Jvc-KDS-821-R-Service-Manual(1) 电路图 维修手册.pdf

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1、SERVICE MANUAL CD RECEIVER No.49679 Feb. 2002 COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD. KD-S821R KD-S821R Area Suffix 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 laser pick

2、up Replacement of laser pickup Description of major ICs 2-1 2-3 2-3 2-6 E - Continental Europe EX - Central Europe 45Wx4KD-S821R 789101112RDS MO RND DISP TPPTYSCM COMPACT DIGITAL AUDIO RadioFans.CN 收音机爱 好者资料库 1-2 KD-S821R ! Burrs formed during molding may be left over on some parts of the chassis. T

3、herefore, 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-S821R Front bracket CD mechanism control board Dam

4、per 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), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser diode

5、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 in the work area can destroy the optical pickup (laser diode) in devices such as CD players. Be careful to us

6、e 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 over it before placing the traverse unit (optical pickup) on it. 2-2 Ground yourself Use an anti-static wrist st

7、rap 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 diode on the replacement optical pickup are shorted. After replacement, return the shorted parts to their orig

8、inal 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. 4.Handling the traverse unit (optical pickup) 1. Do not subject the traverse unit (optical pickup) to str

9、ong 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 replacement procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not

10、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 resistor that adjusts the laser power. Do not turn it Conductive material (conductive sheet) or iron plate

11、 (caption) Anti-static wrist strap 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 destroy.) 2.Please remo

12、ve 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. RadioFans.CN 收音机爱 好者资料库 1-4 KD-S821R Press the eject button in the lower right part of the front panel. Remove the

13、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 joint tabs a on both sides of the front chassis assembly and remove the front chassis assembly toward the front. 1. Remo

14、ving 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 Heat sinkTab a Tab a 1-5 KD-S821R Remove the three screws A on the left side of the body. 1. Removing the heat sink (See

15、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 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

16、 Heat sink A Joints b Joints b Joint b Joints b Joints b Joint b Bottom cover Bottom cover Rear panel Rear panel A 1-6 KD-S821R 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 sc

17、rews 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 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 an

18、d 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. Remove the three screws F attaching the CD mechanism section on the back of the top chassis. 1. Removing the CD mechanism section (See Fi

19、g.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 1-7 KD-S821R 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

20、twelve 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 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 Join

21、ts c Joints c 1-8 KD-S821R Unsolder the part a and b on the CD mechanism control board. Remove the 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

22、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. 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

23、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 disconnected easily. (Refer to Fig.2) ATTENTION: Prior to performing the following procedure, remove the CD mechanism control board. Remove the two springs f atta

24、ching the CD mechanism assembly and the front bracket. Remove the two screws B and the front bracket 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 uni

25、t 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 Fig.1 Front bracket CD mechanism control board Damper bracket h c d b a DD D CD mechanism assembly A e h 1-9 KD-S821R Prior to performing the following pro

26、cedure, remove the CD mechanism control board and the front bracket (loading motor). Remove the three 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 assem

27、bly and the two springs h attaching the flame. Remove the two screws E and both sides rear damper brackets 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 remo

28、ved 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) 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 p

29、late (L) g g Rear damper bracket Fix arm (L) Damper E Fix plate(R) E g g h 1-10 KD-S821R Prior to performing 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. Removi

30、ng the feed motor assembly (See Fig.10) Prior to performing the following procedure, remove the CD mechanism 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 p

31、ulling 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 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 pa

32、rt i of the FD screw. ATTENTION: Prior to performing the following procedure, remove the CD mechanism 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 a

33、rms. Open the clamper arm upward. Turn the turn table, and remove the two screws H and the spindle motor. 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 pl

34、ate Pickup mount nut Pickup unit FD screw G H H 1-11 KD-S821R Adjustment method Test instruments required 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 met

35、er 8. Test Disc JVC :CTS-1000 9. Extension cable for check EXTGS004-26P 1 Standard measuring conditions Power supply 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

36、 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 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

37、 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 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 Acce

38、lerationAccelerationAcceleration Microprocessor commands Spindle motor (-) IC501 7 0.5 Sec 0.5 Sec 1 FEO 1-13 KD-S821R 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 t

39、he wiring for IC541 (90) (100) correct? Check IC501. Is 6V or 2V present at IC501 10 and 11? Is 5V present at 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 vi

40、cinity of IC501 pins 14 18. Check the pickup and its connections. NO YES YES YES Does the S-search waveform 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

41、 ? Check the vicinity of IC501. Check IC521 and IC541. YES NO NO NO NONO YES YES YES Check the circuits in the 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

42、pins 2 12. Check IC521. Check the pickup and its connections. YESYES YES Is the tracking error signal output at IC521 12? Approx. 1.2 V 4V 1-14 KD-S821R 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

43、 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 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

44、 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

45、lower than the specified value,the laser diode is almost 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 cor

46、d 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 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. P

47、lay a disc. Check the eye-pattern at TP1. Finish. 1-15 KD-S821R 2 1 11 12 10 1513 14 5 4 6 38 9 7 Surge Protector BIASTSD HA13164A (IC961) : Regurator 1.Pin layout 2.Block daiagram 3.Pin function Pin No.SymbolFunction 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 REMOTE ANT ACC.IN VDD5V SW5V ACC5V ANT CTRL ME

48、MORY.IN BATT DET 9V CTRL CD 8V AJ 10V GND Output voltage is VCC-1V.When M or H level applied to CTRL pin. Output voltage is VCC-1V.When M or H level to CTRL pin and H level to ANT-CTRL. Connected to ACC. Regular 5.7V. Output voltage is 5V when M or H level applied to CTRL pin. Output for ACC detecto

49、r. L:ANT output OFF, H:ANT output ON Connected to VCC. Low battery detect. Output voltage is 9V When M or H level applie 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 when M or H level applied to CTRL pin. Connected to GND. 123456789 10 11 12 13 14 15 REMOTE ANT ACC.IN VDD5V SW5V ACC5V ANT CTRL MEMORY