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JVC KD-LH70R Service Manual
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JVC KD-LH70R Service Manual

JVC KD-LH70R Service Manual

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3 7 63 1515 0
SERVICE MANUAL
04
2003
49803
TE
L 13942296513
1
Important Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
2
Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
3
Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19
4
Description of major ICs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23
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http://www.xiaoyu163.com
CD RECEIVER
KD-LH70R
ATT
SOUND
U
R
SOURCE
F
D
VOL
VOL
TABLE OF CONTENTS
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COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD.
http://www.xiaoyu163.com
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Area Suffix
E ---- Continental Europe
EX -------- Central Europ
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No.49803
KD-LH70R
9 9
9 9
2003/04

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Summary of Contents for JVC KD-LH70R

  • Page 1 KD-LH70R 3 7 63 1515 0 SERVICE MANUAL CD RECEIVER 49803 2003 KD-LH70R SOUND SOURCE L 13942296513 Area Suffix E ---- Continental Europe EX -------- Central Europ TABLE OF CONTENTS Important Safety Precautions ............1-2 Disassembly method .
  • Page 2 KD-LH70R SECTION 1 3 7 63 1515 0 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.
  • Page 3 KD-LH70R 1.2 Preventing static electricity 3 7 63 1515 0 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 KD-LH70R SECTION 2 3 7 63 1515 0 Disassembly method 2.1 Main body 2.1.1 Removing the front panel assembly (See Fig.1) (1) Push the detach button in the lower left part of the front panel and remove the front panel assembly in the direction Front panel assembly of the arrow.
  • Page 5 KD-LH70R 2.1.3 Removing the heat sink 3 7 63 1515 0 (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)
  • Page 6 KD-LH70R 2.1.5 Removing the rear bracket 3 7 63 1515 0 (See Fig.8) • Prior to performing the following procedure, remove the front panel assembly, front chassis assembly, heat sink and bottom cover. Rear bracket (1) Remove the three screws E, two screws F and two screws G on the back side of the main body.
  • Page 7 KD-LH70R 2.1.8 Removing the CD mechanism assembly 3 7 63 1515 0 (See Fig. 11) • Prior to performing the following procedure, remove the front panel assembly, front chassis assembly, heat sink, bottom cover, rear bracket, main board and CD mecha board.
  • Page 8 KD-LH70R 2.2 CD mechanism section 3 7 63 1515 0 2.2.1 Removing the top cover (See Figs.1 and 2.) (1) Remove the four screws A on the both side of the body. (2) Lift the front side of the top cover and move the top cover Joints a backward to release the two joints a.
  • Page 9 KD-LH70R 2.2.3 Removing the DET switch 3 7 63 1515 0 (See Figs.6 and 7.) (1) Extend the two tabs c of the feed sw. holder and pull out the switch. Tab c DET switch (2) Unsolder the DET switch wire if necessary.
  • Page 10 KD-LH70R 2.2.5 Removing the clamper assembly 3 7 63 1515 0 (See Figs.10 and 11.) • Prior to performing the following procedure, remove the top cover. Clamper arm spring (1) Remove the clamper arm spring. (2) Move the clamper assembly in the direction of the arrow to release the two joints d.
  • Page 11 KD-LH70R 2.2.7 Removing the pickup unit 3 7 63 1515 0 (See Figs.14 to 18.) Pickup unit • 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 12 KD-LH70R 2.2.9 Removing the trigger arm (See Figs.19 and 20.) 3 7 63 1515 0 • Prior to performing the following procedure, remove the top cover, connector board and clamper unit. Joint k (1) Turn the trigger arm in the direction of the arrow to release the joint k and pull out upward.
  • Page 13 KD-LH70R 2.2.11 Removing the mode sw. / select lock arm 3 7 63 1515 0 (See Figs.22 and 23.) • Prior to performing the following procedure, remove the top plate assembly. Top plate 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 14 KD-LH70R 2.2.13 Removing the select arm R / link plate 3 7 63 1515 0 (See Figs.27 and 28.) • Prior to performing the following procedure, remove the top plate assembly. Link plate Joint c' Joint r (1) Bring up the select arm R to release from the link plate...
  • Page 15 KD-LH70R 2.2.15 Removing the loading roller assembly 3 7 63 1515 0 (See Figs.31 to 33.) • Prior to performing the following procedure, remove the clamper assembly and top plate assembly. Loading roller assembly (1) Push inward the loading roller assembly on the gear side...
  • Page 16 KD-LH70R 2.2.16 Removing the loading gear 5, 6 and 7 3 7 63 1515 0 (See Figs.35 and 36.) • Prior to performing the following procedure, remove the top cover, chassis unit, pickup unit and top plate assembly. Loading gear bracket (1) Remove the screw K attaching the loading gear bracket.
  • Page 17 KD-LH70R 2.2.17 Removing the gears 3 7 63 1515 0 (See Figs.37 to 40.) • Prior to performing the following procedure, remove the top cover, chassis unit, top plate assembly and pickup unit. Joint n' Loading plate assembly Pull out the loading gear 3. (See Fig.35.) (1) Pull out the feed gear.
  • Page 18 KD-LH70R 2.2.18 Removing the turn table / spindle motor 3 7 63 1515 0 (See Figs.41 and 42.) • Prior to performing the following procedure, remove the top cover, connector board, chassis unit and clamper assembly. Turn table (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 19 6. Digital tester AM (MW) 522kHz ~ 1620kHz 7. Tracking offset meter (LW) 144kHz ~ 279kHz 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 20 KD-LH70R 3.2 Flow of functional operation unit TOC read 3 7 63 1515 0 Power ON When the laser diode correctly When the pickup correctly moves Set Function CD emits to the inner area of the disc Microprocessor $82 $81...
  • Page 21 KD-LH70R 3.3 Troubleshooting 3 7 63 1515 0 3.3.1 Feed section Is the voltage output at Is the wiring for IC621 Is 3.3V present at IC681 IC621 pin "40" 5V or 0V? pin "40"? pin "20"? Check CD 8V Check the vicinity of and 5V.
  • Page 22 KD-LH70R 3.4 Maintenance of laser pickup 3 7 63 1515 0 3.5 Replacement of laser pickup (1) Cleaning the pick up lens Before you replace the pickup, please try to clean the lens Turn of the power switch and, disconnect the with a alcohol soaked cotton swab.
  • Page 23 KD-LH70R SECTION 4 3 7 63 1515 0 Description of major ICs 4.1 BR24C01AFV-W-X (IC502) : EEPROM • Pin layout • Block diagram 1kbit EEPROM ARRAY 8bit 7bit ADDRESS SLAVE/WORD DATA 7bit DECODER ADDRESS REGISTER REGISTER L 13942296513 START...
  • Page 24 KD-LH70R 4.2 BR24C32F-X (IC771) : EEPROM 3 7 63 1515 0 • Pin layout • Pin function Symbol Function WPIN Power supply. A0,A1,A2 No use connect to GND. Serial clock input. I/O Serial data I/O of slave and word address.
  • Page 25 KD-LH70R 4.4 HA13164A (IC901) : Regulator 3 7 63 1515 0 • 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 26 KD-LH70R 4.5 HD74HC126FP-X (IC801) : Buffer 3 7 63 1515 0 • Pin layout • Pin function Input Output Note: H:High level L:Low level X:Irrelevant Z:Off(High-impedance) State a 3-state input • Block diagram Output Input L 13942296513 Output Sample as Load Circuit 1...
  • Page 27 KD-LH70R 4.7 HD74HCT126T-X : (IC503) Buffer 3 7 63 1515 0 • Pin layout • Pin function Input Output H : High level L : Low level X : Irrelevant Z : Off (Hhigh-impedance)state of a 3-stage output • Block diagram...
  • Page 28 KD-LH70R 4.8 LA47505 (IC301) : Power amp. 3 7 63 1515 0 • Block diagram Protective circuit Stand by Switch L 13942296513 Ripple Mute Filter circuit protective circuit Muting & On Time Control Circuit u163 1-28 (No.49803) http://www.xiaoyu163.com...
  • Page 29 KD-LH70R • Pin layout 3 7 63 1515 0 • 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...
  • Page 30 KD-LH70R 4.9 LA6579H-X (IC681) : 4-Channel bridge driver 3 7 63 1515 0 • 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...
  • Page 31 KD-LH70R • Pin function 3 7 63 1515 0 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...
  • Page 32 KD-LH70R 4.10 LC75873NW (IC601) : LCD Driver 3 7 63 1515 0 • Pin layout • Block diagram VDD1 COMON SEGMENT DRIVER DRIVER VDD2 CLOCK SHIFT REGISTOR GENERATOR ADDRESS DETECTOR L 13942296513 • Pin function Pin No. Pin name...
  • Page 33 KD-LH70R 4.11 LP61L1024S-12-X (IC653) : SRAM 3 7 63 1515 0 • Pin layout • Pin function Pin No. Symbol Function Not connect Address input NC(CE2) Address input Address input 5~12 A7 - A0 Address inputs 13~15 I/O1 - I/O3...
  • Page 34 KD-LH70R 4.12 NJM4565M-WE (IC251) : CD L.P.F. 3 7 63 1515 0 • Pin layout & Block diagram A OUTPUT B OUTPUT A INPUT A INPUT B INPUT B INPUT 4.13 NJM4565V-X (IC572) : Dual operation amplifier • Pin layout & Pin function...
  • Page 35 KD-LH70R 4.14 NJU7241F25-X (IC651) : Regulator 3 7 63 1515 0 • Pin layout GND 1 5 STB VIN 2 VOUT 3 4 NC • Block diagram Short protect VIN 2 3 VOUT STB 5 Vref GND 1 1 GND 4.15 NJU7241F33-X (IC504) : Voltage regulator...
  • Page 36 KD-LH70R 4.16 PCM1716E-X (IC571) : D/A converter 3 7 63 1515 0 • Pin layout • Block diagram Serial VoutL Low-pass Filter LBCK Input Mult-level EXTL 8X Oversampling DATA Delta-Sigma Digital Filter Low-pass VoutR Modulator Filter with ML/llS Function Controller...
  • Page 37 KD-LH70R 4.17 SAA6579T-X (IC71) : RDS detecter 3 7 63 1515 0 • Pin layout QUAL DATA Vref OSCO OSCI TEST SCOUT MODE • Block diagram ANTI- 57 kHz OSCILLATOR QUALITY BIT RECONSTRUCTION ALIASING BAND PASS GENERATOR FILTER FILTER...
  • Page 38 KD-LH70R 4.18 TA2157FN-X (IC601) : RF amp 3 7 63 1515 0 • Pin layout • Block diagram PEAK 50 A BOTTOM PEAK L 13942296513 1.75k 240k 15pF x0.5 240k 15pF x0.5 180k 40pF RFGC (APC SW) (TE BAL)
  • Page 39 KD-LH70R • Pin function 3 7 63 1515 0 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...
  • Page 40 KD-LH70R 4.19 TB2118F-X (IC31) : PLL 3 7 63 1515 0 • Pin Layout • 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...
  • Page 41 KD-LH70R 4.20 TDA7404D-X (IC161) : Carradio signal processor 3 7 63 1515 0 • Pin layout • Block diagram Mono Fader Mono Fader Mono Fader Mono Fader Mono Fader Mono Fader Zero Cross Mono/Beep Beep Digital Control I C-Bus...
  • Page 42 KD-LH70R 4.21 TC94A14FA (IC621) : DSP & DAC 3 7 63 1515 0 • Pin layout & Block daiagram Clock generator 1-bit Servo control Digital equalizer Address automatic circuit adjustment circuit Data CLV servo slicer 16 k Synchronous guarantee...
  • Page 43 KD-LH70R 3 7 63 1515 0 Pin No 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 "...
  • Page 44 KD-LH70R 4.22 UPD784215AGC220 (IC701) : Main micon 3 7 63 1515 0 • Pin Layout 100 ~ 76 26 ~ 50 • Pin function Pin No. Symbol Function CD RESET Reset output for CD sub-micon CD MUTING Muting request of CD sub-micon...
  • Page 45 KD-LH70R 3 7 63 1515 0 Pin No. Symbol Function BUZZER Buzzer output EPROM-DI I2C data input EPROM-DO I2C data output EPROM-CLK I2C clock output OPEN Door open switch 49~52 No use SD/ST Station detector or stereo indicator input...
  • Page 46 LCD DA Data output for LCD driver LCD CK Clock output for LCD driver L 13942296513 BUS I/O JVC BUS input/output control terminal (negative) BUS I/O JVC BUS input/output control terminal BUS SI JVC BUS data input terminal BUS SO...
  • Page 47 CD mechanism SW1 input terminal B.DET Backup power supply detection input terminal (H:Stop mode) P.DET Main power off detection input terminal (H:HALT mode) BUS INT JVC BUS communication start interrupt input terminal L 13942296513 MP3 REQ CD MP3 request signal input terminal VSS0 VDD1 3.3V...
  • Page 48 KD-LH70R 3 7 63 1515 0 L 13942296513 u163 VICTOR COMPANY OF JAPAN, LIMITED AV & MULTIMEDIA COMPANY MOBILE ENTERTAINMENT CATEGORY 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan (No.49803) Printed in Japan 200304WPC http://www.xiaoyu163.com...
  • Page 49 KD-LH70R 3 7 63 1515 0 SCHEMATIC DIAGRAMS CD RECEIVER KD-LH70R CD-ROM No.SML200304 Area Suffix E -------- Continental Europe EX ------------ Central Europe SOUND L 13942296513 SOURCE Contents Block diagram Standard schematic diagrams Printed circuit boards 2-5,6 u163 No.49803SCH COPYRIGHT 2003 VICTOR COMPANY OF JAPAN, LTD.
  • Page 50 KD-LH70R 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 51 KD-LH70R 3 7 6 3 1 5 1 5 0 Block diagram SUBW OUTPUT CN251 L, R IC251 SUBWOOFER INLF OUTLF TU.R IC301 INLR OUTRF TU.L IC161 FM/AM POWER E.VOL TUNER VA,VB IC601 RWSEL IC571 VOUTL IC572 OUTRF INRF...
  • Page 52 KD-LH70R KD-LH70R 3 7 6 3 1 5 1 5 0 Standard schematic diagrams Main amplifier section RB160M-30-X D243 R248 R244 C243 R243 0.047 IC301 LA47505 180k R245 C241 1/50 R242 R241 C242 22/16 Q241 D244 QAU0292-001 UDZS5.1B-X 2SD601A/R/-X...
  • Page 53 KD-LH70R CD servo control section 3 7 6 3 1 5 1 5 0 RWSEL R585 C589 C587 4.7/35 C585 120P R613 R581 C611 R583 R611 R610 CD.L-CH 4.7/35 R614 R612 C610 C586 R582 C588 R584 CD.R-CH 120P C590 4.7/35...
  • Page 54 KD-LH70R KD-LH70R 3 7 6 3 1 5 1 5 0 LCD & Key control section IC602 1 3 9 4 2 2 9 6 5 1 3 GP1UM261XK CN601 QNZ0006-001 ACC5V R660 REMOCON LCD1 QLD0257-001 EN601 R661 QSW0863-002...
  • Page 55 KD-LH70R 3 7 6 3 1 5 1 5 0 Printed circuit boards Main board Main board Forward side Reverse side D971 D972 Q977 J801 C910 Q976 C891 J321 R976 R977 C910 C321 IC901 R902 R972 R343 R903 R971...
  • Page 56 KD-LH70R KD-LH70R 3 7 6 3 1 5 1 5 0 Front board Front board Forward side Reverse side S614 R650 LCD1 EN601 EN601 R680 Q641 R620 D658 D655 D601 Q642 R654 R639 D656 D653 R653 R633 D657 D654...
  • Page 57 KD-LH70R 3 7 63 1515 0 < M E M O > L 13942296513 u163 http://www.xiaoyu163.com...
  • Page 58 KD-LH70R 3 7 63 1515 0 L 13942296513 u163 V ICTOR COMPANY OF JAPAN, LIMITED AV & MULTIMEDIA COMPANY 10-1,1Chome,Ohwatari-machi,Maebashi-city,371-8543,Japan Printed in Japan (No.49803SCH) 2003/04 http://www.xiaoyu163.com...
  • Page 59 KD-LH70R 3 7 63 1515 0 PARTS LIST [ KD-LH70R ] * All printed circuit boards and its assemblies are not available as service parts. Area suffix E------------ Continental Europe EX --------------- Central Europe L 13942296513 - Contents - Exploded view of general assembly and parts list (Block No.M1)
  • Page 60 KD-LH70R 3 7 63 1515 0 Exploded view of general assembly and parts list Block No. L 13942296513 u163 http://www.xiaoyu163.com...
  • Page 61 KD-LH70R 3 7 63 1515 0 General assembly Block No. [M][1][M][M]  Symbol No. Part No. Part Name Description Local  Symbol No. Part No. Part Name Description Local QYSDST2606Z SCREW 2.6mm x 6mm QYSDST2606Z SCREW 2.6mm x 6mm...
  • Page 62 KD-LH70R 3 7 63 1515 0 CD mechanism assembly and parts list Block No. Grease TN-2001-1013 TNG-87 GP-501MK CFD-005Z GP-501A L 13942296513 u163 http://www.xiaoyu163.com...
  • Page 63 KD-LH70R 3 7 63 1515 0 CD mechanism Block No. [M][B][M][M]  Symbol No. Part No. Part Name Description Local 30320101T FRAME 30320102T TOP COVER 30320115T DANPER F (x2) 30320116T DANPER R 303205505T CHASSIS RIVET 303205503T CHANGE P. RVT A...
  • Page 64 KD-LH70R 3 7 63 1515 0 Electrical parts list Main board Block No. [0][1][0][0]  Symbol No. Part No. Part Name Description Local  Symbol No. Part No. Part Name Description Local D714 SLR-56MC3F D721 UDZS11B-X Z DIODE IC31...
  • Page 65 KD-LH70R 3 7 63 1515 0  Symbol No.  Symbol No. Part No. Part Name Description Local Part No. Part Name Description Local C242 QERF1CM-226Z E CAPACITOR 22uF 16V M C909 QERF1AM-227Z E CAPACITOR 220uF 10V M C243...
  • Page 66 KD-LH70R 3 7 63 1515 0  Symbol No.  Symbol No. Part No. Part Name Description Local Part No. Part Name Description Local R251 NRSA63J-104X MG RESISTOR 100kΩ 1/16W J R767 NRSA63J-473X MG RESISTOR 47kΩ 1/16W J R252...
  • Page 67 KD-LH70R 3 7 63 1515 0  Symbol No.  Symbol No. Part No. Part Name Description Local Part No. Part Name Description Local D608 SML-310VT/JK/-X R646 NRS181J-102X MG RESISTOR 1kΩ 1/8W J D609 SML-310VT/JK/-X R650 NRSA63J-101X MG RESISTOR 100Ω...
  • Page 68 KD-LH70R 3 7 63 1515 0  Symbol No.  Symbol No. Part No. Part Name Description Local Part No. Part Name Description Local C505 NDC31HJ-270X C CAPACITOR 27pF 50V J C646 NCB31HK-103X C CAPACITOR 0.01uF 50V K C506...
  • Page 69 KD-LH70R 3 7 63 1515 0  Symbol No.  Symbol No. Part No. Part Name Description Local Part No. Part Name Description Local R549 NRSA63J-472X MG RESISTOR 4.7kΩ 1/16W J R656 NRSA63J-0R0X MG RESISTOR 0Ω 1/16W J R550...
  • Page 70 KD-LH70R 3 7 63 1515 0 Packing materials and accessories parts list Block No. Block No. L 13942296513 KIT: A11A12 u163 3-12 http://www.xiaoyu163.com...
  • Page 71 KD-LH70R 3 7 63 1515 0 Packing Accessories Block No. [M][3][M][M] Block No. [M][5][M][M]  Symbol No.  Symbol No. Part No. Part Name Description Local Part No. Part Name Description Local FSPG4002-001 POLY BAG (x2) GET0129-001A INST BOOK...