Jvc-KDSH-77-R-Service-Manual(1) 电路图 维修手册.pdf

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1、SERVICE MANUAL CD RECEIVER No.49634 Mar. 2001 COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD. KD-SH77R/KD-SH55R KD-SH77R/KD-SH55R Area Suffix E EX Continental Europe Central Europe Difference point KD-SH77R KD-SH55R DVD control O X LINE IN O X SUBWOOFER OUT O X EXT OUT O X Contents Safety precaution Pr

2、eventing static electricity Disassembly method Adjustment method Flow of functional operation until TOC read Maintenance of laser pickup Replacement of laser pickup Description of major ICs 1-2 1-3 1-4 1-15 1-17 1-19 1-19 1-2035 KD-SH77R KD-SH55R ANGLE RM-RK100 EQ CD FM AM CH AUXSEL VOLUME R D ATT R

3、adioFans.CN 收音机爱 好者资料库 KD-SH77R/KD-SH55R 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

4、case of an adjustment or operation check. RadioFans.CN 收音机爱 好者资料库 KD-SH77R/KD-SH55R 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 Electrostati

5、c 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 care to prevent this when performing repairs. 2.About the earth processing for the destruction prevention by static electric

6、ity 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 are being performed. 2-1 Ground the workbench Ground the workbench by laying conductive material (such as a conductive shee

7、t) 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 up in your body. 3. Handling the optical pickup 1. In order to maintain quality during transport and before installation, bo

8、th 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 not use a tester to check the condition of the laser diode in the optical pickup. The testers internal power source can easil

9、y 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 unit. 2. Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific d

10、etails, 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 the connector. 3. Handle the flexible cable carefully as it may break when subjected to strong force. 4. It is not possible

11、 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 Attention when traverse unit is decomposed 1.Solder is put up before the card wire is removed from connector on the CD subs

12、trate 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 with when you install picking up in the substrate. *Please refer to Disassembly method in the text for pick-up and how to detac

13、h the substrate. RadioFans.CN 收音机爱 好者资料库 KD-SH77R/KD-SH55R 1-4 Press the release button in the lower right part of the front panel assembly to unlock. Remove the front panel assembly in the direction of the arrow. 1. 2. Disassembly method Removing the front panel assembly (See Fig.1) Turn on power.

14、Press the eject button in the upper left part of the front panel assembly to move the assembly as shown in Fig.2 and turn off power. Remove the two screws A on the upper side of the body. 1. 2. Removing the top chassis (See Fig.2 to 6) Fig.1 Fig.2 Front panel assembly Release button Front panel asse

15、mbly Eject button Top chassis Fig.3 Front panel assembly Top chassis AA KD-SH77R/KD-SH55R 1-5 Remove the three screws B on both sides of the body. Remove the screw C and the three screws D on the left side of the body. Remove the two screws E and the screw F on the back of the body. Move the top cha

16、ssis upward and remove it with the CD mechanism assembly. The connector on the CD mechanism assembly is disconnected from connector CN601 on the main board. 3. 4. 5. 6. Fig.6 (KD-SH55RE)Fig.6 (KD-SH77RE) Fig.4 Fig.5 BB Top chassis Top chassis BD C EFE F Heat sink KD-SH77R/KD-SH55R 1-6 Prior to perfo

17、rming the following procedure, remove the top chassis. Remove the three screws G inside the top chassis and remove the CD mechanisma ssembly. 1. Removing the CD mechanism assembly (See Fig.7) Prior to performing the following procedure, remove the top chassis. Disconnect the wire from connector CN70

18、3 on the main board. Remove the motor bracket and the spring attached to the arm braket assembly (R). Remove the two screws H attaching the motor bracket. Remove the washer attaching the clutch assembly and pull out the clutch assembly from the shaft. Remove the two screws I and the motor assembly f

19、rom the motor bracket. 1. 2. 3. 4. 5. Removing the motor assembly (See Fig.8 to 10) Fig.7 Fig.8 Fig.9 Fig.10 Top chassis G G G CD mechanisma ssembly Arm braket assembly (R) Motor assembly Motor braketSpring Motor assembly Motor braket Motor braket CN601 CN703 H H Main board R Clutch assembly Washer

20、KD-SH77R/KD-SH55R 1-7 Prior to performing the following procedures, remove the top chassis and the motor bracket. Disconnect the flexible wire from connector CN701 and CN702 on the main board respectively. Move the front bracket backward until it stops. Remove the four screws J attaching the arm bra

21、ckets (L) and (R). Move the right and arm lefter brackets from the rod gear. Remove the rod gear. Remove the screw K attaching the rear panel to the bottom cover on the back of the body. 1. 2. 3. 4. 5. Removing the main board (See Fig.11 to 15) Fig.13 (KD-SH55RE)Fig.13 (KD-SH77RE) Fig.12 Fig.11 Main

22、 boardLL JJ J Arm brackets (L) Arm brackets (R) CN701 CN702 Rod gear Arm brackets (L) Arm brackets (R) Main board Rod gear Bottom coverBottom cover KK Rear panelRear panel KD-SH77R/KD-SH55R 1-8 Remove the two screws L and move the main board backwards to release the two joints a. (The main board wil

23、l be removed with the rear panel and the rear heat sink) Remove the screw M and N attaching the rear heat sink. Remove the two screws O and the screw P attaching the rear panel. Remove the mainboard (KD-SH55RE). Remove the three screws O and the screw P attaching the rear panel. Remove the main boar

24、d (KD-SH77RE). 6. 7. 8. 9. Prior to performing the following procedures, remove the top chassis, the motor bracket and the main board. Remove the two screws Q attaching the lifter switch board. 1. Removing the lifter switch board (See Fig.16) Fig.15 (KD-SH55RE)Fig.15 (KD-SH77RE) Fig.14 Fig.16 Joint

25、a Joint a Main board Rear panel Rear panel O OM M N NP P Rear heat sink Rear heat sink Bottom cover Lifter switch board Q KD-SH77R/KD-SH55R 1-9 Prior to performing the following procedure, remove the top chassis assembly and thefront panel assembly. Disconnect the flexible wire from connector CN702

26、on the main board. Remove the four screws R attaching the front bracket on both sides of the body. Push the pin of the joint c on the front of the front bracket to release the lock lever. 1. 2. 3. Removing the lifter board (See Fig.17 to 23) Fig.17 Fig.18 Fig.19Fig.20 Front bracket Main board CN702

27、Front bracket Front bracket R R Lock lever Front bracket Joint c KD-SH77R/KD-SH55R 1-10 Remove the screw S attaching the lifter board cover in the rear of the front bracket. Release the two joints d while pushing the front side. Move the lifter board cover inthe direction of the arrow and release th

28、e eight joints e. Remove the two screws T attaching the lifter board on the front of the body. 4. 5. 6. Fig.21 Fig.22 Fig.23 Joints e Joints e Joints e Joint e S Joint d Joint d Front bracket Lifter board cover Lifter board Lifter board cover T KD-SH77R/KD-SH55R 1-11 Remove the four screws U attachi

29、ng the rear panel to the front panel assembly. Release the eleven joints f of the front panel and the rear panel. Disconnect the wire from connector CN503 on the front board. If necessary, unsolder connector CN502 on the front board. 1. 2. 3. 4. Removing the front board (See Fig.24 and 25) Prior to

30、performing the following procedure, remove the rear panel. Remove the two screws W attaching the volume board. Disconnect the volume knob, ring lens and volume ring from the volume board. If necessary, unsolder the volume board. 1. 2. 3. Removing the volume board (See Fig.25 and 26) Prior to perform

31、ing the following procedure, remove the rear panel. Disconnect the wire from connector CN503 on the front board. Pull out the line in board from the front panel assembly. 1. 2. Removing the line in board (See Fig.25 and 27) Prior to performing the following procedure, remove the front panel assembly

32、. Fig.24 Fig.25 Fig.26 Fig.25 Joint f 11 Rear panel U U U U Front board Soldering (CN502) Soldering Volume boardW W V V CN503 Line in board Rng knob Volume lens, Volume ring Volume board Line in board KD-SH77R/KD-SH55R 1-12 Unsolder the part a and b on the CD mechanism control board. Remove the stat

33、or 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 mechanism control board in the direction of the arrow while releasing it from the two damper bracket sl

34、ots 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 direction of the arrow to move the entire pickup unit to the appropriate position where the flexible wi

35、re 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 attaching the CD mechanism assembly and the front bracket. Remove the two screws B and the front bracket wh

36、ile 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 unit FD gear CD mechanism control board Loading motorFront bracket Front bracket Pull outward Pull outward

37、 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 KD-SH77R/KD-SH55R 1-13 Prior to performing the following procedure, remove the CD mechanism control board and the front bracket (loading motor). Remove t

38、he 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 assembly and the two springs h attaching the flame. Remove the two screws E and both sides rear da

39、mper 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 removed if only the rear damper bracket on the left side is removed. ATTENTION: Fig.6 Fig.7 Fig.8

40、 Fig.9 Rear damper bracket Fix arm (R) Damper DD Damper bracket CD mechanism assembly Flameh h D D Fig.1 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-SH77R/KD-SH55R

41、1-14 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. Removing the feed motor assembly (See Fig.10) Prior to performing the following procedure,

42、 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 pulling out the part i of the FD screw. 1. Remove the screw G attaching the nut push

43、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 part i of the FD screw. ATTENTION: Prior to performing the following procedure, remove

44、 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 arms. Open the clamper arm upward. Turn the turn table, and remove the two screws H a

45、nd 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 plate Pickup mount nut Pickup unit FD screw G H H KD-SH77R/KD-SH55R 1-15 Adjustment me

46、thod 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 meter 8. Test Disc JVC :CTS-1000 9. Extension cable for check EXTGS004-26P 1 S

47、tandard measuring conditions Power supply voltage DC14.4V(10.516V) Load impedance 20Kohm(2 Speakers connection) Output Level KD-SH77R Line out 4.0V (Vol. MAX) KD-SH55R 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

48、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 Bass Digital: 0) RF signal Flow of functional operation until TOC read W

49、hen 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 correctly rotates Tracking Servo Loop ON Servo CLV Rough Servo AccelerationAccelerationAcceleration Microprocessor commands Spindle motor (-) IC581 7 0.5 Sec 0.5 Sec KD-SH77R/KD-SH55R 1-18 Feed Section Focus Section Tracking Section Spindle Section Is the voltage output at IC521 pin 53 5V or 0V? Check the fee