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JVC CH-X460 Service Manual

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SERVICE MANUAL
Contents
Safety precaution
Preventing static electricity
Disassembly method
Forced eject procedures
CD CHANGER
CH-X460
1-2
1-3
1-4
1-20
COPYRIGHT
2002 VICTOR COMPANY OF JAPAN, LTD.
U ---------------- Other Areas
Trouble shooting
Flow of functional
operation until TOC read
Description of major ICs
CH-X460
Area Suffix
1-21
1-23
1-27
No.49697
Feb. 2002

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Summary of Contents for JVC CH-X460

  • Page 1 CH-X460 SERVICE MANUAL CD CHANGER CH-X460 Area Suffix U ---------------- Other Areas Contents Safety precaution Trouble shooting 1-21 Preventing static electricity Flow of functional Disassembly method operation until TOC read 1-23 Forced eject procedures 1-20 Description of major ICs 1-27 No.49697...

  • Page 2: Safety Precaution

    CH-X460 Safety precaution 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...
  • Page 3 CH-X460 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 traverse unit (optical pickup). Take care to prevent this when performing repairs.

  • Page 4: Disassembly Method

    CH-X460 Disassembly method Perform operations according to the items to be disassembled. Bottom cover <Replacement of the pickup> After removing the exterior (top and bottom). Proceed to the pickup replacement section. Knob When applying grease, refer to the exploded view.
  • Page 5 CH-X460 Removing the top cover (See Fig.5 to 9) Remove the four damper bracket fixing screws C to Damper remove the damper brackets. Damper bracket Pull out the 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.
  • Page 6 CH-X460 Removing the fittings (See Fig.10) Catches a Remove the fixing screw F. Unhook the two catches a on the top edge of the Catches b fitting, then unhook the two catches b at the left / right bottom edges.
  • Page 7 CH-X460 <Changer mechanism section> Sensor assembly Sensor assembly unit (See Fig.12) 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. Spring Magazine lock arm (See Fig.12 and 13) Remove the magazine lock spring from the front side of the chassis.
  • Page 8 CH-X460 Can be removed at the stud position Rear slider (See Fig.15) Rear slider (at the widest hole) Remove Shift 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).
  • Page 9 CH-X460 Lifter unit (See Fig.19 and 20) 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 Unhook this part first diagram.)
  • Page 10 CH-X460 Removing the mechanism board / pickup CN501 Red and black assembly (See Fig.23 to 26) Brown and black Remove the three screws N fixing the mechanism board on the back of the traverse mechanism. Disconnect the two feed motor wires (blue and...
  • Page 11 CH-X460 Tray motor (See Fig.27 and 28) 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. Tray motor assembly Fig. 27 Tray motor holder Tray motor Fig.
  • Page 12 CH-X460 Pickup assembly <Precautions on reassembling> Attached to chassis CAUTION: When reassembling, also refer to the disassembling procedures. Shaft holder Mounting the traverse mechanism Feed slide shaft (half coated with grease) (See Fig.30 to 34) Middle gear When mounting the pickup assembly, attach the feed Motor slide shaft assembly to the traverse chassis.
  • Page 13 CH-X460 Mounting the lifter unit (See Fig.35 to 37) 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 bracket unit to the edge as well.
  • Page 14 CH-X460 Connection of the chassis (L) assembly Lifter unit and chassis (R) assembly (See Fig.38 to 40) Attach the lower rod to the chassis (R) assembly. While shifting the rod toward the front side, mount Lower Rod the rod on the lifter unit.
  • Page 15 CH-X460 Mounting the top plate (See Fig.41 to 44) Mount the upper rod on the lifter side l and set it on the rear of the top plate, then mount the other end of the upper rod to m. Check that the five points (n, o, p, s and r) are Upper rod correctly positioned.
  • Page 16 CH-X460 Mounting the front slider and rear slider Stud E-Washer Position so (See Fig.45 and 46) that the stud Front slider and right hole Position the unit with the rear side facing down, then are lined up rotate the third gear in the direction of the arrow...
  • Page 17 CH-X460 Mounting the sensor board assembly Sensor assembly fixing screws (See Fig.47) Attach the longer spring to the white resin, and attach the shorter spring temporarily to the sensor assembly bracket. Mount the sensor assembly so that the shaft of the...
  • Page 18 CH-X460 Main PCB assembly Third gear Pickup replacement procedure (See Fig.49 to 55) Remove the bottom cover, front panel and top cover from the exterior section. Unplug the flexible ribbon wire from connector CN502 on the traverse mechanism PC board assembly.
  • Page 19 CH-X460 Remove the two rack arm fixing screws Q. Pull out the feed slide shaft. Remove the shaft holder fixing screw R. When mounting the lifter bracket after replacing the pickup, shift the lifter unit lever approx. 30 mm Pickup towards the inside, then mount the lifter bracket.
  • Page 20 CH-X460 Forced eject procedures Magazine eject does not function. Completed RESET (Press EJECT for 3 sec.) Check that the trays remain no more than 10 mm inside the magazine. Are trays stored in the magazine? Check visually. Remove the bottom cover...

  • Page 21: Troubleshooting

    CH-X460 Troubleshooting Servicing procedures for CH-X460error displays Error display Servicing procedure E1: Eject error The magazine cannot be ejected until S601 (magazine switch) turns off. Can the magazine be ejected? YES 1, NO 1 The magazine switch (S601) does not turn off even though the magazine is completely ejected.
  • Page 22 CH-X460 CH-X460 Error code The following error codes can be displayed and stored in up to 3 memories when the KD-MX3000 is used with the controller. Refer to the KD-MX3000 service manual regarding error code indication. The error code indication when using the earlier controller is the same as the CH-X99,KD-MK88 and other 12CD changer models.
  • Page 23 CH-X460 Flow of functional operation until TOC read Power ON • When the laser diode correctly Set Function to CD • When the pickup correctly moves emits to the inner area of the disc Microprocessor $ 84 Microprocessor Disc inserted...

  • Page 24: General Section

    CH-X460 General section Turn the power on with no magazine loaded. Reset Move the lifter until it The lifter moves up or Check the linear position comes to the STOP down and stops. sensor (VR601). position (shipping position). The position motor does Check the wiring of the not function.
  • Page 25 CH-X460 Feed section Is the voltage output at Is the wiring for IC521 Is 5V present at IC581 Check CD 9V IC521 pin u 5V or 0V? (90) (100) correct? pin 6? and 5V. Check the vicinity of IC521. Is 4V present at both...
  • Page 26 CH-X460 Signal processing section Is the sound output from No sound from either Compare the L-ch and both channels (L, R)? channel. R-ch to locate the defective point. Normal Is 9V present at IC101 pin Check the vicinity of the...

  • Page 27: Description Of Major Ics

    Memory power detect input Unused output port PWR SW CRTL+B detect input Unused output port BUS INT JVC bus com start interrupt input CD ON CD power control Hi:on EJECT Eject key input PWR CONT Power supply control output Hi:on...
  • Page 28 CH-X460 TC9490FA (IC521) : DSP 1. Pin layout & Block diagram 32 TEZI Clock generator SBAD 1-bit Servo control RFRP RFZI ZDET RFCT Digital equalizer Address automatic circuit adjustment circuit BUS0 Data CLV servo slicer 16 k BUS1 SLCO Sync signal...
  • Page 29 CH-X460 2. Pin function (2/2) Symbol Function RFCT RFRP signal center level input pin. RFZI RFRP signal zero-cross input pin. RFRP RF ripple signal input pin. Focus error signal input pin. SBADTEI Sub-beam adder signal input pin. Tracking error input pin. Inputs when tracking servo is on.
  • Page 30 CH-X460 BA15218F-XE (IC101) : Dual operation amplifier 1. Pin layout OUT1 1 8 Vcc -IN1 2 7 OUT2 +IN1 3 6 -IN2 VEE 4 5 +IN2 2. Block diagram OTHER Q114 OUTPUT 1-30...
  • Page 31 CH-X460 BR24CO1AF-X-W(IC604):EP ROM 1.Terminal Layout 2.Block Diagrram VCC TEST SCL SDA 1,024bit EEPROM Array 8 VCC BR24C01AF 8bit 7bit Slave Word Data Address 7 TEST 7bit Decoder Address Register Register START STOP 6 SCL Control logic High Voltage Gen. Vcc level detect 5 SDA 3.Pin Function...
  • Page 32 CH-X460 FAN8037 (IC581) : CD driver 1. Pin layout & Block diagram 48 47 46 45 44 43 42 41 40 39 38 37 STAND BY T.S.D ALL MUTE POWER SAVE 13 14 15 16 17 18 19 20 21 22 23 24 2.
  • Page 33 CH-X460 HD74HC126FP-X (IC651) : Buffer 1.Terminal layout 3.Pin function Input Output Note: H : High L : Low X : H and L Z : H.L.X 2.Block diagram Output Input Output Sample as Load Circuit 1 Output Sample as Load Circuit 1...
  • Page 34 CH-X460 IC-PST9333U-X (IC602) : Reset IC 1. Pin layout VOUT 2. Block diagram VOUT 3. Pin function Pin No. Function Symbol Non connect GND terminal VOUT Reset signal output terminal Power supply terminal 1-34...
  • Page 35 CH-X460 TA2147F-X (IC501) : RF amp 1. Pin layout & Block diagram 10 pF 30 k 40 k 1.3 V 180 k 40 pF 40 k 60 A 10 pF 2. Pin function Symbol Function 3.3V power supply pin Main-beam amp input pin...
  • Page 36 CH-X460 VICTOR COMPANY OF JAPAN, LIMITED MOBILE ELECTRONICS DIVISION PERSONAL & MOBILE NETWORK BUSINESS UNIT. 10-1,1Chome,Ohwatari-machi,Maebashi-city,371-8543,Japan 200202 (No.49697)