JVC KD-S895 Service Manual Download Page 5

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KD-S895

(No.49798)1-5

2.1.3 Removing the heat sink

(See Fig.5)

(1) Remove the two screws

and two screws

on the left

side of the main body.

Fig.5

2.1.4 Removing the bottom cover

(See Figs.6 and 7)

• Prior to performing the following procedure, remove the front

panel assembly, front chassis assembly and heat sink.

(1) Turn over the main body, and release the two joints

, two

joints

and joint

CAUTION:

Do not damage the main board when releasing the joint

using

a screwdriver. (See Figs.6 and 7)

Fig.6

Fig.7

Heat sink

Joint

Bottom cover

Joint

Bottom cover

Summary of Contents for KD-S895

Page 1: ...AN LTD No 49798 2003 03 KD S895 CD RECEIVER 49798 2003 03 KD S895 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 SOUND VOL VOL SOURCE R F U D ATT Area Suffix U Other Areas ...

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: ... 4 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 3 Release the two joints c on the bottom side of the main body and remove the front chassis assembly in the direc tion of the arrow Fig 2 Fig 3 Fig 4 Front panel assembly Detach button ...

Page 5: ...Prior to performing the following procedure remove the front panel assembly front chassis assembly and heat sink 1 Turn over the main body and release the two joints d two joints e and joint f CAUTION Do not damage the main board when releasing the joint f using a screwdriver See Figs 6 and 7 Fig 6 Fig 7 B C Heat sink Joint d Joint e Joint f Bottom cover Joint e Joint d Joint f Bottom cover ...

Page 6: ...orming 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 2 Disconnect the connector CN501 and remove the main board Fig 9 2 1 7 Removing the CD mechanism assembly See Fig 10 Prior to performing the following procedure remove the front panel assembly front chassis assembly heat si...

Page 7: ...re remove the front panel assembly 1 Remove the four screws J on the back side of the front pan el assembly 2 Release the fourteen joints g 3 Release the joint h and take out the front board Fig 11 Fig 12 Fig 13 J J J Joint g Joint g Rear cover Front panel Joint g Joint g Joint g Front board Joint h Front panel ...

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: ...ve 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 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 531kHz 1602 kHz The cardboard is cut in a suitable ...

Page 24: ...n remains closed Tracking loop closed RF signal eye pattern opens TOC read out Jump to the first track Play When the laser diode correctly emits Microprocessor commands SEL TC94A14FA 38 LD CN501 15 No disc display When the disc correctly rotates Microprocessor commands DMO TC94A14FA 41 Spindle motor IC501 7 Tracking Servo Loop ON RF signal Rough Servo Mode CLV Servo Mode Program Area CLV Servo Mod...

Page 25: ...m appear at IC501 pins 8 and 9 Check the circuits in the vicinity of IC501 pins 8 9 and 15 Check the pickup and its connections NO NO NO NO YES YES YES YES YES Is the disk rotated Does the RF signal appear at RF test point Is the RF waveform at RF test point distorted Proceed to the Tracking section Is 4V present at IC501 pins 6 and 7 Check the spindle motor and its wiring Check the circuits in th...

Page 26: ...e 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 NO YES O K T...

Page 27: ...N I Chip select 7 CCLK I Control data input terminal 8 CDTI I Control data input terminal 9 AOUTR O Rch negative analog output terminal 10 AOUTR O Rch positive analog output terminal 11 AOUTL O Lch negative analog output terminal 12 AOUTL O Lch positive analog output terminal 13 VSS Connect to ground 14 VDD Power supply terminal 15 DZFR O Rch data zero input detection terminal 16 DZFL O Lch data z...

Page 28: ...8 4 2 LA47505 IC301 Power amp Block diagram Muting On Time Control Circuit protective circuit Mute circuit Protective circuit Ripple Filter Stand by Switch 11 16 14 13 25 15 10 4 1 12 22 17 19 18 21 23 24 2 3 5 8 7 9 20 6 ...

Page 29: ... OUTFR Output for front Rch 6 Vcc1 2 Power input 7 OUTRR Output for rear Rch 8 GND2 Power GND 9 OUTRR Output for rear Rch 10 VREF Ripple filter 11 INRR Rear Rch input 12 INFR Front Rch input 13 SGND Signal GND 14 INFL Front Lch input 15 INRL Rear Lch input 16 ONTIME Power on time control 17 OUTRL Output for rear Lch 18 GND3 Power GND 19 OUTRL Output for rear Lch 20 Vcc3 4 Power input 21 OUTFL Outp...

Page 30: ...D VIN1 SW MUTE VREFIN VCCS 3 3VREG REGIN VIN2G VIN2 VIN3G VIN3 FR VIN1 A VIN1 A VCCP1 VO VO VO2 VO2 VO3 VO3 VO4 VO4 VCCP2 VIN4 VIN4G FR H L VIN1_SW H OP AMP_A L OP AMP_B 33k 11k Signal system power supply All outputs ON OFF H ON L OFF MUTE Level shift Level shift Power system GND Signal system power supply 3 3VREG External PTP Tr Power system GND Level shift Level shift 33k 11k 11k 33k 33k 11k ...

Page 31: ...r channel 4 14 VIN4G Input pin for channel 4 for gain adjustment 15 VIN3 Input pin for channel 3 16 VIN3G Input pin for channel 3 for gain adjustment 17 VIN2 Input pin for channel 2 18 VIN2G Input pin for channel 2 for gain adjustment 19 REGIN External PNP transistor base connection 20 3 3VREG 3 3VREG output pin external PNP transistor collector connection 21 VCCS Signal system GND 22 VREFIN Refer...

Page 32: ...CC Connected to car BACKUP Power supply 10 ANT Output When Mode 2 pin is H ANT output is Vcc 1 0V Io 300mA 11 MODE2 L ANT Output OFF and H ANT Output ON 12 BATT DET NPN Transistor open collector Output When battery is lower then 9V L 13 Audio Output When Mode 1 pin is M H Audio output is 9V Io 500mA min 14 ILM AJ ILM Illumination Output adjustable pin 15 ILM Illumination Output When Mode 1 pin is ...

Page 33: ...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 34: ...F25 X IC461 Regulator Pin layout Block diagram 4 10 NJU7241F33 X IC471 Voltage regulator 8 7 6 5 4 3 2 1 V B OUTPUT B INPUT B INPUT A INPUT A INPUT A OUTPUT V GND 1 VIN 2 VOUT 3 5 STB 4 NC Short protect 3 VOUT 1 GND Vref VIN 2 STB 5 GND 1 1 2 3 5 4 PIN FUNCTION 1 GND 2 VIN 3 VOUT 4 NC 5 STB ...

Page 35: ...RT Vdd Vcc Pin No Symbol I O Function Pin No Symbol I O Function 1 XOUT O Crystal oscillator pin 13 IFC I IF signal input 2 OSC Non connect 14 VDD Power pins for digital block 3 CE I Chip enable input 15 FMIN I FM band local signal input 4 DI I Serial data input 16 AMIN I AM band local signal input 5 CK I Clock input 17 DGND Connect to GND for digital circuit 6 DOUT O Serial data output 18 FMCP O ...

Page 36: ...0k 3k 180k 240k 240k 15pF 15pF 40pF 40pF 10pF 60k 60k 22k 22k 94k 94k 14k 50k 20k 20k 20k 40k 50k PEAK 15k 40k 2k 1 75k 1 3V 2k 1k 180k 3k 12k 12k 20k 40k 30k 10pF 50 A BOTTOM PEAK K 1 x0 5 x2 x0 5 x2 PIN SEL APC SW TEB TE BAL RFGC AGC Gian TEB TE BAL VCTRLPIN VCC APC ON 50 12dB Normal mode 0dB HiZ APC ON 0 6dB Normal mode 0dB GND APC OFF LDO H 50 0dB CD RW mode 12dB ...

Page 37: ...king search system 12 RFDC O RF signal peak detection output pin 13 GVSW I AGC FE TE amp gain change pin 14 VRO O Reference voltage VRO output pin VRO 1 2VCC When VCC 3 3V 15 FEO O Focus error signal generation amp output pin 16 FEN I Focus error signal generation amp negative phase input pin 17 RFRP O Signal amp output pin for track count Combining RFRP signal and TEO signal with TC94A14F FA conf...

Page 38: ... pin L for L channel and H for R channel Output polarity can be inverted by command 3 AOUT O Audio data output pin MSB first or LSB first selectable by command 4 DOUT O Digital data output pin Outputs up to double speed playback 5 IPF O Correction flag output pin When set to H AOUT output cannot be corrected by C2 correction processing 6 VDD3 Digital 3 3V power supply voltage pin 7 VSS3 Digital GN...

Page 39: ...H output with UHS H 39 AVDD3 Analog 3 3V power supply voltage pin 40 FMO O Feed equalizer output pin 41 DMO O Disc equalizer output pin 42 VSS3 Digital GND pin 43 VDD3 Digital 3 3V power supply voltage pin 44 TESIN I Test input pin Normally fixed to L 45 XVSS3 System clock oscillator GND pin 46 XI I System clock oscillator input pin 47 XO O System clock oscillator output pin 48 XVDD3 System clock ...

Page 40: ... IBR IAR CD CH TAPE TUNER POWER SUPPLY SOURCE SELECTOR VOLUME 1 20 to 31 dB LOUDNESS LEFT BASS LEFT 15 dB TREBLE LEFT 12 dB BASS RIGHT 15 dB TREBLE RIGHT 12 dB MUTE FUNCTION ZERO CROSS DETECTOR VOLUME 2 0 to 55 dB BALANCE FENDER REAR VOLUME 2 0 to 55 dB BALANCE FENDER FRONT HC BUS REC VOLUME 2 0 to 55dB BALANCE FENDER FRONT VOLUME 2 0 to 55dB BALANCE FENDER REAR VOLUME 1 20 to 31 dB LOUDNESS RIGHT...

Page 41: ...d 13 ICL I Input C left source 14 IMO Not used 15 IBL I Input B left source 16 IAL I Input A left source 17 IAR I Input A right source 18 IBR I Input B right source 19 CAP Electronic filtering for supply 20 ICR I Input C right source 21 Vref Reference voltage 0 5Vcc 22 IDR Not used 23 QSR O Output source selector right channel 24 ILR I Input loudness right channel 25 IVR I Input volume 1 right con...

Page 42: ... mecha switch 1 17 BUSINT I J BUS interruption 18 PS2 I Power save 2 19 21 NC Non connect 22 REMCON I Remocon signal input 23 AVDD A D converter power supply 24 AVREF0 A D converter reference voltage 25 VOL1 I Volume encoder pulse input 1 26 VOL2 I Volume encoder pulse input 2 27 KEY0 I Key input 0 28 KEY1 I Key input 1 29 KEY2 I Key input 2 30 LEVEL I Level meter input 31 NC Non connect 32 SM I S...

Page 43: ...66 PLLCE O Chip enable output for PLL 67 PLLDA O Data output for PLL 68 PLLCLK O Clock output for PLL 69 PLLDI I Data input from PLL 70 TELMUTE I Telephone muting detection input 71 NC Non connect 72 VSS Connect to GND 73 VSDIMIN I Dimmer detection input 74 PS1 I Power save 1 75 POWER O Power ON OFF control output 76 CDON O CD power supply control output 77 MUTE O Muting output 78 DIMOUT O Dimmer ...

Page 44: ... No 49798 AV MULTIMEDIA COMPANY 10 1 1chome Ohwatari machi Maebashi city 371 8543 Japan VICTOR COMPANY OF JAPAN LIMITED 200303WPC Printed in Japan KD S895 ...

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