JVC KS-FX281 Service Manual
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JVC KS-FX281 Service Manual

JVC KS-FX281 Service Manual

Car cassette receiver
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SERVICE MANUAL
10
2003
49869
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
4
Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
5
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LIMITED
CASSETTE RECEIVER
KS-FX281
S.BASS
SEL
DISP
7

TABLE OF CONTENTS

Area Suffix
UF ---------------------------- China
8
9
10
11
12
MO/RND
SCM
FM
AM
SSM
CD
CH
No.49869
2003/10

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  • Page 1: Table Of Contents

    SERVICE MANUAL CASSETTE RECEIVER 49869 2003 KS-FX281 Area Suffix UF ---------------------------- China S.BASS DISP MO/RND TABLE OF CONTENTS PRECAUTION............... . . 1-3 SPECIFIC SERVICE INSTRUCTIONS .
  • Page 2 SPECIFICATION AUDIO AMPLIFIER SECTION Maximum Power Output Front 45 W per channel Rear 45 W per channel 17 W per channel into 4 Ω 40 Hz to 20 000 Hz Continuous Power Output (RMS) Front at no more than 0.8% total harmonic distortion. 17 W per channel into 4 Ω...

  • Page 3: Precaution

    SECTION 1 PRECAUTION 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.49869)1-3...

  • Page 4: Specific Service Instructions

    SECTION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS. 1-4 (No.49869)

  • Page 5: Disassembly

    SECTION 3 DISASSEMBLY Main body 3.1.1 Removing the front panel assembly (See Fig.1) (1) Press the release button and remove the front panel assembly. Front panel assembly Release button Fig.1 3.1.2 Removing the bottom cover (See Fig.2) • Prior to performing the following procedure, remove the front panel assembly.
  • Page 6 3.1.4 Removing the heat sink (See Fig.4) • Prior to performing the following procedure, remove the front panel assembly. (1) Remove the screw B and two screws C attaching the heat sink on the left side of the body, and remove the heat sink. Heat sink Fig.4 3.1.5 Removing the rear panel...
  • Page 7 3.1.7 Removing the cassette mechanism assembly (See Fig.7) • Prior to performing the following procedure, remove the front panel assembly, bottom cover, front chassis, heat sink, rear Cassette mechanism assembly panel and main board. (1) Remove the four screws H attaching the cassette mecha- nism assembly from the top chassis.
  • Page 8 3.1.10 Removing the mecha bracket (See Fig.10) Mecha bracket • Prior to performing the following procedure, remove the front panel assembly, bottom cover, front chassis, heat sink, rear panel, main board, cassette mechanism assembly, head am- plifier board and relay board. (1) Remove the four screws L attaching the mecha bracket.
  • Page 9 Cassette mechanism assembly • Prior to performing the following procedures, remove the head 3.2.4 Removing the playback head amplifier board, the relay board and the mechanism bracket. (See Fig.2) • Prior to performing the following procedure, remove the direc- 3.2.1 Removing the direction switch board tion switch board and the FF / REW lever assembly.
  • Page 10 3.2.6 Removing the cassette hanger / cassette holder Cassette holder Return link (See Fig.3) Joint i • Prior to performing the following procedure, remove the FF / Cassette hanger REW lever assembly. Eject lever (1) From the rear of the unit, bend the two tabs f outwards and disengage the two joints g in the direction of the arrow.
  • Page 11 3.2.9 Removing the Flywheel (BF) and (BR) assembly 3.2.10 Removing the reel base assembly (See Fig.4 and 5) (See Fig.5 and 6) • Prior to performing the following procedure, remove the cas- (1) Raise the part k of the reel base assembly slightly and re- sette hanger / cassette holder.
  • Page 12 3.2.11 Removing the mute switch board (See Fig.8) Cassette mechanism assembly Rower switch (1) Unsolder the two wires l on the mute switch board on the back of the cassette mechanism assembly. Soldering l Motor assembly (2) Remove the screw H attaching the mute switch board. switch board Mute Fig.8...

  • Page 13: Adjustment

    SECTION 4 Adjustment Adjustment method 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 (4) Wow &...
  • Page 14 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 15 Arrangement of adjusting & test points Cassette mechanism (Surface) Motor assembly Tape speed adjust Playback head Azimuth screw Head section view Head azimuth screw Fixed screw Playback head Height adjusting screw a Height adjusting screw c Height adjusting screw b (No.49869)1-15...
  • Page 16 Item Conditions Adjustment and Confirmation methods S.Values Adjust 1. Head azi- Test tape: Head height adjustment muth adjust- SCC-1659 Adjust the azimuth directly. When you adjust the height A line ment VT703 (10kHz) using a mirror tape, remove the cassette housing from the mechanism chassis.

  • Page 17: Troubleshooting

    SECTION 5 TROUBLESHOOTING This service manual does not describe TROUBLESHOOTING. (No.49869)1-17...
  • Page 18 VICTOR COMPANY OF JAPAN, LIMITED AV & MULTIMEDIA COMPANY MOBILE ENTERTAINMENT CATEGORY 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan (No.49869) Printed in Japan...

  • Page 19: Schematic Diagrams

    SCHEMATIC DIAGRAMS CASSETTE RECEIVER KS-FX281 CD-ROM No.SML200310 Area Suffix UF ---------------------------- China S.BASS DISP MO/RND Contents Block diagram Standard schematic diagrams Printed circuit boards 2-5,6 No.49869SCH COPYRIGHT 2003 VICTOR COMPANY OF JAPAN, LTD. 2003/10...

  • Page 20: Safety Precaution

    KS-FX281 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 21: Block Diagram

    KS-FX281 Block diagram DIRECTION BOARD CP722 MAIN MOTOR RELAY BOARD HEAD MUTE SWITCH CP721 TAPE/RADIO SW PROG-SW SPEAKER CONNECTOR LINE REAR OUT CJ901 CN721 CP981 CJ921 LFO+ LFO- RFO+ RFO- LRO+ LRO- RRO+ RRO- IC981 POWER AMP. IC901 HEAD AMPLIFIER...

  • Page 22: Standard Schematic Diagrams

    KS-FX281 KS-FX281 Standard schematic diagrams Main amp section Tuner signal TAPE signal Front signal Rear signal CD changer signal Parts are safety assurance parts. When replacing those parts make sure to use the specified one.
  • Page 23 KS-FX281 LCD & Key control section Main amp section CJ701...
  • Page 24 KS-FX281 KS-FX281 Head amp section CJ901 QGA2002C1-05 IC901 UPC1228HA C203 C103 R204 R104 330k 330k 100p 100p CP722 QGA2002F1-06 C901 TAPE signal CP721 QGB1214K1-06S CP901 QGB1214K1-06S Main amp section CN721 Main amp section CN901...
  • Page 25 KS-FX281 Printed circuit board Main board CP981 L981 C981 CJ921 D981 CP751 CN901 R787 C986 C983 C132 D771 C133 C940 C931 R771 C997 R721 C942 C996 R941 C933 R722 C934 R992 C250 C231 C941 R997 C994 R231 R991 C975 C232...
  • Page 26 KS-FX281 Front board Forward side D601 S621 S601 R611 D606 D616 R618 D619 S604 R617 S620 S603 S608 D605 D617 R603 R616 R602 S602 R615 S618 S605 D604 D620 D618 S619 LCD1 D608 S606 D615 D610 D614 S610 S609 S611...
  • Page 27 KS-FX281 < M E M O >...
  • Page 28 VICTOR COMPANY OF JAPAN, LIMITED AV & MULTIMEDIA COMPANY MOBILE ENTERTAINMENT CATEGORY 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan Printed in Japan (No.49869SCH)

  • Page 29: Parts List

    PARTS LIST [ KS-FX281 ] * All printed circuit boards and its assemblies are not available as service parts. Area suffix UF ----------------------------China - Contents - 3- 2 Exploded view of general assembly and parts list (Block No.M1) 3- 4 Cassette mechanism assembly and parts list (Block No.MP)
  • Page 30 Exploded view of general assmbly and parts list...
  • Page 31 General assembly Block No. [M][1][M][M]  Symbol No. Part No. Part Name Description Local GE40203-002A EJECT LEVER QYSPSPT2625Z MINI SCREW 2.6mm x 2.5mm QYSDSP2604Z SCREW 2.6mm x 4mm(x4) QYSDST2605Z SCREW 2.6mm x 5mm(x2) GE20134-202A MECHA BKT GE10043-312A TOP CHASSIS GE40135-201A EARTH PLATE GE30938-203A SIDE PANEL...
  • Page 32 Cassette mechanism assembly and parts list Block No. CDS-363SJ2...
  • Page 33 Cassette mechanism  Symbol No. Part No. Part Name Description Local Block No. [M][P][M][M] 1-0036-7089S 6P WIRE ASY(JVC  Symbol No. Part No. Part Name Description Local 1-0036-7088S 5P WIRE ASY(JVC 2-1816-0032-E8S MYLAR WASHER(S) (x2) 2-1812-0030-D2S PSW-S (x3) X-0363-1001-2S MAIN CHASSIS ASSY...
  • Page 34 Grease point 1/2 Grease FL-942 SW-902 SW-522B FG-84M CFD-409 Reverse side...
  • Page 35 Grease point 2/2...

  • Page 36: Electrical Parts List

    Electrical parts list Main board  Symbol No. Part No. Part Name Description Local Block No. [0][1][0][0] C135 QFV61HJ-823Z MF CAPACITOR 0.082uF 50V J  Symbol No. Part No. Part Name Description Local C136 QFVD1HJ-154Z MF CAPACITOR 0.15uF 50V J C137 QFVD1HJ-154Z MF CAPACITOR...

  • Page 37: Front Board

     Symbol No.  Symbol No. Part No. Part Name Description Local Part No. Part Name Description Local QRE141J-471Y C RESISTOR 470Ω 1/4W J R999 QRE141J-473Y C RESISTOR 47kΩ 1/4W J QRE141J-752Y C RESISTOR 7.5kΩ 1/4W J QRE141J-471Y C RESISTOR 470Ω...
  • Page 38  Symbol No. Part No. Part Name Description Local R644 NRSA02J-621X MG RESISTOR 620Ω 1/10W J R645 NRSA02J-621X MG RESISTOR 620Ω 1/10W J R646 NRSA02J-821X MG RESISTOR 820Ω 1/10W J R647 NRSA02J-821X MG RESISTOR 820Ω 1/10W J R648 NRSA02J-102X MG RESISTOR 1kΩ...
  • Page 39 <MEMO> 3-11...
  • Page 40 Packing materials and accessories parts list Block No. A1,A2,A3,A4 A5,A6,A7 KIT: A8,A9 3-12...
  • Page 41 Packing and accessories Block No. [M][3][M][M]  Symbol No. Part No. Part Name Description Local GET0168-001A INST BOOK CHI(PEKIN) GET0168-002A INSTALL MANUAL BT-59019-1 WARRANTY CARD BT-59012-1C SVC CTR LIST VKZ4027-202 PLUG NUT VKH4871-001SS MOUNT BOLT VKZ4328-001 LOCK NUT WNS5000Z WASHER GE40130-202A HOOK (x2)

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