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JVC KS-FX321 Service Manual
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JVC KS-FX321 Service Manual

Cassete receiver
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3 7 63 1515 0
SERVICE MANUAL
01
2003
49771
TE
L 13942296513
1
Important Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
2
Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
3
Adjustment method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
4
Description of major ICs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
www
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http://www.xiaoyu163.com
CASSETTE RECEIVER
KS-FX321
TABLE OF CONTENTS
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ao
u163
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i
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD.
http://www.xiaoyu163.com
2 9
8
S.BASS
Q Q
3
6 7
1 3
1 5
SEL
DISP
7
8
9
10
11
co
.
9 4
2 8
Area Suffix
U ---------- Other Areas
0 5
8
2 9
9 4
2 8
12
m
KS-FX321
9 9
9 9
No.49771
2003/01

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Summary of Contents for JVC KS-FX321

  • Page 1 KS-FX321 3 7 63 1515 0 SERVICE MANUAL CASSETTE RECEIVER 49771 2003 KS-FX321 Area Suffix U ---------- Other Areas S.BASS L 13942296513 DISP TABLE OF CONTENTS Important Safety Precautions ............1-2 Disassembly method .

  • Page 2: Important Safety Precautions

    KS-FX321 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: Disassembly Method

    KS-FX321 SECTION 2 3 7 63 1515 0 Disassembly method 2.1 Main body 2.1.1 Removing the front panel unit (See Fig.1) (1) Press the release switch and remove the front panel unit in Front panel assembly the direction of the arrow.
  • Page 4 KS-FX321 2.1.4 Removing the heat sink 3 7 63 1515 0 (See Fig.4) (1) Remove the four screws B attaching the heat sink on the left side of the body, and remove the heat sink. Heat sink Fig.4 2.1.5 Removing the rear panel (See Fig.5 )
  • Page 5 KS-FX321 2.1.7 Removing the cassette mechanism assembly 3 7 63 1515 0 (See Fig.7) • Prior to performing the following procedure, remove the front Cassette mechanism chassis, the heat sink, bottom cover and the main amplifier board assembly. (1) Remove the four screws F attaching the cassette mecha- nism assembly from the top cover.
  • Page 6 KS-FX321 2.1.9 Removing the chassis assembly 3 7 63 1515 0 (See Fig.9,10) • Prior to performing the following procedure, remove the front Relay board chassis, the bottom cover, the heat sink, the main board as- CP722 sembly , the cassette mechanism assembly and the head am- plifier board.
  • Page 7 KS-FX321 2.1.10 Removing the (LCD & key) control switch board 3 7 63 1515 0 (See Fig.11~13) • Prior to performing the following procedure, remove the front panel assembly. (1) Remove the four screws J attaching the rear cover on the back of the front panel assembly.
  • Page 8 KS-FX321 2.2 Cassette mechanism assembly 3 7 63 1515 0 • Prior to performing the following procedures, remove the head 2.2.4 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- 2.2.1 Removing the direction switch board...
  • Page 9 KS-FX321 2.2.6 Removing the cassette hanger / cassette holder 3 7 63 1515 0 Cassette holder (See Fig.3) Return link Joint i • Prior to performing the following procedure, remove the FF / Cassette hanger REW lever assembly. (1) From the rear of the unit, bend the two tabs f outwards and Eject lever disengage the two joints g in the direction of the arrow.
  • Page 10 KS-FX321 2.2.9 Removing the Flywheel (BF) and (BR) assembly 3 7 63 1515 0 2.2.10 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 11 KS-FX321 2.2.11 Removing the mute switch board 3 7 63 1515 0 Cassette mechanism assembly (See Fig.8) Rower switch (1) Unsolder the two wires l on the mute switch board on the Soldering l Motor assembly back of the cassette mechanism assembly.

  • Page 12: Adjustment Method

    KS-FX321 SECTION 3 3 7 63 1515 0 Adjustment method Test Instruments reqired for adjustment Standard volume position 1. Digital osclloscope(100MHz) Balance and Bass,Treble volume .Fader 2. Frequency Counter meter :Center(Indication"0") 3. Electric voltmeter Loudness,Dolby NR,Sound,Cruise:Off 4. Wow & flutter meter Volume position is about 2V at speaker output with 5.
  • Page 13 KS-FX321 3 7 63 1515 0 Arrangement of Adjusting & Test points Cassette mechanism (Surface) Motor assembly Tape speed adjust Playback head Azimuth screw Head section view L 13942296513 Head azimuth screw Fixed screw Playback head Height adjusting screw a...
  • Page 14 KS-FX321 3 7 63 1515 0 Mechanism adjustment section Item Adjusting & Confirmation Methods Adjust Std. Value 1. Head azimuth "Head Height Adjustment" Note Adjust the azimuth directly. When you adjust the height A Line using a mirror tape, remove the cassette housing from the mechanism chassis.

  • Page 15: Description Of Major Ics

    KS-FX321 SECTION 4 3 7 63 1515 0 Description of major ICs 4.1 LC75823W (IC651) : LCD driver • Pin Layout & Symbol 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49...
  • Page 16 KS-FX321 4.2 LC72362N-9B39 (IC701) : Micon 3 7 63 1515 0 • Pin layout 24 - 1 41 - 64 • Pin functions Symbol Function Symbol Function - Non connect I Crystal oscillator - Non connect - To GND...
  • Page 17 KS-FX321 4.3 AN80T05LF (IC781) : Regulator 3 7 63 1515 0 • 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 18 KS-FX321 4.5 LC75421M-X (IC931): E. volume 3 7 63 1515 0 • Pin layout • Block diagram L 13942296513 u163 1-18 (No.49771) http://www.xiaoyu163.com...
  • Page 19 KS-FX321 • Pin functions 3 7 63 1515 0 Pin No Symbol Function Serial data input terminal for control Chip enable terminal LROUT Rear Lch fader output terminal LFOUT Front Lch fader output terminal LFIN Front Lch input terminal LOUT C &...
  • Page 20 KS-FX321 4.6 LA4743K (IC981) : Power amp. 3 7 63 1515 0 • Block diagram 2200 F 0.022 F Vcc 1/2 Vcc 3/4 IN 1 OUT 1+ 0.22 F OUT 1- PWR GND1 Protective circuit OUT 2+ IN 2 OUT 2- 0.22 F...
  • Page 21 KS-FX321 • Terminal layout 3 7 63 1515 0 • Pin function Pin No. Symbol Function Header of IC Power GND Outpur(-) for front Rch STDBY Stand by input Output (+) for front Rch Power input Output (-) for rear Rch...
  • Page 22 KS-FX321 4.7 HD74HC126P (IC751) : Changer control 3 7 63 1515 0 • Pin arrangement • Pin function Input Output ( TOP VIEW ) • Block diagram L 13942296513 u163 1-22 (No.49771) http://www.xiaoyu163.com...
  • Page 23 KS-FX321 3 7 63 1515 0 L 13942296513 u163 (No.49771)1-23 http://www.xiaoyu163.com...
  • Page 24 KS-FX321 3 7 63 1515 0 L 13942296513 u163 VICTOR COMPANY OF JAPAN, LIMITED AV & MULTIMEDIA COMPANY 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan (No.49771) Printed in Japan 200301WPC http://www.xiaoyu163.com...

  • Page 25: Schematic Diagrams

    KS-FX321 3 7 63 1515 0 SCHEMATIC DIAGRAMS CASSETTE RECEIVER KS-FX321 CD-ROM No.SML200301 S.BASS L 13942296513 DISP Area Suffix UN ------------------------ Asean U ------------------ Other Areas Contents Block diagram Standard schematic diagrams Printed circuit boards 2-5,6 u163 No.49771SCH COPYRIGHT 2003 VICTOR COMPANY OF JAPAN, LTD.
  • Page 26 KS-FX321 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. L 13942296513 u163 http://www.xiaoyu163.com...
  • Page 27 KS-FX321 3 7 6 3 1 5 1 5 0 Block diagram DIRECTION BOARD CP722 MAIN MOTOR RELAY BOARD HEAD MUTE SWITCH CP721 TAPE/RADIO SW PROG-SW SPEAKER CONNECTOR LINE REAR OUT CN721 CP981 CJ901 CJ921 Lch Front Lch Rear...
  • Page 28 KS-FX321 KS-FX321 3 7 6 3 1 5 1 5 0 Standard schematic diagrams Main amp section QAU0281-001 Q989 KRA102M-T QNZ0009-001 ACC.MUTE Q972 KRA102M-T 1SS119-041 D973 MUTE2 CJ921 QNN0519-001 R163 4.7uH R164 D161 R165 1SS119-041 2.2K D261 R265 MUTE...
  • Page 29 KS-FX321 3 7 6 3 1 5 1 5 0 LCD & Key control section Main amp section CJ701 VMC0335-001 CP701 1 3 9 4 2 2 9 6 5 1 3 D655 MA152WK-X COM1 R651 COM2 1.5k COM3 C651 0.01...
  • Page 30 KS-FX321 KS-FX321 3 7 6 3 1 5 1 5 0 Head amp section CJ901 QGA2002C1-05 IC901 UPC1228HA 1 3 9 4 2 2 9 6 5 1 3 C103 C203 R104 R204 330k 330k 100p 100p TAPE SIGNAL...
  • Page 31 KS-FX321 3 7 63 1515 0 Printed circuit boards 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...
  • Page 32 KS-FX321 3 7 63 1515 0 Front board D601 Forward side S621 S601 R611 D606 D616 R618 S604 D619 R617 S620 S603 S608 D605 D617 R603 R616 R602 S602 R615 S618 S605 D604 D620 D618 LCD1 S619 D608 S606...
  • Page 33 KS-FX321 3 7 63 1515 0 < M E M O > L 13942296513 u163 http://www.xiaoyu163.com...
  • Page 34 KS-FX321 3 7 63 1515 0 L 13942296513 u163 VICTOR COMPANY OF JAPAN, LIMITED AV & MULTIMEDIA COMPANY 10-1,1Chome,Ohwatari-machi,Maebashi-city,371-8543,Japan Printed in Japan (No.49771SCH) 2003/01 http://www.xiaoyu163.com...

  • Page 35: Parts List

    KS-FX321 3 7 63 1515 0 PARTS LIST [ KS-FX321 ] * All printed circuit boards and its assemblies are not available as service parts. Area suffix U --------------------- Other Areas UN --------------------------- Asean L 13942296513 - Contents - 3- 2 Exploded view of general assembly and parts list (Block No.M1)
  • Page 36 KS-FX321 3 7 63 1515 0 L 13942296513 u163 http://www.xiaoyu163.com...
  • Page 37 KS-FX321 3 7 63 1515 0 Parts list (Genereal assembly) Block No. M1MM Item Parts number Parts name Q'ty Description Area ----------------------- CDS-363SJ1 VKL7821-001 EJECT LEVER QYSPSPT2625Z MINI SCREW QYSDSP2604Z SCREW 4 MECHA+M.BKT QYSDST2605Z SCREW 2 PCB+MECHA MECHA BRACKET...
  • Page 38 KS-FX321 3 7 63 1515 0 Parts list (Genereal assembly) Block No. M1MM Item Parts number Parts name Q'ty Description Area GE30621-001A NAME PLATE QNZ0440-001 RUBBER CONNECTOR IC BRACKET GE40136-001A QMFZ047-150-T FUSE GE30382-013A REAR BRACKET QYSDST2606Z SCREW 1 REAR BKT+ANT JA...
  • Page 39 KS-FX321 3 7 63 1515 0 Cassette mechanism assembly and parts list Block No. CDS-363SJ1 L 13942296513 u163 http://www.xiaoyu163.com...
  • Page 40 KS-FX321 3 7 63 1515 0 Parts list (Casstte mechanism) Block No. MPMM Item Description Parts number Parts name Q'ty Area X-0363-1001S MAIN CHASSIS AS X-0363-1002S HEAD PLATE ASSY X-0363-1004S FR CONV ARM (A) X-0363-6001S REEL BASE ASSY LEVER BRKT ASSY...
  • Page 41 MOTOR ASSY 1-0363-7001S MUTE SW 1-0363-7002S SLIDE SW 1-0363-7008S SLIDE SW PWB L 13942296513 1-0036-7016S HEAD 1-0363-7005S POWER SW 1-0036-7089S 6P WIRE ASY(JVC 5P WIRE ASY(JVC 1-0036-7088S 2-1816-0032-E8S MYLAR WASHER(S) 2-1812-0030-D2S POLY WASHER(S) 1-0036-5024S PSW(REEL) 2-1712-0050-16S E RING 2-1712-5060-16S E RING...
  • Page 42 KS-FX321 3 7 63 1515 0 Grease point 1/2 Grease FL-942 SW-902 SW-522B FG-84M CFD-409 Reverse side L 13942296513 u163 http://www.xiaoyu163.com...
  • Page 43 KS-FX321 3 7 63 1515 0 Grease point 2/2 L 13942296513 u163 http://www.xiaoyu163.com...
  • Page 44 KS-FX321 3 7 63 1515 0 Electrical parts list (Main board) Block No. 01 Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area QDX11EK-223Z C CAPACITOR C 985 QERF1EM-475Z E CAPACITOR 4.7MF 20% 25V...
  • Page 45 KS-FX321 3 7 63 1515 0 Electrical parts list (Main board) Block No. 01 Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area Q 261 2SD2144S/VW/-T TRANSISTOR REAR R 757 QRE141J-473Y C RESISTOR 47K 5% 1/4W...
  • Page 46 KS-FX321 3 7 63 1515 0 Electrical parts list (Mecha board) Block No. 02 Item Parts number Parts name Remarks Area C 101 QDGB1HK-821Y C CAPACITOR C 102 QEKJ1HM-474Z E CAPACITOR .47MF 20% 50V C 103 QCBB1HK-101Y C CAPACITOR...
  • Page 47 KS-FX321 3 7 63 1515 0 Electrical parts list (Front board) Block No. 03 Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area C 651 NCB31EK-103X C CAPACITOR S 604 NSW0124-001X TACT SW C 652...
  • Page 48 KS-FX321 3 7 63 1515 0 Packing materials and accessories parts list Block No. Block No. L 13942296513 A1,A2 KIT : A3~A7 u163 3-14 http://www.xiaoyu163.com...
  • Page 49 KS-FX321 3 7 63 1515 0 Parts list (Packing) Block No. M3MM Item Description Parts number Parts name Q'ty Area POLY BAG 1 INST.BOOK FSPG4002-001 QPA00801205 POLY BAG QPA01003003 POLY BAG FSYH4036-068 SHEET GE30622-001A PACKING CASE GE10047-001A EPS CUSHION...