Jvc-CHX-400-Service-Manual 电路图 维修手册.pdf

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1、SERVICE MANUAL COMPACT DISC AUTOMATIC CHANGER No.49585 Dec. 2000 COPYRIGHT 2000 VICTOR COMPANY OF JAPAN, LTD. CH-X400 / CH-X450 CH-X400 / CH-X450 Contents Safety precaution Important for laser products Location of main parts Removal of main parts JC 12 Forced eject procedures 1-2 1-3 1-4 1-5 1-19 Tr

2、oubleshooting Wiring connections Pickup replacement procedure Description of major ICs 1-20 1-26 1-27 1-29 This service manual is printed on 100% recycled paper. Area Suffix JNorthern America EContinental Europe CH-X400 UOther areas CH-X450 RadioFans.CN 收音机爱 好者资料库 CH-X400/CH-X450 1-2 ! Burrs formed

3、during molding may be left over on some parts of the chassis. Therefore, pay attention to such burrs in the case of preforming repair of this system. Safety precaution ! Please use enough caution not to see the beam directly or touch it in case of an adjustment or operation check. RadioFans.CN 收音机爱

4、好者资料库 CH-X400/CH-X450 1-3 Important for laser products 1.CLASS 1 LASER PRODUCT 2.DANGER : Invisible laser radiation when open and inter lock failed or defeated. Avoid direct exposure to beam. 3.CAUTION : There are no serviceable parts inside the Laser Unit. Do not disassemble the Laser Unit. Replace

5、 the complete Laser Unit if it malfunctions. 4.CAUTION : The compact disc player uses invisible laserradiation and is equipped with safety switches whichprevent emission of radiation when the drawer is open and the safety interlocks have failed or are de feated. It is dangerous to defeat the safety

6、switches. 5.CAUTION : If safety switches malfunction, the laser is able to function. 6.CAUTION : Use of controls, adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure. VARNING : Osynlig laserstrlning r denna del r ppnad och sprren r ur

7、kopplad. Betrakta ej strlen. VARO : Avattaessa ja suojalukitus ohitettaessa olet alttiina nkymttmlle lasersteilylle.l katso steeseen. ADVARSEL : Usynlig laserstrling ved bning , nr sikkerhedsafbrydere er ude af funktion. Undg udsttelse for strling. ADVARSEL : Usynlig laserstrling ved pning,nr sikker

8、hetsbryteren er avslott. unng utsettelse for strling. REPRODUCTION AND POSITION OF LABELS WARNING LABEL DANGER : Invisibie laser radiation when open and interlock or defeated. AVOID DIRECT EXPOSURE TO BEAM (e) VARNING : Osynlig laserstrlning r denna del r ppnad och sprren r urkopplad. Betrakta ej st

9、rlen. (s) VARO : Avattaessa ja suojalukitus ohitettaessa olet alttiina nkymttmlle lasersteilylle.l katso steeseen. (d) ADVARSEL :Usynlig laserstrling ved bning , nr sikkerhedsafbrydere er ude af funktion. Undg udsttelse for strling. (f) !CAUTION Please use enough caution not to see the beam directly

10、 or touch it in case of an adjustment or operation check. Caution. This production contains laser component of higher laser class than Class 1. Top panel of the unit Gerateoberseite Panneau superieur de lappereil RadioFans.CN 收音机爱 好者资料库 CH-X400/CH-X450 1-4 Location of main parts Bottom view Top side

11、 view Remove the main board view Main board assyMechanism assy wire Jack board assy Mechanism board assySensor board assy Positioning motor assy Mechanism Digital: 0) RF signal Focus Servo Loop ON TERMINAL Microprocessor commands Microprocessor commands Tracking Servo Loop ON Servo CLV Rough Servo A

12、ccelerAccelerationationAcceleration Microprocessor commands Spindle motor (+) 20 FMO TC9462 53 CN502 5 or CN503 22 CH-X400/CH-X450 1-23 Turn the power on with no magazine loaded. Reset Move the lifter until it comes to the STOP position (shipping position). Connect the receiver, etc. and turn the po

13、wer on. Set to the changer mode. CD changer indication appears on the receiver, etc. Load the magazine. Is the disc pulled out to start play? Is voltage present at IC521 pin z 2.5 V while the disc rotates? Is the disc taken out? Is the disc rotated? Is track selection or search performed correctly?

14、10. Is the playback sound normal? Normal Proceed to the Signal Processing section. Proceed to the Tracking section. The lifter moves up or down and stops. The position motor does not function. The tray motor goes forward and back several times. Check the connections to the receiver or the circuits i

15、n the vicinity of IC651. Check the linear position sensor (VR601). Check the wiring of the CD 9 V power supply position motor. Check the TRAY-IN and TRAY-OUT switches. Exchange discs, then check whether or not the feed motor moves. Set from the STOP to PLAY mode, then check that the triangle wave ap

16、pears at IC581 pins H and I . Does the laser emit? Check the MAG SW, TRAY-IN, and TRAY- OUT switches. Proceed to the Focus section. Proceed to the Focus section. Proceed to the Signal Processing section. Check the RESET switch and feed section Check the vicinity of IC501 6and 7. (Refer to the Feed s

17、ection). YES YES YES YES YES YES YES YES YES YES YES YES YES NO NO NO NO NO NO NO NO NO NO NO NO NO General section CH-X400/CH-X450 1-24 Feed section Focus section Tracking section Spindle section Is the voltage output at IC521 pin u 5V or 0V? Check the feed motor. Is 4V present at both sides of the

18、 feed motor? Is the wiring for IC521 (90) (100) correct? Check IC581. Is 6V or 2V present at IC581 Q and R? Is 5V present at IC581 pin 6? Check the feed motor connection wiring. Check the vicinity of IC521. Check CD 9V and 5V. YES YES YES NONO NO NO YES YES When the lens is moving: Check the circuit

19、s in the vicinity of IC581 pins H K. Check the pickup and its connections. NO YES YES Does the S-search waveform appear at IC581 pins H and I? Is the disk rotated? Does the RF signal appear at TP1? Is 4V present between IC581 pins 1 and 2? Check the spindle motor and its wiring. Is 4V present at IC5

20、21 pin x? Check the vicinity of IC581. Check IC501 and IC521. YES NO NO NO NONO YES YES YES Check the circuits in the vicinity of IC501 J O or the pickup Is the RF waveform at TP1 distorted? Proceed to the Tracking section When the disc is rotated at first: Check the circuit in the vicinity of IC501

21、 pins 2C. Check IC521. Check the pickup and its connections. YESYES YES Is the tracking error signal output at TP3? Approx. 1.2 V 4V CH-X400/CH-X450 1-25 Signal processing section No sound from either channel. Is 9V present at IC101 pin (8)? Compare the L-ch and R-ch to locate the defective point. I

22、s the sound output from both channels (L, R)? Check the vicinity of the Q981 audio power supply. NO NONO NO YES YES YES YES YES Check IC521 and its peripheral circuits. Is the audio signal (including sampling output components) output to IC521 pins and | during Is the audio signal output at IC101 pi

23、ns 1 and7during playback? NOCheck IC101 and its peripheral circuits Check the muting circuit. Normal ABC 1 2 3 4 5 Wiring connections Wiring of mechanism board section Feed Motor Assy QUQ710-2614BJ QUQ110-1013BJ Connect Board CN503CN904 CN601 WJM0017-002A CN903 Spindol Motor Assy Mechanism Board Ass

24、y (SURFACE SIDE) Sensor Assy Tray Motor Assy CN501 CN502 Pick Up Assy LV30450-003A 1-26 CH-X400/CH-X450 CH-X400/CH-X450 1-27 1 Third gear Main PCB assembly Feed motor assembly 1 2 2 2 3 CN502 CN501 Unsolder Lifter bracket (L) Fig. 49 Fig. 50 Tray motor assembly Unsolder Traverse mechanism PCB assemb

25、ly Grounding point Fig. 51 Pickup assembly Shaft holder Spindle motor Pickup replacement procedure Note: When replacing the pickup, be sure to apply countermeasures against static electricity (grounding the operation table, wrist band and soldering iron). To remove it, first short-circuit the ground

26、ing point on the mechanism PCB, then lift the mechanism PCB assembly with CN501 connected. Next, short-circuit the grounding point on the pickup main unit, then unplug the pickup flexible PCB from connector CN501. When reassembling, perform in the reverse order. 1. Remove the bottom cover, front pan

27、el and top cover from the exterior section. 2. Unplug the flexible ribbon wire from connector CN502 on the traverse mechanism PC board assembly. 3. Turn the rear slider and third gear in the lifter section counterclockwise until the traverse mechanism assembly is in the lowermost (bottom) position.

28、4. Unsolder the two wires (black and brown) connected to the tray motor. 5. Remove the two screws (1) from the round holes on the chassis R assembly to remove the lifter bracket (L). 6. Remove the lower rod. 7. Short-circuit the grounding point on the traverse mechanism PCB assembly of the lifter un

29、it. Unsolder the wires connected to the spindle motor (red, black) and to the feed motor (blue, white) to lift the PCB assembly. Next, short-circuit the grounding point on the pickup main unit and unplug the pickup flexible PCB from CN501. 8. Remove the three fixing screws (2) from the round holes o

30、n the chassis R assembly to remove the traverse mechanism PCB assembly. 9. Remove the pickup shaft holder fixing screw (3) to remove the pickup assembly. CH-X400/CH-X450 1-28 Shift approx. 30 mm Shift approx. 30 mm Fig. 52 Grounding point Pickup Feed slide shaft Rack arm 5 4 Shaft holder Middle gear

31、 3 Fig. 53 Fig. 54 Lifter unit lever Enlarged diagram 10. Remove the two rack arm fixing screws (4). Pull out the feed slide shaft. Remove the shaft holder fixing screw (5). 11. When mounting the lifter bracket after replacing the pickup, shift the lifter unit lever approx. 30 mm towards the inside,

32、 then mount the lifter bracket. CH-X400/CH-X450 1-29 DDDDDD DDDDDD x2x2 x2x2 x3/8x3/8 x3/8x3/8 LEVEL SHIFT VCCVCC VCCVCCVCC BIAS BIAS BIAS BIAS BIAS 13.3K 13.3K 13.3K 13.3K 100 100 100 100 LEVEL SHIFT LEVEL SHIFT LEVEL SHIFT LEVEL SHIFT LEVEL SHIFT 10K 10K T.S.D 123456789101112131415 323130292827262

33、52423222120191817 16 T.S.D: Thermal shut down circuit D: Driver buffer Unit of resistor: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 OUT1- OUT+ OUT2- OUT2+ IN 2 IN 1 VCC VCC REG-B REG OUT VCC IN3-R IN3-F OUT3+ OUT3- GND Driver CH1 negative output Driver CH1 positive output Driver CH2 negative output Driv

34、er CH2 positive output Driver CH2 input Driver CH1 input Power supply Power supply Connect to external TR.BASE Constant voltage output(5V)(*3) Power supply driver CH3 reverse input Driver CH3 forward input Driver CH3 positive output Driver CH3 negative output ground 17 18 19 20 21 22 23 24 25 26 27

35、28 29 30 31 32 OUT4- OUT4+ OUT5- OUT5+ IN 5 IN 4 VCC BIAS IN GND GND VCC IN6-R IN6-F OUT6+ OUT6- GND Driver CH4 negative output Driver CH4 positive output Driver CH5 negative output Driver CH5 positive output Driver CH5 input Driver CH4 input Power supply Bias input Substrate ground Substrate ground

36、 Power supply Driver CH6 reverse input Driver CH6 forward input Driver CH6 positive output Driver CH6 negative output ground Note 1) Positive output and negative output of phasing with input. Note 2) Loading positive output and loading negative output of phasing with mode. *3 Connect to external PNP

37、 transistor collector. No.SymbolFunctionNo.SymbolFunction 1.Terminal layout & Block diagram 2.Pin function BA5926S(IC581):CD/POSITION/TRAY DRIVER Descriprion of major ICs CH-X400/CH-X450 1-30 UPD780058GC-067(IC601):CPU 2.Block diagram 1.Terminal layout 80 61 21 40 1 20 60 41 PORT0 PORT1 PORT2 PORT3

38、PORT4 PORT5 PORT6 PORT7 PORT12 PORT13 REAL-TIME OUTPUT PORT EXTERNAL ACCESS SYSTEM CONTROL P00 P01-P06 P07 TO0/P30 TI00/INTP0/P00 TI01/INTP1/P01 TO1/P31 TI1/P33 TO2/P32 TI2/P34 SI0/SB0/P25 SO0/SB1/P26 SCK0/P27 SI1/P20 SO1/P21 SCK1/P22 STB/P23 BUSY/P24 S12/RXD/P70 SO2/TXD/P71 SCK2/ASCK/72 ANI0/P10- A

39、NI7/P17 ANO0/P130 ANO1/P131 AV33 AVREF0 AVss AVREF1 INTP0/P00- INTPS/P05 PCL/P35 BUZ/P36 P10-P17 P20-P27 P30-P37 P40-P47 P50-P57 P60-P67 P70-P72 P120-P127 P130-P131 RESET X1 X2 XT1/P07 XT2 RTP0/P120- RTP7/P127 RTP0/P120- RTP7/P127 A8/P50- A15/P57 RD/P64 WR/P65 WAIT/P66 ASTB/P67 V00 VssIC BUZZER OUTP

40、UT INTERRUPT CONTROL D/A CONVERTER A/D CONVERTER SERIAL INTERFACE2 SERIAL INTERFACE1 SERIAL INTERFACE0 WATCH TIMER WATCDOG TIMER 8-bit TIMER/ EVENT COUNTER2 8-bit TIMER/ EVENT COUNTER1 16-bit TIMER/ EVENT COUNTER1 CLOCK OUTPUT CONTROL 78K/0 CPU CORE ROM RAM CH-X400/CH-X450 1-31 Pin No. PORT Name I/O

41、 Function Active Pin No. PORT Name I/O FunctionActive 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 LCDDA LCDSCK LCDCE AVSS ADCOUT NC AVREF1 NC NC CDCHECK EPROMDI EOROMDO EPROMCK LED BUS I/O BUS SI BUS SO BUS SCK NC NC NC NC NC NC BUSO

42、UT CD ON PWR CONT POSMO+ POSMO- TRAYMO+ TRAYMO- BUCK VSS1 LSI RESET CCE BUS0 BUS1 BUS2 BUS3 NC O O O - O O - O O I I/O O I/O O O I O I/O O O O O O O O O O O O O O O - O O I/O I/O I/O I/O O H H H H H L LCD driver data output LCD driver clock output LCD driver chip enable output Connect to ground Powe

43、r on Hi output. Low in stop mode. Unused output port Connect to 5V Unused output port Unused output port CD check mode input. Reset only. EEPROM data input EEPROM data output. Hi durring input. EEPROM clock input/output Lifter LED output JVC bus input/output control(Lo:input) JVC bus data input JVC

44、bus data output JVC bus clock input/output Unused output port Unused output port Unused output port Unused output port Unused output port Unused output port JVC bus output CD power control Hi:on Power supply control output Hi:on Position motor control output Position motor control output Tray motor

45、control output Tray motor control output CD LSI data clock Connect to ground CD LSI reset CD LSI chip enable CD LSI data 0(open drain) CD LSI data 1 (open drain) CD LSI data 2 (open drain) CD LSI data 3 (open drain) Unused output port 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62

46、 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 NC NC NC MAG IN TRAY IN TRAY OUT REST NC EMPH NC BUFF CONT TEST RUN NC NC NC MUTE STAGE NC EPROM CLF RESET REMOCON PWR DET PWR SW BUS INT EJECT NC VSS0 VDD1 X2 X1 IC XT2 XT1 VDD AVREF0 L SENSOR KEY1 KEY2 KEY3 KEY0 O O O - O O I O O O O I O O O O

47、 I O I I I I I I I I - - O I - O I - - I I I I I L L L L H L L H L L L L Unused output port Unused output port Unused output port Magazine switch Lo:magazine inserted Tray retract switch Lo:retraction complete Tray extend switch Lo:extension complete Resr switch Unused output port Emphasis select ou

48、tput Hi:on Unused output port Buffer control output Test running input Unused output port Unused output port Unused output port Mute output. When reverse of earlier audio mute. Mute power OR output LCD,AD key,remote inhibit selector Low:inhidit Unused output port EEPROM clear input Functional only d

49、unng reset Reset input (includes flash write in function) Remote controller signal input Memory power detect input CRTL+B detect input JVC bus com start interrupt input Eject key input Unused output port Connect to ground Connect to 5V Oscillater (4.19430 MHz) Oscillater (4.19430 MHz) Connect to ground Open Connect to VDD Connect to 5V Connect to ADCONT Linear sensor input(8 bit A/D input) Key input 1 (8 bit A/D input) Key input 2 (8 bit A/D input) Key input 3