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JVC KD-S641 Service Manual
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JVC KD-S641 Service Manual

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SERVICE MANUAL
01
2003
49769
1
Important Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
2
Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
3
Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23
4
Description of major ICs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27
CD RECEIVER
KD-S641
LOUD
SEL
DISP
TABLE OF CONTENTS
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD.
7
8
MO
9
10
11
RPT
12
RND
FM
CD
SSM
AM
MODE
SCM
COMPACT
DIGITAL AUDIO
Area Suffix
E -------- Continental Europe
No.49769
2003/01
KD-S641

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Summary of Contents for JVC KD-S641

  • Page 1 KD-S641 SERVICE MANUAL CD RECEIVER 49769 2003 KD-S641 LOUD DISP MODE COMPACT DIGITAL AUDIO Area Suffix E -------- Continental Europe TABLE OF CONTENTS Important Safety Precautions ............1-2 Disassembly method .

  • Page 2: Important Safety Precautions

    KD-S641 SECTION 1 Important Safety Precautions 1.1 Safety Precautions 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 KD-S641 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.

  • Page 4: Disassembly Method

    KD-S641 SECTION 2 Disassembly method 2.1 Main body 2.1.1 Removing the front panel assembly Front panel assembly (See Fig.1) (1) Push the detach button in the lower right part of the front panel assembly and remove the front panel assembly in the direction of the arrow.
  • Page 5 KD-S641 2.1.3 Removing the heat sink (See Fig.4) (1) Remove the two screws B and two screws C on the left side of the main body. Heat sink Fig.4 2.1.4 Removing the bottom cover (See Figs.5 and 6) • Prior to performing the following procedure, remove the front Joint c panel assembly, front chassis assembly and heat sink.
  • Page 6 KD-S641 2.1.6 Removing the main board Main board assembly (See Fig.8) • Prior to performing the following procedure, remove the front panel assembly, front chassis assembly, heat sink, bottom cover and rear bracket (1) Remove the two screws G attaching the main board.
  • Page 7 KD-S641 2.1.8 Removing the front board (See Figs.10 to 12) • Prior to performing 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.
  • Page 8 KD-S641 2.2 CD Mechanism Assembly 2.2.1 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.
  • Page 9 KD-S641 2.2.2 Removing the connector board Wires (See Figs.3 to 5) CAUTION: Before disconnecting the flexible wire from the pickup, solder the short-circuit point on the pickup. No observance of this in- struction may cause damage of the pickup. (1) Remove the screw B fixing the connector board.
  • Page 10 KD-S641 2.2.3 Removing the 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. DET switch Connector board Pickup Fig.6...
  • Page 11 KD-S641 2.2.4 Removing the chassis unit (See Figs.8 and 9) • Prior to performing the following procedure, remove the top Chassis unit cover and connector board. Suspension spring (L) Suspension spring (R) (1) Remove the two suspension springs (L) and (R) attaching the chassis unit to the frame.
  • Page 12 KD-S641 2.2.5 Removing the clamper assembly (See Figs.10 and 11) • Prior to performing the following procedure, remove the top cover. (1) Remove the clamper arm spring. Clamper arm spring (2) Move the clamper assembly in the direction of the arrow to release the two joints d.
  • Page 13 KD-S641 2.2.6 Removing the loading / feed motor assembly (See Figs.12 and 13) • Prior to performing the following procedure, remove the top cover, connector board and chassis unit. (1) Remove 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.
  • Page 14 KD-S641 2.2.7 Removing the pickup unit 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 D and pull out the pu. shaft holder from Part e the pu.
  • Page 15 KD-S641 2.2.9 Removing the trigger arm Joint k (See Figs.19 and 20) • Prior to performing the following procedure, remove the top cover, connector board and clamper unit. (1) Turn the trigger arm in the direction of the arrow to release Trigger arm the joint k and pull out upward.
  • Page 16 KD-S641 2.2.11 Removing the mode sw. / select lock arm Link plate Joint t (See Figs.22 and 23) Mode sw. • Prior to performing the following procedure, remove the top plate assembly. Select lock arm (1) Bring up the mode sw. to release from the link plate (joint t) and turn in the direction of the arrow to release the joint u.
  • Page 17 KD-S641 2.2.12 Reassembling the mode sw. / select lock arm Select lock arm spring (See Figs.24 to 26) Hook w REFERENCE: Reverse the above removing procedure. Joint v (1) Reattach the select lock arm spring to the top plate and set...
  • Page 18 KD-S641 2.2.13 Removing the select arm R / link plate Joint c' Link plate Joint r (See Figs.27 and 28) Select arm R Joint b' • Prior to performing the following procedure, remove the top plate assembly. (1) Bring up the select arm R to release from the link plate...
  • Page 19 KD-S641 2.2.15 Removing the loading roller assembly Loading roller assembly (See Figs.31 to 33) • Prior to performing the following procedure, remove the Roller guide clamper assembly and top plate assembly. spring (1) Push inward the loading roller assembly on the gear side and detach it upward from the slot of the joint g' of the lock arm rivet assembly.
  • Page 20 KD-S641 2.2.16 Removing the loading gear 5, 6 and 7 Loading gear bracket (See Figs.35 and 36) • Prior to performing the following procedure, remove the top Loading gear 6 cover, chassis unit, pickup unit and top plate assembly. (1) Remove the screw K attaching the loading gear bracket.
  • Page 21 KD-S641 2.2.17 Removing the gears Joint p' (See Figs.37 to 40) • Prior to performing the following procedure, remove the top Change plate cover, chassis unit, top plate assembly and pickup unit. rivet assembly • Pull out the loading gear 3. (See Fig.35.) (1) Pull out the feed gear.
  • Page 22 KD-S641 2.2.18 Removing the turn table / spindle motor Turn table (See Figs.41 and 42) • Prior to performing the following 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.

  • Page 23: Adjustment

    6. Digital tester AM (MW) 522kHz ~ 1620 kHz 7. Tracking offset meter (LW) 144kHz ~ 279 kHz 8. Test Disc JVC : CTS-1000 9. Extension cable for check Dummy load EXTSH002-22P × 1 Exclusive dummy load should be used for AM, and FM. For FM dummy load, there is a loss of 6dB between SSG output and antenna input.
  • Page 24 KD-S641 3.2 Troubleshooting 3.2.1 Feed section Is the voltage output at Is the wiring for IC541 Is 5V present at IC581 Check CD 9V IC541 pin 4 is 5V or 0V? 1 ~ 14 correct? pin 6? and 5V. Check the vicinity of IC521.
  • Page 25 KD-S641 3.2.5 Signal processing section No sound from either Compare the L-ch and R-ch Is the sound output from channel. to locate the defective point. both channels (L, R)? Check the vicinity of the Normal Is 9V present at IC101 pin Q981 audio power supply.
  • Page 26 KD-S641 3.3 Maintenance of laser pickup 3.4 Replacement of laser pickup (1) Cleaning the pick up lens Before you replace the pick up, please try to clean the lens Turn off the power switch and,disconnect the power cord with a alcohol soaked cotton swab.

  • Page 27: Description Of Major Ics

    KD-S641 SECTION 4 Description of major ICs 4.1 HA13164A (IC901) : Regulator • Pin layout 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 • Block diagram 100u 0.1u BATT.DET OUT ANT OUT Surge Protector 0.1u...
  • Page 28 KD-S641 4.2 AN8806SB-W (IC501) : RF & amp. • Pin layout PD 1 36 PDAC 35 PDBD LD 2 34 PDF LDON 3 33 PDE LDP 4 32 PDER VCC 5 31 PDFR RF- 6 RF OUT 7 30 TBAL...
  • Page 29 KD-S641 • Pin function Pin No. Symbol Function APC amp input terminal APC amp output terminal LD ON APC ON/OFF control terminal Connect to ground Power supply Inverse input pin for RF amp RF OUT RFamp output RF IN RF input C.AGC...
  • Page 30 KD-S641 4.3 TEA6320T-X (IC301) : E.volume • Pin layout OUTRR OUTLR OUTRF OUTLF MUTE Vref CD-CH TAPE TUNER • Block diagram VOLUME 2 MUTE 0 to 55 dB FUNCTION BALANCE ZERO CROSS FENDER REAR POWER DETECTOR SUPPLY VOLUME 1 BASS...
  • Page 31 KD-S641 4.4 NJM4565M-WE (IC151) : CD L.P.F. • Pin layout & Block diagram A OUTPUT B OUTPUT A INPUT A INPUT B INPUT B INPUT (No.49769)1-31...
  • Page 32 KD-S641 4.5 JES01-9B42 (IC801) : Main micon • Pin layout • Pin function Pin No. Symbol Function X'tal oscillator conection terminal TEST2 J BUS SI Non connect J BUS SO Non connect J BUS SCK Non connect J BUS I/O CONT...
  • Page 33 KD-S641 Pin No. Symbol Function RELAY Power supply control terminal BLKCL Sub code/ Block signal input terminal BEEP Non connect Detection switch 1 Detection switch 2 Pnael switch detection REST Rest switch input terminal FLOCK Focus signal input terminal TLOCK...
  • Page 34 KD-S641 4.6 LA4743K (IC321) : Power amp. • Block diagram 2200 F 0.022 F Vcc 1/2 Vcc 3/4 IN 1 OUT 1+ 0.22 F OUT 1- PWR GND1 Protective circuit OUT 2+ IN 2 OUT 2- 0.22 F PWR GND2...
  • Page 35 KD-S641 • Pin layout • Pin function Pin No. Symbol Function Header of IC Power GND Outpur(-) for front Rch STDBY Stand by input Output (+) for front Rch Power input Output (-) for rear Rch Power GND Output (+) for rear Rch...
  • Page 36 KD-S641 4.7 LA6589H-X (IC541) : BTL driver • Pin layout & Block diagram VIN1-A VIN1 VIN1_SW H : OP-AMP_A L : OP-AMP_B VIN1+A VIN1-B VCCP1 VIN1+B VO1+ S-GND Signal system VO1- VIN1-SW It is ON/OFF as for all outputs. H : ON...
  • Page 37 KD-S641 • Pin function Pin No. Symbol Function VIN1-A CH1 input AMP_A reversing input VIN1+A CH1 input AMP_A non-reversing input VCCP1 CH1 and CH2 power steps power supply VO1+ CH1 Output terminal (+) VO1- CH1 Output terminal (-) VO2+ CH2 Output terminal (+)
  • Page 38 KD-S641 4.8 MN6627482WA (IC561) : DSP & DAC • Pin layout 20 ~ 41 ~ • Block diagram AVSS1 LRCKIN(MSEL) 8TIMES AVDD1 BCLK(SSEL) DIGITAL OVER SAMPUNC OUTR SRDATAIN DEEMPHSIS 1BIT DIGITAL FILTER (PSEL) LOGIC IOSEL CLVS BLKCK OUTL CLDCK SBCK...
  • Page 39 KD-S641 • Pin function Pin No. Symbol Function Pin No. Symbol Function WVEL Not used BCLK Not used RF signal input LRCK Not used IREF Reference current input pin SRDATA Not used Bias pin for DSL DVDD1 Power supply (Digital)
  • Page 40 KD-S641 4.9 LC75823W (IC601) : LCD driver • Pin Layout 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 •...
  • Page 41 KD-S641 (No.49769)1-41...
  • Page 42 KD-S641 VICTOR COMPANY OF JAPAN, LIMITED AV & MULTIMEDIA COMPANY 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan (No.49769) Printed in Japan 200301WPC...