JVC KS-FX490 Service Manual
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JVC KS-FX490 Service Manual

JVC KS-FX490 Service Manual

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SERVICE MANUAL
5
2003
49845
1
Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3
Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4
Description of major ICs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
CASSETTE RECEIVER
KS-FX490
S
TABLE OF CONTENTS
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD.
Area Suffix
J ------ Northern America
No.49845
2003/5

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Summary of Contents for JVC KS-FX490

  • Page 1 SERVICE MANUAL CASSETTE RECEIVER 49845 2003 KS-FX490 Area Suffix J ------ Northern America TABLE OF CONTENTS Precautions ................3 Disassembly method .
  • Page 2 SPECIFICATION AUDIO AMPLIFIER Maximum Power Output Front 50 W per channel SECTION Rear 50 W per channel 19 W per channel into 4 Ω, 40 Hz to 20 000 Hz at no more Continuous Power Output (RMS) Front than 0.8 % total harmonic distortion. 19 W per channel into 4 Ω, 40 Hz to 20 000 Hz at no more Rear than 0.8 % total harmonic distortion.

  • Page 3: Precautions

    SECTION 1 Precautions 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. (No.49845)1-3...

  • Page 4: Disassembly Method

    SECTION 2 Disassembly method 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 Front panel assembly panel assembly and remove the front panel assembly in the direction of the arrow. Detach button Fig.1 2.1.2 Removing the bottom cover...
  • Page 5 2.1.4 Removing the heat sink (See Fig.5) • Prior to performing the following procedure, remove the front panel assembly. (1) Remove the two screws C and screw D attaching the heat sink on the left side of the main body, and remove the heat sink.
  • Page 6 2.1.7 Removing the cassette mechanism assembly (See Fig.8) • Prior to performing the following procedures, remove the front Cassette mechanism assembly panel assembly, bottom cover, front chassis assembly, heat sink, rear panel and main board. (1) Disconnect the wire from the connector CN402 on the mecha board.

  • Page 7: No.49845)1

    2.1.9 Removing the front board (See Figs.10 to 12) • Prior to performing the following procedures, remove the front panel assembly. Rear cover (1) Remove the four screws L attaching the rear cover on the back side of the front panel assembly. (See Fig.10.) (2) Release the nine joints g, the front panel assembly and rear cover become separate.
  • Page 8 Cassette mechanism assembly REFERENCE: Prior to performing the following procedures, turn the mode gear on the bottom of the body until the respective part comes to the EJECT position (Refer to Fig.1). Mode gear Fig.1 2.2.1 Removing the cassette guide (See Fig.2) (1) Turn the mode gear to set to RVS play or subsequent Cassette guide...
  • Page 9 2.2.3 Removing the cassette hanger assembly / cassette holder (See Fig.4 to 7) (1) Check the mode is set to EJECT. Push down the front part Cassette holder assembly of the cassette holder and move in the direction of the ar- row to release the joint c.
  • Page 10 2.2.4 Removing the side bracket assembly Side bracket assembly (See Fig.8 to 10) Joint i (1) Remove the screw A attaching the side bracket assembly. (2) Detach the front side of the side bracket assembly upward and pull out forward to release the joint i and j in the rear. Joint j CAUTION: When reassembling, make sure that the boss k of the...
  • Page 11 2.2.5 Removing the pinch arm (F) assembly (See Fig.11 and 12) (1) Remove the polywasher and pull out the pinch arm (F) as- sembly. (2) Remove the compulsion spring. 2.2.6 Removing the pinch arm (R) assembly (See Fig.11 and 12) (1) Remove the polywasher and pull out the pinch arm (R) as- sembly.
  • Page 12 2.2.8 Removing the head / tape guide Flywheel assembly (F) Belt (See Fig.16 and 17) REFERENCE: It is not necessary to remove the slide chassis assembly. (1) Remove the band attaching the wire to the head. (2) Remove the two screws B, the head and the head support spring.
  • Page 13 2.2.10 Disassembling the flywheel assembly (F) FFC pad (See Fig.19 and 20) (1) Push and turn counterclockwise the spring holder (F) to re- lease the three joints p on the bottom of the flywheel. (2) The spring holder (F), the TU spring and the friction gear play come off.
  • Page 14 2.2.13 Removing the gear base arm / gear base link assembly (See Fig.23 to 25) (1) Move the gear base arm in the direction of the arrow. Gear base arm (2) Insert a slotted screwdriver to the gear base spring under Joint t Joints s the gear base arm, and release the gear base arm upward...
  • Page 15 2.2.15 Removing the mode gear Mode gear Mode switch actuator (See Fig.26 and 29) (1) Remove the polywasher on the bottom and pull out the mode gear. 2.2.16 Removing the mode switch actuator (See Fig.26, 27 and 29) (1) Pull out the mode switch actuator at the bottom. REFERENCE: Polywasher When reattaching the mode switch actuator to the main...
  • Page 16 2.2.19 Removing the gear base assembly / take up gear / reflector gear (See Fig.30 to 32) (1) Push in the pin d’ of the gear base assembly on the upper Slot e' side of the body and move the reflector gear toward the bottom, then pull out.
  • Page 17 2.2.21 Removing the side bracket assembly Side bracket assembly (See Fig.33 to 37) Boss g' (1) Remove the eject cam plate spring. (2) Push the joint f’ through the slot to remove the load rack downward. (3) Move the eject cam limiter in the direction of the arrow to release it from the boss g’...
  • Page 18 2.2.22 Removing the main motor assembly / sub motor assembly (See Fig.38 to 40) (1) Remove the belt at the bottom. Main motor (2) Remove the polywasher and pull out the mode gear. assembly (3) Pull out the reduction gear (B). Reduction gear (B) (4) Remove the polywasher and pull out the reduction gear Belt...

  • Page 19: Adjustment

    SECTION 3 Adjustment Test instruments required for adjustment Standard volume position (1) Digital oscilloscope (100MHz) Balance and Bass, Treble volume, Fader : Center (Indication "0") (2) Frequency counter meter Loudness, Dolby NR, Sound, Cruise : Off (3) Electric voltmeter Volume position is about 2V at speaker output with following con- (4) Wow &...
  • Page 20 Information for using a car audio service jig (1) We're advancing efforts to make our extension cords common for all car audio products. Please use this type of extension cord as follows. (2) As a U-shape type top cover is employed, this type of extension cord is needed to check operation of the mechanism assembly after disassembly.
  • Page 21 Arrangement of adjusting & test points Cassette mechanism (Surface) Motor assembly Tape speed adjust Azimuth screw A (Forward) Playback head Azimuth screw B (Reverse) Head section view Playback head Azimuth screw B Azimuth screw A (Reverse) (Forward) (No.49845)1-21...
  • Page 22 Item Conditions Adjustment and Confirmation methods S.Values Adjust 1. Head Test tape: Head height adjustment azimuth SCC-1659 Adjust the azimuth directly. When you adjust the height A line adjustment VT703 (10kHz) using a mirror tape, remove the cassette housing from the mechanism chassis.

  • Page 23: Description Of Major Ics

    SECTION 4 Description of major ICs 4.1 AN80T05 (IC901) : Regulator • Pin layout & Block diagram Reference Voltage ASO & Peak Current Protection Thermal Protection Drive Drive Drive Drive Drive MODE2 MODE1 5.6V 8.7V 8.7V 8.7V • Pin function Pin No.
  • Page 24 4.2 CXA2560Q (IC401) : Dolby B type noise reduction system with play back equalizer amp. • Pin layout & Block diagram 7k/12k PBFB2 MSMODE 100k OFF/B PBRIN2 DRSW 300k MS MODE BIAS PBGND TAPESW MUTE PBFIN2 MUTESW TAPE EQ NRSW NR MODE FWD/RVS PBREF...
  • Page 25 4.3 HD74HC126FP-X (IC801) : Buffer • 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 Output Sample as Load Circuit 1 Output Sample as Load Circuit 1 Output Sample as Load Circuit 1 Note:...
  • Page 26 KIA7810PI (IC902) : Regulator • Pin layout 1 2 3 • Block diagram 1 INPUT 3 OUTPUT 2 GND 1-26 (No.49845)
  • Page 27 4.7 LC75873NW (IC601) : LCD Driver • Pin layout • Block diagram VDD1 COMON SEGMENT DRIVER DRIVER VDD2 CLOCK SHIFT REGISTOR GENERATOR ADDRESS DETECTOR • Pin function Pin No. Pin name Description 79,80 S1/P1 to S4/P4 O Segment outouts for displaying the display data transferred by serial data input. 1,2,3 S5 to S68 The S1/P1 to S4/P4 pins can be used as generalpurpose output ports under serial data control.
  • Page 28 LA47505 (IC301) : Power amp. • Block diagram Protective circuit Stand by Switch Ripple Mute Filter circuit protective circuit Muting & On Time Control Circuit 1-28 (No.49845)
  • Page 29 • Pin 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 GND2 Power GND OUTRR+...
  • Page 30 4.9 UPD178078GF-618 (IC701) : System CPU • Pin layout • Pin functions Pin No. Symbol Function PS1(on) ACC ON/OFF detection signal input PS2(stop) Memory ON/OFF detection signal input POWER POWER ON/OFF control output STAND BY Stand-by position detection signal input TAPE IN Cassette tape inside signal Not connect...
  • Page 31 Pin No. Symbol Function IF count input VDDPLL OSC INPUT FM/AM local osc input NO USE PLL disable & Pull down to GND GNDPLL Connect to ground AM E.OUT AM error output FM E.OUT FM error output IC(VPP) SETTING TO WRITE FOR FLASH RESET System reset input Not connect...
  • Page 32 4.10 TEA6320T-X (IC161) : E.volume • Pin layout OUTRR OUTLR OUTRF OUTLF Vref MUTE 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 TREBLE +20 to -31 dB VOLUME 2 LEFT...
  • Page 33 (No.49845)1-33...
  • Page 34 VICTOR COMPANY OF JAPAN, LIMITED AV & MULTIMEDIA COMPANY MOBILE ENTERTAINMENT CATEGORY 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan (No.49845) Printed in Japan...

  • Page 35: Parts List

    KS-FX490 PARTS LIST [ KS-FX490 ] * All printed circuit boards and its assemblies are not available as service parts. Area suffix J -------------- Northern America - Contents - Exploded view of general assembly and parts list (Block No.M1) Cassette mechanism assembly and parts list (Block No.MP) Electrical parts list (Block No.01~03)
  • Page 36 KS-FX490 Exploded view of general assmbly and parts list Block No.
  • Page 37 KS-FX490 General assembly Block No. [M][1][M][M] Symbol No. Part No. Part Name Description Local Symbol No. Part No. Part Name Description Local GE40107-002A HEAT SINK GE30912-002A REAR BRACKET -------------------- MECHA QYSDST2606Z SCREW 2.6mm x 6mm FSYH4036-050 SHEET QYSDSF2606Z SCREW 2.6mm x 6mm(x2)
  • Page 38 KS-FX490 Cassette mechanism assembly and parts list Block No. CDS-802JE3...
  • Page 39 KS-FX490 Cassette mechanism Block No. [M][P][M][M] Symbol No. Part No. Part Name Description Local Symbol No. Part No. Part Name Description Local 2-1031-7030-C2S SCREW (x2) X-0802-1009S MAIN CHASSIS AS X-0802-1002S SLIDE CHASSIS A X-0802-1003S SIDE BKT ASSY X-0802-1004S CASSETTE HANGER...
  • Page 40 KS-FX490 Grease point 1/2 FG-84M MEA-512R MEN-223 SW-902 CFD-409 CFD-250H EP-56 SW-474B...
  • Page 41 KS-FX490 Grease point 2/2...

  • Page 42: Electrical Parts List

    KS-FX490 Electrical parts list Main board Symbol No. Part No. Part Name Description Local Block No. [0][1][0][0] QERF1HM-104Z E CAPACITOR 0.1uF 50V M Symbol No. Part No. Part Name Description Local NCS31HJ-102X C CAPACITOR 1000pF 50V J QERF1AM-227Z E CAPACITOR...
  • Page 43 KS-FX490 Symbol No. Part No. Part Name Description Local Symbol No. Part No. Part Name Description Local C904 QERF1AM-227Z E CAPACITOR 220uF 10V M R708 NRSA63J-332X MG RESISTOR 3.3kΩ 1/16W J C905 QERF1CM-106Z E CAPACITOR 10uF 16V M R709 NRSA63J-332X MG RESISTOR 3.3kΩ...

  • Page 44: Front Board

    KS-FX490 Front board Symbol No. Part No. Part Name Description Local Block No. [0][2][0][0] R635 NRSA02J-182X MG RESISTOR 1.8kΩ 1/10W J Symbol No. Part No. Part Name Description Local R636 NRSA02J-182X MG RESISTOR 1.8kΩ 1/10W J R637 NRSA02J-122X MG RESISTOR 1.2kΩ...
  • Page 45 KS-FX490 Symbol No. Part No. Part Name Description Local C415 NCB31EK-103X C CAPACITOR 0.01uF 25V K C416 QFVD1HJ-104Z MF CAPACITOR 0.1uF 50V J C417 QFVD1HJ-104Z MF CAPACITOR 0.1uF 50V J C418 NDC31HJ-221X C CAPACITOR 220pF 50V J C419 QEKJ1HM-474Z E CAPACITOR 0.47uF 50V M...
  • Page 46 KS-FX490 Packing materials and accessories parts list Block No. A3 A4 A5 A6 A8 A9 A10 A11 3-12...
  • Page 47 KS-FX490 Packing and accessories Block No. [M][3][M][M] Symbol No. Part No. Part Name Description Local GET0120-001A INST BOOK ENG FRE SPA GET0120-002A INSTALL MANUAL ENG FRE SPA LVT0717-002B TROUBLE SHOOTIN BT-51018-3 WARRANTY CARD BT-52006-2 WARRANTY CARD BT-51028-2 J=REGIST CARD VKZ4027-202...

  • Page 48: Schematic Diagrams

    KS-FX490 SCHEMATIC DIAGRAMS CASSETTE RECEIVER KS-FX490 CD-ROM No.SML200305 Area Suffix J -------------- Northern America Contents Block diagram Standard schematic diagrams Printed circuit boards 2-5 to 7 No.49845SCH COPYRIGHT 2003 VICTOR COMPANY OF JAPAN, LTD. 2003/05...

  • Page 49: Safety Precaution

    KS-FX490 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.

  • Page 50: Block Diagram

    KS-FX490 Block diagram LINE OUT CJ321 TU.L FRONT LEFT TU.R FRONT RIGHT FM/AM REAR LEFT TUNER REAR RIGHT IC161 IC301 E.VOLUME POWER AMP TAPE.L OUTFL MONO PHOTO OUTFR TAPE.R SD/ST,SEEK PHOTO REEL OUTRL SUBMO+ S.METER IC402 OUTRR REEL SUBMO - MOTOR IFC.CONT...

  • Page 51: Standard Schematic Diagrams

    KS-FX490 KS-FX490 Standard schematic diagrams Main amp section CJ321 QNN0489-001 IC301 LA47505 C362 0.022 QAU0281-001 R333 R334 R323 R324 R353 R354 C361 A.GND QNB0100-002 2.7k 1/50 E.CLK 0.022 R343 R344 2.7k 1/50 E.DATA 4.7uH R331 C332 0.22 C313 IC161 C314 0.47/50...
  • Page 52 KS-FX490 LCD & Key control section LCD1 IC602 CN601 RPM6938-SV4 QNZ0006-001 ACC5V R660 REMOCON LCD1 QLD0257-001 EN601 R661 QSW0976-001 ENC2 LCDCE R662 3.3k LCDDA R663 3.3k ENC2 R653 R654 LCDCL R664 3.3k Main amp ENC1 KEY2 section R652 KEY1 CN701...
  • Page 53 KS-FX490 KS-FX490 Head amp section Q403 2SB1322/RS/-T R401 Q402 UN2211-X CN403 QGF1219F1-10S 0.015 C411 IC401 CXA2560Q R418 22/16 C409 R416 1.5M IC402 LB1641 C422 0.015 C410 C425 0.01 C424 CN401 QGB1214K1-18S TAPE SIGNAL Main amp section CP401...
  • Page 54 KS-FX490 Printed circuit boards Main board Forward side C901 IC901 CJ321 B402 CN901 D901 C315 B401 C302 B204 CP401 B102 C907 C905 B101 C902 B201 R901 C917 C314 B203 B151 B154 C912 C916 C352 C906 C904 C914 C332 C903 C162...
  • Page 55 KS-FX490 Main board Reverse side C901 CJ321 R914 IC901 R912 R913 R344 R354 B800 L901 CN901 D901 J801 C361 C302 R324 R334 C304 C315 B801 C362 Q321 Q331 R903 CP401 R901 C314 R902 C905 C913 D341 D908 D351 C906 D909...
  • Page 56 KS-FX490 Front board Forward side LCD1 S614 IC602 D620 D602 D603 D605 R614 S605 R604 D604 D601 D619 R603 R602 S604 S615 S613 D606 D616 D617 D610 D611 D613 D612 S603 D609 S608 D615 S609 S610 S611 S601 S612 D614...
  • Page 57 KS-FX490 VICTOR COMPANY OF JAPAN, LIMITED AV & MULTIMEDIA COMPANY 10-1,1Chome,Ohwatari-machi,Maebashi-city,371-8543,Japan Printed in Japan (No.49845SCH) 2003/05...

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