Jvc-KDLH-7-R-Service-Manual(1) 电路图 维修手册.pdf

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1、SERVICE MANUAL CD RECEIVER No.49724 Apr. 2002 COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD. KD-LH7R KD-LH7R Area Suffix E - Continental Europe EX - Central Europe Contents Safety precaution Preventing static electricity Important for laser products Disassembly method Adjustment method 1-2 1-3 1-4 1-5

2、 1-20 Flow of functional operation unit TOC read Maintenance of laser pickup Replacement of laser pickup Description of major ICs 1-21 1-23 1-23 1-24 7D SOUND VOLVOL SOURCERF U D RadioFans.CN 收音机爱 好者资料库 1-2 KD-LH7R ! Burrs formed during molding may be left over on some parts of the chassis. Therefor

3、e, 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 好者资料库 1-3 KD-LH7R Conductive material (conductive sheet) or iron plate

4、 (caption) Anti-static wrist strap Preventing static electricity Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs. 1

5、.2. Handling the traverse unit (optical pickup) 1. Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit. 2. Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific details, refer to the repl

6、acement procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to take too long a time when attaching it to the connector. 3. Handle the flexible cable carefully as it may break when subjected to strong force. 4. It is not possible to adjust the semi-fixed

7、 resistor that adjusts the laser power. Do not turn it 1.1.3. Handling the optical pickup 1. In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement optical pickup are shorted. After replacement, return the shorted parts to their origin

8、al condition. (Refer to the text.) 2. Do not use a tester to check the condition of the laser diode in the optical pickup. The testers internal power source can easily destroy the laser diode. 1.1.2. Ground yourself 1. Use an anti-static wrist strap to release any static electricity built up in your

9、 body. 1.1.1. Ground the workbench 1. Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing the traverse unit (optical pickup) on it. 1.1. Grounding to prevent damage by static electricity Static electricity in the work area can destr

10、oy the optical pickup (laser diode) in devices such as DVD players. Be careful to use proper grounding in the area where repairs are being performed. Connector board DET switch Pickup Pickup Short-circuit Joints b Short-circuit point (Soldering) Flexible wire RadioFans.CN 收音机爱 好者资料库 1-4 KD-LH7R Impo

11、rtant 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 the complete Laser Unit if it

12、 malfunctions. 4.CAUTION : The compact disc player uses invisible laser radiation and is equipped with safety switches which prevent emission of radiation when the drawer is open and the safety interlocks have failed or are defeated. It is dangerous to defeat the safety switches. 5.CAUTION : If safe

13、ty 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 urkopplad. Betrakta ej strlen.

14、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 sikkerhetsbryteren er avslott. unng

15、 utsettelse for strling. REPRODUCTION AND POSITION OF LABELS WARNING LABEL DANGER : Invisible laser radiation when open and interlock or defeated. AVOID DIRECT EXPOSURE TO BEAM (e) VARNING : Osynlig laser- strlning r denna del r ppnad och sprren r urkopplad. Betrakta ej strlen. (s) VARO : Avattaessa

16、 ja suo- jalukitus ohitettaessa olet alttiina nkymttmlle lasersteilylle.l katso steeseen. (d) ADVARSEL :Usynlig laser- strling ved bning , nr sikkerhedsafbrydere er ude af funktion. Undg udst telse for strling. (f) CLASS 1 LASER PRODUCT !CAUTION Please use enough caution not to see the beam directly

17、 or touch it in case of an adjustment or operation check. 1-5 KD-LH7R Press the release switch and remove the front panel unit in the direction of the arrow. 1. Disassembly method Removing the front panel unit (See Fig.1) Remove the two screws A attaching the front chassis. Remove the two screws B o

18、n each side of the body. Release the two joints a and the two joints b on the sides. Release the two joints c at the bottom and remove the front chassis toward the front. 1. 2. 3. Removing the front chassis (See Fig.2 4) Remove the four screws C attaching the heat sink on the left side of the body,

19、and remove the heat sink. 1. Removing the heat sink (See Fig.5) Joint c Heat sink Fig.2 Fig.1 Fig. 3 Fig.4 Fig. 5 Front panel unit Front chassis A B Front chassis Joint a Joint a Joint b Joint b CCC Joint c 1-6 KD-LH7R Prior to performing the following procedure, remove the front chassis and the hea

20、t sink. Turn the body upside down. Insert a screwdriver to the two joints d and two joints e on both sides of the body and the joint f on the back of the body, then detach the bottom cover from the body. 1. 2. Removing the bottom cover (See Fig.6) Prior to performing the following procedure, remove

21、the front chassis, the heat sink and bottom cover. Remove the six screws D attaching the rear panel and one screw E attaching the pine jack on the back of the body. 1. Removing the rear panel (See Fig.7 ) Prior to performing the following procedure, remove the front chassis, the heat sink, bottom co

22、ver and the rear panel. Remove the two screws F attaching the main amplifier board assembly on the top cover. Disconnect connector CN101 on the main amplifier board assembly from the cassette mechanism assembly. 1. 2. Removing the main amplifier board assembly (See Fig.8) When disengaging the joint

23、f using a screwdriver, do not damage or break the board. CAUTION: Bottom cover Fig. 6 Fig. 7 Fig. 8 Main board assembly Joint d Joint e Joint f D D DD ERear panel CN101 F F 1-7 KD-LH7R Prior to performing the following procedure, remove the top cover. Disconnect the wire from connector CN601 on the

24、MP3 board. Remove the five screws G and the MP3 board, releasing the joint g and h. 1. 2. Removing the MP3 board (See Fig.9) Prior to performing the following procedure, remove the front chassis, the heat sink, bottom cover and the main amplifier board assembly. Remove the three screws H attaching t

25、he cassette mechanism assembly from the top cover. 1. Removing the CD mechanism assembly (See Fig.10) Fig.9 G gh CN601 G CD mechanism assembly H H Top cover Fig. 10 H 1-8 KD-LH7R Removing the (LCD Digital: 0) RF signal Flow of functional operation until TOC read When the pickup correctly moves to th

26、e inner area of the disc TERMINAL Microprocessor commands FMO TC94A14FA 40 FEED MOTOR +TERMINAL IC681 4 REST SW When the disc correctly rotates Tracking Servo Loop ON Servo CLV Rough Servo AccelerationAccelerationAcceleration Microprocessor commands Spindle motor (-) IC681 7 0.5 Sec 0.5 Sec FEO 1 TA

27、2157FN 15 TC94A14FA38 CN60110 3.3V TN94A14FA 41 3.3V 1-22 KD-LH7R Feed Section Focus Section Tracking Section Spindle Section Is the voltage output at IC621 pin 40 5V or 0V? Check the feed motor. Is 4V present at both sides of the feed motor? Is the wiring for IC621 (56) (64) correct? Check IC681. I

28、s 6V or 3V present at IC681 4 and 5? Is 3.3V present at IC681 pin 20? Check the feed motor connection wiring. Check the vicinity of IC621. Check CD 8V and 5V. YES YES YES NONO NO NO NO YES YES When the lens is moving: Check the circuits in the vicinity of IC681 pins 8,9 and 15. Check the pickup and

29、its connections. NO YES YES YES Does the S-search waveform appear at IC681 pins 10 and 11? Is the disk rotated? Does the RF signal appear at TP1? Is 4V present at IC681 pins 7 and 6 ? Check the spindle motor and its wiring. Is 4V present at IC621 pin 41 ? Check the vicinity of IC681. Check IC621 and

30、 IC601. YES NO NO NO NONO YES YES YES Check the circuits in the vicinity of IC601 1924 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 IC601 pins 2 12. Check IC621. Check the pickup and its con

31、nections. YESYES YES Is the tracking error signal output at IC601 11? Approx. 1.2 V 4V 1-23 KD-LH7R Maintenance of laser pickup (1) Cleaning the pick up lens Before you replace the pick up, please try to clean the lens with a alcohol soaked cotton swab. (2) Life of the laser diode When the life of t

32、he laser diode has expired, the following symptoms will appear. The level of RF output (EFM output:ampli tude of eye pattern) will be low. Replacement of laser pickup Is RF output 1.0 0.35Vp-p? Replace it. NO YES O.K (3) Semi-fixed resistor on the APC PC board The semi-fixed resistor on the APC prin

33、ted circuit board which is attached to the pickup is used to adjust the laser power.Since this adjustment should be performed to match the characteristics of the whole optical block, do not touch the semi-fixed resistor. If the laser power is lower than the specified value,the laser diode is almost

34、worn out, and the laser pickup should be replaced. If the semi-fixed resistor is adjusted while the pickup is functioning normally,the laser pickup may be damaged due to excessive current. Turn off the power switch and,disconnect the power cord from the ac outlet. Replace the pickup with a normal on

35、e.(Refer to Pickup Removal on the previous page) Plug the power cord in,and turn the power on. At this time,check that the laser emits for about 3seconds and the objective lens moves up and down. Note: Do not observe the laser beam directly. Play a disc. Check the eye-pattern at TP1. Finish. 1-24 KD

36、-LH7R A0 A1 A2 GND 1 2 3 4 Vcc WP SCL SDA 8 7 6 5 1kbit EEPROM ARRAY 7bit ADDRESS DECODER SLAVE/WORD ADDRESS REGISTER 7bit 8bit DATA REGISTER CONTROL LOGIC HIGH VOLTAGE GEN.Vcc LEVEL DETECT ACK STARTSTOP BR24C01AFV-W-X (IC502) : EEPROM 1.Pin layout 2.Block diagram 3.Pin function A0A1A2GND VccWPSCLSD

37、A Pin nameI/OFunction Vcc GND A0,A1,A2 SCL SDA WP - - IN IN IN / OUT IN *1 An open drain output requires a pull-up resister. Power supply Ground (0v) Slave address set Serial clock input Slave and word address, serial data input, serial data output *1 Write protect input Description of major ICs 1-2

38、5 KD-LH7R VddWPINSCLSDA A0A1A2GND 8 Vdd 7 WPIN 6 SCL 5 SDA A0 1 A1 2 A2 3 GND 4 16kbit EEPROM allay 11bit 11bit 8bit Address decoder Slave Word Address resister Data resister START STOP ACK Control circuit High voltage osc circuit Power supply voltage det. Vdd GND A0,A1,A2 SCL SDA WPIN - - I I I/O I

39、 Power supply. GND No use connect to GND. Serial clock input. Serial data I/O of slave and word address. Write protect terminal. Symbol I/O Function BR24C32F-X (IC771) : EEPROM 1. Pin layout 3. Block diagram 2. Pin function 1-26 KD-LH7R 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

40、25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 SW2 SW3 SW4 REST LM0 LM1 NC NC VDD X2 X1 VSS XT2 XT1 RESET SW1 BUS-INT PS2 CRUISE RDS-SCK RDS DA REMOCON AVDD AVREF0 VOL1 VOL2 KEY0 KEY1 KEY2 LEVEL SQ SM AVSS NC NC AVREF BUS-SI BUS-SO BUS-SCK BUS-I/O LCD-DA LCD-SCK LCD-CE

41、 BUZZER E2PROM-DI E2PROM-DO E2PROM-CLK OPEN NC NC Signal input of mechanism switch 2 detection Signal input of mechanism switch 3 detection Signal input of mechanism switch 4 detection Rest switch detection signal input Loading side motor control signal output Eject side motor control signal output

42、Non connect Non connect 5V connection GND connection Reset detection terminal Mechanism switch detection signal input J-BUS signal interrupt input POWER SAVE2. BACK UP and synchronization Becomes stop mode because of the input of H. Pulse signal input for cruise RDS clock input RDS data input Remote

43、 control signal input 5V connection 5V connection Rotation volumepulse signal input Pulse which actually becomes judgment of change Rotation volume pulse signal input Key input 0 Key input 1 Key input 2 Level meter input S.QUALITY level input S.METER level input GND connection Non connect Non connec

44、t 5V connection J-BUS data input J-BUS data output J-BUS clock input & output J-BUS I/O switch output. At output : H, At input : L Data output to LCD driver Clock output to LCD driver Chipenable to LCD driver Buzzer output Communication data input of 12C Communication data output of 12C Communicatio

45、n data clock output 12C Opening detection input Non connect Non connect I I I I O O O O I I I I I I I I I I I I I I I I O O I O I/O O O O O OI O O I O O O UPD784216AGC163(1/2) Pin No.SymbolI/OFunction UPD784216AGC163 (IC701): SYSTEM CPU 1-27 KD-LH7R 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67

46、 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 NC NC SD/ST NC MONO NC NC NC NC NC DETACH AFCK SEEK/STP NC FM/AM PLL-CE PLL-DO PLL-CLK PLL-DI TEL-MUTE NC VSS DIM-IN PS1 POWER CD-ON MUTE NC NC NC VDD NC VOL-DA VOL-CLK DIM-OUT NC NC NC NC STAGE BUCK

47、 CCE RST TEST BUS0 BUS1 BUS2 BUS3 DISCSEL J/E Non connect Non connect Station detector and stereo signal input. It is H and there is a bureau.It is L and a stereo. Non connect Monaural ON/OFF switch output. At the time of the MONO ON :H. Non connect Non connect Non connect Non connect Non connect De

48、tach signal input. It is L of 200ms or more and an operation mode. H:POWER SAVE AF check output. AF check:L Auto seek stop switch output. At SEEK:H. At STOP:L Non connect FM,AM switch output CE output for IC control for PLL Data output for IC control for PLL Clock output for IC control PLL Data outp

49、ut for IC control for PLL Telephone mute detection input. It is L or H and MUTE(ACTIVE depends on the PSM setting) Non connect (ex:AMP-KILL output) GND connection Dimmer detection input. At L:dimmer ON. POWER SAVE 1. ACC and synchronization POWER SAVE : L. At operation:H POWER ON/OFF switch output. At POWER ON:H The CD power supply control si