Jvc-CHX-470-RF-Service-Manual 电路图 维修手册.pdf

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1、SERVICE MANUAL CD CHANGER No.49668 Dec. 2001 COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD. CH-X470RF CH-X470RF Area Suffix COMPACT DISC CHANGER12DISC Contents Safety precaution Preventing static electricity Disassembly method Forced eject procedures 1-2 1-3 1-4 1-20 Trouble shooting Flow of functiona

2、l operation until TOC read Description of major ICs 1-21 1-23 1-27 J - Northern America KS-RF50CH-X470 CH-X470RF is a combination of CH-X470 and KS-RF50. KS-RF50 is a combination of Remote control and the RF unit. RadioFans.CN 收音机爱 好者资料库 CH-X470RF 1-2 ! Burrs formed during molding may be left over o

3、n 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 case of an adjustment or operation check. RadioFans.CN 收音机爱 好者资料库 CH-X470RF 1-3 Preventing st

4、atic 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 care to prevent this when performing repair

5、s. 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 are being performed. 2-1 Ground the workbe

6、nch 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 up in your body. 3. Handling the optical pi

7、ckup 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 not use a tester to check the condition of t

8、he 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 unit. 2. Cut off the shorted part of the flex

9、ible 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 the connector. 3. Handle the flexible cabl

10、e 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 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 i

11、n 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 detach the substrate.

12、 (caption) Anti-static wrist strap Conductive material (conductive sheet) or iron plate Soldering Pickup unit Traverse mechanism PCB Assy RadioFans.CN 收音机爱 好者资料库 CH-X470RF 1-4 After removing the exterior (top and bottom). Proceed to the pickup replacement section. When applying grease, refer to the

13、exploded view. Use new grease. 1. 2. 3. Remove the exterior (required section only). The mechanism section is designed so that each unit can be removed separately. When reassembling, refer to the assembling precautions. (Use new grease when applying grease.) 1. 2. 3. Disassembly method Remove the tw

14、o screw A to unlock the mounting direction knob located on the side of the main unit. Turn the mounting direction knob in the direction of the arrow using a coin, etc. to remove it. (The knob can be removed only when it is set to this position.) Remove the four top cover fixing screws B at the trian

15、gle marks on the side of the main unit. (Perform the same operation on both sides.) Turn the unit upside down so the bottom surface is facing upward. 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 (r

16、aise upward) to remove the bottom cover. Unhook the four catches located on both sides of the front panel, and turn the front panel toward the top cover (lower down) to remove the front panel. 1. 2. 3. 4. 5. 6. Removing the bottom cover and front panel assembly (See Fig.1 to 4) Perform operations ac

17、cording to the items to be disassembled. Fig. 1 Fig. 2 Fig. 3 Fig. 4 A Unhook catches Unhook catches B The front panel can be separated by raising the cover. Remove A and turn in the direction of the arrow Remove A and turn in the direction of the arrow. Slightly lift the jack section to remove. B B

18、 B BB A B B Bottom cover Knob Bottom cover Knob Bottom cover Front panel CH-X470RF 1-5 Remove the four damper bracket fixing screws C to remove the damper brackets. Pull out the dampers, being careful not to damage them. When reattaching a damper, insert your finger to push out the center of the dam

19、per to mount it on the damper shaft, as shown in Fig. 6-1. Turn the damper spring bracket toward the top at a right angle as shown in Fig. 7, then push down the lower side of the damper spring bracket to lift it off. Remove the three fixing screws D and E on the DIN jack board assembly. Lift the cha

20、nger unit upward. Remove the damper springs from the mechanism chassis if required. To reassemble, refer to the diagram below. 1. 2. 3. 4. 5. 6. Removing the top cover (See Fig.5 to 9) Fig. 5 Turn to the top position (at a right angle), then push down to lift off. Lift the changer unit upward How to

21、 attach the damper springs Silver (mechanism side) Black (magazine side) Mechanism Chassis Remove the flexible ribbon wire if required C 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 atta

22、ching C C C E E D Fig. 6 Fig. 7 Fig. 9 Fig. 6-1 Fig. 8 Fig. 8-1 Damper shaft Damper Damper spring Damper spring DIN jack board Damper spring bracket Damper Damper bracket Damper Damper bracket Damper Damper bracket Damper bracket Damper CH-X470RF 1-6 Remove the fixing screw F. Unhook the two catches

23、 a on the top edge of the fitting, then unhook the two catches b at the left / right bottom edges. 1. 2. Removing the fittings (See Fig.10) Remove the power IC fixing screw G. Remove the four screws H securing the main board assembly. Disconnect position motor wire connector CN504 from the main boar

24、d assembly. Disconnect sensor board assembly wire connector CN601 from the main board assembly. Remove the flexible ribbon wire from CN502 on the traverse mechanism board assembly. When reinstalling the board boards, refer to the reassembling procedures for protecting switches, etc. 1. 2. 3. 4. 5. R

25、emoving the main PCB assembly (See Fig.11) Catches a Catches b Fitting F H CN601 CN504 CN502 H G Fig. 10 Fig. 11 H Main board CH-X470RF 1-7 Remove the two screws I securing the sensor assembly unit. Unhook the spring on the back of the sensor assembly unit from the holes on the chassis. 1. 2. Sensor

26、 assembly unit (See Fig.12) Remove the magazine lock spring from the front side of the chassis. Remove the poly-washer c securing the magazine lock arm. Turn the magazine lock arm in the direction of the arrow until the notch is at the d position to remove it from the chassis. 1. 2. 3. Magazine lock

27、 arm (See Fig.12 and 13) Remove the two screws J securing the positioning motor. Slightly lift the positioning motor assembly to remove it from the two burrs on the chassis. 1. 2. Positioning motor assembly (See Fig.14) Sensor assembly I Spring Rear Magazine lock spring Poly-washer c d Positioning m

28、otor assembly J Fig. 12 Fig. 13 Fig. 14 I CH-X470RF 1-8 Position the unit with the front section facing down. Rotate the third gear located on the back of the main unit in the direction of the arrow (clockwise). Shift the rear slider in the direction of the arrow and remove it at the rear slider mou

29、nting position (at the widest hole). 1. 2. Rear slider (See Fig.15) Position the unit with 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. Remove the E-washer

30、securing the front slider to remove the front slider from the chassis 1. 2. Front slider (See Fig.16) Remove the nine screws K securing the top plate. Disconnect the section e attached to the rear of the unit, then lift the top plate slightly. Slide the top plate toward the rear of the unit to remov

31、e the upper rod from the top plate. 1. 2. 3. Top plate (See Fig.17 and 18) Can be removed at the stud position (at the widest hole) Remove Shift Third gear Remove the E-washer Third gear Slide and remove the rod inside Slide Top plate After lifting e Fig. 15 Fig. 16 Fig. 17 Fig. 18 K K K Remove K Re

32、ar slider Front slider Rod Top plate CH-X470RF 1-9 Unhook the elevator spring 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.) Lift the lifter unit upward, then remove the lower rod to remove the lifter unit f

33、rom the chassis. 1. 2. Lifter unit (See Fig.19 and 20) Remove the two lifter bracket fixing screws L located on the back of the lifter unit. Remove the lower rod. 1. 2. Lifter bracket (See Fig.21) Remove the two side bracket unit fixing screws M to disconnect the side bracket unit from the lifter un

34、it. Remove the three shafts on the traverse mechanism assembly from the lifter unit. 1. 2. Side bracket and traverse mechanism assembly (See Fig.22) For reassembling, refer to the reassembling procedures. CAUTION: Unhook this part first Proper orientation Lift up the lifter unit Lower rod Remove fro

35、m the lifter unit Remove from the lifter unit Fig. 19 Fig. 20 Fig. 21 L L Fig. 22 M M Spring Lifter unit Lifter unit Side bracket Traverse mechanism assembly Lifter bracket CH-X470RF 1-10 Remove the three screws N fixing the mechanism board on the back of the traverse mechanism. Disconnect the two f

36、eed motor 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. Short-circuit the grounding point on the mechanism board. Move the mechanism board without disconnecting the wire from connector CN501. Solde

37、r the short circuit round on the pickup assembly. Disconnect the wire from connector CN501 on the mechanism board. Remove the screw O to remove the feed motor assembly. Remove the screw P to remove the shaft holder retaining the feed slide shaft assembly and the middle gear. Move the middle gear. Mo

38、ve the pickup assembly upward from the gear section and remove it from the traverse chassis assembly. Remove the two screws Q to remove the rack arm. Pull out the feed slide shaft assembly. Remove the screw R to remove the spring. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. Removing the mechanism board / pic

39、kup assembly (See Fig.23 to 26) To reattach the mechanism board, connect the pickup flexible wire to connector CN501 on the mechanism board before unsoldering the short circuit round. Subsequently, fix the mechanism board using screws. CAUTION: Brown and black Grounding point N Pickup assembly Shaft

40、 holder Feed slide shaft assembly Middle gear Feed motor Rack arm Pull out R Q P O Chassis Remove gears and motors only when required. Fig. 23 Fig. 24 Fig. 26Fig. 25 N Spring Red and black Blue and white Mechanism board Short circuit round (Grounding point) Pickup Flexible wire CN501 CH-X470RF 1-11

41、Remove the two screws S securing the tray motor. Remove the two screws T to remove the tray motor assembly from the tray motor holder. 1. 2. Tray motor (See Fig.27 and 28) Remove the two screws U retaining the chassis (L) and (R) assemblies. Slide the chassis (L) assembly toward the front and detach

42、 it, then remove the chassis (L) upward. 1. 2. Separation of the chassis (L) assembly and chassis (R) assembly (See Fig.29) Tray motor assembly Tray motor Tray motor holder Front side S T U U Slide and remove upward as shown by the arrow Fig. 27 Fig. 28 Fig. 29 S Chassis (L) assembly Chassis (R) ass

43、embly CH-X470RF 1-12 When mounting the pickup assembly, attach the feed slide shaft assembly to the traverse chassis. Apply E-JC-525 grease to the shaft. Mount the middle gear and the feed slide shaft to the traverse chassis and secure them with the screw P through the shaft holder. Before mounting

44、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 switch is correctly placed. To mount the rack arm, first move the pickup to the middle position and secure it with the screws Q. 1. 2. 3. 4. Mounting t

45、he traverse mechanism (See Fig.30 to 34) When reassembling, also refer to the disassembling procedures. CAUTION: To reattach the mechanism board, connect the pickup flexible wire to connector CN501 on the mechanism board before unsoldering the short circuit round. Subsequently, fix the mechanism boa

46、rd using screws. CAUTION: Pickup assembly Attached to chassis Shaft holder Middle gear Motor Chassis Mounting the feed motor assembly Feed motor Shaft holder Spindle motor Mechanism board Rack arm N Q P Feed slide shaft (half coated with grease) Move the pickup to the middle position Fig. 30 Fig. 31

47、 Fig. 33 Fig. 32 N N CN501 Fig. 34 Short circuit round (Grounding point) Pickup Flexible wire CH-X470RF 1-13 Insert the shafts f of the traverse mechanism assembly into the slide grooves g on the lifter unit. Shift the hook of the lifter unit to the edge, and shift the sliding lever inside the side

48、bracket unit to the edge as well. With each hole and lever shifted to the edge, mount the lifter unit and side bracket unit from the side. (Check each attached section, and check that the two shafts h of the lifter unit are correctly inserted into the holes i of the side bracket unit. After mounting

49、, check that the levers move together. ) Turn the lifter unit upside down. As shown in Fig. 35, slide the lever 30 mm away from the edge, then mount the lifter bracket assembly. 1. 2. 3. 4. Mounting the lifter unit (See Fig.35 to 37) f f f h Attach Shift inside by approx. 30 mm Expanded view i g g g Fig. 35 Fig. 36 Fig. 37 Lifter unit M Side bracket Traverse mechanism assembly Lifter bracket CH-X470RF 1-14 Attach the lower rod to the chassis (R) assembly. While shifting the rod toward the front side, mount the rod on t