JVC CH-X470RF J Service Manual Download Page 26 | Manualshive

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CH-X470RF

1-26

Signal processing section

No sound from either

channel.

Is 9V present at IC101 pin

(8)?

Compare the L-ch and

R-ch to locate the

defective point.

Is the sound output from
both channels (L, R)?

Check the vicinity of the

Q981 audio power

supply.

NO

NO

NO

NO

YES

YES

YES

YES

YES

Check IC521 and its

peripheral circuits.

Is the audio signal

(including sampling output

components) output to

IC521 pins ^and | during

Is the audio signal output

at IC101 pins 1

and7during playback?

NO

Check IC101 and its

peripheral circuits

Check the muting circuit.

Normal

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Summary of Contents for CH-X470RF J

Page 1: ...ntents Safety precaution Preventing static electricity Disassembly method Forced eject procedures 1 2 1 3 1 4 1 20 Trouble shooting Flow of functional operation until TOC read Description of major ICs 1 21 1 23 1 27 J Northern America KS RF50 CH X470 CH X470RF is a combination of CH X470 and KS RF50 KS RF50 is a combination of Remote control and the RF unit ...

Page 2: ...eft 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 case of an adjustment or operation check ...

Page 3: ...o not use a tester to check the condition of the laser diode in the optical pickup The tester s 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 flexible cable using nippers etc after replacing the optical pickup ...

Page 4: ...B at the triangle 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 raise upward to remove the bottom cover Unhook the four catches located on both sides of the f...

Page 5: ...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 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 ...

Page 6: ...sembly Disconnect position motor wire connector CN504 from the main board 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 Removing the main PCB assembly See Fig 1...

Page 7: ...her 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 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 a...

Page 8: ...slider is shifted to the outermost position Remove the E washer 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 remove the upper rod from the top plate 1 2 3 To...

Page 9: ...e 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 unit 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 ...

Page 10: ... gear Move the middle gear Move 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 pickup assembly See Fig 23 to 26 To reattach the mechanism board connect the pickup flexibl...

Page 11: ...wo screws U retaining the chassis L and R assemblies Slide the chassis L assembly toward the front and detach 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 assembly ...

Page 12: ... middle position and secure it with the screws Q 1 2 3 4 Mounting the 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 board using screws CAUTION Pickup assembly A...

Page 13: ...ide 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 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 Shif...

Page 14: ... is inserted into the notch of the chassis R assembly by sliding it from the front side After engaging secure with the two screws U Attach the tension spring between the lifter unit and the chassis 1 2 3 4 Connection of the chassis L assembly and chassis R assembly See Fig 38 to 40 Lower Rod Notch Attached Slide to engage Combine with R chassis Set last lifter side Proper orientation Tension sprin...

Page 15: ...o p s and r are correctly positioned When mounting section s set it so that section t of the lifter unit is pinched by the bending section of the top plate Secure the top plate with six fixing screws K 1 2 3 Mounting the top plate See Fig 41 to 44 n o p s r Upper rod Section t Lifter Unit Point r Expanded view of mounting s m Fig 41 Fig 42 Fig 43 Fig 44 K K K Top plate l ...

Page 16: ...t Position the unit with the front side facing down then mount the rear slider Check that the u v and w positions are correctly mounted as shown in Fig 46 Rotate the third gear in the direction of the arrow counterclockwise until the lifter unit is at the top position 1 2 3 4 5 Mounting the front slider and rear slider See Fig 45 and 46 Fig 45 1 Fig 45 Fig 45 2 Stud E Washer Front slider Check aft...

Page 17: ...unting the sensor board assembly See Fig 47 Rotate the third gear clockwise until section x of the front slider and the third hole from the right are lined up Be sure to set properly If incorrectly set the switches on the board assembly may be damaged After they are correctly positioned mount the main board assembly 1 2 Mounting the main PC board assembly See Fig 48 Sensor assembly fixing screws x...

Page 18: ...the wire from connector CN501 on the mechanism board Remove the three fixing screws N from the round holes on the chassis R assembly to remove the traverse mechanism board assembly Remove the pickup shaft holder fixing screw P to remove the pickup assembly 1 2 3 4 5 6 7 8 9 10 11 Pickup replacement procedure See Fig 49 to 55 When replacing the pickup be sure to apply countermeasures against static...

Page 19: ...unting the lifter bracket after replacing the pickup shift the lifter unit lever approx 30 mm towards the inside then mount the lifter bracket 12 13 Shift approx 30 mm Shift approx 30 mm Pickup Feed slide shaft Rack arm R Shaft Holder Middle gear P Lifter unit lever Enlarged diagram Q Fig 53 Fig 54 Fig 55 Pickup Middle gear Chassis ...

Page 20: ...ck the disc Remove the dampers and the top cover to take out the mechanism Remove the item s causing the disc jam through the clearance at the top of the lifter Remove the lifter bracket L and return the tray to the magazine RESET Press EJECT for 3 sec Completed YES YES YES NO NO NO Remove the bottom cover Is the disc set in the playing position Are trays stored in the magazine Check visually Impr...

Page 21: ...mbly E3 Tray motor error Trays cannot be opened or closed when exchanging or ejecting discs Does the tray move when changing or ejecting discs YES 5 NO 6 5Check that TRAY OUT SW S602 and TRAY IN SW S603 function correctly E4 Pick returning error Does the feed pickup unit return to the inner area of the disc when ejecting YES 7 NO 8 9 7 Check the rest switch 8If the feed gear is rotated check the f...

Page 22: ...ust mode Wait position time out E1 02 00 36 Position motor inoperative Wait position time out E1 02 00 33 Other fault Play position time out E1 02 00 32 Position not stable in fine adjust mode Play position time out E1 02 00 31 Position motor inoperative Play position time out E1 02 00 28 Other fault Wait position time out E1 02 00 27 Position not stable in fine adjust mode Wait position time out ...

Page 23: ... to the inner area of the disc When the laser diode correctly emits No disc display Rough Servo Mode CLV Servo Mode ProgramArea CLV Servo Mode Lead In Area Digital 0 RF signal Focus Servo Loop ON TERMINAL Microprocessor commands Microprocessor commands Tracking Servo Loop ON Servo CLV Rough Servo Acceler Acceleration ation Acceleration Microprocessor commands Spindle motor 20 FMO TC9462 CN502 or C...

Page 24: ...on motor does not function The tray motor goes forward and back several times Check the connections to the receiver or the circuits in the vicinity of IC651 Check the linear position sensor VR601 Check the wiring of the CD 9 V power supply position motor Check the TRAY IN and TRAY OUT switches Exchange discs then check whether or not the feed motor moves Set from the STOP to PLAY mode then check t...

Page 25: ... pins H K Check the pickup and its connections NO YES YES Does the S search waveform appear at IC581 pins H and I Is the disk rotated Does the RF signal appear at TP1 Is 4V present between IC581 pins 1 and 2 Check the spindle motor and its wiring Is 4V present at IC521 pin x Check the vicinity of IC581 Check IC501 and IC521 YES NO NO NO NO NO YES YES YES Check the circuits in the vicinity of IC501...

Page 26: ...ut from both channels L R Check the vicinity of the Q981 audio power supply NO NO NO NO YES YES YES YES YES Check IC521 and its peripheral circuits Is the audio signal including sampling output components output to IC521 pins and during Is the audio signal output at IC101 pins 1 and7during playback NO Check IC101 and its peripheral circuits Check the muting circuit Normal ...

Page 27: ...SI chip enable CD LSI data 0 open drain CD LSI data 1 open drain CD LSI data 2 open drain CD LSI data 3 open drain Unused output port 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 CD RW NC NC MAG IN TRAY OUT TRAY IN REST DISC SEL EMPH NC OE SHOCK SW SHOCK NC A MUTE MUTE PWR STAGE STAGE2 EPROM CLR RESET REMOCON PWR DET PWR SW...

Page 28: ...ed input pin for PLL RF amp Output pin for PLL LPF amp PLL only VREF pin VCO filter pin Analog GND pin DAC output pin for data slice level generation RF signal input pin Analog 3 3V power supply voltage pin BCK LRCK AOUT DOUT IPF VDD3 VSS3 SBOK CLCK DATA SFSY SBSY HSO UHSO PVDD3 PDO TMAX LPFN LPFO PVREF VCOF AVSS3 SLCO RFI AVSS3 No Symbol I O Function 49 DV DV SS3 VSS5 VDD5 DD3 DD3 RO V DD3 V SS3 ...

Page 29: ...pin Digital 3 3V power supply voltage pin Test input pin System clock oscillator GND pin System clock oscillator input pin System clock oscillator output pin System clock oscillator 3 3V power supply voltage pin DA converter GND pin R channel data foward output pin DA converter 3 3V power supply pin Reference voltage pin L channel data forward output pin DC converter GND pin 1 bit DA converter zer...

Page 30: ...5 IN2 OUT1 1 IN1 2 IN1 3 VEE 4 BA15218F XE IC101 Dual operation amplifier 1 Pin layout 2 Block diagram Q19 Q17 Q16 OTHER CH R9 R6 R8 R7 R5 R4 R3 R2 R1 D1 C1 Q18 Q13 Q11 Q8 Q5 Vcc VEE OUTPUT IN IN Q1 Q3 Q4 Q2 C2 Q9 Q6 Q7 Q10 Q12 Q14 Q15 Q114 ...

Page 31: ... Vcc level detect START STOP ACK VCC TEST SCL SDA BR24C01AF A0 A1 A2 GND BR24CO1AF X W IC604 EP ROM 2 Block Diagrram 1 Terminal Layout 3 Pin Function An open drain output requires a pull up resistor Symbol VCC GND A1 A2 A3 SCL SDA TEST I O I I I O I Function Puwer Supply Ground OV Slaves Address Set Pin Serial Clock Input Slaves and Word Address Serial Data Input Serial Data Output Ground ...

Page 32: ...everse input CH7 motor speed control Stand by Power save All mute Power supply voltage CH7 drive output IN2 IN2 OUT2 IN3 IN3 OUT3 IN4 IN4 OUT4 CTL1 FWD1 REV1 CTL2 FWD2 REV2 SGND FWD3 REV3 CTL3 SB PS MUTE PVCC2 DO7 Pin No Symbol I O Function 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 O O O O O O O O O O O O O I O I I I I O CH7 drive output CH6 drive output CH6 drive out...

Page 33: ... Sample as Load Circuit 1 Sample as Load Circuit 1 Sample as Load Circuit 1 1k 1k S1 CL Input Output C L H H A X L H Y Z H L 1 2 3 4 5 6 7 14 13 12 11 10 9 8 HD74HC126FP X IC651 Buffer 1 Terminal layout 2 Block diagram 3 Pin function 1C 1A 1Y 2C 2A 2Y GND 3Y 3A 3C 4Y 4A 4C Vcc Note H High L Low X H and L Z H L X ...

Page 34: ... GND 1 NC 1 2 4 3 GND NC GND Vcc VOUT IC PST9333U X IC602 Reset IC 1 Pin layout 2 Block diagram 3 Pin function Symbol NC GND VOUT Vcc Pin No 1 2 3 4 Function Non connect GND terminal Reset signal output terminal Power supply terminal ...

Page 35: ...iode amp input pin Laser diode amp output pin APC circuit ON OFF control signal laser diode control signal input or bottom peak detection frequency change pin Tracking error balance adjustment signal input pin Tracking error signal generation amp negative phase input pin Tracking error signal generation amp output pin RF signal peak detection output pin AGC FE TE amp gain change pin Reference volt...

Page 36: ...CH X470RF VICTOR COMPANY OF JAPAN LIMITED MOBILE ELECTRONICS DIVISION PERSONAL MOBILE NETWORK BUSINESS UNIT 10 1 1Chome Ohwatari machi Maebashi city 371 8543 Japan No 49668 200112 ...

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