Jvc-KDS-731-R-Service-Manual(1) 电路图 维修手册.pdf

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1、SERVICE MANUAL CD RECEIVER No.49676 Feb. 2002 COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD. KD-S733R/KD-S731R KD-S733R/KD-S731R Area Suffix E EX Continental Europe Central Europe COMPACT DIGITAL AUDIO 45Wx4KD-S731R 789101112RDS MO RND DISP TPPTYSCM KD-S731R 45Wx4KD-S733R 789101112RDS MO RND DISP TPPT

2、YSCM KD-S733R Contents Safety precaution Preventing static electricity Disassembly method Adjustment method Flow of functional operation untill TOC read Maintanance of laser pickup Replacement of laser pickup Description of major ICs 1- 2 1- 3 1- 4 1-11 1-12 1-14 1-14 1-1529 RadioFans.CN 收音机爱 好者资料库

3、KD-S733R/KD-S731R 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 precaution ! Please use enough caution not to see the beam directly or touch it in case of an adjustment o

4、r operation check. RadioFans.CN 收音机爱 好者资料库 KD-S733R/KD-S731R 1-3 Front bracket CD mechanism control board Damper bracket CD mechanism assy FD screw Feed motor assy FD gearPickup unit Preventing static electricity 1.Grounding to prevent damage by static electricity Electrostatic discharge (ESD), whic

5、h 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 the earth processing for the destruction prevention by static electricity Static electricity

6、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 the workbench by laying conductive material (such as a conductive sheet) or an iron plate ove

7、r 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 order to maintain quality during transport and before installation, both sides of the laser d

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

9、de. 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 using nippers, etc. after replacing the optical pickup. For specific details, refer to the re

10、placement 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-fix

11、ed resistor that adjusts the laser power. Do not turn it Soldering Attention when traverse unit is decomposed 1.Solder 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 d

12、estroy.) 2.Please remove solder after connecting the card wire with when you install picking up in the substrate. *Please refer to Disassembly method in the text for pick-up and how to detach the substrate. (caption) Anti-static wrist strap Conductive material (conductive sheet) or iron plate RadioF

13、ans.CN 收音机爱 好者资料库 KD-S733R/KD-S731R 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 performing the following procedure, remove the front panel assembly. Release the four jo

14、int 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 a Tab a Front chassis assembly Front chassis assembly Hea

15、t sinkTab a Tab a KD-S733R/KD-S731R 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 chassis assembly and the heat sink. Turn over the body and unjoint the five jo

16、ints 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 panel Rear panel KD-S733R/KD-S731R 1-6 Prior to performing the following pro

17、cedure, 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 screws E attaching the main board on the bott

18、om 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, the bottom cover and the main board. Re

19、move 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 chassis C F KD-S733R/KD-S731R 1-7 Prior to performing the followi

20、ng 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 back of the front panel. 1. 2. 3. Removing the control sw

21、itch 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-S733R/KD-S731R 1-8 Unsolder the part a and b on the CD mechanism control board. Remove the stator fixing the CD mechanism control board

22、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 bracket slot e. Disco

23、nnect 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 mechanism unit can be discon

24、nected 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 outward. Remove the

25、 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 C Loading motor Belt

26、 Fig.1 Front bracket CD mechanism control board Damper bracket h c d b a DD D CD mechanism assembly A e h KD-S733R/KD-S731R 1-9 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 damper bracket.

27、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. Detach the

28、 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 arm (R) Dam

29、per 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-S733R/KD-S731R 1-10 Prior to performing the following pro

30、cedure, 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, th

31、e 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 from

32、 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 front

33、 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 the s

34、pindle 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-S733R/KD-S731R 1-11 Adjustment method Test instruments required for adjustm

35、ent 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 conditions Power supply

36、voltage: DC14.4V(11V to 16V allowance) Load impedance: 4 (4 to 8 allowance) Line-Out Level/Impedance: 2.0V/20k load(full scall) Output Impedance: 1k 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

37、 between 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

38、area of the disc TERMINAL Microprocessor commands FMO TC9462 53 FEED MOTOR +TERMINAL IC501 10 REST SW When the disc correctly rotates Tracking Servo Loop ON Servo CLV Rough Servo AccelerationAccelerationAcceleration Microprocessor commands Spindle motor (-) IC501 7 0.5 Sec 0.5 Sec 1 FEO KD-S733R/KD-

39、S731R 1-13 Feed Section Focus Section Tracking Section Spindle Section Is the voltage output at IC541 pin 53 5V or 0V? Check the feed motor. Is 4V present at both sides of the feed motor? Is the wiring for IC541 (90) (100) correct? Check IC501. Is 6V or 2V present at IC501 10 and 11? Is 5V present a

40、t IC501 pin 20? Check the feed motor connection wiring. Check the vicinity of IC541. 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 IC501 pins 14 18. Check the pickup and its connections. NO YES YES YES Does the S-search waveform

41、appear at IC501 pins 6 and 7? Is the disk rotated? Does the RF signal appear at TP1? Is 4V present at IC501 pins 8 and 9 ? Check the spindle motor and its wiring. Is 4V present at IC541 pin 55 ? Check the vicinity of IC501. Check IC521 and IC541. YES NO NO NO NONO YES YES YES Check the circuits in t

42、he vicinity of IC521 2 7, 1824 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 IC521 pins 2 12. Check IC521. Check the pickup and its connections. YESYES YES Is the tracking error signal output

43、 at IC521 12? Approx. 1.2 V 4V KD-S733R/KD-S731R 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 symp

44、toms will appear. (1) 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 printed circuit board which is attached to the

45、 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 should be r

46、eplaced. 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 one.(Refer to Pickup Removal on the previous

47、 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. KD-S733R/KD-S731R 1-15 Description of major ICs 1

48、 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 SDA GND OUTLR OUTLF TL B2L B1L IVL ILL QSL IDL MUTE ICL IMD IBL IAL SCL VCC OUTRR OUTRF TR B2R B1R IVR ILR QSR IDR Vref ICR CAP IBR IAR CD-CH TAPE TUNER POWER SUPPLY SOURCE SELECTOR VOLUME 1 +20 to -31 dB LOUDNESS

49、LEFT BASS LEFT +15 dB TREBLE LEFT +12 dB BASS RIGHT +15 dB TREBLE RIGHT +12 dB MUTE FUNCTION ZERO CROSS DETECTOR VOLUME 2 0 to 55 dB BALANCE FENDER REAR VOLUME 2 0 to 55 dB BALANCE FENDER FRONT HC BUS REC VOLUME 2 0 to -55dB BALANCE FENDER FRONT VOLUME 2 0 to -55dB BALANCE FENDER REAR VOLUME 1 +20 to -31 dB LOUDNESS RIGHT LOGIC 21 31 2 19 16 15 13 11 22 20 18 17 14 23252426 2728 30 29 1 32 3 4 108976512 1.Pin layou