Jvc-KDS-621-Service-Manual(1) 电路图 维修手册.pdf

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1、SERVICE MANUAL CD RECEIVER No.49675 Jan. 2002 COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD. KD-S621 KD-S621 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 pickup Replacement

2、 of laser pickup Description of major ICs 1-12 1-14 1-14 1-15 26 Area Suffix E - Continental Europe EX - Central Europe SEL LOUD DISP SSM 4 CD FM AM SCMMODE 789101112RNDRPTMO RadioFans.CN 收音机爱 好者资料库 KD-S621 1-3 Front bracket CD mechanism control board Damper bracket CD mechanism assy FD screw Feed m

3、otor assy FD gear Pickup 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 in the traverse unit (optical pickup). Take

4、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 use proper grounding in the area where repairs

5、 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 strap to release any static electricity built

6、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 original condition. (Refer to the text.) 2. Do n

7、ot 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 strong shocks, as it is a sensitive, complex un

8、it. 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 to take too long a time when attaching it to

9、 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 (caption) Anti-static wrist strap Soldering

10、 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 remove solder after connecting the card wire wit

11、h 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 KD-S621 1-4 Press the eject button in the lower right part of the front panel. Remove the front panel assembly from the body. 1. Removi

12、ng 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. Removing the front chassis assembly (See Fig.2 an

13、d 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 RadioFans.CN 收音机爱 好者资料库 KD-S621 1-5 Remove the three screws A on the left side of the body. 1. Removing the heat sink (See Fig.4) Prior to perfor

14、ming 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 Heat sink AA Joints b

15、 Joints b Joint b Joints b Joints b Joint b Bottom cover Bottom cover Rear panel Rear panel KD-S621 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 sc

16、rews 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 and 8) Prior to performin

17、g 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 cassette mechanism section on the back of the top chassis. 1. Removing the CD mechanism section (See Fig.9) Fig.7 Fig.8

18、Fig.9 Rear panel B D D D C Main board E E CN501 CD mechanism section F F F Top chassis CC KD-S621 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 nine joints c wit

19、h 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 Joints c Joints c Front panel Rear cover Front panel Control switch board Joints c Joints c KD-S6

20、21 1-8 Unsolder the part f and g 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 F attaching the CD mechanism control board. Remove the CD mechanism control bo

21、ard in the direction of the arrow while releasing it from the two damper bracket slots i and the front bracket slot j. Disconnect the flexible wire from connector on the pickup unit. Removing the CD mechanism control board(See Fig.1 and 2) Turn the FD gear in the direction of the arrow to move the e

22、ntire pickup unit to the appropriate position where the flexible wire of the CD mechanism unit can be disconnected easily (Refer to Fig.2). ATTENTION: Fig.1 Fig.2 Fig.3 Fig.4 Front bracket CD mechanism control board Shift the lock Flexible wire Pickup unit FD gear CD mechanism control board Loading

23、motor Front bracket Front bracket Pull outward Pull outward Flame Damper bracket m m h i g f II I CD mechanism assy F j k G k G KD-S621 1-9 Prior to performing the following procedure, remove the CD mechanism control board. Remove the two springs k attaching the CD mechanism assy and the front brack

24、et. Remove the two screws G and the front bracket while pulling the flame outward. Remove the belt and the screw H from the loading motor. Removing the loading motor (See Fig.3 to 5) Prior to performing the following procedure, remove the CD mechanism control PWB and the front bracket (loading motor

25、). Remove the three screws I 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 l as shown in Fig.8 and 9. Remove the CD mechanism assy and the two springs m attaching the flame. Remove the two screws J and both sides

26、rear damper brackets from the dampers. Detach the CD mechanism assy from the left side to the right side. 1. 2. 3. 4. Removing the CD mechanism assy (See Fig.1, 6 to 9) The CD mechanism assy can be removed if only the rear damper bracket on the left side is removed. ATTENTION: Fig.5 Fig.6 Fig.7 Fig.

27、8 Fig.9 Rear damper bracket Fix arm (R) Damper H II Loading motor Belt Damper bracket CD mechanism assy Flame m m I I Fix plate (L) l l Rear damper bracket Fix arm (L) Damper J Fix plate(R) J l l KD-S621 1-10 Prior to performing the following procedure, remove the CD mechanism control board, the fro

28、nt bracket (loading motor) and the CD mechanism assy. Remove the two screws K and the feed motor assy.1. Removing the feed motor assy (See Fig.10) *Prior to performing the following procedure, remove the CD mechanism control board, the front bracket (loading motor), the CD mechanism assy and the fee

29、d motor assy. Detach the FD gear part of the pickup unit upward. Then remove the pickup unit while pulling out the part n of the FD screw. 1. Remove the screw L 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

30、Fig.10 and 11) When reattaching the pickuap unit, reattach the part o of the pickup unit, then the part n 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 assy and the feed motor assy.

31、Turn up the CD mechanism assy and remove the two springs p on both sides of the clamper arms. Open the clamper arm upward. Turn the turn table, and remove the two screws M 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 pp Pickup

32、unit Part n FD screw Feed motor assy FD gearPickup unit Part O K Nut push spring plate Pickup mount nut Pickup unit FD screw L M M KD-S621 1-11 Adjustment method Test instruments required for adjustment 1. Digital oscilloscope (100MHz) 2. AM Standard signal generator 3. FM Standard signal generator

33、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 voltage DC14.4V(10.516V) Load impedance 4 (2 Speakers connection) Line out load impedance 20k Output

34、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 between SSG output and antenna input.The loss of 6dB need not be considered since direct reading of figures are appli

35、ed 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 Microprocessor commands FMO TC9462 53 FEED MOTOR +TERMINAL IC581 5 REST SW When the disc cor

36、rectly rotates Tracking Servo Loop ON Servo CLV Rough Servo AccelerationAccelerationAcceleration Microprocessor commands Spindle motor (-) IC581 7 0.5 Sec 0.5 Sec KD-S621 1-13 Feed Section Focus Section Tracking Section Spindle Section Is the voltage output at IC521 pin 53 5V or 0V? Check the feed m

37、otor. 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 wiring. Check the vicinity of IC521. Check CD 9V and 5V. YES YES YES NONO NO NO NO YES YE

38、S 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? Does the RF signal appear at TP1? Is 4V present at IC581 pins 7 and 8 ? Check the sp

39、indle 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 waveform at TP1 distorted? Proceed to the Tracking section When the disc is rotated

40、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 KD-S621 1-14 Maintenance of laser pickup (1) Cleaning the pick up lens Before you replace the pick up, pleas

41、e 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 tude of eye pattern) will be low. Replacement of laser pickup Is RF output 1.0 0.35Vp-

42、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 t

43、ouch 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 is adjusted while the pickup is functioning normally,the laser pickup may be damaged due to excessive current. Tu

44、rn 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 turn the power on. At this time,check that the laser emits for about 3seconds and the objective lens moves up and d

45、own. Note: Do not observe the laser beam directly. Play a disc. Check the eye-pattern at TP1. Finish. KD-S621 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 0.1u AUDIO OUT CD OUT CTRL ANT CTRL EXT OUT ANT OUT VCCACC Surge Protector BIASTSD C1 100u C2 0.1u +B ACC BATT.DET

46、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 HA13164A(IC901) : Regulator 1.Pin layout 2.Block diagram 3.Pin function Pin No.SymbolFunction 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 EXT ANT ACC VDD SW5V ACC5V ANT CTRL MEMORY BATT DET 9V CTRL C

47、D8V AJ ILMI 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 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:

48、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 when M or H level applies to CTRL pin. Co

49、nnected to GND. 123456789 10 11 12 13 14 15 MEMORY Description of major ICs KD-S621 1-16 1.Pin layout 2.Block diagram AN8806SB-W (IC501) : RF & Servo amp. PD 1 LD 2 LDON 3 LDP 4 VCC 5 RF- 6 RF OUT 7 RF IN 8 C.AGC 9 ARF 10 C.ENV 11 C.EA 12 CS BDO 13 BDO 14 CS BRT 15 OFTR 16 /NRFDET 17 GND 18 36 PDAC 35 PDBD 34 PDF 33 PDE 32 PDER 31 PDFR 30 TBAL 29 FBAL 28 EF- 2