIO OUT DIG OUT SQS SUBQDATA CLOCK TO SYSCON IC501 XLT CLK C2PO LOCK FOK DATA 9 69 D 5V IC501SYSCON MAIN BD SERVO PROCESSING 10A122 1249 6 28 2000 38 Audio Display Output Analog Audio Output The left and right channels of Servo Control IC101 are applied to amplifier IC401 Their outputs are AC coupled to the rear panel phono jacks The following signal levels were measured using the Sony YEDS 18 test disc track 5 10kHz mono Odb IC401 voltages Measurement Pin 2 Pin 3 Pin 1 DC OV OV OV AC 3Vp p 3Vp p 5Vp p Muting transistors Q325 Q327 and Q425 mute the output audio at power ON and OFF Digital Output The digital output signal from Servo Control IC101 pin 60 is applied to IC901 at the rear panel of the changer Inside IC901 is a visible LED in a plastic package that can connect to the consumer standard optical cable There is always a base waveform at the Digital Output pin 60 of IC101 producing an average DC voltage of 2 47Vdc This waveform keeps the optical output LED lit red when the changer is powered ON
33. dle or sled motor CDP CX225 250 00 CDM 40 A4699038A 112 01 KSS 213B 8 848 376 01 CDP CX230 300 00 CDM 40B A4724029A 76 16 KSS 213BNK 8 848 379 31 CDP CX270 1 000 CDM 40 A4699038A 112 01 KSS 213B 8 848 376 01 CDP CX300 360 00 CDM 54 KIBD35E A4724761A 82 12 KSS 213BEN 8 848 379 31 CDP CX350 480 00 CDM 54 KIBD35E A4724761A KSS 213BEN 8 848 379 31 CDP CX691 CDM 54 KIBD35E A4724761A KSS 213BEN 8 848 379 31 1998 CDP CX210 CDM 40 A4699038A 112 01 KSS 213B 8 848 376 01 CDP CX220 CDM 40B A4724029A 76 16 KSS 213BNK 8 848 379 31 CDP CX240 CDM 40B A4724029A KSS 213BNK 8 848 379 31 CDP CX260 CDM 40B A4724029A KSS 213BNK 8 848 379 31 CDP CX270 CDM 40 A4699038A 112 01 KSS 213B 8 848 376 01 CDP CX90ES CDM 40 A4699038A KSS 213B 8 848 376 01 List Prices are as of 7 1 00 Introduction This training manual is based upon the model CDP CX235 CD Changer This model is the entry changer in the Mega Changer product line for the 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 be made The concepts and circuitry in th
34. e loading motor switch position to see if the CD Mechanism is in the chucked position disc loaded 9 f chucked IC501 will initiate disc PB to read its TOC jfunchucked IC501 will drive the tray table motor rotating its discs past the disc sensors While the tray is rotating the tray sensors inform IC501 of the disc slot location while the disc sensor tells IC501 if there is a disc present at that slot The last disc played according to memory will be loaded and its TOC read if present Once Syscon IC501 is confident the tray table information is valid IC501 turns the CD Changer control over to the user by accepting pushbutton commands The user can use the front panel controls to select another disc or play that one When Syscon knows the loading motor is in the chucked posi tion loading motor switch the CD can be played CD Playback Syscon IC501 initiates CD play by sending data clock and latch commu nications to IC101 on the BD board This causes IC101 to turn on the laser focus tracking and spindle servos that employ the laser diode along with 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 C
35. ecise width and depth so light cancel lation can occur As the disc begins to spin the laser falls on a data pit and its light is reduced canceled so less light is returned to the detec tors How long the light reduction takes place is dependent upon how long the pit is Light reduction yields a LOW RFO voltage In summary it is the transitions from the mirror area to the pit area that create the HIGH to LOW transitions of the RFO voltage Therefore the Vp p transitions of the RFO are dependent upon the reflection quality of the mirror area and the depth of light cancellation in the pit area Disc Defects Disc defects affect the RF signal in several different ways Center Hole Misalignment This causes a wobble in the disc and a corresponding bounce in the RF waveform If the off center hole is real bad the disc will not play CD hole off center exaggerated Bubble in the Plastic CD The bubble diffracts the laser light so less light is returned This causes a LOW in the RFO waveform Information layer is Peeling off or too Thin This causes a reduction of RFO level similar to a low output laser or dirty lens Try a known good disc or the YEDS 18 test disc P N 3 702 101 01 If the Vp p RFO is still low clean the lens Missing Information Layer When a chunk of information is missing there is a loss of light returned to the detectors The RF level drops low at this time and there is a click in the audio wh
36. en this disc area appears because the audio cannot be com pensated for so muting is the last alternative lii Missing info layer skipping Black spot If the stamped disc remains too long on the die the plastic may be burnt black During PB this black spot causes a momentary loss of RF which momentarily mutes the music causing clicking sounds Disc Scratches Black spots Light scattered lost RE III WD 5 M dd Pit Deformed poor Focus loss light cancellation Scratched Disc A scratched disc will scatter some laser light as the laser enters the disc Since this light will be lost the RFO voltage will be reduced If the scratch is small the lost data is electrically error corrected or predicted in the electronics If the scratch is larger muting will occur If still larger mo mentary loss of focus and skipping will occur Pit Deformed As the CD manufacturing stamping die wears the shape of the pits on the disc may not be molded to the correct shape or depth This causes the RF voltage to not have enough depth reduced Vp p when played back Troubleshooting Using the RFO Waveform pu mi Li Wii im AMAA 1 4 4 4 M A i RFO during PB of a scratched disc Notches in the envelope appear on top and sometimes bottom 1 2Vp p Normal RFO Eye pattern Time base 0 5msec div
37. enable low 1 of 14 Address lines WE write enable low 1 of 8 Data lines Time base 10msec div IC502 pin 20 27 Channel 15 At each address location the data is read while the write enable line WE Ch 3 is HIGH This data Ch 4 is sent to Syscon IC501 for compari son Meanwhile disc detector Q801 will place a HIGH at IC501 pin 38 if there is NO disc at that slot location If the memory also shows there is NO disc at this location the two pieces of information agree and there is no change to the memory data If they do not WE goes LOW Ch 3 while still at that same address location Ch 2 and the new data from IC501 pin 38 is placed into memory Reading from Memory The memory reading operation can be seen in the second scope shot This was taken with no disc chucked and the rotary encoder knob turned to move the tray table At each tray slot the memory location was read to see if there is a disc at that slot S RAM MSM5256DFP DO DISC LOW NO DISC HIGH CN80804 EY J CD LOCATION amp LABEL STORAGE 8A122 1248 7 5 00 24 PM3394 FLUKE amp PHILIPS TT tt ttt Anc RH x CH1 5 40 V ears Pru nw Art nnn vn CH3 5 0 V Lensisidoiv CH chi raga Reading the Tray Table Information Channel Name IC502 pin 1 CE chip enab
38. er D508 Q327 e and Q425 e 5 Reset 5V Reset IC505 Syscon IC501 not shown FL Driver IC701 LED Driver IC702 not shown 6 3 7Vac Power Transformer Fluorescent Display Tube T901 filament 7 28V Q501 emitter Reference voltage for the Fluorescent Display 11 5V Source 13 5V Source When the CD Changer is plugged into AC this voltage is applied to the primary winding of T901 The secondary winding that is center taped applies 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 become the 13 5V source voltage 5Volt Source The 11 5V source voltage is reduced and regulated by IC504 to produce the 5V source voltage for the CD Changer 5Vdc The 11 5V source voltage is reduced by R505 and R508 and applied to 5 1 volt zener diode D508 for shunt regulation Shunt regulation is when a device like this variable resistance zener diode is placed in parallel with the load The zener diode resistance varies to keep the voltage at the load 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 ON and OFF and when plugged and unplugged from AC D509 and C505 are used to insure there is sufficient voltage for the mute operation when the
39. hat receives TEO supplies current to generate a magnetic field in the tracking coil The coil moves the objective lens with laser beam so the beam follows tracks the disc data 33 Spindle Motor Like the focus serve the spindle motor servo has two modes of operation As soon as focus is found the spindle motor is kick started and runs to approximately the correct speed This is the first mode of the spindle motor operation The second mode comes some time later after the tracking servo oper ates This is when the RFO data is reliable and can be used to govern the spindle motor speed This second mode of operation cannot be seen because the motor is already running However when the motor is linked to the disc data the LOCK test point goes HIGH Spindle Driver M Optical Assembly Servo Control A D detectors Audio Block Once the spindle motor is locked to the data LOCK HIGH the data is reliable enough to be audio processed The disc data comes into Servo Control as RFO It is error corrected digitally reconstructed and output as a digital signal to the rear panel jack The digital signal is also con verted to analog within Servo Control and delivered to the rear panel L amp R jacks While audio is output the front panel display is receiving the CD track and playback time information Servo Control sends Sub Q digital data and clock to Syscon for compiling and interpreting The resultant infor
40. he user has turned the knob and rotates the tray accordingly Tray Table Position Sensors Three sensors monitor the gaps in the tray table s rings to determine home position Sensors IC802 and IC803 are used to determine the center of each disc slot Sensors IC801 and the composite signal from IC802 and IC803 are used to determine where the tray is positioned For testing purposes when the tray table is in a detent position sensors IC802 and IC803 should output a HIGH at CN506 pins 1 and 2 Sensor IC801 outputs a HIGH when certain disc slot positions have been se lected The chart lists the disc positions IC801 will output a high in the current 200 disc changers With the door open you can rotate rotary encoder and verify the disc positions in case the chassis has been bent or incorrectly aligned Disc positions when IC801 Output HIGH CN506 4 Disc Positions Number of disc slots 4 displayed on the tray 10 18 50 60 0 Ko 130 134 a 150 155 170 176 190 197 N MEMO SEARCH INPUT DOOR S623 5622 S621 N NEUTRAL POSITION D DETENT POSITION FRONT PANEL JOG BD DISC PB BUTTONS 6611 6617 R612 R618 vorTAGE RE601 KEY 3 3 KEY 2 2 ale SYSCON CXP84340 802 IC803 HOME FLAG TABLE MOTOR DRIVE 20 R565 IC802 FLAG RING TABLE TRAY MOTOR M801 R566 INTERRUPT SENSOR IC503 LOCATIONS CXA1291P 2 3 i IC802
41. hree position command mode slide switch next to the Control A jacks of the newer CD Changers The older changers are considered in position one 1 The command switch selects the CD player number This is useful if you want to control the CD Changers independently or as a group If you want to control the changers independently you would assign each changer a different position number Then if you wanted to select a disc from the second changer by remote side the remote s CD switch to 3 to access changer 49 If you want to group two changers for combined features so they operate together place two of the changers into position 2 Then you can use some of the features that share changer operation like Displaying Cus tom Files on the TV screen Program Play or Cross X Fade Playback Defective Discs Various problems can be found in CDs that cause skipping or clicking sounds momentary muting when played Close examination of the RFO waveform can identify a defective disc Normal RFO At start up laser light from the optical assembly is reflected from the infor mation layer of the disc to the optical assembly detectors This returned laser light causes the RFO voltage to go initially HIGH RFO at start of Play Initially NE 1 LOW voltage when a pit is encountered The information layer consists of a reflective mirror area and data pits of variable length These pits are of pr
42. ignal also goes high at times when grid 16 is not HIGH Ch 3 LOW This means a similar plate at a different grid is lit at this time i FL701 FL INDICATOR TUBE 28V EA OU oO FILAMENT oOloooggogaod VOLTAGE n p 65 R501 R701 ie D507 100k D505 T D506 30V zb 00 DN D501 THERMAL 2 1 JACK i BD C502 mE K I Q501 ic505 PST994D C507 bi l RESET m pe IC701 R506 FL DRIVER 4 6 2 3 3 mm MSM9202 03GS SYSCON IC501 30 45V L9 64 Osco OSC1 C506 V T OSC 2 48MHz Em R505 46 R706 SV p p D509 p 0505 SQ WAVE 508 45V TO MUTE TRANSISTORS D508 Q325 E Q327 E 5 1 Q425 E i slem 11 5V SOURCE TO IC506 REGULATOR 3300 16508 MOTOR DRIVER 13 5V SOURCE TO MUTE TRANSISTORS Q325 Q327 Q425 AND IC503 MOTOR DRIVER SYSCON C501 11 5V POWER SUPPLY CDP CX235 1A122 1238 10 7 7 00 Power On Once the CD Changer is plugged into AC pressing the front panel Power button permits Syscon to enable regulator IC506 1C506 outputs D 5V 7V and a reset signal to power the remaining devices on the BD board and turn on 2 LEDs to illuminate the disc door compartment AC Power Only When the CD changer was plugged into AC Syscon IC501 received power at pin 37 and was fully functional as marked by the X501 activity at pins 31 and 32 There is even data and
43. ing 0 1 2V 036 which is less than 2270 17 Press the GROUP 8 button to restore the tracking servo and examine the normal tracking waveform 18 Measure the TE waveform DC offset voltage It must be almost the same as the offset measured in step 13 If not there is metal fatigue in the lens supports of the optical assembly defective 52 RFO Level Check The RFO level must be at least 1Vp p Move the scope probe to the RFO test point on the same BD board While the disc is playing the output level should be at least 1Vp p spec is 1 2Vp p APPENDIX Control A Communications for Additional Features Control A is the name given to the Sony bi directional communications format used in Sony home audio devices The purpose of the communi cation is to automatically perform system functions and provide extra fea tures for the user Additional Features Additional features are gained when a CD Changer is connected to other Control A audio devices such as CD Players Mini Disc Recorders Re ceivers etc These features are related to the devices connected to the CD Changer Receiver CD Changer Automatic Function Selection When the CD Play button is pressed the receiver will switch to the CD input Both audio devices must already be powered ON Mini Disc or Tape Recorder CD Changer Automatic Function Selection When the recorder s Play button is pressed the receiver will switch to the Aux Mini Disc
44. is 200 disc model are similar to the 300 disc CDP CX300 series and 400 disc CDP CX400 series CD Changers In these larger capacity models the CD transport and CD mechanism use fewer parts As a result the higher capacity Changers require fewer adjustments Generally the electrical troubleshooting procedures and test modes out lined in this training manual can be applied to all of the changer models listed for the last three years This is because for troubleshooting pur poses they are electrically similar Mechanically the 200 disc Changers use one basic chassis and the 300 and 400 disc Changers use another chassis so the mechanical adjustments differ Model CDP CX90ES CDPCX 270 The model CDP CX90ES CDPCX 270 was carried over from the 1998 year because it was the only chassis that had the following major fea tures e A video output for an on screen display using a TV e A front panel jack that permitted a computer keyboard to be plugged in This allowed the user to label or re label each CD slot location quickly using the keyboard instead of the slower remote control Model CDP CX235 The board layout of the CDP CX235 is shown The bulk of the electronics are 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 boards along the bottom of the chassis hold the tray table and disc sensors The top illumination board houses 3 LEDs to light the disc compa
45. k In the following scope shot the RFO waveform in channel 1 shows the laser is seeing alternate areas of RF data teeth and no data gaps Channel 2 shows there is TE correction signal generated from IC103 pin 19 but it is not reaching the tracking coil for correction ch1 RE 1 28 chi NE ch2 MN PLLA i M A Tl BUR e i Defective Tracking Servo Waveforms Channel Signal Name Location RFO test point IC103 pin 16 TE test point IC103 pin 13 Time base 100msec div ground is taken at Vc IC103 pi Spindle Servo Although the spindle motor has started when focus was found FOK HIGH its lock onto the data does not occur until about 800msec later At that time the LOCK signal goes HIGH NE T wn Eee onore do v i L Channel IC103 pin 16 IC101 pin 24 LOCK test point IC101 pin 25 C2PO test point IC101 pin 19 Time base 200msec div ground is taken at Vc A J N Scope At this time the RFO signal should be at least 1Vp p 1 2Vp p normal and the RFO waveform should be straight on top and bottom no drop outs Once the LOCK test point goes HIGH the servos are all working and au
46. knob is turned to the next detent position the display shows the information on the next disc in the tray If that disc is desired the same encoder button is pressed Enter and that disc is accessed When the disc door is open the rotary encoder rotates the tray to any disc slot position permitting the user to load discs The FL display tube dis plays the same disc slot number marked on the tray at the opened door With the door closed the display tube shows the disc slot facing the CD Mechanism Rotary Encoder knob Display Front Panel The rotary encoder switch is connected to Syscon at IC501 pins 42 and 43 respectively At the encoder itself there are three contacts for the rotary encoder and two for the enter button In the detent position pin 1 is connected to pin 2 ground In the neutral position in between detents pin 3 is connected to pin 2 Rotary Encoder rear view 3 2 1 19 Direction of Rotation The encoder is constructed so its direction from the detent position can be determined by IC501 In the detent position pin 1 is grounded In the neutral position pin 3 is grounded When turning the encoder knob in the CCW direction both pins 1 and 3 are momentarily grounded before pin 1 is ungrounded make before break in neutral When turning the en coder knob CW both pins 1 and 3 are open circuited before pin 3 is grounded in neutral This is how IC501 determines the direction t
47. le low 20 2 1 of 14 Address lines 4 3 WE write enable low 27 4 1 8 Data lines 15 Time base 10msec div Note that the Read Write channel 3 waveform remains HIGH indicating that only the memory reading operation takes place Label and disc availability data outputs as each tray table slot was addressed In this CD Changer example there were no labels stored in memory so very little data is present at channel 4 Display Information When the door is closed and the rotary encoder is turned the memory is checked for the next occupied slot location As the tray moves the disc toward the CD Mechanism the label information is output At each tray slot location where there is a disc the corresponding Label information is sent to Syscon IC501 IC501 reorganizes the data and sends the applicable information to the FL Display Driver IC701 If there was no label information only the disc number is sent The Display IC assigns 25 segments to display this information on the front panel display tube The following waveforms show the data clock and latch signals from IC501 Io aidisplay whenipowerd m i ch3 ous s qo v IC501 IC701 Communications Power ON Channel Name IC501 pin 1 Data 1 2 Clock 2 3 Latch 4 Time base 200msec div Oddly even when the CD Changer is
48. lses at the right of the C2PO waveform des ignate disc scratches causing uncorrectable errors Disc Scratches i uae AM CD Playback Starting C2PO tp Signal Name Location C2PO test point IC101 pin 19 Time base 200msec div Scope ground is taken at Vc IC103 pin 12 50 51 5 Plug the CD Changer into AC to enter the test mode Optical Assembly Tests 6 Press the Front panel CHECK button to activate and repeat focus There are three basic checks for the optical assembly search An S curve waveform should appear S Curve Check In this procedure you will check the A D detectors to see if they are bal anced with sufficient output level to produce RFO for play A 1 1 Load a YEDS 18 test disc into the CD changer so it is chucked e v PK B 2 Unplug the CD Changer from AC 3 Connect the DC coupled scope to FE1 on the BD board BD BOARD Side B The S curve should be between 2 to 4Vp p and must be symmetrical above and below the base line A B 7 Unplug the AC to escape from the ADJ test mode TP O e E F Balance Check FE mos In this procedure you will check the E amp F tracking detectors Defective ere aro detectors will cause skipping TP TE me o 8 Plug the CD Changer into AC and press the Power On button o TP FE2 FET 1C103 4 Jump ADJ o
49. mation is sent to the FL Display Driver as Data Clock and Latch signals The Display driver determines what display segments of the tube have to be lit to produce the desired time and track characters PICKUP ASSEMBLY O RF 0 EYE PATTERN ANALOG AUDIO SERUG OUT COIL MOTOR CONTROL DIGITAL DRIVE DIG SIGNAL OUT PROCESS DSP DISPLAY TUBE PLATE GRIDS LOADING SW S801 DISC CHUCKED 2 FL DISPLAY USER y DRIVER PUSH BUTTONS LIMIT SW S101 OPTICS AT HOME POSITION SERVO AUDIO PROCESS BLOCK 9A1221251 6 29 00 34 Servo Processing There are several main servos that can be tested for normal operation Sled Motor Drive When the power On button is pressed the sled motor is driven inward until the optical assembly that is connected to it closes the 9101 limit switch This closure places 5V at IC101 pin 27 so it may turn on the servos to begin the disc playback sequence Laser The Laser servo is the first to be turned on when the S101 limit switch is closed and the loading switch is in the disc chucked position IC101 pin 14 outputs a HIGH 5V to RF Amp IC103 pin 22 to enable the laser servo The laser diode and light sampling photodiode are in the optical assembly and the remainder of the regulating circuit is in IC103 with Q101 as an external amplifier 1C103 pin 3 drops from 5V to about 3V to turn on the laser Q101 turns on supplying current to the laser diode at pin 10 of the
50. n a disc to be skipped not played S RAM Operation IC502 is an S Ram that stores bits of data using low power CMOS logic gates A one Farad capacitor C522 provides power to IC502 when the CD Changer is turned OFF preventing the loss of data for up to a month When the CD Changer is ON Syscon IC501 can read or write into each location of the memory by first enabling IC502 CE LOW addressing a memory location selecting read WE HIGH or write WE LOW and finally reading or writing the information This S RAM stores the informa tion 8 bits at a time so a single address location reads or writes a Byte of data 8 bits Writing to Memory The memory writing operation can be seen in the first scope shot It was taken as the disc door is closing and the tray is rotating press the Close Door button At this time every disc slot is being checked for discs as the tray rotates If the memory information does not agree with the con tents of the disc slot the memory is rewritten to with the current informa tion Channel 1 shows that S RAM IC502 is enabled at power ON Only one of the 14 address lines is represented in channel 2 As the tray rotates IC501 sends its corresponding address to IC502 23 x SEE TET ch2 N ak PT Un d EEH Syscon Checking the Tray for Discs Name CE chip
51. n the Main board to ground 9 Touch your DC coupled scope to the Vc test point on the BD board and mark this reference position on the scope with masking tape Vc will be about 2 5Vdc 10 With the disc still chucked and the ADJ test point grounded move the Scope probe to the TE test point on the BD board 11 Press the to select track 5 and press PLAY 12 Press the front panel GROUP 3 button to disable the tracking servo The small 0 5Vp p tracking error signal will change to a large 1 4Vp p traverse wave Normal Tracking error f T Vc iti pig Padi waveform 0 5V div A Traverse ih waveform n Vc PAE LM RR MIBidOmsPKD roht sis tiiiitiriitiiii 0 5V div 13 The Traverse waveform should be no smaller than 0 7Vp p 14 Measure the DC voltage from the Vc reference to the center of the waveform offset voltage As the optical assembly ages these two will not be the same In this example Vc is the same point as the center of the waveform so step 14 OVdc offset 15 Divide the offset voltage measured in step 14 by the waveform s Vp p and multiply by 100 The result must be less than 22 Offset DC voltage Traverse Wave Vp p X 100 imbalance 16 In our example the waveform is 1 2Vp p Divid
52. nd opens the 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 To get the electrons to the plate the plate must have a positive voltage to be attractive E Pl oS o Simple FL Tube 2 Structure Filament Grid Plates Grid amp Plate Array 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 G2 ee ne G OP Pl G P4 PS 2 cy P5 P3 P6 P3 P6 o o P3 To make a specific plate glow a grid structure is selected and a positive voltage is applied to it At that time the plate structures that must glow are also brought positive In the diagram above when G1 and P3 lines are brought HIGH the P3 plate in the G1 structure will glow Even though the P3 structure in the G2 structure is connected in parallel receiving the same 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 Plate and Grid Structures Fluorescent Driver IC701 When 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 this 2 48MHz oscillator 16MHz is on the schematic are located at IC701 pins 58 and 59
53. nnel Name CN501 pin FL CLK Cook FL LT Latch Time base 50usec div DOOR LUMINATION D 5V IC506 LA5616 SOURCE XRST TO IC101 8 102 15 MUTE MAIN BD Q325 Q327 Q42 SOURCE TO DRIVER IC102 B BD IC701 i FL DRIVER DISPLAY BD SYSCON 68 44 CXP84340 075Q 60 ae DSP BD BD POWER ON 2A122 1242 6282000 12 Communications IC501 IC101 Communications from Syscon to Servo Control until the disc is chucked on the spindle motor and IC101 does not occur ready to play after the loading motor finishes chucking the disc This communications is shown chi L P i e ALL TUL ch2 1 ch3 L TTTWITTTT II Consis dov CHR MTBilooms 3laddu cho IC501 Activity at CD Play Time base 1msec div Channel Name CN502 pin 1 Data 18 2 CLK Clock 20 3 XLT Latch 19 DOOR LUMINATION D 5V IC506 LA5616 SOURCE XRST TO IC101 8 102 15 MUTE MAIN BD Q325 Q327 Q42 SOURCE TO DRIVER IC102 B BD IC701 i FL DRIVER DISPLAY BD SYSCON 68 44 CXP84340 075Q 60 ae DSP BD BD POWER ON 2A122 1242 6282000 14 Door Motor Drive The sliding door in the model CDP CX235 was an improved feature over the previous manual trap door that the user pulled down to access the
54. oward the spindle motor until the limit switch is closed If this switch doesn t close the laser and focus search will not take place and the CD will not spin M Servo Control Limit switch S101 Focus Search The focus operation is divided into search and servo parts Servo Control starts focus search when it knows the sled is at home position S101 and the CD Mechanism enters the chucked position cam switch S801 Servo Control makes a ramp voltage used to drive the objective lens through its full length of travel moving the distant focus point along with it focus Focus coil in optical assembly AW Servo Control 9101 9801 Focus Servo When the laser focuses on the disc s reflective information layer light is returned to the optical assembly detectors The A D detectors are output to the RF Amplifier The RF stage not only amplifies the level but also matrixes the signals to produce FE and RFO signals FE is an output signal used to identify and maintain focus when finally applied to the fo cus coil of the optical assembly RFO is the main signal that will be processed into audio if the servos all work Servo Control receives the FE signal and uses it with RFO to determine when focus has been found during focus search Focus is found when the FOK test point goes HIGH This is when Servo Control replaces the PICKUP ASSEMBLY O RF 0 EYE PATTERN ANALOG AUDIO
55. playback Generations of Control A There are three Control A software formats The formats are backwards compatible Control A Used on early 50 and 100 disc CD Changers enabling the auto function selection and Syncro Recording features The first genera tion used a 3 5mm stereo miniplug instead of the current mono plug used in future generations Connecting old and new units using a stereo to mono cable can make them hardware compatible Control A1 Used on 200 disc CD Changers permitting more system features as listed enabling automatic operations associated with inte grated systems This second generation format began the use of a 3 5mm mono miniplug for bi directional communications Control A1 Il Began on the 300 400 disc CD Changers in the year 2000 The version II software additions to the changer s microprocessor permits audio video system functions that are not at full potential as of this writing Control A Hardware Connections Connecting the audio devices for communications requires a coax cable 2 meters max length with a 3 5mm mono miniplug at each end Each audio device is linked to another using these cables forming a series The cable plugs into either one of the two Control A jacks at the rear of the audio device the receiver only has 1 jack so it must be at the end of the path Mini Disc Recorder Tape Recorder Receiver CD Changer 1 CD Changer 2 There is a t
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57. reates additional digital samples oversampling to reduce noise in the final analog audio 9 Converts the signal from digital to analog form D A Converter Analog audio is output from IC 101 to the rear panel jacks LINE OUT OPTICAL PICK UP ASSEMBLY KSS213B DIGITAL OPTICAL COIL amp OUTPUT MOTOR ERROR i JACK BD DRIVER SIGNAL M TRAY SWITCHOR IC501 LOADING SENSOR MAIN BD FRONT E PANEL BUTTONS 13 5V SOURCE IC FL DISPLAY FL DISPLAY TUBE SW 45V SOURCE DISC DOOR DRIVER pem DISPLAY BD POWER IC506REG D 5V RESET AUDIO 11 5V MUTE SOURCE 28V FILAMENT SOURCE VOLTAGE OVERALL BLOCK DIAGRAM MODEL CDP CX235 OA1221251 7 5 00 Power Supply Display Overview The power supply stage produces seven voltages when the CD Changer is plugged into AC Some of these voltages from the main board power the FL Driver microprocessor IC701 and the FL indicator tube on the dis play board Power Supply Power Supply Output Output Voltage From Destination 1 11 5Vdc Bridge Rectifier Regulator Sw D501 4 5V Regulator IC504 Motor Driver IC503 2 13 5Vdc Bridge Rectifier Audio mute transistors D501 4 Q325 e Q327 e and Q425 e Motor driver IC503 Syscon IC501 not shown FL Driver IC701 3 5Vdc Source Regulator IC504 4 5Vdc Bridge D501 4 amp Mute transistors Q325 e Zen
58. ring the RFO and tracking error signal permits you to see if the optical assembly is weak and check the tracking stage at the same time 47 ona x M iil chau tira L ra a da aaa da a ra laura RFO and TE Tracking Channel Signal Name 1 HFO test point 2 TE test point Time base 100msec div Scope ground is taken at Ve_ IC103 pin 12 signals Location IC103 pin 16 IC103 pin 13 Tracking Servo The tracking servo consists of an electronic closed loop circuit The loop is completed by Servo Control as soon as focus has been identified using the FE signal SPINS DOES NOT READ TOC CHECK CHECK RFO LEVEL TRACKING ok IS LOCK HIGH POWER 9K 1 ovpip SERVO IC101 TP SUPPLY MINIMUM TE DURING WAVEFORM DISC SPIN REPAIR IS C2PO LOW SUSPECT REPLACE IC101 TP SLED BINDING PARAMETERS SPINDLE DURING DISC OPTICAL SE ASSEMBLY MOTOR MOTOR OR RIBBON CABLE DRIVER IC ITS DRIVER IC DRIVER IC IS DEFECTIVE IC101 SUSPECT DEFECTIVE OPTICAL ASSEMBLY RIBBON CABLE Q101 NO BD BOARD SERVO IS WORKING SQDATA CLOCK FROM IC101 NOT GETTING TO SYSCON DISC SPINS BUT DOES NOT READ TOC FLOWCHART 13A122 700 48 Optical Servo Assembly Control When the tracking loop is broken the TE waveform changes from what looks like 5Vp p of noise to a large broken waveform of 1 5Vp p Ch 2 The RFO
59. rtment when the CD Changer is powered on Overall Block Diagram At 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 user s commands for a disc to play 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 switches linked to the Door Tray Table and Loading Motors Information Gathering Pressing the power ON button causes IC501 to use IC SW to switch on regulator IC506 1C506 apples power to the BD board which houses the optical 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 memory IC Data about the disc last loaded in the CD Mechanism is returned to IC501 The disc label information is output as data to the FL Display IC for display on the front panel fluorescent tube If there was no label infor mation then just the disc s 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 th
60. turned OFF Syscon is sending data clock and latch signals into FL Driver IC701 ch1 NI 3 Lena s do v IC501 IC701 Communications Power OFF S RAM MSM5256DFP DO DISC LOW NO DISC HIGH CN80804 EY J CD LOCATION amp LABEL STORAGE 8A122 1248 7 5 00 26 Disc Loading Drive The purpose of the Disc Loading Drive stage is to rotate a cam that moves levers to Lock the tray table after it has stopped Grasp the disc from the tray table Guide the CD into the CD Mechanism Clamp the CD onto the spindle motor shaft chucking Release the CD when the cam reaches the end of travel Once the tray table has stopped the Disc Loading Drive has the job of getting the disc out of the tray table and placing it into the CD Mechanism for play From an electronic point of view all that has to be done is to rotate the Disc Loading Motor The remainder is mechanical and is ad dressed in the overview and during alignment Operation The electrical operation of this stage is similar to the Door Motor Drive After disc is placed on the tray table Syscon IC501 positions the disc in front of the CD Mechanism The loading motor is powered to load the disc into the CD Mechanism Loading Motor Drive Voltage Cam Direction IC501 pin 26 IC501 pin 27 IC503 pin 3 F
61. unction CW Chucking 3 1V CCW Unchucking OV 27 Motor Stop Just before the cam reaches the end of travel it toggles the S801 switch on the L SW Board The switch grounds IC501 pin 55 or 67 depending upon the direction of rotation A LOW voltage instructs IC501 to discon tinue the loading motor drive voltage The loading motor stops 508 CXA129IP 3 3 IC501 LDOT SYSCON CXP84340 LDIN IN SW OUT SW DISC LOADING DRIVE 28 CN505 806 S801 CN902 808 L MOTOR BD BD CHUCKED NEUTRAL CAM CCW UNCHUCKED 6A122 1247 6 29 00 Optical Pickup The Optical pick up assembly is the single most complicated device in the CD player The Optical assembly has several parts The laser and objective lens Focus coil Tracking coil Detector assembly Each part has a role in the playback of the disc information The Laser and Lens The laser diode is powered by a regulated voltage LD Within the as sembly is a photodiode that monitors the laser light intensity This infor mation PD is fed back to the circuitry to regulate the LD drive voltage The laser light is channeled through an objective lens towards the CD The convex objective lens funnels the laser beam into a focused point near where the disc s shiny information layer should be Focus Coil The objective lens has a coil of wire attached to it in two planes A station ary piece of metal is adjacent to it for magnetic reference
62. unit is unplugged C505 holds the 5V for the mute transistors and diode D509 blocks this voltage from being used by the loads on the 11 5V line D509 anode Reset 5V When the 5Volt Source voltage outputs regulator IC504 IC505 creates a reset pulse using R506 and C507 Each one of these three parts has a role in creating the reset pulse When the source voltage is input IC505 IC505 holds it output LOW for a fixed amount of time dependent upon IC505 s design This LOW grounds out C507 at the output When the IC505 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 to a device is held LOW while power Vcc is applied i FL701 FL INDICATOR TUBE 28V EA OU oO FILAMENT oOloooggogaod VOLTAGE n p 65 R501 R701 ie D507 100k D505 T D506 30V zb 00 DN D501 THERMAL 2 1 JACK i BD C502 mE K I Q501 ic505 PST994D C507 bi l RESET m pe IC701 R506 FL DRIVER 4 6 2 3 3 mm MSM9202 03GS SYSCON IC501 30 45V L9 64 Osco OSC1 C506 V T OSC 2 48MHz Em R505 46 R706 SV p p D509 p 0505 SQ WAVE 508 45V TO MUTE TRANSISTORS D508 Q325 E Q327 E 5 1 Q425 E i slem 11 5V SOURCE TO IC506 REGULATOR 3300 16508 MOTOR DRIVER
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