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JVC KD-LH7R Service Manual

Cd receiver
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Download this manual See also: Service Manual, Instruction Manual
SERVICE MANUAL
SOUND
U
R
SOURCE
F
D
VOL
VOL
Contents
Safety precaution
Preventing static electricity
Important for laser products
Disassembly method
Adjustment method
CD RECEIVER
KD-LH7R
1-2
1-3
1-4
1-5
1-20
COPYRIGHT
2002 VICTOR COMPANY OF JAPAN, LTD.
E ---- Continental Europe
EX ------- Central Europe
Flow of functional
operation unit TOC read
Maintenance of laser pickup
Replacement of laser pickup
Description of major ICs
KD-LH7R
Area Suffix
1-21
1-23
1-23
1-24
No.49724
Apr. 2002

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Summary of Contents for JVC KD-LH7R

  • Page 1 KD-LH7R SERVICE MANUAL CD RECEIVER KD-LH7R SOUND SOURCE Area Suffix E ---- Continental Europe EX ------- Central Europe Contents Safety precaution Flow of functional Preventing static electricity operation unit TOC read 1-21 Important for laser products Maintenance of laser pickup...

  • Page 2: Safety Precaution

    KD-LH7R 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 3: Preventing Static Electricity

    KD-LH7R 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. 1.1. Grounding to prevent damage by static electricity Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as DVD players.

  • Page 4: Important For Laser Products

    KD-LH7R Important for laser products 5.CAUTION : If safety switches malfunction, the laser is able 1.CLASS 1 LASER PRODUCT to function. 2.DANGER : Invisible laser radiation when open and inter lock 6.CAUTION : Use of controls, adjustments or performance of failed or defeated.

  • Page 5: Disassembly Method

    KD-LH7R Disassembly method Removing the front panel unit (See Fig.1) Press the release switch and remove the front panel unit in the direction of the arrow. Front panel unit Fig.1 Removing the front chassis (See Fig.2 ~ 4) Remove the two screws A attaching the front chassis.
  • Page 6 KD-LH7R Removing the bottom cover (See Fig.6) Joint d Prior to performing the following procedure, remove Bottom cover the front chassis and the heat sink. Turn the body upside down. Insert a screwdriver to the two joints d and two joints...
  • Page 7 KD-LH7R Removing the MP3 board (See Fig.9) Prior to performing the following procedure, remove the top cover. Disconnect the wire from connector CN601 on the MP3 board. Remove the five screws G and the MP3 board, CN601 releasing the joint g and h.
  • Page 8 KD-LH7R Removing the (LCD & key) control switch board (See Fig.11 ~ 13) Prior to performing the following procedure, remove the front panel assembly. Remove the four screws I attaching the rear cover on the back of the front panel assembly.

  • Page 9: Removing The Top Cover

    KD-LH7R < CD mechanism section > Removing the top cover (See Fig.1 and 2) Remove the two screws A on each side of the body. Top cover Joints a Lift the front side of the top cover and move the cover backward to release the two joints a.
  • Page 10 KD-LH7R Removing the DET switch (See Fig.3 and 6) Extend the two tabs c of the feed sw. holder and pull out the switch. DET switch Unsolder the DET switch wire if necessary. Connector board Removing the chassis unit (See Fig.7 and 8)
  • Page 11 KD-LH7R Removing the clamper assembly (See Fig.9 and 10) Prior to performing the following procedure, remove Clamper arm the top cover. spring Remove the clamper arm spring. Move the clamper assembly in the direction of the arrow to release the two joints d.

  • Page 12: Removing The Pickup Unit

    KD-LH7R Feed sw. holder Removing the pickup unit (See Fig.13 to 17) Joint f Prior to performing the following procedure, remove the top cover, the connector board and the chassis unit. Remove the screw D and pull out the pu. shaft holder from the shaft.
  • Page 13 KD-LH7R Removing the trigger arm (See Fig.18 and 19) Joint k Prior to performing the following procedure, remove the top cover, the connector board and the clamper unit. Trigger arm Turn the trigger arm in the direction of the arrow to release the joint k and pull out upward.
  • Page 14 KD-LH7R Joint a' Link plate Joint r Removing the select arm (L) / select lock Select arm (L) Joint z Select arm (R) arm (See Fig.21 and 22) Select lock arm Prior to performing the following procedure, remove the top plate assembly.
  • Page 15 KD-LH7R Link plate Joint r Joint a' Removing the select arm (R) / link plate Select arm (L) Joint z Select arm (R) (See Fig.21 and 22) Select lock arm Prior to performing the following procedure, remove the top plate assembly.
  • Page 16 KD-LH7R Roller guide Removing the loading roller assembly Washer (See Fig.27 to 29) Loading roller assembly Prior to performing the following procedure, remove the clamper assembly and the top plate assembly. Roller guide Push inward the loading roller assembly on the gear side and detach it upward from the slot of the joint d’...
  • Page 17 KD-LH7R Removing the loading gear (5), (6) and Loading gear bracket (7) (See Fig.31 and 32) Loading gear (6) Prior to performing the following procedure, remove the top cover, the chassis unit and the top plate assembly. Remove the screw J...
  • Page 18 KD-LH7R Removing the gears (See Fig.33 to 36) Prior to performing the following procedure, remove the top cover, the chassis unit, the top plate assembly and the pickup unit. Slot j' Pull out the feed gear. Slide plate Loading plate assembly...
  • Page 19 KD-LH7R Removing the turn table / spindle motor Turn table (See Fig.37 and 38) Prior to performing the following procedure, remove the top cover, the connector assembly and the chassis / clamper assembly. Remove the two screws K attaching the spindle motor assembly through the slot of the turn table on top of the body.

  • Page 20: Adjustment Method

    6. Digital tester MW 522kHz ~ 1620 kHz 7. Tracking offset meter LW 144kHz ~ 279kHz 8. Test Disc JVC :CTS-1000 9. Extension cable for check EXTSH002-22P 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 21: Flow Of Functional Operation Until Toc Read

    KD-LH7R 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 Microprocessor Microprocessor Disc inserted commands commands 3.3V...

  • Page 22: Feed Section

    KD-LH7R Feed Section Check CD 8V Is the voltage output at Is the wiring for IC621 Is 3.3V present at and 5V. IC621 pin "40" 5V or 0V? (56) ~ (64) correct? IC681 pin "20"? Check the vicinity of IC621.

  • Page 23: Maintenance Of Laser Pickup

    KD-LH7R 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 24: Description Of Major Ics

    KD-LH7R Description of major ICs BR24C01AFV-W-X (IC502) : EEPROM 1.Pin layout 2.Block diagram 1kbit EEPROM ARRAY 8bit 7bit SLAVE/WORD ADDRESS DATA 7bit ADDRESS REGISTER DECODER REGISTER START STOP CONTROL LOGIC HIGH VOLTAGE GEN. Vcc LEVEL DETECT 3.Pin function Pin name...
  • Page 25 KD-LH7R BR24C32F-X (IC771) : EEPROM 1. Pin layout 2. Pin function WPIN Symbol I/O Function Power supply. A0,A1,A2 No use connect to GND. Serial clock input. Serial data I/O of slave and word address. WPIN Write protect terminal. 3. Block diagram...
  • Page 26 KD-LH7R UPD784216AGC163 (IC701): SYSTEM CPU UPD784216AGC163(1/2) Symbol Function Pin No. Signal input of mechanism switch 2 detection Signal input of mechanism switch 3 detection Signal input of mechanism switch 4 detection REST Rest switch detection signal input Loading side motor control signal output...
  • Page 27 KD-LH7R UPD784216AGC163(2/2) Symbol Function Pin No. Non connect Non connect SD/ST Station detector and stereo signal input. It is H and there is a bureau.It is L and a stereo. Non connect MONO Monaural ON/OFF switch output. At the time of the MONO ON :H.
  • Page 28 KD-LH7R HA13164A(IC901):Regulator 1.Terminal layout 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 2.Block diagram 100u 0.1u MEMORY.IN ACC.IN BATT.DET Surge Protector 0.1u ACC5V BIAS 0.1u VDD5V ANT CTRL 0.1u CTRL SW5VOUT CD8V 0.1u 0.1u...
  • Page 29 KD-LH7R HD74HC126FP-X (IC801) : Buffer 1.Terminal layout 3.Pin function Input Output Note) H:High level L:Low level X:Irrelevant Z:Off(High-impedance) State a 3-state input 2.Block diagram Output Input Output Sample as Load Circuit 1 Output Sample as Load Circuit 1 Output Sample as Load Circuit 1...
  • Page 30 KD-LH7R HD74HCT126T-X : (IC503) Buffer 1.Terminal layout 3.Pin function OUTPUT INPUT H : High level L : Low level X : Irrelevant Off (Hhigh-impedance)state of a 3-stage output 2.Block diagram 1-30...
  • Page 31 KD-LH7R LC75873NW(IC601):LCD Driver 1.Pin layout 2.Block diagram VDD1 COMON SEGMENT DRIVER DRIVER VDD2 CLOCK SHIFT REGISTOR GENERATOR ADDRESS DETECTOR 3.Pin function Pin name Description Pin No. Dimmer function control output DIMMER H:Dimmer off L:Dimmer on Segment outouts for displaying the display data S1/P1 TO S4/P4 transferred by serial data input.
  • Page 32 KD-LH7R LA47503(IC301):Power amp. 1.Terminal layout Protective circuit Stand by Switch Ripple Mute Filter circuit protective circuit Muting & On Time Control Circuit 1-32...
  • Page 33 KD-LH7R 2.Terminal layout 3.Pin function LA47503 Pin No. Symbol Function Header of IC AC CONT1 Power GND Outpur(-) for front Rch OUTRR- Stand by input STBY Output (+) for front Rch OUTRR+ Power input Vcc1/2 Output (-) for rear Rch...
  • Page 34 KD-LH7R LA6579H-X (IC681) : 4-Channel bridge driver 1. 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 L : OFF...
  • Page 35 KD-LH7R 3.Pin function LA6579H-X Pin No. Symbol Function CH1 input AMP_inverted input VIN1-A 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 36 KD-LH7R PCM1716E-X (IC571) : D/A converter 1. Pin layout 2. 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 EXTR MC/DM1 Mode MD/DM0 ZERO Control...
  • Page 37 KD-LH7R SAA6579T-X(IC71):RDS detecter 1.Pin layout QUAL DATA Vref OSCO OSCI TEST SCOUT MODE 2.Block diagram ANTI- 57 kHz OSCILATOR QUALITY BIT RECONSTRUCTION ALIASING BANDPASS GENERATOR FILTER FILTER (8th ORDER) DIVIDER BIPHASE COSTAS LOOP CLOCKED DIFFERENTIAL VARIABLE AND SYMBOL COMPARATOR DECODER...
  • Page 38 KD-LH7R 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 20-bit BINARY COUNTER Resistor 1 22-bit...
  • Page 39 KD-LH7R UPD784225GK-623 (IC501) : CPU 1.Pin layout 2.Pin function Symbol Function Symbol Function Connect to TEMP detecter Non use TEMP Connect to GND Non use Connect to GND Non use Connect to GND DAC mode control latch AVSS DACML No use...

  • Page 40: Terminal Layout

    KD-LH7R TA2157FN-X(IC601):RF amp 1.Terminal layout 2.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 (0dB) Normal mode...
  • Page 41 KD-LH7R 3.Pin function TA2175FN-X 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 42 AD11 Interrupt General Flag SRAM I/F Timer Control Output Port AD12 I-Bus Address Calc. 2sets ERAM TESTP CROM XRAM YRAM 2k word 4k word 4k word 4k word VSSR Y-Pointer X-Pointer C-Pointer register register register Prog. VRAR Start X-Bus Switch Y-Bus register VDAR...
  • Page 43 KD-LH7R 3.Pin function(1/2) TC94A02F-005 Pin No. Symbol Function Hard reset input terminal(H:Normal operation L: Reset) /RESET Micon I/F mode select input terminal MiMD External SRAM address output 0 terminal External SRAM address output 1 terminal Micon I/F data input/output terminal...
  • Page 44 KD-LH7R 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 VSSP VCO GND...
  • Page 45 KD-LH7R W24L010AJ-12-X(IC653):SRAM 1.Terminal layout 2.Block diagram DECODER CODE ARRAY I/O1 CONTROL DATA I/O I/O8 3.Pin function Function Function Pin no. Symbol Pin no. Symbol Data inputs/output I/O4 Address inputs Data inputs/outputs I/O5 Address inputs Data inputs/outputs I/O6 Address inputs I/O7...
  • Page 46 KD-LH7R TC94A14FA(IC621):DSP&DAC 1.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 Micro- controller Sub code interface decoder TMAX 2.Pin function...
  • Page 47 KD-LH7R TC94A14FA Symbol Description EFM and PLCK phase difference signal output pin. TMAX 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 Inverted input pin for PLL LPF amp.
  • Page 48 KD-LH7R GP1UM261X (IC602) : Receiver 1. Pin layout 2. Block diagram Limiter B.P.F. Integrator Demodulator Comparator GND Vdd OUT IC-PST600M/G/-W (IC702) : System reset Vout NJM4565V-X(IC572):CD LPF Pin function A OUTPUT A-INPUT A+INPUT B+INPUT B-INPUT B OUTPUT 1-48...

  • Page 49: Pin Function

    KD-LH7R NJU7241F25-X(IC651) : Regulator 1. Pin layout & Block diagram Short current Protection Circuit NJU7241F33-X(IC504):Regulator Pin function TDA7404D-X(IC161):Carradio signal processor 1.Terminal layout 2.Block diagram Mono Fader Mono Fader Mono Fader Mono Fader Mono Fader Mono Fader Zero Cross Mono/Beep Beep...
  • Page 50 KD-LH7R VICTOR COMPANY OF JAPAN, LIMITED MOBILE ELECTRONICS DIVISION PERSONAL & MOBILE NETWORK BUSINESS UNIT. 10-1,1Chome,Ohwatari-machi,Maebashi-city,371-8543,Japan 200204 (No.49724...

  • Page 51: Parts List

    KD-LH7R PARTS LIST [ KD-LH7R ] * All printed circuit boards and its assemblies are not available as service parts. Area suffix E ----------- Continental Europe EX --------------- Central Europe - 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 52: Exploded View Of General Assembly And Parts List

    KD-LH7R Exploded view of general assembly and parts list Block No.
  • Page 53 KD-LH7R Parts list (General assembly) Block No. M1MM Item Parts number Parts name Q'ty Description Area --------------- CD MECHA 1 TN-2001-1003 QUQ105-2207AE FFC WIRE VYSH101-009 SPACER QYSDST2004Z SCREW GE10043-001A TOP CHASSIS GE40135-001A EARTH PLATE GE30568-003A SIDE PANEL GE30393-001A BOTTOM COVER...
  • Page 54 KD-LH7R Parts list (General assembly) Block No. M1MM Item Description Parts number Parts name Q'ty Area FSYH4036-069 SHEET GE30387-001A RIM LENS EJECT BUTTON GE30538-002A VKW3001-330 COMP.SPRING 1 EJECT BUTTON GE30547-001A DETACH BUTTON VKW3001-330 COMP.SPRING 1 DETACH BUTTON FSYH4036-081 SHEET VKZ4777-001...

  • Page 55: Cd Mechanism Assembly And Parts List

    KD-LH7R CD mechanism assembly and parts list Block No. TN-2001-1003 Grease TNG-87...

  • Page 56: Parts List (Cd Mechanism)

    KD-LH7R Parts list (CD mechanism) Block No. MBMM Item Parts number Parts name Q'ty Description Area 30320101T FRAME 30320102T TOP COVER 30320109T DAMPER F 30320110T DAMPER R 303205501T CHASSIS RIVET A 303205503T CHANGE P.RVT A 303205301T CLAMPER ASS'Y 303205304T SPINDLE MOTOR A...
  • Page 57 KD-LH7R Parts list (CD mechanism) Block No. MBMM Item Description Parts number Parts name Q'ty Area 30321103T LOADING GEAR 3 30321104T LOADING GEAR 4 LOADING GEAR 5 30321105T 30321106T LOADING GEAR 6 30321107T LOADING GEAR 7 30321111T ROLLER GUIDE 30321114T...
  • Page 58 KD-LH7R Electrical parts list (Main board) Block No. 01 Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area BZ841 QAN0002-001Z BUZZER C 304 NCS31HJ-391X C CAPACITOR QERF1CM-226Z E CAPACITOR 22MF 20% 16V C 305 QERF1EM-475Z E CAPACITOR 4.7MF 20% 25V...
  • Page 59 KD-LH7R Electrical parts list (Main board) Block No. 01 Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area C 912 NCB31HK-103X C CAPACITOR L 901 QQR0703-001 CHOKE COIL C 914 QERF1CM-107Z E CAPACITOR 100MF 20% 16V...
  • Page 60 KD-LH7R Block No. 01 Electrical parts list (Main board) Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area R 59 NRSA63J-473X MG RESISTOR R 732 NRSA63J-103X MG RESISTOR R 733 NRSA63J-103X MG RESISTOR R 71...
  • Page 61 KD-LH7R Electrical parts list (Sub board) Block No. 02 Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area C 501 NCB31AK-474X C CAPACITOR C 627 NCB31HK-103X C CAPACITOR C 502 NCB31HK-103X C CAPACITOR C 628...
  • Page 62 KD-LH7R Electrical parts list (Sub board) Block No. 02 Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area IC504 NJU7241F33-X R 542 NRSA63J-101X MG RESISTOR IC571 PCM1716E-X R 543 NRSA63J-0R0X MG RESISTOR IC572 NJM4565V-X R 544...
  • Page 63 KD-LH7R Electrical parts list (Sub board) Block No. 02 Item Parts number Parts name Remarks Area R 626 NRSA63J-474X MG RESISTOR R 627 NRSA63J-103X MG RESISTOR R 628 NRSA63J-225X MG RESISTOR R 629 NRSA63J-103X MG RESISTOR R 630 NRSA63J-101X MG RESISTOR...
  • Page 64 KD-LH7R Electrical parts list (Front board) Block No. 03 Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area C 601 NBE20JM-475X TS E CAPACITOR R 620 NRS181J-821X MG RESISTOR C 602 NCB31HK-103X C CAPACITOR R 621...
  • Page 65 KD-LH7R < M E M O > 3-15...

  • Page 66: Packing Materials And Accessories Parts List

    KD-LH7R Packing materials and accessories parts list Block No. Block No. E version A2~A7 EX version A1,A3,A5~A7 E version A1 KIT:A9~A13 3-16...
  • Page 67 KD-LH7R Parts list (Packing) Block No. M3MM Item Description Parts number Parts name Q'ty Area FSPG4002-001 POLY BAG 1 INST. BOOK FSPG4002-001 POLY BAG 2 INST. BOOK POLY BAG 1 KIT QPA00801205 QPA01003003 POLY BAG 1 HARD CASE FSYH4036-068 SHEET...

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