JVC KS-FX921 Service Manual
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JVC KS-FX921 Service Manual

JVC KS-FX921 Service Manual

Cassette receiver
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SERVICE MANUAL
6
2003
49846
1
Precaution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2
Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
3
Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19
4
Description of major ICs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LIMITED
ATT
SOUND
U
R
SOURCE
F
D
VOL
VOL
TABLE OF CONTENTS
U --------------------- Other Areas
No.49846
2003/5

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Summary of Contents for JVC KS-FX921

  • Page 1 SERVICE MANUAL CASSETTE RECEIVER 49846 2003 KS-FX921 SOUND SOURCE Area Suffix U --------------------- Other Areas TABLE OF CONTENTS Precaution ................1-3 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 Continuous Power Output (RMS) Front 20 000 Hz at no more than 0.8% total harmonic distortion.
  • Page 3 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.49846)1-3...
  • Page 4 SECTION 2 Disassembly method Main body 2.1.1 Removing the front panel assembly (See Fig.1) (1) Press the release button and remove the front panel as- Front panel assembly sembly. Release button Fig.1 2.1.2 Removing the bottom cover (See Fig.2) • Prior to performing the following procedures, remove the front panel assembly.
  • 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 panel assembly, bottom cover, front chassis assembly, heat Cassette mechanism assembly sink, rear panel and main board. (1) Disconnect the wire from the connector CN402 on the mecha board.
  • Page 7 2.1.9 Removing the front board (See Figs.10 to 12) • Prior to performing the following procedures, remove the front panel assembly. (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: Parts List

    KS-FX921 PARTS LIST [ KS-FX921 ] * All printed circuit boards and its assemblies are not available as service parts. Area suffix U --------------------- Other Areas - 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 20 KS-FX921 Exploded view of general assmbly and parts list Block No.
  • Page 21 KS-FX921 General assembly Block No. [M][1][M][M] Symbol No. Part No. Part Name Description Local Symbol No. Part No. Part Name Description Local GE30912-002A REAR BRACKET QYSDST2606Z SCREW 2.6mm x 6mm FSYH4036-050 SHEET QYSDSF2606Z SCREW 2.6mm x 6mm(x2) GE20136-001A MECHA BKT(L)
  • Page 22 KS-FX921 Cassette mechanism assembly and parts list Block No. CDS-802JE3...
  • Page 23 KS-FX921 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 24 KS-FX921 Grease point 1/2 FG-84M MEA-512R MEN-223 SW-902 CFD-409 CFD-250H EP-56 SW-474B...
  • Page 25 KS-FX921 Grease point 2/2...

  • Page 26: Electrical Parts List

    KS-FX921 Electrical parts list Main board Symbol No. Part No. Part Name Description Local Block No. [0][1][0][0] Symbol No. Part No. Part Name Description Local QERF1CM-106Z E CAPACITOR 10uF 16V M QERF1CM-106Z E CAPACITOR 10uF 16V M NCB31EK-223X C CAPACITOR 0.022uF 25V K...
  • Page 27 KS-FX921 Symbol No. Part No. Part Name Description Local Symbol No. Part No. Part Name Description Local C781 QERF1AM-227Z E CAPACITOR 220uF 10V M R351 NRSA63J-273X MG RESISTOR 27kΩ 1/16W J C782 QERF1CM-476Z E CAPACITOR 47uF 16V M R353 NRSA02J-102X MG RESISTOR 1kΩ...

  • Page 28: Front Board

    KS-FX921 Symbol No. Part No. Part Name Description Local Symbol No. Part No. Part Name Description Local L902 QQL244J-470Z COIL 47uH J R605 NRSA63J-272X MG RESISTOR 2.7kΩ 1/16W J R606 NRSA63J-392X MG RESISTOR 3.9kΩ 1/16W J CJ321 QNN0490-001 PIN JACK...
  • Page 29 KS-FX921 Mecha control board Block No. [0][3][0][0] Symbol No. Part No. Part Name Description Local IC401 CXA2560Q IC402 LB1641 Q402 UN2211-X TRANSISTOR Q403 2SB1322/RS/-T TRANSISTOR D401 MA3047/H/-X Z DIODE D402 1A3G-T1 SI DIODE C401 NDC31HJ-101X C CAPACITOR 100pF 50V J...
  • Page 30 KS-FX921 Packing materials and accessories parts list Block No. A3 A4 3-12...
  • Page 31 KS-FX921 Packing and accessories Block No. [M][3][M][M] Symbol No. Part No. Part Name Description Local GET0128-001A INST BOOK ENG ARA CHI THA GET0128-002A INSTALL MANUAL ENG ARA CHI THA VKZ4027-202 PLUG NUT VKH4871-001SS MOUNT BOLT VKZ4328-001 LOCK NUT WNS5000Z WASHER...

  • Page 32: Schematic Diagrams

    KS-FX921 SCHEMATIC DIAGRAMS CASSETTE RECEIVER KS-FX921 CD-ROM No.SML200305 SOUND SOURCE Area Suffix U --------------------- Other Areas Contents Block diagram Standard schematic diagrams Printed circuit boards 2-5 to 7 No.49846SCH COPYRIGHT 2003 VICTOR COMPANY OF JAPAN, LTD. 2003/05...

  • Page 33: Safety Precaution

    KS-FX921 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 34: Block Diagram

    KS-FX921 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 OUTLF MONO PHOTO OUTRF TAPE.R SD/ST PHOTO REEL OUTLR SUBMO+ S.METER IC402 OUTRR REEL SUBMO -...

  • Page 35: Standard Schematic Diagrams

    KS-FX921 KS-FX921 Standard schematic diagrams Main amp section CJ321 QNN0490-001 IC301 LA47505 C362 0.022 QAU0281-001 R333 R334 R323 R324 R353 R354 C361 A.GND QNB0100-002 1.2k 1/50 E.CLK 0.022 R343 R344 1.2k 1/50 E.DATA 4.7uH R331 C332 0.22 C313 IC161 C314 0.47/50...
  • Page 36 KS-FX921 LCD & Key control section LCD1 IC602 GP1UM261XK CN601 QNZ0006-001 ACC5V R660 REMOCON LCD1 QLD0257-001 EN601 R661 ENC1 QSW0793-001 ENC2 R662 3.3k LCDCE R663 3.3k LCDDA ENC2 R653 R654 LCDCL R664 3.3k ENC1 KEY2 R652 KEY1 KEY0 D660 R651...
  • Page 37 KS-FX921 KS-FX921 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 CN701...
  • Page 38 KS-FX921 Printed circuit boards Main board Forward side C901 IC901 CJ321 B402 CN901 D901 C315 B401 C302 CP401 B204 B102 C907 C905 B101 C902 B201 R901 C917 C314 B203 B151 B154 C912 C916 C352 C906 C904 C914 C332 C903 C162...
  • Page 39 KS-FX921 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 R902 C314 C905 C913 D341 D908 D351 C906 D909...
  • Page 40 KS-FX921 Front board Forward side R650 S614 LCD1 EN601 D601 R639 R612 R613 R640 D641 S608 D623 D642 D643 IC602 S615 S601 S616 S603 S617 S602 R611 R601 R614 D611 D610 D613 D608 D612 D614 D615 D616 D617 D607 D609...
  • Page 41 KS-FX921 VICTOR COMPANY OF JAPAN, LIMITED AV & MULTIMEDIA COMPANY 10-1,1Chome,Ohwatari-machi,Maebashi-city,371-8543,Japan Printed in Japan (No.49846SCH) 2003/05...

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