Jvc-CHX-550-Service-Manual 电路图 维修手册.pdf

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1、SERVICE MANUAL COPYRIGHT 2003 VICTOR COMPANY OF JAPAN, LTD. No.49787 2003/01 CH-X550 CD CHANGER 49787200301 CH-X550 TABLE OF CONTENTS 1Important Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 2Disassembly m

2、ethod . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 3Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3、 1-20 4Description of major ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27 Area Suffix E - Continental Europe RadioFans.CN 收音机爱 好者资料库 CH-X550 1-2 (No.49787) SECTION 1 Important Safety Precautions 1.1 Safety Precau

4、tions ! 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. ! 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

5、机爱 好者资料库 CH-X550 (No.49787)1-3 1.2 Preventing 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 care to prevent this when performing repairs. 1

6、.2.1 Grounding to prevent damage by static electricity Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as DVD players. Be careful to use proper grounding in the area where repairs are being performed. (1) Ground the workbench Ground the workbench by l

7、aying conductive material (such as a conductive sheet) or an iron plate over it before placing the traverse unit (optical pickup) on it. (2) Ground yourself Use an anti-static wrist strap to release any static electricity built up in your body. (3) Handling the optical pickup In order to maintain qu

8、ality 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.) Do not use a tester to check the condition of the laser diode in the optical pick

9、up. The testers internal power source can easily destroy the laser diode. 1.3 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.

10、 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 the connector. (3) Handle the flexible cable carefully as it may break w

11、hen subjected to strong force. (4) I t is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it. 1.4 Attention when traverse unit is decomposed *Please refer to Disassembly method in the text for the CD pickup unit. Apply solder to the short land before the flex

12、ible wire is disconnected from the connector on the CD pickup unit. (If the flexible wire is disconnected without applying solder, the CDpickup may be destroyed by static electricity.) In the assembly, be sure to remove solder from the short land after connecting the flexible wire. 1M (caption) Anti

13、-static wrist strap Conductive material (conductive sheet) or iron plate Pickup Short-circuit point (Soldering) Flexible wire PickupShort-circuit point RadioFans.CN 收音机爱 好者资料库 CH-X550 1-4 (No.49787) SECTION 2 Disassembly method 2.1 Replacement of the pickup (1) After removing the exterior (top and b

14、ottom). (2) Proceed to the pickup replacement section. (3) When applying grease, refer to the exploded view. Use new grease. 2.2 Mechanism section (1) Remove the exterior (required section only). (2) The mechanism section is designed so that each unit can be removed separately. (3) When reassembling

15、, refer to the assembling precautions (Use new grease when applying grease.) 2.3 Exterior section 2.3.1Removing the bottom cover and front panel assembly (See Fig.1 to 4) (1) Remove the two screw A to unlock the mounting direction knob located on the side of the main unit. (2) Turn the mounting dire

16、ction knob in the direction of the ar- row using a coin, etc. to remove it. (The knob can be re- moved only when it is set to this position.) (3) Remove the four top cover fixing screws B at the triangle marks on the side of the main unit. (Perform the same op- eration on both sides.) (4) Turn the u

17、nit upside down so the bottom surface is facing upward. (5) Lift the rear edge of the bottom cover slightly and lift the side by grasping the DIN jack section on the side panel, then turn it toward the front (raise upward) to remove the bottom cover. (6) Unhook the four catches located on both sides

18、 of the front panel, and turn the front panel toward the top cover (lower down) to remove the front panel. Fig.1 Fig.2 Fig.3 Fig.4 A B Remove A and turn in the direction of the arrow. B B B Bottom cover Knob Remove A and turn in the direction of the arrow BB A B B Bottom cover Knob The front panel c

19、an be separated by raising the cover. Slightly lift the jack section to remove. Bottom cover Unhook catches Unhook catches Front panel CH-X550 (No.49787)1-5 2.3.2Removing the top cover (See Fig.5 to 9) (1) Remove the four damper bracket fixing screws C to re- move the damper brackets. (2) Pull out t

20、he dampers, being careful not to damage them. When reattaching a damper, insert your finger to push out the center of the damper to mount it on the damper shaft, as shown in Fig. 6-1. (3) Turn the damper spring bracket toward the top at a right an- gle as shown in Fig. 7, then push down the lower si

21、de of the damper spring bracket to lift it off. (4) Remove the three fixing screws D and E on the DIN jack board assembly. (5) Lift the changer unit upward. (6) Remove the damper springs from the mechanism chassis if required. To reassemble, refer to the diagram below. Fig.5 Fig.6 Fig.6-1 Fig.7 Fig.

22、8 Fig.8-1 Fig.9 C C Damper Damper bracket Damper Damper bracket C C Damper Damper bracket Damper bracket Damper Apply alcohol to the shaft then immediately attach the damper. (After attaching, check that the shaft is correctly inserted.) Push out with your finger before attaching Damper shaft Damper

23、 Turn to the top position (at a right angle), then push down to lift off. Damper spring bracket Lift the changer unit upward How to attach the damper springs Silver (mechanism side) Black (magazine side) Mechanism Chassis Damper spring Damper spring Remove the flexible ribbon wire if required E E D

24、DIN jack board CH-X550 1-6 (No.49787) 2.3.3Removing the fittings (See Fig.10) (1) Remove the fixing screw F. (2) Unhook the two catches a on the top edge of the fitting, then unhook the two catches b at the left/right bottom edg- es. Fig.10 2.3.4Removing the main PCB assembly (See Fig.11) (1) Remove

25、 the power IC fixing screw G. (2) Remove the four screws H securing the main board as- sembly. (3) Disconnect position motor wire connector CN504 from the main board assembly. (4) Disconnect sensor board assembly wire connector CN601 from the main board assembly. (5) Remove the flexible ribbon wire

26、from CN502 on the traverse mechanism board assembly. When reinstalling the board boards, refer to the reassembling procedures for protecting switches, etc. Fig.11 Catches a Catches b Fitting F H CN601 CN504 CN502 H G H Main board CH-X550 (No.49787)1-7 2.4 CD mechanism assembly 2.4.1Sensor assembly u

27、nit (See Fig.1) (1) Remove the two screws I securing the sensor assembly unit. (2) Unhook the spring on the back of the sensor assembly unit from the holes on the chassis. 2.4.2Magazine lock arm (See Fig.1 and 2) (1) Remove the magazine lock spring from the front side of the chassis. (2) Remove the

28、poly-washer c securing the magazine lock arm. (3) Turn the magazine lock arm in the direction of the arrow un- til the notch is at the d position to remove it from the chas- sis. Fig.1 Fig.2 2.4.3Positioning motor assembly (See Fig.3) (1) Remove the two screws J securing the positioning motor. (2) S

29、lightly lift the positioning motor assembly to remove it from the two burrs on the chassis. Fig.3 Sensor assembly I Spring I Rear Magazine lock spring Poly-washer c d Positioning motor assembly J CH-X550 1-8 (No.49787) 2.4.4Rear slider (See Fig.4) (1) Position the unit with the front section facing

30、down. Rotate the third gear located on the back of the main unit in the di- rection of the arrow (clockwise). (2) Shift the rear slider in the direction of the arrow and remove it at the rear slider mounting position (at the widest hole). Fig.4 2.4.5Front slider (See Fig.5) (1) Position the unit wit

31、h the rear section facing down. Rotate the third gear located on the bottom of the unit in the direction of the arrow (clockwise) until the front slider is shifted to the outermost position. (2) Remove the E-washer securing the front slider to remove the front slider from the chassis Fig.5 2.4.6Top

32、plate (See Fig.6 and 7) (1) Remove the nine screws K securing the top plate. (2) Disconnect the section e attached to the rear of the unit, then lift the top plate slightly. (3) Slide the top plate toward the rear of the unit to remove the upper rod from the top plate. Fig.6 Fig.7 Can be removed at

33、the stud position (at the widest hole) Remove Shift Third gear Rear slider Remove the E-washer Third gear Front slider Slide and remove the rod inside Slide Top plate K K K Rod After lifting e Remove K Top plate CH-X550 (No.49787)1-9 2.4.7Lifter unit (See Fig.8 and 9) (1) Unhook the elevator spring

34、located on the front side of the unit. (Be sure to first unhook the spring from the lifter side as shown in the upper part of the diagram.) (2) Lift the lifter unit upward, then remove the lower rod to re- move the lifter unit from the chassis. Fig.8 Fig.9 2.4.8Lifter bracket (See Fig.10) (1) Remove

35、 the two lifter bracket fixing screws L located on the back of the lifter unit. (2) Remove the lower rod. Fig.10 2.4.9Side bracket and traverse mechanism assembly (See Fig.11) (1) Remove the two side bracket unit fixing screws M to dis- connect the side bracket unit from the lifter unit. (2) Remove

36、the three shafts on the traverse mechanism as- sembly from the lifter unit. CAUTION: For reassembling, refer to the reassembling procedures. Fig.11 Unhook this part first Proper orientation Spring Lift up the lifter unit Lower rod Lifter unit L L Lifter bracket Remove from the lifter unit Remove fro

37、m the lifter unit M M Lifter unit Side bracket Traverse mechanism assembly CH-X550 1-10 (No.49787) 2.4.10 Removing the mechanism board / pickup assembly (See Fig.12 to 15) (1) Remove the three screws N fixing the mechanism board on the back of the traverse mechanism. (2) Disconnect the two feed moto

38、r wires (blue and white), two spindle motor wires (red and black) and two tray motor wires (brown and black) that are soldered to the mechanism board. (3) Short-circuit the grounding point on the mechanism board. Move the mechanism board without disconnecting the wire from connector CN501. Solder th

39、e short circuit round on the pickup assembly. (4) Disconnect the wire from connector CN501 on the mech- anism board. (5) Remove the screw O to remove the feed motor assembly. (6) Remove the screw P to remove the shaft holder retaining the feed slide shaft assembly and the middle gear. (7) Move the m

40、iddle gear. (8) Move the pickup assembly upward from the gear section and remove it from the traverse chassis assembly. (9) Remove the two screws Q to remove the rack arm. (10) Pull out the feed slide shaft assembly. (11) Remove the screw R to remove the spring. CAUTION: To reattach the mechanism bo

41、ard, connect the pickup flex- ible wire to connector CN501 on the mechanism board be- fore unsoldering the short circuit round. Subsequently, fix the mechanism board using screws. Fig.12 Fig.13 Fig.14 Fig.15 Brown and black N N Red and black Blue and white Mechanism board CN501 Short circuit round (

42、Grounding point) Pickup Flexible wire Grounding point Pickup assembly Shaft holder Feed slide shaft assembly Middle gear Feed motor P O Chassis Remove gears and motors only when required. Rack arm Pull out R Q Spring CH-X550 (No.49787)1-11 2.4.11 Tray motor (See Fig.16 and 17 ) (1) Remove the two sc

43、rews S securing the tray motor. (2) Remove the two screws T to remove the tray motor as- sembly from the tray motor holder. Fig.16 Fig.17 2.4.12 Separation of the chassis (L) assembly and chassis (R) assembly (See Fig.18 ) (1) Remove the two screws U retaining the chassis (L) and (R) assemblies. (2)

44、 Slide the chassis (L) assembly toward the front and detach it, then remove the chassis (L) upward. Fig.18 Tray motor assembly S S Tray motor Tray motor holder T Front side U U Slide and remove upward as shown by the arrow Chassis (L) assembly Chassis (R) assembly CH-X550 1-12 (No.49787) 2.4.13 Prec

45、autions on reassembling CAUTION: When reassembling, also refer to the disassembling proce- dures. 2.4.13.1Mounting the traverse mechanism (See Fig.19 to 23) (1) When mounting the pickup assembly, attach the feed slide shaft assembly to the traverse chassis.Apply E-JC-525 grease to the shaft. (2) Mou

46、nt the middle gear and the feed slide shaft to the traverse chassis and secure them with the screw P through the shaft holder. (3) Before mounting the mechanism board, move the pickup to the outer edge position, then secure the board assembly using the screw N. At this time, check that the rest swit

47、ch is correctly placed. (4) To mount the rack arm, first move the pickup to the middle position and secure it with the screws Q. CAUTION: To reattach the mechanism board, connect the pickup flexible wire to connector CN501 on the mechanism board before un- soldering the short circuit round. Subseque

48、ntly, fix the mech- anism board using screws. Fig.19 Fig.20 Fig.21 Fig.22 Fig.23 Pickup assembly Attached to chassis Shaft holder Middle gear Motor Chassis Mounting the feed motor assembly P Feed slide shaft (half coated with grease) Pickup assembly Attached to chassis Shaft holder Middle gear Motor

49、 Chassis Mounting the feed motor assembly P Feed slide shaft (half coated with grease) Rack arm Q Move the pickup to the middle position Mechanism board N N N CN501 Short circuit round (Grounding point) Pickup Flexible wire CH-X550 (No.49787)1-13 2.4.13.2 Mounting the lifter unit (See Fig.24 to 26) (1) Insert the shafts f of the traverse mechanism assembly into the slide grooves g on the lifter unit. (2) Shift the hook of the lifter unit to the edge, and shift the slid- ing lever inside the side bracket unit to the edge as well. (3) With each hole and lever shi