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JVC KD-S795 Service Manual

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SERVICE MANUAL
02
2003
49789
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-S795
COMPACT
DIGITAL AUDIO
TABLE OF CONTENTS
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD.
Area Suffix
U ----------- Other Areas
KD-S795
No.49789
2003/02

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Summary of Contents for JVC KD-S795

  • Page 1 KD-S795 SERVICE MANUAL CD RECEIVER 49789 2003 KD-S795 COMPACT Area Suffix U ----------- Other Areas DIGITAL AUDIO TABLE OF CONTENTS Important Safety Precautions ............1-2 Disassembly method .

  • Page 2: Important Safety Precautions

    KD-S795 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-S795 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-S795 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 left part of the front panel assembly and remove the front panel assembly in the direction of the arrow.
  • Page 5 KD-S795 2.1.3 Removing the heat sink (See Fig.5) (1) Remove the two screws C and two screws D on the left side of the main body. Heat sink Fig.5 2.1.4 Removing the bottom cover (See Figs.6 and 7) • Prior to performing the following procedure, remove the front Joint c panel assembly, front chassis assembly and heat sink.
  • Page 6 KD-S795 2.1.6 Removing the main board Main board (See Fig.9) • 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 H attaching the main board.
  • Page 7 KD-S795 2.1.8 Removing the front board (See Figs.11 to 13) • Prior to performing the following procedure, remove the front panel assembly. (1) Remove the four screws K on the back side of the front panel assembly. (2) Release the ten joints f .
  • Page 8 KD-S795 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-S795 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-S795 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-S795 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-S795 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-S795 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 assembly in the direction of the arrow to remove it from the chassis rivet assembly.
  • Page 14 KD-S795 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 the pu.
  • Page 15 KD-S795 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-S795 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-S795 2.2.12 Reassembling the mode sw. / select lock arm Select lock arm spring (See Figs.24 to 26) REFERENCE: Hook w Reverse the above removing procedure. Joint v (1) Reattach the select lock arm spring to the top plate and set...
  • Page 18 KD-S795 2.2.13 Removing the select arm R / link plate Link plate Joint c' 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-S795 2.2.15 Removing the loading roller assembly (See Figs.31 to 33) Loading roller assembly • 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-S795 2.2.16 Removing the loading gear 5, 6 and 7 (See Figs.35 and 36) Loading gear bracket • Prior to performing the following procedure, remove the top cover, chassis unit, pickup unit and top plate assembly. Loading gear 6 (1) Remove the screw K attaching the loading gear bracket.

  • Page 21: Pull Out The Loading Gear

    KD-S795 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-S795 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 FM 87.5MHz ~ 107.9MHz 7. Tracking offset meter AM 531kHz ~ 1602 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.The loss of 6dB need not be considered...
  • Page 24 KD-S795 3.2 Troubleshooting 3.2.1 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.
  • Page 25 KD-S795 3.2.5 Signal processing section No sound from either Compare the L-ch and R-ch Is the sound output from to locate the defective point. channel. both channels (L, R)? Check the vicinity of the Normal Is 9V present at IC101 pin Q981 audio power supply.
  • Page 26 KD-S795 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-S795 SECTION 4 Description of major ICs 4.1 HA13164A (IC961) : Regulator • Terminal 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-S795 4.2 LA47505 (IC351) : Power amp. • Terminal layout Protective circuit Stand by Switch Ripple Mute Filter circuit protective circuit Muting & On Time Control Circuit 1-28 (No.49789)
  • Page 29 KD-S795 • Terminal layout • Pin function Pin No. Symbol Function AC CONT1 Header of IC GND1 Power GND OUTFR- Outpur(-) for front Rch STBY Stand by input OUTFR+ Output (+) for front Rch Vcc1/2 Power input OUTRR- Output (-) for rear Rch...
  • Page 30 KD-S795 4.3 LA6579H-X (IC561) : 4-Channel bridge 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 Signal system S-GND power supply VIN1-SW All outputs ON/OFF H : ON VO2+ MUTE MUTE...
  • Page 31 KD-S795 • Pin function Pin No. Symbol Function VIN1-A CH1 input AMP_inverted input VIN1+A CH1 input AMP_non-inverted input VCCP1 CH1 and CH2 power stage power supply VO1+ Output pin(+)for channel 1 VO1- CH1 output pin (-) for channel 1 VO2+...
  • Page 32 KD-S795 4.4 NJM4565M-WE (IC571) : CD L.P.F. A OUTPUT B OUTPUT A INPUT A INPUT B INPUT B INPUT 1-32 (No.49789)
  • Page 33 KD-S795 4.5 PT6523LQ (IC601) : LCD driver • Pin layout • Block diagram COMMON SEGMENT DRIVER & LATCH DRIVER CLOCK GENERATOR SHIFT REGISTER ADDRESS DETECTOR • Piin function Pin No. Pin Name Description 1~ 52 SG1 ~ SG52 Segment Output Pins...
  • Page 34 KD-S795 4.6 TA2157FN-X(IC501):RF amp • Terminal layout • Block diagram PEAK 50 A BOTTOM PEAK 1.75k 240k 15pF x0.5 240k 15pF x0.5 180k 40pF RFGC (APC SW) (TE BAL) (AGC Gian) (TE BAL) VCTRLPIN Normal mode APC ON -50% +12dB...
  • Page 35 KD-S795 • Pin function Pin No. Symbol Function 3.3V power supply pin Main-beam amp input pin Main-beam amp input pin Sub-beam amp input pin Sub-beam amp input pin Monitor photo diode amp input pin Laser diode amp output pin APC circuit ON/OFF control signal, laser diode (LDO) control signal input or bottom/peak detection frequency change pin.
  • Page 36 KD-S795 4.7 TC94A14FA (IC521) : DSP & DAC • Terminal layout & block daiagram Clock generator 1-bit Servo control Digital equalizer Address automatic circuit adjustment circuit Data CLV servo slicer 16 k Synchronous guarantee decoder Audio out Digital circuit output...
  • Page 37 KD-S795 Symbol I/O Descroption TMAX O TMAX detection result output pin. TMAX Detection Result TMAX Output Longer than fixed period "PV " Within fixed period "HiZ" Shorter than fixed period "AV " LPFN I Inverted input pin for PLL LPF amp.
  • Page 38 KD-S795 4.8 RPM6938-SV4 (IC602) : Remote sensor • Pin diagram • Block diagram Comp Rout Detector conversion trimming circuit magnetic shield 1-38 (No.49789)
  • Page 39 KD-S795 4.9 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 40 KD-S795 4.10 UPD178078GF-594 (IC701) : System CPU • Pin layout • Pin function Pin No. Symbol Function No use VOL-DA I/O VOL IC communication line VOL-CLK VOL IC communication line No use LCD-DA LCD driver communication line LCD-CLK LCD driver communication line...
  • Page 41 KD-S795 Pin No. Symbol Function FM E.OUT PLL error output for FM IC(VPP) Setting to write for flash RESET System reset CD mechanism switch REMOCON Remocon input 53,54 No use POWER Power control CD-ON CD power control MUTING Muting control...
  • Page 42 KD-S795 VICTOR COMPANY OF JAPAN, LIMITED AV & MULTIMEDIA COMPANY 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan (No.49789) Printed in Japan 200302WPC...

  • Page 43: Schematic Diagrams

    KD-S795 SCHEMATIC DIAGRAMS CD RECEIVER KD-S795 CD-ROM No.SML200302 Area suffix U --------------- Other Areas COMPACT DIGITAL AUDIO Contents Block diagram Standard schematic diagrams Printed circuit boards 2-5~7 No.49789SCH COPYRIGHT 2003 VICTOR COMPANY OF JAPAN, LTD. 2003/02...

  • Page 44: Safety Precaution

    KD-S795 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 45: Block Diagram

    KD-S795 Block diagram J931 L-CH FM/AM LINE OUT R-CH REAR L TUNER REAR R SW1,SW2,PSW FM/AM FMEO LM,MSW FMOSC AMEO DMO,FMO IC351 SPINDLE+ IC301 CDON IC521 TRO,FOO SPINDLE- MONO OUT LF POWER CD-RW E.VOL POSITION SET IC561 OUT RF FEED+ S.METER...

  • Page 46: Standard Schematic Diagrams

    KD-S795 KD-S795 Standard schematic diagrams Main amplifier section IC351 LA47505 QAU0281-001 C351 R351 0.33 4.7u R352 R201 C203 1/50 C352 0.33 R101 C103 1/50 0.1/50 R302 C346 2.2/50 C347 0.22/50 CH.L C301 4.7/25 C304 C305 UN2211-X 0.22 0.033 C451 R451 0.33...
  • Page 47 KD-S795 CD servo control section R564 FEED- R562 8.2K FEED+ R592 R595 FEED- FEED- C592 R563 4.7K R594 R591 C593 CD.L R593 C561 120p FEED+ FEED+ 4.7/25 R566 47/6.3 8.2K Q561 2SB1322/RS/-T SPINDLE- SPINDLE+ B562 R519 D561 SPINDLE- SPINDLE- D564...
  • Page 48 KD-S795 KD-S795 LCD & Key control section EN601 IC602 QSW0793-001 RPM6938-SV4 R661 C681 0.022 CN601 R662 NNZ0087-001 ACC5V LCD1 ENC1 ENC2 LCDCE LCDDA Main amplifier LCDCL section CN701 KEY2 KEY1 KEY0 R670 DIMMER R671 R615 R605 R604 R603 R602 R601...
  • Page 49 KD-S795 Printed circuit boards Main board Forward side C964 IC961 J931 C960 B961 C970 L961 R965 C994 J771 CN901 C401 D963 C963 D994 C914 D962 B354 B962 D960 Q964 R473 C961 R474 R373 C962 R374 Q963 B355 R961 C301 C976...
  • Page 50 KD-S795 Main board Reverse side CN901 C964 J771 R914 IC961 C972 C371 C914 C772 C962 D960 C372 R476 B355 B351 B354 R961 C961 R472 C963 C401 C301 C356 C966 J931 C365 C968 C965 Q977 C969 C373 C976 D977 C977 R971...
  • Page 51 KD-S795 Front board Forward side D625 D619 D622 S613 IC602 S617 S603 EN601 D620 R615 D607 D606 D623 S605 R605 S607 R604 R603 D621 R601 R606 R602 R649 R607 S602 S616 S614 D613 LCD1 D609 D610 R610 D614 S601 S610...
  • Page 52 KD-S795 VICTOR COMPANY OF JAPAN, LIMITED AV & MULTIMEDIA COMPANY 10-1,1Chome,Ohwatari-machi,Maebashi-city,371-8543,Japan Printed in Japan (No.49789SCH) 2003/02...

  • Page 53: Parts List

    KD-S795 PARTS LIST [ KD-S795 ] * All printed circuit boards and its assemblies are not available as service parts. Area suffix U --------------------- Other Areas - Contents - 3- 2 Exploded view of general assembly and parts list (Block No.M1) 3- 5 CD mechanism assembly and parts list (Block No.MB)
  • Page 54 KD-S795 Exploded view of general assembly and parts list Block No.
  • Page 55 KD-S795 Parts list (General assembly) Block No. M1MM Item Parts number Parts name Q'ty Description Area --------------------- CD MECHA GE10043-205A TOP CHASSIS GE40135-001A EARTH PLATE GE30568-006A SIDE PANEL GE30393-002A BOTTOM COVER FSMA3005-001 INSULATOR QYSDST2604Z SCREW 3 CHASSIS+CD MECH FSKZ4005-001 SCREW...
  • Page 56 KD-S795 Parts list (General assembly) Block No. M1MM Item Description Parts number Parts name Q'ty Area VKW3001-330 COMP.SPRING 1 FOR DETACH BUTT GE10060-001A REAR COVER VKZ4777-001 MINI SCREW 4 FRONT+REAR LCD CASE GE30821-001A GE30805-001A LCD LENS GE30806-001A LENS CASE GE40150-004A...
  • Page 57 KD-S795 CD mechanism assembly and parts list Block No. Grease TNG-87 TN-2001-1011 GP-501MK CFD-005Z GP-501A...

  • Page 58: Loading Gear

    KD-S795 Parts list (CD mechanism) Block No. MBMM Item Description Parts number Parts name Q'ty Area 30320101T FRAME 30320102T TOP COVER 30320115T DANPER F 30320116T DANPER R 303205505T CHASSIS RIVET 303205503T CHANGE P. RVT A 303205301T CLAMPER ASS'Y 303205302T SPINDLE MOTOR A...

  • Page 59: Loading Gear

    KD-S795 Parts list (CD mechanism) Block No. MBMM Item Description Parts number Parts name Q'ty Area 30321103T LOADING GEAR 3 30321104T LOADING GEAR 4 30321105T LOADING GEAR 5 LOADING GEAR 6 30321106T 30321107T LOADING GEAR 7 30321111T ROLLER GUIDE 30321114T...
  • Page 60 KD-S795 Electrical parts list (Main board) Block No. 01 Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area NCB31EK-473X C CAPACITOR C 510 NCB31CK-104X C CAPACITOR QEKJ1HM-104Z E CAPACITOR .10MF 20% 50V C 511 NCB31CK-104X...
  • Page 61 KD-S795 Electrical parts list (Main board) Block No. 01 Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area C 706 NCS31HJ-220X C CAPACITOR D 711 UDZS6.2B-X SI DIODE C 707 QEKJ0JM-227Z E CAPACITOR 220MF 20% 6.3V D 712 UDZS6.2B-X...
  • Page 62 KD-S795 Electrical parts list (Main board) Block No. 01 Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area R 13 NRS181J-150X MG RESISTOR R 595 NRSA63J-0R0X MG RESISTOR R 14 NRSA63J-103X MG RESISTOR R 596...
  • Page 63 KD-S795 Electrical parts list (Main board) Block No. 01 Item Parts number Parts name Remarks Area R 966 NRSA63J-123X MG RESISTOR R 967 NRSA63J-273X MG RESISTOR R 968 NRS181J-222X MG RESISTOR R 969 NRS181J-222X MG RESISTOR S 701 QSW0451-001 DETECT SWITCH...
  • Page 64 KD-S795 Electrical parts list (Front board) Block No. 02 Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area C 601 NCB31HK-223X C CAPACITOR R 647 NRSA02J-122X MG RESISTOR C 602 NCS31HJ-681X C CAPACITOR R 648...
  • Page 65 KD-S795 < M E M O > 3-13...
  • Page 66 KD-S795 Packing materials and accessories parts list Block No. Block No. A1~A4 KIT:A5~A9 3-14...
  • Page 67 KD-S795 Parts list (Packing) Block No. M3MM Item Parts number Parts name Q'ty Description Area POLY BAG 1 FOR INST. BOOK FSPG4002-001 QPA00801205 POLY BAG FSYH4036-068 SHEET 1 MIRAMA SHEET QPA01003003 POLY BAG QPC03004315P POLY BAG GE30766-001A CARTON GE10070-001A EPS CUSHION Parts list (Accessories) Block No.

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