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JVC KD-S785 Service Manual
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JVC KD-S785 Service Manual

JVC KD-S785 Service Manual

Cd receiver
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Download this manual See also: Service Manual, Instruction Manual
QQ
3 7 63 1515 0
SERVICE MANUAL
TE
L 13942296513
Contents
Safety precaution
Preventing static electricity
Disassembly method
Adjustment method
www
.
http://www.xiaoyu163.com
CD RECEIVER
KD-S785
ATT
SOUND
U
R
SOURCE
F
D
VOL
VOL
x
ao
u163
y
i
COPYRIGHT
2002 VICTOR COMPANY OF JAPAN, LTD.
http://www.xiaoyu163.com
2 9
8
45Wx4
KD-S785
LOUD
DISP
7
8
9
10
11
12
Q Q
3
6 7
1 3
1 5
1-2
Flow of functional
1-3
operation untill TOC read
1-4
Maintenance of laser pickup
1-11
Replacement of laser pickup
Description of major ICs
co
.
9 4
2 8
TU NER
SCAN
MO
RPT
RND
SCM
0 5
8
2 9
9 4
Area Suffix
U
Other Areas
m
KD-S785
9 9
2 8
9 9
1-12
1-14
1-14
1-15~33
No.49748
Jun. 2002

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Summary of Contents for JVC KD-S785

  • Page 1 KD-S785 3 7 63 1515 0 SERVICE MANUAL CD RECEIVER KD-S785 SOUND 45Wx4 KD-S785 LOUD SOURCE TU NER DISP SCAN L 13942296513 Area Suffix Other Areas Contents Safety precaution Flow of functional Preventing static electricity operation untill TOC read...

  • Page 2: Safety Precaution

    KD-S785 3 7 63 1515 0 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 adjustment or operation check.
  • Page 3 KD-S785 3 7 63 1515 0 Preventing static electricity 1.Grounding to prevent damage by 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-S785 3 7 63 1515 0 Disassembly method <Main body> Removing the front panel assembly (See Fig.1) Press the eject button in the lower right part of the front panel. Remove the front panel assembly from the body. Front panel assembly Eject button Fig.1...
  • Page 5 KD-S785 3 7 63 1515 0 Removing the heat sink (See Fig.4) Remove the three screws A on the left side of the body. Heat sink Fig.4 Joint b Removing the bottom cover (See Fig.5, 6) Bottom cover Prior to performing the following procedure, remove the front panel assembly, the front chassis assembly and the heat sink.
  • Page 6 KD-S785 3 7 63 1515 0 Removing the main board (See Fig.7, 8) Prior to performing the following procedure, remove the front panel assembly, the front chassis assembly, the heat sink and the bottom cover. Remove the screw B, the four screws C and the three screws D attaching the rear bracket on the back of the body.
  • Page 7 KD-S785 3 7 63 1515 0 Removing the control switch board (See Fig.10 ~ 12) Prior to performing the following procedure, remove the front panel assembly. Remove the four screws G attaching the rear cover on the back of the front panel assembly.

  • Page 8: Cd Mechanism Section

    KD-S785 3 7 63 1515 0 Damper bracket <CD mechanism section> CD mechanism assembly Removing the CD mechanism control board (See Fig.1 and 2) Unsolder the part a and b on the CD mechanism control board. Remove the stator fixing the CD mechanism control board and the damper bracket (To remove the stator smoothly, pick up the center part).
  • Page 9 KD-S785 3 7 63 1515 0 Damper bracket assembly CD mechanism Removing the CD mechanism assembly (See Fig.1, 6 to 9) Prior to performing the following procedure, remove the CD mechanism control board and the front bracket (loading motor).
  • Page 10 KD-S785 3 7 63 1515 0 Removing the feed motor assembly FD screw Part i Feed motor assembly (See Fig.10) Prior to performing the following procedure, remove the CD mechanism control board, the front bracket Part j (loading motor) and the CD mechanism assembly.

  • Page 11: Adjustment Method

    6. Digital tester FM 87.5MHz ~ 108.0MHz 7. Tracking offset meter AM 531kHz ~ 1602 kHz 8. Test Disc JVC :CTS-1000 9. Extension cable for check EXTGS004-26P 1 Dummy load 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 12 KD-S785 3 7 63 1515 0 Flow of functional operation until TOC read Power ON • When the laser diode correctly Set Function to CD • When the pickup correctly moves emits to the inner area of the disc...
  • Page 13 KD-S785 3 7 63 1515 0 Feed Section Check CD 9V Is the voltage output at Is the wiring for IC521 Is 5V present at IC581 and 5V. IC521 pin "53" 5V or 0V? (90) ~ (100) correct? pin "11"? Check the vicinity of IC521.
  • Page 14 KD-S785 3 7 63 1515 0 Maintenance of laser pickup (1) Cleaning the pick up lens Before you replace the pick up, please try to clean the lens with a alcohol soaked cotton swab. (2) Life of the laser diode When the life of the laser diode has expired, the following symptoms will appear.
  • Page 15 KD-S785 3 7 63 1515 0 Description of major ICs TC9490FA (IC541) : DSP & DAC 1.Pin layout & Block daiagram TEZI Clock generator SBAD 1-bit Servo control RFRP RFZI ZDET RFCT Digital equalizer Address automatic circuit adjustment circuit...
  • Page 16 KD-S785 3 7 63 1515 0 2.Pin function (1/2) TC9490FA(2/3) Pin No. Symbol Function Bit clock outputpin 32fs, 48fs, or 64fs selectable by command. LRCK L/R channel clock output pin."L" for L channe and "H" for R channel. Output polarity can be inverted by command.
  • Page 17 KD-S785 3 7 63 1515 0 2.Pin function (2/2) TC9490FA(3/3) Pin No. Symbol Function RFGC RF amplitude adjustment control signal output pin. TEBC Tracking balance control signal output pin. APC circuit ON/OFF signal output pin. At laser on,high impedance with UHS="L"...
  • Page 18 KD-S785 3 7 63 1515 0 UPD784215AGC172 (IC701) : Main micon 1.Pin layout 100 ~ 76 26 ~ 50 2.Pin functions(1/2) Pin No. Symbol Function CD mecha sw2 CD mecha sw3 CD mecha sw4 REST Rest sw Loading/Eject motor control (Loading side)
  • Page 19 KD-S785 3 7 63 1515 0 2.Pin functions(2/2) Pin No. Symbol Function SD/ST Station detector or stereo signal input LOCAL Loal or distance selecting output MONO Monoral selection output MP3 CLK CLK output for MP3 decoder MP3 DATA IN...
  • Page 20 KD-S785 3 7 63 1515 0 LA4743K (IC301) : Power amp. 1.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...
  • Page 21 KD-S785 3 7 63 1515 0 2.Terminal layout 3.Pin function Pin No. Symbol Function Header of IC Power GND Outpur(-) for front Rch RFO- STBY Stand by input RFO+ Output (+) for front Rch VCC1/2 Power input Output (-) for rear Rch...
  • Page 22 KD-S785 3 7 63 1515 0 TA2147F-X (IC521) : RF amp. 1.Terminal layout 2.Block diagram PEAK GVSW 12 RFDC 20 A L 13942296513 TEBC 50 A RFRP BOTTOM RFRPIN PEAK RFGO 1.75k 240k 15pF x0.5 RFGC 240k 15pF x0.5...
  • Page 23 KD-S785 3 7 63 1515 0 3.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 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 24 KD-S785 3 7 63 1515 0 TC94A02F-005 (IC401) : DSP AD10 VDDT LRCKiA BCKiA SDi0 L 13942296513 AD13 VDDT AD14 /MiCK AD16 MiDio AD15 MiMD /RESET Timing Generator General Input Port u163 1-24 http://www.xiaoyu163.com...
  • Page 25 KD-S785 3 7 63 1515 0 3.Pin function(1/2) TC94A02F-005 Pin No. Symbol Function /RESET Hard reset input terminal(H:Normal operation L: Reset) Micon I/F mode select input terminal MiMD External SRAM address output 0 terminal External SRAM address output 1 terminal...
  • Page 26 KD-S785 3 7 63 1515 0 3.Pin function(2/2) TC94A02F-005 Pin No. Symbol Function External SRAM data input/output 4 terminal Digital power supply (2.5V) terminal External SRAM data input/output 5 terminal External SRAM data input/output 6 terminal External SRAM data input/output 7 terminal...
  • Page 27 KD-S785 3 7 63 1515 0 AN80T07 (IC901) : Regulator 1.Pin layout 2.Block diagram MODE1 *ASO,Peak Current Protection. *Thermal Protection (Except VDD,Comp output). Reference Voltage Outputs L 13942296513 Driver Driver Driver Driver MODE2 SW5V Out COMP AUDIO BATT.DET 5.7V 8.0V...
  • Page 28 KD-S785 3 7 63 1515 0 K6R1008VCTI12-X (IC451) : SRAM 1.Pin layout 2.Block diagram Clk Gen. Pre-Charge Circuit Memory Array 512 Rows 256x8 Columns SOJ/ Data I/O Circuit TSOP2 ~I/O Cont. Column Select Gen. 3.Pin function Pin Name Pin Function...
  • Page 29 KD-S785 3 7 63 1515 0 LA6574H-X (IC501) :CD driver 1.Terminal layout & brock daiagram Thermal Shutdown VCC2 1 28 REV POWER supplise 27 FWD V05- 2 26 S-GND V05+ 3 25 VCONT V04+ 4 V04- 5 24 VIN4...
  • Page 30 KD-S785 3 7 63 1515 0 LC75823W (IC601) : LCD driver 1. Pin Layout & Symbol 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 2.
  • Page 31 KD-S785 3 7 63 1515 0 NJM4565M-WE (IC581) : Ope. amp A OUTPUT A INPUT B OUTPUT A INPUT B INPUT B INPUT NJU7241F25-X (IC461) : Regulator 1.Pin layout 2.Block diagram Short protect GND 1 5 STB VIN 2...
  • Page 32 KD-S785 3 7 63 1515 0 TB2118F-X (IC31) : PLL 1.Terminal Layout 2.Block diagram Constant power supply voltage Buff. ON/OFF AM CP. Phase OSC circuit Reference Counter Comparator switch FM VCO 4-bit Prescaler Swallow counter 12-bit AMVCO Programmable counter...
  • Page 33 KD-S785 3 7 63 1515 0 TEA6320T-X (IC161) : E.volume 1.Pin layout 2.Block diagram VOLUME 2 MUTE 0 to 55 dB FUNCTION BALANCE OUTRR OUTLR ZERO CROSS FENDER REAR POWER DETECTOR OUTRF OUTLF SUPPLY VOLUME 1 BASS TREBLE +20 to -31 dB...
  • Page 34 KD-S785 3 7 63 1515 0 L 13942296513 u163 VICTOR COMPANY OF JAPAN, LIMITED MOBILE ELECTRONICS DIVISION PERSONAL & MOBILE NETWORK BUSINESS UNIT. 10-1,1Chome,Ohwatari-machi,Maebashi-city,371-8543,Japan 200206 (No.49748) http://www.xiaoyu163.com...

  • Page 35: Schematic Diagrams

    KD-S785 3 7 63 1515 0 SCHEMATIC DIAGRAMS CD RECEIVER KD-S785 CD-ROM No.SML200201 SOUND 45Wx4 LOUD SOURCE DISP SCAN L 13942296513 Area Suffix Other Areas Contents Block diagram Standard schematic diagrams Printed circuit boards 2-5,6 u163 No.49748 COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.
  • Page 36 http://www.xiaoyu163.com Safety precaution 3 7 63 1515 0 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 37: Block Diagram

    KD-S785 3 7 6 3 1 5 1 5 0 Block diagram OUTLF,OUTLR TUL,TUR IC161 OUTRF,OUTRR TUNER E.VOL LOADING+ PACK LOADING- LOADING LOADING+ SPINDLE+ IC501 AMVT MOTOR LOADING- SPINDLE- FMVT FEED+,FEED- DRIVER FOCUS+,FOCUS- IC31 DMO,FMO SEEK/STOP IC301 TRACKING+ REST...
  • Page 38 KD-S785 KD-S785 3 7 6 3 1 5 1 5 0 Standard schematic diagrams D243 1SS133 R244 C243 Main amp section R243 0.047 180k R245 C241 R247 1/50 R242 R241 IC301 C242 22/16 LA4743K Q241 QAU0258-001 2SD601A( R) LEVEL...
  • Page 39 KD-S785 3 7 6 3 1 5 1 5 0 CD servo control section R502 6.8k R503 5.6k R586 R584 1SS355-X R587 C582 R581 CD.R R501 6.8k D981 R-CH R585 2SB709A/R/-X C584 1.5k Q982 8.2k 4.7/25 C503 Q981 R981 R506 47/6.3...
  • Page 40 KD-S785 KD-S785 3 7 6 3 1 5 1 5 0 LCD & Key control section QSW0863-001 JS690 RPM6938-SV4 IC602 0.022 R661 C681 R662 VCM0335-001 CJ601 LCD1 ACC5V QLD0225-001 REMOCON ENC1 ENC2 BUS2 LCDCL LCDDA LCDCE KEY0 BUS1 KEY1...
  • Page 41 KD-S785 Printed circuit boards 3 7 63 1515 0 Main board(Foward side) R904 IC901 C914 C901 C904 L901 D341 C802 C911 J801 J321 Q321 CN901 C905 C913 Q341 D902 D901 C902 C163 Q891 R901 R341 C173 C910 C907 R321...
  • Page 42 KD-S785 3 7 63 1515 0 Main board(Reverse side) C916 C917 C891 IC901 CONT R971 J321 C912 R972 D972 L901 C325 D971 J801 C906 D901 C324 C323 C904 CN901 C914 C322 R902 C852 C971 C163 C173 Q351 Q331 C905...
  • Page 43 http://www.xiaoyu163.com 3 7 63 1515 0 < M E M O > L 13942296513 u163 http://www.xiaoyu163.com...
  • Page 44 KD-S785 3 7 63 1515 0 L 13942296513 u163 VICTOR COMPANY OF JAPAN, LIMITED MOBILE ELECTRONICS DIVISION PERSONAL & MOBILE NETWORK BUSINESS UNIT. 10-1,1Chome,Ohwatari-machi,Maebashi-city,371-8543,Japan 200206 (No.49748) http://www.xiaoyu163.com...

  • Page 45: Parts List

    KD-S785 3 7 63 1515 0 PARTS LIST [ KD-S785 ] * All printed circuit boards and its assemblies are not available as service parts. Area suffix L 13942296513 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 46 KD-S785 3 7 63 1515 0 Exploded view of general assembly and parts list Block No. L 13942296513 u163 http://www.xiaoyu163.com...
  • Page 47 KD-S785 3 7 63 1515 0 Parts list (General assembly) Block No. M1MM Item Q'ty Description Parts number Parts name Area ------------ CD MECHA (1325) FSJC1029-401 TOP CHASSIS FSMH3001-202 SIDE PANEL FSKM3011-002 BOTTOM COVER FSMA3004-203 INSULATOR SCREW 3 CHASSIS+MECHA BKT...
  • Page 48 KD-S785 3 7 63 1515 0 Parts list (General assembly) Block No. M1MM Item Parts number Parts name Q'ty Description Area QYSDST2606Z SCREW 1 FOR ANT QYSDSF3006Z SCREW 1 FOR LINE OUT SCREW 3 16P & REG BKT QYSDST2606Z...
  • Page 49 KD-S785 3 7 63 1515 0 CD mechanism assembly and parts list Block No. Grease G-31SA TN-CCD1001Z-138S G-31SA(Bottom side) RX-405 L 13942296513 u163 106 29 http://www.xiaoyu163.com...
  • Page 50 KD-S785 3 7 63 1515 0 Parts list (CD mechanism) Block No. MBMM Item Q'ty Description Parts number Parts name Area 30310101T FRAME 30310103T DANPER PIN 30310107T UPPER PLATE 30310108T SEL STOP PLATE 30310142T SEL ARM (L)L SEL ARM (R)L...
  • Page 51 KD-S785 3 7 63 1515 0 Parts list (CD mechanism) Block No. MBMM Item Description Parts number Parts name Q'ty Area 68150242T CONNECTOR 1 TKC-W26X-A1 30311105T SOPPORT PLATE 30311138T GR MT BLK(N) 30311109T LDG GEAR (2) 30311110T LDG GEAR (3)
  • Page 52 KD-S785 3 7 63 1515 0 Block No. 01 Electrical parts list (Main board) Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area QEKJ1CM-226Z E CAPACITOR 22MF 20% 16V C 303 NCS31HJ-391X C CAPACITOR...
  • Page 53 KD-S785 3 7 63 1515 0 Block No. 01 Electrical parts list (Main board) Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area C 526 QERF1AM-107Z E CAPACITOR 100MF 20% 10V C 781 QERF0JM-476Z E CAPACITOR 47MF 20% 6.3V...
  • Page 54 KD-S785 3 7 63 1515 0 Block No. 01 Electrical parts list (Main board) Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area D 852 CRS03-W SB DIODE NRSA63J-472X MG RESISTOR D 901 1N5401-TU-15...
  • Page 55 KD-S785 3 7 63 1515 0 Block No. 01 Electrical parts list (Main board) Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area R 411 NRSA63J-225X MG RESISTOR R 583 NRSA63J-223X MG RESISTOR R 412...
  • Page 56 KD-S785 3 7 63 1515 0 Electrical parts list (Main board) Block No. 01 Item Parts number Parts name Remarks Area R 783 NRSA63J-102X MG RESISTOR R 784 NRSA63J-473X MG RESISTOR R 851 NRSA63J-103X MG RESISTOR R 901 QRE142J-102X C RESISTOR 1.0K 5% 1/4W...
  • Page 57 KD-S785 3 7 63 1515 0 Block No. 02 Electrical parts list (Front board) Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area C 601 NCB31HK-223X C CAPACITOR R 639 NRSA63J-511X MG RESISTOR C 602...
  • Page 58 KD-S785 3 7 63 1515 0 Packing materials and accessories parts list Block No. Block No. A1~A3 L 13942296513 A13, A14 KIT : A4~A8 u163 3-14 http://www.xiaoyu163.com...
  • Page 59 KD-S785 3 7 63 1515 0 Parts list (Packing) Block No. M3MM Item Parts number Parts name Q'ty Description Area FSPG4002-001 POLY BAG 1 FOR INST BOOK QPA00801205 POLY BAG 1 FOR SCREW KIT QPA01003003 POLY BAG 1 FOR HARD CASE...