JVC KS-FX281 Service Manual Download Page 21 | Manualshive

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KS-FX281

2-1

A

B

C

D

E

F

G

1

2

3

4

5

Block diagram

HEAD

MAIN

MOTOR

MUTE SWITCH

TAPE/RADIO SW

TUL

LFO+
RFO+
LRO+
RRO+

LFO-
RFO-
LRO-
RRO-

LRO

LFO

LRO

CN901

KEY0 to 2

CJ701

F/R

SW4 to SW47
COM1 to COM3

CP701

TAPE L

LCH

F/R

LCH

CP901

CJ901

J1

FM

LINE REAR OUT

LCD & KEY CONTROL SECTION

HEAD AMP SECTION

CJ921

CP722

DIRECTION BOARD

AM

CP981

PROG-SW

ANT

IC981

POWER AMP.

IC931

E.VOLUME

IC901

HEAD AMPLIFIER

RELAY

BOARD

TO
SPEAKER
CONNECTOR

LCD1

IC651

LCD DRIVER

KEY

S601

to

S606

S608

to

S612

S614

to

S621

DATA
CLOCK
CE

IC701

SYSTEM CONTROL MICON

TU1

AM/FM TUNER PACK

SK/ST, MONO,
SD/ST, S METER,
FM OSC, EO, BAND
IFC/C

SDA
SCL

CN721

TAPE IN
PROG

MAIN AMP SECTION

CP721

TO
CD CHANGER

CP751

CD LCH

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Summary of Contents for KS-FX281

Page 1: ...o 49869 2003 10 CASSETTE RECEIVER 49869 2003 10 KS FX281 TABLE OF CONTENTS 1 PRECAUTION 1 3 2 SPECIFIC SERVICE INSTRUCTIONS 1 4 3 DISASSEMBLY 1 5 4 Adjustment 1 13 5 TROUBLESHOOTING 1 17 Area Suffix UF China SCM MO RND S BASS SEL AM FM DISP CH CD SSM 7 8 9 10 11 12 ...

Page 2: ...b m TUNER SECTION Frequency Range FM 87 5 MHz to 108 0 MHz AM 531 kHz to 1 602 kHz FM Tuner Usable Sensitivity 11 3 dBf 1 0 µV 75 Ω 50 dB Quieting Sensitivity 16 3 dBf 1 8 µV 75 Ω Alternate Channel Selectivity 400 kHz 65 dB Frequency Response 40 Hz to 15 000 Hz Stereo Separation 35 dB Capture Ratio 2 0 dB AM Tuner Sensitivity 20 µV Selectivity 35 dB CASSETTE DECK SECTION Wow Flutter 0 15 WRMS Fast...

Page 3: ...9 1 3 SECTION 1 PRECAUTION 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 4: ...1 4 No 49869 SECTION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS ...

Page 5: ... the right side and the joint c on the back of the body then remove the bottom cover from the body CAUTION When releasing the joint c using a screwdriver do not damage the board Fig 2 3 1 3 Removing the front chassis See Fig 3 Prior to performing the following procedure remove the front panel assembly and bottom cover 1 Remove the two screws A on each side of the body 2 Release the two joints d an...

Page 6: ...nt panel assembly and bottom cover 1 Remove the two screws D two screws E and three screws F attaching the rear panel on the back of the body Fig 5 3 1 6 Removing the main board See Fig 6 Prior to performing the following procedure remove the front panel assembly bottom cover front chassis heat sink and rear panel 1 Remove the two screws G attaching the main board on the top chassis 2 Disconnect t...

Page 7: ...lifier board 2 Remove the one screw J attaching the head amplifier board 3 Move the head amplifier board in the direction of the arrow to release the two joints f the head amplifier board can be removed Fig 8 3 1 9 Removing the relay board See Fig 9 Prior to performing the following procedure remove the front panel assembly bottom cover front chassis heat sink rear panel main board and cassette me...

Page 8: ...taching the mecha bracket Fig 10 3 1 11 Removing the switch LCD key board See Fig 11 to 13 Prior to performing the following procedure remove the front panel assembly 1 Remove the four screws M attaching the rear cover on the back of the front panel assembly 2 Release the eleven joints h the front panel and the rear cover become separate 3 Remove the switch board from the rear cover Fig 11 Fig 12 ...

Page 9: ...ove the direc tion switch board and the FF REW lever assembly 1 Remove the screw D attaching the playback head 2 Remove the C washer and pull out the FF roller 3 Remove the S support plate the A arm spring a and b the playback head ATTENTION The A arm spring a differs from the A arm spring b 3 2 5 Removing the pinch roller R and F assembly See Fig 2 Prior to performing the following procedure remo...

Page 10: ...y See Fig 4 Prior to performing the following procedure remove the FF REW lever assembly and the cassette hanger cassette hold er 1 Remove the C washer and pull out reel disc assembly ATTENTION Replace with a new C washer when reattaching Fig 4 3 2 8 Removing the motor assembly See Fig 5 1 Unsolder the two wires j on the motor assembly 2 Turn over the cassette mechanism assembly and remove the mai...

Page 11: ...he reel base assembly See Fig 5 and 6 1 Raise the part k of the reel base assembly slightly and re move the selector link B on the front side of the cassette mechanism assembly by turning it as shown in Fig 6 2 Remove the three screws E and the one screw F on the underside of the cassette mechanism assembly ATTENTION The reel base assembly is not repairable Handle with care Fig 6 Fig 7 Reel disc a...

Page 12: ...rd Fig 8 3 2 12 Removing the power switch See Fig 9 Prior to performing the following procedure remove the motor assembly 1 Unsolder the two wires m on the power switch on the side of the cassette mechanism assembly 2 Remove the screw I attaching the power switch Fig 9 Cassette mechanism assembly Soldering l H Mute switch board Rower switch Motor assembly Soldering m I Power switch Cassette mechan...

Page 13: ...dard volume position Balance and Bass Treble volume Fader Center Indication 0 Loudness Dolby NR Sound Cruise Off Volume position is about 2V at speaker output with following conditions Playback the test tape VT721 Measuring conditions Amplifier section Power supply voltage DC14 4V 11V to 16V allowance Load impedance 4Ω 4Ω to 8Ω allowance Line out level Impedance 2 0V 20k load 250 nWb m AM mode 999...

Page 14: ... Remove the heat sink 5 Remove the rear panel 6 Remove the main board 7 Reattach the heat sink with the two screws D Refer to DISASSEMBLY 8 Reattach the rear panel with the screw G Refer to DISASSEMBLY 9 Reattach the front chassis assembly with the screw B Refer to DISASSEMBLY 10 Reattach the front panel assembly 11 Confirm that current is being carried by connecting an extension cord jig NOTE Ava...

Page 15: ...g test points Playback head Head azimuth screw Fixed screw Height adjusting screw c Height adjusting screw b Height adjusting screw a Head section view Cassette mechanism Surface Tape speed adjust Motor assembly Playback head Azimuth screw ...

Page 16: ...de Adjust the Rch and Lch output levels to max with azimuth adjustment screw B In this case the phase difference should be within 45 3 Engage the reverse mode and adjust the output lev el to max with azimuth adjustment screw C The phase difference should be 45 or more 4 When switching between forward and reverse modes the difference between channels should be within 3dB Between FWD L and R REV L a...

Page 17: ... No 49869 1 17 SECTION 5 TROUBLESHOOTING This service manual does not describe TROUBLESHOOTING ...

Page 18: ... No 49869 AV MULTIMEDIA COMPANY MOBILE ENTERTAINMENT CATEGORY 10 1 1chome Ohwatari machi Maebashi city 371 8543 Japan VICTOR COMPANY OF JAPAN LIMITED WPC Printed in Japan ...

Page 19: ...H 2003 10 COPYRIGHT 2003 VICTOR COMPANY OF JAPAN LTD KS FX281 Area Suffix UF China Contents Block diagram Standard schematic diagrams Printed circuit boards 2 1 2 2 2 5 6 CD ROM No SML200310 SCM MO RND S BASS SEL AM FM DISP CH CD SSM 7 8 9 10 11 12 ...

Page 20: ...KS FX281 2 4 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 Safety precaution ...

Page 21: ...INE REAR OUT LCD KEY CONTROL SECTION HEAD AMP SECTION CJ921 CP722 DIRECTION BOARD AM CP981 PROG SW ANT IC981 POWER AMP IC931 E VOLUME IC901 HEAD AMPLIFIER RELAY BOARD TO SPEAKER CONNECTOR LCD1 IC651 LCD DRIVER KEY S601 to S606 S608 to S612 S614 to S621 DATA CLOCK CE IC701 SYSTEM CONTROL MICON TU1 AM FM TUNER PACK SK ST MONO SD ST S METER FM OSC EO BAND IFC C SDA SCL CN721 TAPE IN PROG MAIN AMP SEC...

Page 22: ...nal Front signal Rear signal CD changer signal Parts are safety assurance parts When replacing those parts make sure to use the specified one Standard schematic diagrams Main amp section To LCD key control section CP701 To Head amp section CP721 To Head amp section CP901 ...

Page 23: ...KS FX281 2 3 A B C D E F G 1 2 3 4 5 To Main amp section CJ701 LCD Key control section ...

Page 24: ...n CN901 Head amp section CP722 CP721 IC901 C203 C103 CJ901 R204 R104 C901 CP901 C201 C101 C202 C102 R203 R103 C204 C104 R201 R101 C205 C105 R901 QGA2002F1 06 QGB1214K1 06S UPC1228HA 100p 100p QGA2002C1 05 330k 330k QGB1214K1 06S 820p 820p 0 47 50 0 47 50 100 100 47 6 3 47 6 3 15k 15k 0 01 0 01 100 10 100 ...

Page 25: ...772 Q781 Q782 Q783 Q784 Q789 Q971 Q972 R1 R2 R3 R4 R5 R6 R7 R9 C786 R14 R15 R17 R51 R52 R972 R61 R62 R131 R132 R994 C942 R992 C940 R163 R164 R165 R231 R232 R993 C941 R991 C943 R263 R264 R265 Q989 R702 R703 CN901 R707 R708 R709 R710 R712 R713 R714 C709 R715 C710 R718 R719 R720 R721 R722 CJ921 R724 R725 R726 R727 R751 R752 R753 R754 R755 R756 R757 R758 R759 R760 R761 R762 R763 R764 R771 R772 R773 R7...

Page 26: ...615 R616 R617 S601 S606 S609 S610 S611 S612 S602 S603 S604 S608 S605 S614 S615 S616 S617 S618 S619 S620 LCD1 S621 R618 C651 C652 C653 C654 CP701 PL601 D652 D653 D654 D655 D657 IC651 IC652 R601 R604 R605 R607 R614 R635 R636 R637 R638 R639 R640 R641 R642 R643 R644 R645 R646 R647 R648 R649 R651 R652 R653 R654 R655 R656 R657 R658 PL603 CP901 IC901 C104 C204 R103 R203 C105 C205 C101 C201 R104 R204 C103...

Page 27: ...KS FX281 2 7 M E M O ...

Page 28: ... No 49869SCH Printed in Japan WPC VICTOR COMPANY OF JAPAN LIMITED AV MULTIMEDIA COMPANY MOBILE ENTERTAINMENT CATEGORY 10 1 1chome Ohwatari machi Maebashi city 371 8543 Japan ...

Page 29: ...ervice parts 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 Packing materials and accessories parts list Block No M3 KS FX281 3 2 3 4 3 8 3 12 Area suffix UF China 49869 ...

Page 30: ...list Main board B Front board Block No M M M 1 A B A 25 17 18 21 20 19 22 23 16 34 31 43 42 27 28 32 38 33 35 29 45 45 30 24 44 16 8 12 12 15 14 14 56 9 47 51 49 46 52 48 55 13 57 59 58 54 10 53 13 50 11 3 3 11 11 4 7 11 6 1 2 5 4 36 40 41 39 26 37 ...

Page 31: ... FRONT PANEL 25 GE30584 015A FINDER ASSY 26 FSJK3014 001 LIGHT LENS 27 GE20119 001A PRESET BUTTON 28 FSYH4036 077 SHEET 29 GE30304 001A POWER BUTTON 30 GE20131 331A D FUNC BUTTON 31 GE30307 001A SND FUNC BUTTON 32 FSYH4036 032 SHEET 33 GE20130 331A PUSH BUTTON 34 GE20120 001A UP DOWN BUTTON 35 GE20118 002A BUTTON 36 FSXP3066 001 FF BUTTON 37 FSXP3067 001 REW BUTTON 38 FSXP3065 001 EJECT BUTTON 39 ...

Page 32: ...4 72 30 66 109 120 89 57 2 123 96 23 69 61 47 31 119 45 46 109 67 58 118 106 5 6 8 3 110 25 68 61 19 109 20 22 62 83 76 71 107 121 53 107 21 78 79 35 97 1 117 7 77 105 116 93 114 115 50 48 82 101 95 117 85 15 80 16 86 87 106 26 94 122 38 106 37 107 41 39 44 63 109 54 42 70 107 9 74 117 4 43 73 40 10 ...

Page 33: ...036 3018S COLLER 57 1 0363 3007S HP ROLLER A 58 1 0363 3011S PROGRAM ROLLER 61 1 0036 4001S FF REW LEVER SP x2 62 1 0036 4002S LOCK LEVER SPG 63 1 0036 4003S GEAR LOCK ARM S 65 1 0036 4006S HEAD PLATE SPG 66 1 0036 4007S EJ CAM LOCK SPG 67 1 0036 4008S PROGRAM ARM SPG 68 1 0036 4010S ADJUST ARM SP A 69 1 0036 4011S ADJUST ARM SP B 70 1 0036 4015S DASH SPG 71 1 0036 4017S CHANGING ARM SP 72 1 0036 ...

Page 34: ...3 6 Grease point 1 2 FL 942 SW 902 SW 522B FG 84M C68 CFD 409 Grease Reverse side A 1 2 72 24 ...

Page 35: ...3 7 Grease point 2 2 12 35 5 30 20 19 3 16 38 42 43 4 39 37 15 ...

Page 36: ... J C235 QFV61HJ 823Z MF CAPACITOR 0 082uF 50V J C236 QFV61HJ 823Z MF CAPACITOR 0 082uF 50V J C237 QFVD1HJ 154Z MF CAPACITOR 0 15uF 50V J C238 QFVD1HJ 154Z MF CAPACITOR 0 15uF 50V J C250 QERF1HM 225Z E CAPACITOR 2 2uF 50V M C260 QERF1HM 225Z E CAPACITOR 2 2uF 50V M C701 QDUB1HJ 270Y C CAPACITOR 27pF 50V J C702 QDCB1HJ 220Y C CAPACITOR 22pF 50V J C703 QERF0JM 107Z E CAPACITOR 100uF 6 3V M C704 QFVD1...

Page 37: ...ESISTOR 12kΩ 1 4W J R931 QRE141J 100Y C RESISTOR 10Ω 1 4W J R941 QRE141J 332Y C RESISTOR 3 3kΩ 1 4W J R972 QRE141J 272Y C RESISTOR 2 7kΩ 1 4W J R973 QRE141J 472Y C RESISTOR 4 7kΩ 1 4W J R985 QRE141J 472Y C RESISTOR 4 7kΩ 1 4W J R990 QRE141J 103Y C RESISTOR 10kΩ 1 4W J R991 QRE141J 273Y C RESISTOR 27kΩ 1 4W J R992 QRE141J 273Y C RESISTOR 27kΩ 1 4W J R993 QRE141J 273Y C RESISTOR 27kΩ 1 4W J R994 QRE...

Page 38: ...16 NSW0124 001X TACT SW S617 NSW0124 001X TACT SW S618 NSW0124 001X TACT SW S619 NSW0124 001X TACT SW S620 NSW0124 001X TACT SW S621 NSW0124 001X TACT SW Symbol No Part No Part Name Description Local IC901 UPC1228HA IC Head amp C101 QDGB1HK 821Y C CAPACITOR 820pF 50V K C102 QEKJ1HM 474Z E CAPACITOR 0 47uF 50V M C103 QCBB1HK 101Y C CAPACITOR 100pF 50V K C104 QEKJ0JM 476Z E CAPACITOR 47uF 6 3V M C10...

Page 39: ...3 11 MEMO ...

Page 40: ...3 12 Packing materials and accessories parts list Block No M M M 3 A12 A13 A11 A1 A2 A3 A4 P1 P7 P2 P4 A10 P6 P5 KIT A5 A6 A7 A8 A9 P6 P3 ...

Page 41: ...MOUNT BOLT A 7 VKZ4328 001 LOCK NUT A 8 WNS5000Z WASHER A 9 GE40130 202A HOOK x2 A 10 FSJB3002 30C HARD CASE A 11 GE20137 203A MOUNTING SLEEVE A 12 GE20135 301A TRIM PLATE A 13 QAM0013 006 16P CORD ASSY KIT KSFX480K SCREW1 SCREW PARTS KIT A5 to A9 P 1 FSPG4002 001 POLY BAG P 2 QPA00801205 POLY BAG 8cm x 12cm P 3 QPA01003003 POLY BAG 10cm x 30cm P 4 FSYH4036 068 SHEET P 5 GE30982 001A CARTON P 6 GE...

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