Jvc-KDS-687-Service-Manual(1) 电路图 维修手册.pdf

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1、SERVICE MANUAL CD RECEIVER No.49737 Apr. 2002 COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD. KD-S687 KD-S687 Area Suffix UR - Brazil Contents Safety precaution Preventing static electricity Disassembly method Adjustment method 1-2 1-3 1-4 1-11 Flow of functional operation unit TOC read Maintenance of

2、laser pickup Replacement of laser pickup Description of major ICs 1-12 1-14 1-14 1-15 26 RadioFans.CN 收音机爱 好者资料库 KD-S687 1-2 ! Burrs formed 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 pre

3、caution ! 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 KD-S687 1-3 Front bracket CD mechanism control board Damper bracket CD mechanism assy FD screw Feed motor assy FD gear Pickup unit Preventing static elect

4、ricity 1.Grounding to prevent damage by 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. 2.About

5、 the earth processing for the destruction prevention by static electricity Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as CD players. Be careful to use proper grounding in the area where repairs are being performed. 2-1 Ground the workbench Ground

6、 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. 2-2 Ground yourself Use an anti-static wrist strap to release any static electricity built up in your body. 3. Handling the optical pickup 1. In

7、 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 original condition. (Refer to the text.) 2. Do not use a tester to check the condition of the laser d

8、iode in the optical pickup. The testers internal power source can easily destroy the laser diode. 4.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

9、 using nippers, etc. after replacing 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 carefull

10、y as it may break when subjected to strong force. 4. It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it Conductive material (conductive sheet) or iron plate (caption) Anti-static wrist strap Soldering Attention when traverse unit is decomposed 1.Solder

11、is put up before the card wire is removed from connector on the CD substrate as shown in Figure. (When the wire is removed without putting up solder, the CD pick-up assembly might destroy.) 2.Please remove solder after connecting the card wire with when you install picking up in the substrate. *Plea

12、se refer to Disassembly method in the text for pick-up and how to detach the substrate. RadioFans.CN 收音机爱 好者资料库 KD-S687 1-4 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 perf

13、orming the following procedure, 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

14、 assembly Eject button Tab a Tab a Front chassis assembly Front chassis assembly Heat sinkTab a Tab a KD-S687 1-5 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 chas

15、sis assembly and the heat 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 AA Joints b Joints b Joint b Joints b Joints b Joint b Bottom cover Bottom cover Rear pa

16、nel Rear panel KD-S687 1-6 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 four screws C and the three screws D attaching the rear bracket on the back of the body. Remove the rear pa

17、nel. Remove the two screws 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

18、 assembly, the heat sink, the bottom cover and the main board. Remove the three screws F attaching the cassette 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 Top

19、chassis CC F KD-S687 1-7 Prior 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 ten joints c with the front panel and the rear cover. Remove the control switch board on the b

20、ack of the front panel. 1. 2. 3. Removing the control switch board (See Fig.10 to 12) Fig.10 Fig.11 Fig.12 G GG G Rear cover Joints c Front panel Rear cover Front panel Control switch board Joints c Joints c Joints c KD-S687 1-8 Unsolder the part a and b on the CD mechanism control board. Remove the

21、 stator fixing the CD mechanism 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 brack

22、et slots d and the front bracket 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 flexib

23、le wire of the CD mechanism 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 brack

24、et while pulling the flame 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 ou

25、tward Flame f B f B Fig.5 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 KD-S687 1-9 Prior to performing the following procedure, remove the CD mechanism control board and the front bracket (loading motor). Remove the thr

26、ee screws D and the damper 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 b

27、rackets from the dampers. 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

28、 Rear damper bracket Fix 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 KD-S687 1-10 Prior to pe

29、rforming the following 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 m

30、echanism control board, 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

31、 the pickup mount nut from 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 mechanis

32、m control board, the front 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 m

33、otor. 1. 2. Removing the 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 KD-S687 1-11 Adjustment method Test instruments requ

34、ired for adjustment 1. 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 conditio

35、ns Power supply voltage DC14.4V(10.516V) Load impedance 4 (2 Speakers connection) Line oout impeadance 20k Output Level Line out 2.0V (Vol. MAX) 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 bet

36、ween SSG output and antenna input.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

37、 of the disc TERMINAL Microprocessor 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 KD-S687 1-13 Feed Secti

38、on Focus Section Tracking Section 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 t

39、he feed motor connection wiring. 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

40、 and 18? Is the disk rotated? 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

41、19 24 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 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

42、 V 4V KD-S687 1-14 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 the laser diode has expired, the following symptoms will appear. (1) The level of

43、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 printed circuit board which is attached to the pickup is used to adjust the laser

44、 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 should be replaced. If the semi-fixed resistor

45、 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 one.(Refer to Pickup Removal on the previous page) Plug the power cord in,and t

46、urn 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. KD-S687 1-15 2 1 11 12 10 1513 14 5 4 6 38 9 7 ILM AJGND C6 10u C5 0.1u C4 0.1u C3 0

47、.1u AUDIO OUT CD OUT CTRL ANT CTRL EXT OUT ANT OUT VCCACC Surge Protector BIASTSD C1 100u C2 0.1u +B ACC BATT.DET OUT COMPOUT VDD OUT SW5VOUT ILMOUT C7 0.1u C8 0.1u R1 UNIT R: C:F note1) TAB (header of IC) connected to GND HA13164 (IC901) : Regulator 1.Terminal layout 2.Block diagram 3.Pin function

48、Pin No.SymbolFunction 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 EXTOUT ANTOUT ACCIN VDDOUT SW5VOUT COMPOUT ANT CTRL VCC BATT DET AUDIO OUT CTRL CD OUT ILM AJ ILM OUT GND Output voltage is VCC-1 V when M or H level applied to CTRL pin. Output voltage is VCC-1 V when M or H level to CTRL pin and H level to

49、ANT-CTRL. Connected to ACC. Regular 5.7V. Output voltage is 5V when M or H level applies to CTRL pin. Output for ACC detector. L:ANT output OFF , H:ANT output ON Connected to VCC. Low battery detect. Output voltage is 9V when M or H level applied to CTRL pin. L:BIAS OFF, M:BIAS ON, H:CD ON Output voltage is 8V when H level applied to CTRL pin. Adjustment pin for ILM output voltage. Output voltage is 10V wh