Jvc-KDS-871-R-Service-Manual(1) 电路图 维修手册.pdf

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1、SERVICE MANUAL CD RECEIVER No.49691 Feb. 2002 COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD. KD-S871R KD-S871R Contents Safety precaution Preventing static electricity Important for laser products Disassembly method Adjustment method 1-2 1-3 1-4 1-5 1-12 Flow of functional operation unit TOC read Main

2、tenance of laser pickup Replacement of laser pickup Description of major ICs 1-13 1-15 1-15 1-16 - - - - - - - - - COMPACT DIGITAL AUDIO 4 SCMMODE RNDRPTMO AM FM TP/PTY SELCD DISP 879101112 Area Suffix E Continental Europe EX-Central Europe RadioFans.CN 收音机爱 好者资料库 1-2 KD-S871R ! Burrs formed during

3、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 好者资料库 1

4、-3 KD-S871R Conductive material (conductive sheet) or iron plate (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 (optic

5、al pickup). Take care to prevent this when performing repairs. 1.2. 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 repla

6、cing the optical pickup. For specific details, refer to the replacement 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

7、 to strong force. 4. It is not possible to adjust the semi-fixed 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 shor

8、ted. After replacement, return the shorted parts to their original 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-stati

9、c wrist strap to release any static electricity built up in your 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

10、static electricity Static electricity in the work area can destroy 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. FD screw Feed motor assy FD gear Pickup unit Shorting Short circuit land RadioFans.CN

11、收音机爱 好者资料库 1-4 KD-S871R 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 t

12、he 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 sw

13、itches. 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 urko

14、pplad. 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 sikkerhe

15、tsbryteren 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 laser- strlning r denna del r ppnad och sprren r urkopplad. Betrakta ej st

16、rlen. (s) VARO : Avattaessa 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 n

17、ot to see the beam directly or touch it in case of an adjustment or operation check. 1-5 KD-S871R Press the eject button in the lower right part of the front panel. Remove the front panel assembly from the body. 1. Removing the front panel assembly (See Fig.1) Prior to performing the following proce

18、dure, remove the front panel assembly. Release the four joint tabs a on both sides of the front chassis assembly and remove the front chassis assembly toward the front. 1. Removing the front chassis assembly (See Fig.2 and 3) Disassembly method Fig.1 Fig.2 Fig.3 Front panel assembly Eject button Tab

19、 a Tab a Front chassis assembly Front chassis assembly Heat sinkTab a Tab a 1-6 KD-S871R Remove the three screws A on the left side of the body. 1. Removing the heat sink (See Fig.4) Prior to performing the following procedure, remove the front panel assembly, the front chassis assembly and the heat

20、 sink. Turn over the body and unjoint the five joints b with the bottom cover and the body using a screwdriver. 1. Removing the bottom cover (See Fig.5 and 6) Fig.4 Fig.5 Fig.6 Heat sink A Joints b Joints b Joint b Joints b Joints b Joint b Bottom cover Bottom cover Rear panel Rear panel A 1-7 KD-S8

21、71R Prior to performing the following procedure, remove the front panel assembly, the front chassis assembly, the heat sink and the bottom cover. Remove the screw B, the two screws C and the three screws D attaching the rear bracket on the back of the body. Remove the rear panel. Remove the two scre

22、ws E attaching the main board on the bottom of the body. Disconnect connector CN501 on the main board in the direction of the arrow. 1. 2. Removing the main board (See Fig.7 and 8) Prior to performing the following procedure, remove the front panel assembly, the front chassis assembly, the heat sink

23、, the bottom cover and the main board. Remove the three screws F attaching the CD mechanism section on the back of the top chassis. 1. Removing the CD mechanism section (See Fig.9) Fig.7 Fig.8 Fig.9 Rear panel B D D D C Main board E E CN501 CD mechanism section F F F Top chassis C 1-8 KD-S871R Prior

24、 to performing the following procedure, remove the front panel assembly. Remove the four screws G attaching the rear cover on the back of the front panel assembly. Unjoint the eleven joints c with the front panel and the rear cover. Remove the control switch board on the back of the front panel. 1.

25、2. 3. Removing the control switch board (See Fig.10 to 12) Fig.10 Fig.11 Fig.12 G GG G Rear cover Front panel Control switch board Joints c Joints c Front panel Rear cover Joints c Joints c 1-9 KD-S871R Unsolder the part a and b on the CD mechanism control board. Remove the stator fixing the CD mech

26、anism control board and the damper bracket (To remove the stator smoothly, pick up the center part). Remove the screw A attaching the CD mechanism control board. Remove the CD mechanism control board in the direction of the arrow while releasing it from the two damper bracket slots d and the front b

27、racket slot e. Disconnect the flexible wire from connector on the pickup unit. 1. 2. 3. 4. 5. Removing the CD mechanism control board (See Fig.1 and 2) Turn the FD gear in the direction of the arrow to move the entire pickup unit to the appropriate position where the flexible wire of the CD mechanis

28、m unit can be disconnected easily. (Refer to Fig.2) ATTENTION: Prior to performing the following procedure, remove the CD mechanism control board. Remove the two springs f attaching the CD mechanism assembly and the front bracket. Remove the two screws B and the front bracket while pulling the flame

29、 outward. Remove the belt and the screw C from the loading motor. 1. 2. 3. Removing the loading motor (See Fig.3 to 5) Fig.2 Fig.3 Fig.4 Shift the lock Flexible wire Pickup unit FD gear CD mechanism control board Loading motorFront bracket Front bracket Pull outward Pull outward Flame f B f B Fig.5

30、C Loading motor Belt Fig.1 Front bracket CD mechanism control board Damper bracket h c d b a DD D CD mechanism assembly A e h 1-10 KD-S871R Prior to performing the following procedure, remove the CD mechanism control board and the front bracket (loading motor). Remove the three screws D and the damp

31、er bracket. Raise the both sides fix arms and move the fix plates in the direction of the arrow to place the four shafts g as shown in Fig.8 and 9. Remove the CD mechanism assembly and the two springs h attaching the flame. Remove the two screws E and both sides rear damper brackets from the dampers

32、. Detach the CD mechanism assembly from the left side to the right side. 1. 2. 3. 4. Removing the CD mechanism assembly (See Fig.1, 6 to 9) The CD mechanism assembly can be removed if only the rear damper bracket on the left side is removed. ATTENTION: Fig.6 Fig.7 Fig.8 Fig.9 Rear damper bracket Fix

33、 arm (R) Damper DD Damper bracket CD mechanism assembly Flameh h D D Fig.5 Front bracket CD mechanism control board Damper bracket h c d b a DD D CD mechanism assembly A e Fix plate (L) g g Rear damper bracket Fix arm (L) Damper E Fix plate(R) E g g h 1-11 KD-S871R Prior to performing the following

34、procedure, remove the CD mechanism control board, the front bracket (loading motor) and the CD mechanism assembly. Remove the two screws F and the feed motor assembly. 1. Removing the feed motor assembly (See Fig.10) Prior to performing the following procedure, remove the CD mechanism control board,

35、 the front bracket (loading motor), the CD mechanism assembly and the feed motor assembly. Detach the FD gear part of the pickup unit upward. Then remove the pickup unit while pulling out the part i of the FD screw. 1. Remove the screw G attaching the nut push spring plate and the pickup mount nut f

36、rom the pickup unit. Pull out the FD screw. 2. Removing the pickup unit (See Fig.10 and 11) When reattaching the pickup unit, reattach the part j of the pickup unit, then the part i of the FD screw. ATTENTION: Prior to performing the following procedure, remove the CD mechanism control board, the fr

37、ont bracket (loading motor), the CD mechanism assembly and the feed motor assembly. Turn up the CD mechanism assembly and remove the two springs k on both sides of the clamper arms. Open the clamper arm upward. Turn the turn table, and remove the two screws H and the spindle motor. 1. 2. Removing th

38、e spindle motor (See Fig.12 and 13) Fig.10 Fig.11 Fig.12 Fig.13 Spindle motor k k Pickup unit Part i FD screw Feed motor assembly FD gear Pickup unit Part j F Nut push spring plate Pickup mount nut Pickup unit FD screw G H H 1-12 KD-S871R Adjustment method Test instruments required for adjustment 1.

39、 Digital oscilloscope (100MHz) 2. AM Standard signal generator 3. FM Standard signal generator 4. Stereo modulator 5. Electric voltmeter 6. Digital tester 7. Tracking offset meter 8. Test Disc JVC :CTS-1000 9. Extension cable for check EXTGS004-26P 1 Standard measuring conditions Power supply voltag

40、e DC14.4V(11V to 16V allowance) Load impedance 4 (4 to 8 allowance) Output Level Line out 2.0V / 20 k (full scale) How to connect the extension cable for adjusting Dummy load Exclusive dummy load should be used for AM,and FM. For FM dummy load,there is a loss of 6dB between SSG output and antenna in

41、put.The loss of 6dB need not be considered since direct reading of figures are applied in this working standard. Standard volume position Balance and Bass Digital: 0) RF signal Flow of functional operation until TOC read When the pickup correctly moves to the inner area of the disc TERMINAL Micropro

42、cessor commands FMO TC9462 53 FEED MOTOR +TERMINAL IC581 5 REST SW When the disc correctly rotates Tracking Servo Loop ON Servo CLV Rough Servo AccelerationAccelerationAcceleration Microprocessor commands Spindle motor (-) IC581 7 0.5 Sec 0.5 Sec 1-14 KD-S871R Feed Section Focus Section Tracking Sec

43、tion Spindle Section Is the voltage output at IC521 pin 53 5V or 0V? Check the feed motor. Is 4V present at both sides of the feed motor? Is the wiring for IC521 (90) (100) correct? Check IC581. Is 6V or 2V present at IC581 5 and 6? Is 5V present at IC581 pin 11? Check the feed motor connection wiri

44、ng. Check the vicinity of IC521. Check CD 9V and 5V. YES YES YES NONO NO NO NO YES YES When the lens is moving: Check the circuits in the vicinity of IC581 pins 15 18. Check the pickup and its connections. NO YES YES YES Does the S-search waveform appear at IC581 pins 17 and 18? Is the disk rotated?

45、 Does the RF signal appear at TP1? Is 4V present at IC581 pins 7 and 8 ? Check the spindle motor and its wiring. Is 4V present at IC521 pin 55 ? 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 19 24 or the pickup Is the RF

46、 waveform at TP1 distorted? Proceed to the Tracking section When the disc is rotated at first: Check the circuit in the vicinity of IC501 pins 2 12. Check IC521. Check the pickup and its connections. YESYES YES Is the tracking error signal output at IC501 12? Approx. 1.2 V 4V 1-15 KD-S871R Maintenan

47、ce 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 the laser diode has expired, the following symptoms will appear. (1) The level of RF output (EFM output:ampli

48、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 printed 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 worn out, and the laser pickup shou