Jvc-KDS-6250-Service-Manual(1) 电路图 维修手册.pdf

《Jvc-KDS-6250-Service-Manual(1) 电路图 维修手册.pdf》由会员分享，可在线阅读，更多相关《Jvc-KDS-6250-Service-Manual(1) 电路图 维修手册.pdf（37页珍藏版）》请在收音机爱好者资料库上搜索。

1、SERVICE MANUAL CD RECEIVER No.49666 Dec. 2001 COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD. KD-S6250 / KD-S580 KD-S6250/KD-S580 Area Suffix J - Northern America KD-S6250 KD-S580 31 FM CD AM SSM KD-S6250 DIRECTTRACKACCESS MORPTRND MODESCM FM CD AM SSM KD-S580 DIRECTTRACKACCESS MORPTRND MODESCM Content

2、s 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 of laser pickup Description of major ICs 1-12 1-14 1-14 1-15 Difference point KD-S6250 KD-S580 Color Silver Metal

3、lic gray Remocon RadioFans.CN 收音机爱 好者资料库 KD-S6250/KD-S580 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 assembl

4、y. 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 a Tab a Front chassis assembly Fron

5、t chassis assembly Heat sinkTab a Tab a RadioFans.CN 收音机爱 好者资料库 KD-S6250/KD-S580 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 sin

6、k. 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 panel Rear panel RadioFans.CN 收

7、音机爱 好者资料库 KD-S6250/KD-S580 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 rea

8、r 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 performing the following procedure, remove the front panel assembly, the front cha

9、ssis 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

10、F Top chassis CC KD-S6250/KD-S580 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 eleven(KD-S625)or nine(KD-S580) joints c with the front panel and the rear cover.

11、 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 Joints c Joints c Front panel Rear cover J

12、oints c Joints c (KD-S6250) (KD-S580) KD-S6250/KD-S580 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 mechani

13、sm control board. Remove the CD mechanism control board 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

14、 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 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 Pic

15、kup unit FD gear CD mechanism control board Loading 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-S6250/KD-S580 1-9 Prior to performing the following procedure, remove the CD mechanism control board. Remove the two

16、springs k attaching the CD mechanism assy and the front bracket. 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

17、CD mechanism control PWB and the front bracket (loading motor). 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

18、 attaching the flame. Remove the two screws J and both sides 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 o

19、n the left side is removed. ATTENTION: Fig.5 Fig.6 Fig.7 Fig.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-S6250/KD-S580 1-10 Prior to performing t

20、he following procedure, remove the CD mechanism control board, the front 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

21、, the front bracket (loading motor), the CD mechanism assy and the feed 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

22、 pickup unit. Pull out the FD screw. 2. Removing the pickup unit (See 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 br

23、acket (loading motor), the CD mechanism assy and the feed motor assy. 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 (S

24、ee Fig.12 and 13) Fig.10 Fig.11 Fig.12 Fig.13 Spindle motor pp Pickup 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-S6250/KD-S580 1-11 Adjustment method Test instruments required for adjustment 1. Digital oscillo

25、scope (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 voltage DC14.4V(10.516

26、V) Load impedance 20Kohm(2 Speakers connection) 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 between SSG output and antenna input.The loss of 6dB need not

27、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 Microprocessor commands FMO TC9462 53

28、 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-S6250/KD-S580 1-13 Feed Section Focus Section Tracking Section Spindle Section

29、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 wiring. Check the vicinit

30、y 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? Does the RF signal a

31、ppear 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 waveform at TP1 dist

32、orted? 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 KD-S6250/KD-S580 1-14 Maintenance of laser p

33、ickup (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 tude of eye p

34、attern) 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 pe

35、rformed 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 is adjusted while the pickup is function

36、ing 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 turn the power on. At this time,check that

37、 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-S6250/KD-S580 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 CT

38、RL 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 Pin No.SymbolFunction 1 2 3 4 5

39、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 ANT-CTRL. Connected to ACC. Regu

40、lar 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

41、 to CTRL pin. Adjustment pin for ILM output voltage. Output voltage is 10V when M or H level applies to CTRL pin. Connected to GND. 123456789 10 11 12 13 14 15 Description of major ICs KD-S6250/KD-S580 1-16 1.Pin layout 2.Block diagram AN8806SB-W (IC501) : RF & Servo amp. PD 1 LD 2 LDON 3 LDP 4 VCC

42、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- 27 EF OUT 26 TE- 25 TE OUT 24 CROSS 23 TE BPF 22 VDET 21 LD OFF 20 VREF 19 ENV 302425262322143 33 32 34 31 36 35 13 14 15

43、 16 20 2 21 629728 27891017111219 ENV CURCUITRF DET AGC EQ BDO OFTR - + VCBA VCBA VCBA + - + - - + - + - + - + - + - + - + - + - + - + - + + - + - - +- + VCBA KD-S6250/KD-S580 1-17 35 36 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 3. Pin function PD A

44、C FBAL TBAL PDFR PDER PDF PDE PD BD TE BPF VDET CROSS TE OUT TE- FE OUT FE- /NRFDET GND LD OFF VREF ENV OFTR C.AGC ARF C.ENV C.EA CS BDO BDO CS BRT LD LD ON LDP VCC RF- RF OUT RF IN PD Pin No. SymbolI/O I O I - - I O I I/O O I/O I/O I/O O I/O O O - O O - O I O O I O I I I I/O I/O I I I I Function AP

45、C amp . Input terminal APC amp . Output terminal LD ON/OFF control terminal Connect to GND Power supply RF amp . Reversing input terminal RFamp . Output terminal AGC input terminal AGC loop filter connection terminal ARF output terminal RF detection capacity connection terminal HPF-amp capacity conn

46、ection terminal Capacity connection terminal for RF discernment side envelope detection BDO output terminal Capacity connection terminal for RF discernment side envelope detection OFTR output terminal RFDET output terminal Connect to GND 3TENV output terminal VREF output terminal APC OFF control ter

47、minal VDET output terminal VDET input terminal CROSS output terminal TE amp . Output terminal FE amp . Reversing input terminal FE amp . output terminal FE amp . Reversing input terminal F.BAL control terminal T.BAL control terminal I-V amp conversion resistance adjustment terminal I-V amp conversio

48、n resistance adjustment terminal I-V amp input terminal I-V amp input terminal I-V amp input terminal I-V amp input terminal AN8806SB-W KD-S6250/KD-S580 1-18 11 620 1 4 10 15 25 13 14 16 12 9 8 5 7 2 22 17 19 18 21 23 24 3 - + - + - + - + - + - + - + - +IN 1 IN 2 ST BY Vcc 1/2Vcc 3/4 OUT 1+ OUT 1- P

49、WR GND1 OUT 2+ OUT 2- PWR GND2 R.F IN 3 IN 4 PRE GND ON TIME C Muting & ON Time Control Circuit Protective circuit Protective circuit Mute circuit Ripple Filter Stand by Switch N.C + + 0.22 F 2200 F0.022 F 0.22 F TAB +5V ST ON + + + + 47 F 0.22 F 0.22 F 22 F + Mute 10K + 3.3 F OUT 3+ OUT 3- Low Level Mute ON PWR GND3 OUT 4+ OUT 4- PWR GND4 LA4743K(IC321):Power AMP 1.Block diagram KD-S6250/KD-