Jvc-KDS-7250-Service-Manual(1) 电路图 维修手册.pdf

《Jvc-KDS-7250-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-7250-Service-Manual(1) 电路图 维修手册.pdf（36页珍藏版）》请在收音机爱好者资料库上搜索。

1、SERVICE MANUAL CD RECEIVER No.49670 Dec. 2001 COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD. KD-S700GN/KD-S700BU KD-S7250 KD-S700GN/KD-S700BU KD-S7250 Area Suffix J -Northern America Contents Safety precaution Preventing static electricity Disassembly method Adjustment method Flow of functional operat

2、ion unit TOC read 1-2 1-3 1-4 1-11 1-12 Maintenance of laser pickup Replacement of laser pickup Discription of major ICs 1-14 1-14 1-15 RadioFans.CN 收音机爱 好者资料库 1-2 KD-S700GN/KD-S700BU KD-S7250 ! Burrs formed during molding may be left over on some parts of the chassis. Therefore, pay attention to su

3、ch 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-S700GN/KD-S700BU KD-S7250 Front bracket CD mechanism control board Damper brack

4、et 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 in the tr

5、averse 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 use proper

6、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 strap to re

7、lease 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 original cond

8、ition. (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 strong shock

9、s, 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 to take t

10、oo 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 (caption

11、) 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 remove solder

12、 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-S700GN/KD-S700BU KD-S7250 Press the eject button in the lower right part of the front panel.

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

14、nt. 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 Heat sinkTab a Tab a 1-5 KD-S700GN/KD-S700BU KD-S7250 Remove the three screws A on the left side of the body.

15、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 joints b with the bottom cover and the body using a screwdriver. 1. Removing the bottom cover (See

16、 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 1-6 KD-S700GN/KD-S700BU KD-S7250 Prior to performing the following procedure, remove the front panel assembly, the front chassis assembly, the heat sink an

17、d 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 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

18、 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. Remove the three screws F attaching the CD mechanism section on the back of the top ch

19、assis. 1. Removing the CD mechanism section (See Fig.9) Fig.7 Fig.8 Rear panel B D D D C Main board E E CN501 CC CD mechanism section F F Top chassis F Fig.9 1-7 KD-S700GN/KD-S700BU KD-S7250 Prior to performing the following procedure, remove the front panel assembly. Remove the four screws G attach

20、ing the rear cover on the back of the front panel assembly. Unjoint the 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 Joints

21、 c Joints c Front panel Rear cover Front panel Control switch board Joints c Joints c 1-8 KD-S700GN/KD-S700BU KD-S7250 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 t

22、he 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. Disconnect the flexible wire from connector on the pickup unit. 1. 2.

23、 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 disconnected easily. (Refer to Fig.2) ATTENTION: Prior to performing t

24、he 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 belt and the screw C from the loading motor. 1. 2. 3. Removing

25、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 Fig.1 Front bracket CD mechanism control board Damper bracket h

26、 c d b a DD D CD mechanism assembly A e h 1-9 KD-S700GN/KD-S700BU KD-S7250 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. Raise the both sides fix arms and move the fix plates

27、 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 CD mechanism assembly from the left side to the righ

28、t 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) Damper DD Damper bracket CD mechanism assembly Flameh h

29、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 1-10 KD-S700GN/KD-S700BU KD-S7250 Prior to performing the following procedure, remove the CD mechanism control bo

30、ard, 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, the front bracket (loading motor), the CD me

31、chanism 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 the pickup unit. Pull out the FD screw. 2

32、. 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 bracket (loading motor), the CD mechanism

33、 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 spindle motor (See Fig.12 and 13) Fig.10 Fi

34、g.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 1-11 KD-S700GN/KD-S700BU KD-S7250 Adjustment method Test instruments required for adjustment 1. Digital oscilloscope (10

35、0MHz) 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(11V16V allowan

36、ce) Load impedance: 4 (4 to 8 allowance) Line-out Level/impeadance: 2.0V/20k load(full scale) 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 between SSG output and antenna in

37、put.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 of the disc TERMINAL Micropro

38、cessor commands FMO TC9490FA 40 FEED MOTOR +TERMINAL IC561 6 REST SW When the disc correctly rotates Tracking Servo Loop ON Servo CLV Rough Servo AccelerationAccelerationAcceleration Microprocessor commands Spindle motor (-) IC561 4 0.5 Sec 0.5 Sec 3.3v FEO TA2147F1.6V TC9490FA38 1 3.3V 1.6V 41 1-13

39、 KD-S700GN/KD-S700BU KD-S7250 Feed Section Focus Section Tracking Section Spindle Section Is the voltage output at IC521 pin 40 3.3V or 0V? Check the feed motor. Is 4V present at both sides of the feed motor? Is the wiring for IC521 (57) (63) correct? Check IC561. Is 6V or 2V present at IC561 6 and

40、7? Is 3.3V present at IC561 pin 20? Check the 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 IC561 pins 15 18. Check the pickup and its connections. NO YES YES YES Does th

41、e S-search waveform appear at IC561 pins 8 and 9? Is the disk rotated? Does the RF signal appear at TP1? Is 4V present at IC561 pins 4 and 5 ? Check the spindle motor and its wiring. Is 3.3V present at IC521 pin 41 ? Check the vicinity of IC581. Check IC501 and IC521. YES NO NO NO NONO YES YES YES C

42、heck the circuits in the vicinity of IC501 2 7 18 23or the pickup Is the RF waveform at TP1 normal? Proceed to the Tracking section When the disc is rotated at first: Check the circuit in the vicinity of IC501 pins 2 7,10,11 Check IC521. Check the pickup and its connections. YESYES YES Is the tracki

43、ng error signal output at IC501 11? Approx. 0.8 V 4V 1-14 KD-S700GN/KD-S700BU KD-S7250 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 diod

44、e 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 Normal 1.3 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 boa

45、rd 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 lower than the specified value,the laser diode is almost worn out, and t

46、he 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 cord from the ac outlet. Replace the pickup with a normal one.(Refer to Pic

47、kup 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. Play a disc. Check the eye-pattern at TP1. Finish. 1-15 KD-S700GN/KD-S700

48、BU KD-S7250 2 1 11 12 10 1513 14 5 4 6 38 9 7 ILM AJGNDGND 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 OUT COMPOUT VDD OUT SW5VOUT ILMOUT C7 0.1u C8 0.1u R1 UNIT R: C:F note1) TAB (header of IC) connecte

49、d to GND HA13164A(IC901):Regulator 1.Terminal 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 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