JVC KD-S641 Service Manual Download Page 14

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KD-S641

1-14 (No.49769)

2.2.7

Removing the pickup unit
(See Figs.14 to 18)

• Prior to performing the following procedure, remove the top

cover, connector board and chassis unit.

(1) Remove the screw

and pull out the pu. shaft holder from

the pu. shaft.

(2) Remove the screw

attaching the feed sw. holder.

(3) Move the part

of the pickup unit upward with the pu. shaft

and the feed sw. holder, then release the joint

of the feed

sw. holder in the direction of the arrow. The joint

of the

pickup unit and the feed rack is released, and the feed sw.
holder comes off.

(4) Remove the pu. shaft from the pickup unit.
(5) Remove the screw

attaching the feed rack to the pickup

unit.

2.2.8

Reattaching the pickup unit
(See Figs.14 to 17)

(1) Reattach the feed rack to the pickup unit using the screw

(2) Reattach the feed sw. holder to the feed rack while setting

the joint

to the slot of the feed rack and setting the part f

of the feed rack to the switch of the feed sw. holder correct-
ly.

(3) As the feed sw. holder is temporarily attached to the pickup

unit, set to the gear of the joint

and to the bending part of

the chassis (joint

) at a time.

CAUTION:

Make sure that the part i on the underside of the feed
rack is certainly inserted to the slot j of the change lock
lever.

(4) Reattach the feed sw. holder using the screw

(5) Reattach the pu. shaft to the pickup unit. Reattach the pu.

shaft holder to the pu. shaft using the screw

Fig.14

Fig.15

Fig.16

Fig.17

Fig.18

Feed sw. holder

Joint g

Joint f

Part e

Pickup unit

Pu. shaft holder

Pu. shaft

Feed sw. holder

Part e

Pickup unit

Feed rack

Feed sw.
holder

Joint f

Pu. shaft
holder

Pu. shaft

Pickup unit

Joint h

Part i

Slot j

Joint g

Feed rack

Pickup unit

Joint f

Joint g

Feed rack

Pickup unit

Feed sw. holder

Summary of Contents for KD-S641

Page 1: ...41 CD RECEIVER 49769 2003 01 KD S641 TABLE OF CONTENTS 1 Important Safety Precautions 1 2 2 Disassembly method 1 4 3 Adjustment 1 23 4 Description of major ICs 1 27 COMPACT DIGITAL AUDIO SEL LOUD DISP SSM SCM MODE 7 9 10 12 RND 11 RPT 8 MO AM CD FM Area Suffix E Continental Europe ...

Page 2: ...utions 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 ...

Page 3: ...ode in the optical pickup The tester s 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 after replacing the optical pickup For specific details refer to the replacement procedure...

Page 4: ...2 1 2 Removing the front chassis assembly See Figs 2 and 3 Prior to performing the following procedure remove the front panel assembly 1 Remove the two screws A on the both sides of the main body 2 Release the two joints a and two joints b on both sides of the main body using a screwdriver and remove the front chassis assembly forward Fig 2 Fig 3 Front panel assembly Detach button Joint a Joint a ...

Page 5: ...wo joints c two joints d and joint e CAUTION Do not damage the main board when releasing the joint e us ing a screwdriver See Figs 5 and 6 Fig 5 Fig 6 2 1 5 Removing the rear bracket See Fig 7 Prior to performing the following procedure remove the front panel assembly front chassis assembly heat sink and bottom cover 1 Remove the three screws D three screws E and two screws F on the back of the bo...

Page 6: ... the two screws G attaching the main board 2 Disconnect the connector CN501 and remove the main board Fig 8 2 1 7 Removing the CD mechanism assembly See Fig 9 Prior to performing the following procedure remove the front panel assembly front chassis assembly heat sink bottom cover rear bracket and main board 1 Remove the three screws H Fig 9 Main board assembly G G CN501 H H CD mechanism assembly T...

Page 7: ...g the following procedure remove the front panel assembly 1 Remove the four screws J on the back side of the front pan el assembly 2 Release the eleven joints f 3 Take out the front board Fig 10 Fig 11 Fig 12 J J J Joint f Joint f Rear cover Front panel Joint f Joint f Joint f Front board ...

Page 8: ... 1 Removing the top cover See Figs 1 and 2 1 Remove the two screws A on the both side of the body 2 Lift the front side of the top cover and move the top cover backward to release the two joints a Fig 1 Fig 2 A A A Joints a Top cover Joints a Top cover ...

Page 9: ...nector board 2 Solder the short circuit point on the connector board 3 Disconnect the flexible wire from the pickup 4 Move the connector board in the direction of the arrow to release the two joints b 5 Unsolder the wire on the connector board if necessary CAUTION Unsolder the short circuit point after reassembling Fig 3 Fig 4 Fig 5 B Connector board Pickup Short circuit point Joints b Wires Picku...

Page 10: ... DET switch See Figs 6 and 7 1 Extend the two tabs c of the feed sw holder and pull out the switch 2 Unsolder the DET switch wire if necessary Fig 6 Fig 7 Connector board DET switch Pickup DET switch Tab c Tab c DET switch wire Feed sw holder ...

Page 11: ...ng the chassis unit to the frame CAUTION The shape of the suspension spring L and R are dif ferent Handle them with care When reassembling make sure that the three shafts on the underside of the chassis unit are inserted to the dampers certainly Fig 8 Fig 9 Suspension spring L Suspension spring L Suspension spring R Suspension spring R Chassis unit Frame Chassis unit Frame Shafts Shaft Damper Damp...

Page 12: ...procedure remove the top cover 1 Remove the clamper arm spring 2 Move the clamper assembly in the direction of the arrow to release the two joints d Fig 10 Fig 11 Clamper arm spring Chassis rivet assembly Joint d Joint d Clamper assembly Clamper arm spring Clamper assembly Joint d Joint d Chassis rivet assembly ...

Page 13: ...emove the screw C and move the loading feed motor as sembly in the direction of the arrow to remove it from the chassis rivet assembly 2 Disconnect the wire from the loading feed motor assembly if necessary CAUTION When reassembling connect the wire from the loading feed motor assembly to the flame as shown in Fig 12 Fig 12 Fig 13 Loading feed motor assembly Loading feed motor assembly C ...

Page 14: ...crew F 2 Reattach the feed sw holder to the feed rack while setting the joint g to the slot of the feed rack and setting the part f of the feed rack to the switch of the feed sw holder correct ly 3 As the feed sw holder is temporarily attached to the pickup unit set to the gear of the joint g and to the bending part of the chassis joint h at a time CAUTION Make sure that the part i on the undersid...

Page 15: ...t the slot of the chassis rivet assembly respectively and join the joint k at a time Fig 19 Fig 20 2 2 10 Removing the top plate assembly See Fig 21 Prior to performing the following procedure remove the top cover connector board chassis unit and clamper assembly 1 Remove the screw H 2 Move the top plate assembly in the direction of the arrow to release the two joints r 3 Unsolder the wire marked ...

Page 16: ...he direction of the arrow to release the joint u 2 Unsolder the wire of the mode sw marked s if necessary 3 Turn the select lock arm in the direction of the arrow to re lease the two joints v 4 The select lock arm spring comes off the select lock arm at the same time Fig 22 Fig 23 Mode sw Select lock arm Joint t Link plate Joint u s Top plate Top plate Select lock arm Select lock arm spring Select...

Page 17: ...x on the underside of the select lock arm and join the select lock arm to the slots joint v Turn the select lock arm as shown in the figure 3 Reattach the mode sw while setting the part t to the first peak of the link plate gear and join the joint u CAUTION When reattaching the mode sw check if the points y and z are correctly fitted and if each part operates properly Fig 24 Fig 25 Fig 26 Select l...

Page 18: ...igs 29 and 30 REFERENCE Reverse the above removing procedure 1 Reattach the link plate spring 2 Reattach the link plate to the link plate spring while joining them at joint d 3 Reattach the joint a of the select arm R to the first peak of the link plate while joining the two joints b with the slots Then turn the select arm R as shown in the figure The top plate is joined to the joint c CAUTION Whe...

Page 19: ...late 5 Extend the lock arm rivet assembly outward and release the joint j from the boss of the chassis rivet assembly The roller guide springs on both sides come off at the same time CAUTION When reassembling reattach the left and right roller guide springs to the lock arm rivet assembly before reat taching the lock arm rivet assembly to the chassis rivet assembly Make sure to fit the part k of th...

Page 20: ...ver chassis unit pickup unit and top plate assembly 1 Remove the screw K attaching the loading gear bracket The loading gear 6 and 7 come off the loading gear brack et 2 Pull out the loading gear 5 Fig 35 Fig 36 K Loading gear bracket Loading gear 6 Loading gear 5 Loading gear 3 K Loading gear bracket Loading gear 6 Loading gear 5 Loading gear 7 ...

Page 21: ...ff 7 Remove the loading gear 1 8 Move the change plate rivet assembly in the direction of the arrow to release from the three shafts of the chassis rivet assembly upward See Fig 38 9 Detach the loading gear plate rivet assembly from the shaft of the chassis rivet assembly upward while releasing the joint p See Figs 38 and 40 10 Pull out the loading gear 4 Fig 37 Fig 38 Fig 39 Fig 40 Slot m Slot m ...

Page 22: ...lowing procedure remove the top cover connector board chassis unit and clamper assembly 1 Remove the two screws L attaching the spindle motor as sembly through the slot of the turn table on top of the body 2 Unsolder the wire on the connector board if necessary Fig 41 Fig 42 L Turn table L Turn table Spindle motor ...

Page 23: ...ould be used for AM and 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 Treble volume lndication 0 Loudness OFF Frequency Band FM 87 5MHz 108 0MHz AM MW 522kHz 1620 kHz LW 144kHz 279 kHz The cardboard is cut in a suit...

Page 24: ...and 9 Check the pickup and its connections NO YES YES Does the S search waveform appear at IC561 pins 32 4V Is the disk rotated Does the RF signal appear at ARF TP Is 4V present between IC541 pins 6 and 7 Check the spindle motor and its wiring Is 4V present at IC561 pin 29 Check the vicinity of IC541 Check IC561 and IC901 YES NO NO NO NO NO YES YES YES Check the circuits in the vicinity of IC561 2...

Page 25: ...Check IC801 and its peripheral circuits Check IC301 and its peripheral circuits Is 9V present at IC101 pin 8 Is the sound output from both channels L R NO NO NO NO NO YES YES YES YES YES YES Is the audio signal including sampling output components output to IC801 pins 39 and 40 during playback Is the audio signal output at IC301 pins 1 and 32during playback Check the muting circuit Normal ...

Page 26: ...whole optical block do not touch the semi fixed resistor If the laser power is lower than the specified value the laser diode is almost worn out and the laser pickup should be replaced If the semi fixed resistor is adjusted while the pickup is functioning normally the la ser pickup may be damaged due to excessive current 3 4 Replacement of laser pickup Is RF output 1 0 0 35Vp p Replace it O K NO Y...

Page 27: ...tage is VCC 1 V when M or H level applied to CTRL pin 2 ANTOUT Output voltage is VCC 1 V when M or H level to CTRL pin and H level to ANT CTRL 3 ACCIN Connected to ACC 4 VDDOUT Regular 5 7V 5 SW5VOUT Output voltage is 5V when M or H level applied to CTRL pin 6 COMPOUT Output for ACC detector 7 ANT CTRL L ANT output OFF H ANT output ON 8 VCC Connected to VCC 9 BATT DET Low battery detect 10 AUDIO O...

Page 28: ... EA 12 CS BDO 13 BDO 14 CS BRT 15 OFTR 16 NRFDET 17 GND 18 36 PDAC 35 PDBD 34 PDF 33 PDE 32 PDER 31 PDFR 30 TBAL 29 FBAL 28 EF 27 EF OUT 26 TE 25 TE OUT 24 CROSS 23 TE BPF 22 VDET 21 LD OFF 20 VREF 19 ENV 30 24 25 26 23 22 1 4 3 33 32 34 31 36 35 13 14 15 16 20 2 21 6 29 7 28 27 8 9 10 17 11 12 19 ENV CURCUIT RF DET AGC EQ BDO OFTR VCBA VCBA VCBA VCBA ...

Page 29: ... BDO output pin 15 CS BRT I O A capacitor is connected to detect the lower envelope of RF signal 16 OFTR O Of track status signal output 17 NRFDET O RF detection signal output 18 GND Ground 19 ENV O Envelope output 20 VREF O Reference voltage output 21 LD OFF Connect to ground 22 VDET O Vibration detection signal output 23 TE BPF I Input pin of tracking error through BPF 24 CROSS O Tracking error ...

Page 30: ...eft front 5 TL I Treble control capacitor left channel or input from an external equalizer 6 B2L Bass control capacitor left channel or output to an external equalizer 7 B1L Bass control capacitor left channel 8 IVL I Input volume 1 left control part 9 ILL I Input loudness left control part 10 QSL O Output source selector left channel 11 IDL Not used 12 MUTE Not used 13 ICL I Input C left source 1...

Page 31: ...KD S641 No 49769 1 31 4 4 NJM4565M WE IC151 CD L P F Pin layout Block diagram 8 7 6 5 4 3 2 1 V B OUTPUT B INPUT B INPUT A INPUT A INPUT A OUTPUT V ...

Page 32: ...or LCD driver 15 FM ILLUMI Non connect 16 AM ILLUMI Non connect 17 CD ILLUMI Non connect 18 DIMMER OUT Non connect 19 NC Non connect 20 MOTOR SEL Loading motor signal select terminal 21 23 NC Non connect 24 KS2 Open 25 KS1 Open 26 KS0 Open 27 DETACH Front panel detach detectionsignal input 28 K2 Non connect 29 K1 Open 30 K0 Open 31 Vdd Power supply 32 LM Loading motor control terminal 33 CD LSI RE...

Page 33: ...T Non connect 57 BAND FM AM band select terminal 58 MONO FM mono control signal output termianl 59 IFRQ AGC FA auto serch IF request output 60 MUTE Mute switch 61 LEVEL Non connect 62 S METER S meter input terminal 63 KEY CHANGE AD key select terminal 64 KEY2 Key AD input terminal 2 65 KEY1 Key AD input terminal 1 66 KEY0 Key AD input terminal 0 67 P SAVE1 Power save 1 detection input terminal 68 ...

Page 34: ... Vcc 1 2 Vcc 3 4 OUT 1 OUT 1 PWR GND1 OUT 2 OUT 2 PWR GND2 R F IN 3 IN 4 PRE GND ON TIME C Muting ON Time Control Circuit Protective circuit Protective circuit Mute circuit Ripple Filter Stand by Switch N C 0 22 F 2200 F 0 022 F 0 22 F TAB 5V ST ON 47 F 0 22 F 0 22 F 22 F Mute 10K 3 3 F OUT 3 OUT 3 Low Level Mute ON PWR GND3 OUT 4 OUT 4 PWR GND4 ...

Page 35: ...t for front Rch 6 VP1 Power input 7 RR Output for rear Rch 8 GND Power GND 9 RR Output for rear Rch 10 RIPPLE Ripple filter 11 RRIN Rear Rch input 12 FRIN Front Rch input 13 SGND Signal GND 14 FLIN Front Lch input 15 RLIN Rear Lch input 16 ONTIME Power on time control 17 RL Output for rear Lch 18 GND Power GND 19 RL Output for rear Lch 20 VP3 Power input 21 FL Output for front 22 MUTE Muting contr...

Page 36: ...VIN1 B VIN1 B S GND VIN1 SW MUTE VREF_IN FR VCC_S REG OUT REG_IN VIN2G VIN2 VIN3G VIN3 28 27 26 25 24 23 22 FR 21 20 19 18 17 16 15 Level shift Level shift H L VIN1_SW 33k 11k 33k 33k 11k 11k Signal system GND Power system GND Power system GND Signal system power supply 5VREG PNPTr External It is ON OFF as for all outputs H ON L OFF H OP AMP_A L OP AMP_B MUTE Level shift Level shift 33k 11k ...

Page 37: ... VO4 CH4 Output terminal 11 VO4 CH4 Output terminal 12 VCCP2 CH3 and CH4 power steps power supply 13 VIN4 CH4 Input terminal 14 VIN4G CH4 Input terminal For gain adjustment 15 VIN3 CH3 Input terminal 16 VIN3G CH3 Input terminal For gain adjustment 17 VIN2 CH2 Input terminal 18 VIN2G CH2 Input terminal For gain adjustment 19 REGIN External PNP transistor base connection 20 REG OUT 5VREG output term...

Page 38: ... PLL VCO AVDD2 SUB CODE BUFFER SSEL SQCK SUBQ AVDD2 CLVS CRC BLKCK CLDCK SBCK SUBC DEMPH RESY FLAG6 RESY EFM DEMODULATION SUBCODE DEMODULATION SYNC INTERPOLATION 16k SRAM CIRC ERROR CORRECTION DEINTERLEVE LRCKIN MSEL BCLK SSEL SRDATAIN PSEL IOSEL DIGITAL DEEMPHSIS 8TIMES OVER SAMPUNC DIGITAL FILTER 1BIT DAC LOGIC S PEM R PEM L DIGITAL AUDIO INTERFASE DIGITAL AUDIO INTERFASE INTER POLATION SOFT MUT...

Page 39: ...or signal input Analog input 33 TE I Tracking error signal input Analog input 34 RF ENV I RF envelope signal input Analog input 35 VDET I Vibration detect signal input H detect 36 OFT I Off track signal input H off track 37 TRCRS I Track cross signal input 38 RFDET I RF detect signal input L detect 39 BDO I BDO input pin L detect 40 LDON O Laser ON signal output H on 41 PLLF2 Not used 42 TOFS O Tr...

Page 40: ...e externally Must be connected to VDD1 when a 1 2 bias drive scheme is used 60 Vss Power supply connection Connect to GND 61 OSC I O Oscillator connection An oscillator circuit is formed by connecting an external resistor and capacitor at this pin 62 CE I Serial data interface connection to the controller CE Chip enable 63 CL I Serial data interface connection to the controller CL Sync clock 64 DI...

Page 41: ...KD S641 No 49769 1 41 ...

Page 42: ... No 49769 AV MULTIMEDIA COMPANY 10 1 1chome Ohwatari machi Maebashi city 371 8543 Japan VICTOR COMPANY OF JAPAN LIMITED 200301WPC Printed in Japan KD S641 ...

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