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JVC KS-FX621 Service Manual
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JVC KS-FX621 Service Manual

JVC KS-FX621 Service Manual

Cassette receiver
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SERVICE MANUAL
03
2003
49825
1
Safety precaution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
2
Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
3
Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
4
Description of major ICs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21
CASSETTE RECEIVER
KS-FX621
TABLE OF CONTENTS
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD.
7
8
O
M
9
10
11
PT
R
12
ND
R
MODE
SCM
Area Suffix
U ------ Other Areas
KS-FX621
No.49825
2003/03

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Summary of Contents for JVC KS-FX621

  • Page 1 KS-FX621 SERVICE MANUAL CASSETTE RECEIVER 49825 2003 KS-FX621 MODE Area Suffix U ------ Other Areas TABLE OF CONTENTS Safety precaution ..............1-2 Disassembly method .
  • Page 2 KS-FX621 SECTION 1 Safety precaution CAUTION 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. 1-2 (No.49825)
  • Page 3 KS-FX621 SECTION 2 Disassembly method 2.1 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) •...
  • Page 4 KS-FX621 2.1.4 Removing the heat sink (See Fig.4) • Prior to performing the following procedure, remove the front panel assembly. (1) Remove the two screws B and two screws C attaching the heat sink on the left side of the body, and remove the heat sink.
  • Page 5 KS-FX621 2.1.7 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 6 KS-FX621 2.2 CD 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)
  • Page 7 KS-FX621 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 of the cassette holder and move in the direction of the ar- Cassette hanger assembly row to release the joint c.
  • Page 8 KS-FX621 2.2.4 Removing the side bracket assembly (See Fig.8 to 10) (1) Remove the screw A attaching the side bracket assembly. (2) Detach the front side of the side bracket assembly upward Side bracket assembly and pull out forward to release the joint i and j in the rear.
  • Page 9 KS-FX621 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. Pinch arm (F) assembly Polywasher (2) Remove the compulsion spring. Compulsion spring Polywasher Pinch arm...
  • Page 10 KS-FX621 2.2.8 Removing the head / tape guide (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. Pinch arm spring (2) Remove the two screws B, the head and the head support spring.
  • Page 11 KS-FX621 2.2.10 Disassembling the flywheel assembly (F) (See Fig.20 and 21) (1) Push and turn counterclockwise the spring holder (F) to re- Polywasher lease the three joints p on the bottom of the flywheel. (2) The spring holder (F), the TU spring and the friction gear Spring holder (F) play come off.
  • Page 12 KS-FX621 2.2.13 Removing the gear base arm / gear base link assembly (See Fig.25 to 27) (1) Move the gear base arm in the direction of the arrow. Gear base arm Joint t (2) Insert a slotted screwdriver to the gear base spring under...
  • Page 13 KS-FX621 2.2.15 Removing the mode gear Mode switch actuator Mode gear (See Fig.28 and 31) (1) Remove the polywasher on the bottom and pull out the mode gear. 2.2.16 Removing the mode switch actuator (See Fig.28, 29 and 31) (1) Pull out the mode switch actuator at the bottom.
  • Page 14 KS-FX621 2.2.19 Removing the gear base assembly / take up gear / reflector gear (See Fig.32 to 34) (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 15 KS-FX621 2.2.21 Removing the side bracket assembly (See Fig.35 to 39) (1) Remove the eject cam plate spring. (2) Push the joint f' through the slot to remove the load rack Boss g' downward. Eject cam limiter Side bracket (3) Move the eject cam limiter in the direction of the arrow to...
  • Page 16 KS-FX621 2.2.22 Removing the main motor assembly / sub motor assembly (See Fig.40 to 42) (1) Remove the belt at the bottom. (2) Remove the polywasher and pull out the mode gear. Main motor assembly (3) Pull out the reduction gear (B).
  • Page 17 KS-FX621 SECTION 3 Adjustment 3.1 Adjustment method Test instruments reqired for adjustment Standard volume position 1. Digital oscilloscoe(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.Test tapes...
  • Page 18 KS-FX621 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 19 KS-FX621 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.49825)1-19...
  • Page 20 KS-FX621 Item Conditions Adjustment and Confirmation methods S.Values Adjust Head Head height adjustment Test tape: azimuth Adjust the azimuth directly. When you SCC-1659 adjustment adjust the height using a mirror tape, VT703(10kHz) remove the cassette housing from the mechanism chassis. After installing the...

  • Page 21: Description Of Major Ics

    KS-FX621 SECTION 4 Description of major ICs 4.1 CXA2559Q (IC401) : Head amp. • Pin layout • Block diagram 24dB 100k 7k/12k 300k MS MODE BIAS MUTE TAPE EQ FWD/RVS MS ON/ 300k 7k/12k 100k 24dB (No.49825)1-21...
  • Page 22 KS-FX621 4.2 HD74HC126P (IC801) : Changer control • Pin arrangement • Pin function Input Output ( TOP VIEW ) • Block diagram 1-22 (No.49825)
  • Page 23 KS-FX621 4.3 KIA7810PI (IC902) : Regulator • Pin layout 1 2 3 • Block diagram 1 INPUT 3 OUTPUT 2 GND (No.49825)1-23...
  • Page 24 KS-FX621 4.4 LC72366-9B41 (IC701) : Micon • Pin layout • Pin function Pin No. Symbol Function 4.5MHz crystal oscillation TEST2 Connect to ground J-BUS SI J-BUS signal data input (to 74HC126) J-BUS SO J-BUS signal data output (to 74HC126) J-BUS SCK...
  • Page 25 KS-FX621 Pin No. Symbol Function TAPE IN Detect cassette in SW. [H] at cassette in STAND BY Detect stand by SW position. REEL Pulse input MODE Detect mode position. Output F/R ( Forward:L Reverse:H) MS IN Detect MS. [H] at no music.
  • Page 26 KS-FX621 4.5 LA4743K (IC301) : Power amp. • 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 PWR GND2...
  • Page 27 KS-FX621 4.6 PT6523LQ (IC651) : LCD driver • Pin layout • Block diagram COMMON SEGMENT DRIVER & LATCH DRIVER CLOCK GENERATOR SHIFT REGISTER ADDRESS DETECTOR • Piin function Pin No. Pin Name Description 1~ 52 SG1 ~ SG52 Segment Output Pins...
  • Page 28 KS-FX621 4.7 RPM6938-SV4 (IC652) : Remote sensor • Pin diagram • Block diagram Comp Rout Detector conversion trimming circuit magnetic shield 4.8 LB1641 (IC402) : DC motor driver • Pin layout • Truth table Input Output Mode OUT1 OUT1 OUT2...
  • Page 29 KS-FX621 4.9 TEA6320T-X (IC161) : E.volume • Pin layout OUTRR OUTLR OUTRF OUTLF MUTE Vref 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...
  • Page 30 KS-FX621 4.10 AN80T05 (IC901) : Regulator • Terminal 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. Symbol Function 10V power supply for illumination.
  • Page 31 KS-FX621 (No.49825)1-31...
  • Page 32 KS-FX621 VICTOR COMPANY OF JAPAN, LIMITED AV & MULTIMEDIA COMPANY MOBILE ENTERTAINMENT CATEGORY 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan (No.49825) Printed in Japan 200303WPC...

  • Page 33: Parts List

    KS-FX621 PARTS LIST [ KS-FX621 ] * All printed circuit boards and its assemblies are not available as service parts. Area suffix U --------------------- Other Areas - 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 34 KS-FX621 Exploded view of general assmbly and parts list Block No.
  • Page 35 KS-FX621 Exploded view of general assembly and parts list Block No. [M][1][M][M]  Symbol No. Part No. Part Name Description Local ------------ MECHA FSYH4036-050 SPACER GE20136-001A MECHA BKT(L) FSKL2002-002 MECHA BKT(R) QYSDST2606Z SCREW 2.6mm x 6mm(x4) QYSDST2606Z SCREW 2.6mm x 6mm...
  • Page 36 KS-FX621 Cassette mechanism assembly and parts list Block No. CDS-802JE3...
  • Page 37 KS-FX621 Cassette mechanism Block No. [M][P][M][M]  Symbol No. Part No. Part Name Description Local  Symbol No. Part No. Part Name Description Local 2-1821-0040-D2S PSW-S 2.1 (x3) 2-1711-5040-16S E RING X-0802-1009S MAIN CHASSIS AS 2-1031-7030-C2S SCREW (x2) X-0802-1002S SLIDE CHASSIS A...
  • Page 38 KS-FX621 Grease point 1/2 FG-84M MEA-512R MEN-223 SW-902 CFD-409 CFD-250H EP-56 SW-474B...
  • Page 39 KS-FX621 Grease point 2/2...

  • Page 40: Electrical Parts List

    KS-FX621 Electrical parts list Main board  Symbol No. Part No. Part Name Description Local Block No. [0][1][0][0] C162 QERF1HM-105Z E CAPACITOR 1uF 50V M  Symbol No. Part No. Part Name Description Local C163 QERF1HM-105Z E CAPACITOR 1uF 50V M...

  • Page 41: Front Board

    KS-FX621  Symbol No.  Symbol No. Part No. Part Name Description Local Part No. Part Name Description Local QRE141J-102Y C RESISTOR 1kΩ 1/4W J R803 QRE141J-101Y C RESISTOR 100Ω 1/4W J QRE141J-103Y C RESISTOR 10kΩ 1/4W J R804 QRE141J-334Y C RESISTOR 330kΩ...
  • Page 42 KS-FX621 Mecha control board  Symbol No. Part No. Part Name Description Local Block No. [0][3][0][0] C651 NCB21HK-223X C CAPACITOR 0.022uF 50V K  Symbol No. C652 NBE20JM-106X TS E CAPACITOR 10uF 6.3V M Part No. Part Name Description Local...
  • Page 43 KS-FX621 <MEMO> 3-11...
  • Page 44 KS-FX621 Packing materials and accessories parts list Block No. Block No. A1,A2 KIT : A3~A7 3-12...
  • Page 45 KS-FX621 Packing Accessories Block No. [M][3][M][M] Block No. [M][5][M][M]  Symbol No.  Symbol No. Part No. Part Name Description Local Part No. Part Name Description Local FSPG4002-001 POLY BAG GET0113-001A INST BOOK ENG ARA CHA INA QPA00801205 POLY BAG...

  • Page 46: Schematic Diagrams

    KS-FX621 SCHEMATIC DIAGRAMS CASSETTE RECEIVER KS-FX621 CD-ROM No.SML200303 8 MO 11 RPT 12 RND MODE Area Suffix U --------------- Other Areas Contents Block diagram Standard schematic diagrams Printed circuit boards 2-5,6 No.49825SCH COPYRIGHT 2003 VICTOR COMPANY OF JAPAN, LTD. 2003/03...

  • Page 47: Safety Precaution

    KS-FX621 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 48: Block Diagram

    KS-FX621 Block diagram LINE OUT CJ321 REAR LEFT L-CH,R-CH REAR RIGHT FM/AM TUNER IC161 IC301 E.VOLUME POWER AMP TAPE.L OUTLF MONO TAPE.R OUTRF PHOTO PHOTO SD/ST SUBMO+ IC402 OUTLR REEL REEL S.METER SUBMO - OUTRR MOTOR IFREQ DRIVER FM/AMOSC MAIN...

  • Page 49: Standard Schematic Diagrams

    KS-FX621 KS-FX621 Standard schematic diagrams Main amp section CJ321 QNN0519-001 QAU0281-001 IC301 LA4743K R353 R354 R343 R344 3.3k 1/50 EVOLCLK 3.3k 1/50 QNB0100-002 EVOLDA 4.7u R321 C322 0.22/50 R341 C342 0.22/50 R331 C332 0.22/50 CH.L R351 C352 0.22/50 R163 3.9k TAPE.L...
  • Page 50 KS-FX621 LCD & Key control section QLD0251-001 Main amp section CJ701 VMC0335-001 CP701 R659 2.2k UDZS5.6B-X D651 D655 MA152WK-X R660 2.2k D654 C651 0.022 IC651 MA152WK- X R661 PT6523LQ C652 10/6.3 MA152WA- X R652 D653 C653 680p D652 MA152WA- X...
  • Page 51 KS-FX621 KS-FX621 Head amp section Q403 2SB1322/RS/-T R401 Q402 UN2211-X CN403 QGF1219F1-10S 0.015 C411 R418 22/16 C409 IC401 CXA2559Q R416 1.5M IC402 LB1641 C422 CN402 QGA2001C1-06 0.015 C410 C425 0.01 C424 CN401 QGB1214K1-18S To Main amp section CP701 TAPE SIGNAL...
  • Page 52 KS-FX621 Printed circuit boards Main board CP801 IC901 C901 R344 L901 R910 CP981 R901 R343 Q351 C308 C309 Q321 C305 D901 R325 C304 CP701 R355 D903 Q905 R321 C905 IC301 C909 C198 R162 R161 C168 C332 C165 C167 C162 C163...
  • Page 53 KS-FX621 Front board Forward side D601 R612 R601 S621 D606 S601 D616 C653 D619 R603 R652 R611 S620 S604 S603 S608 D605 D617 R602 S618 S602 R605 R604 D604 S605 D618 D620 S619 LCD1 D607 D613 D614 S610 D615 S611...
  • Page 54 KS-FX621 Mecha board C419 C418 R412 C413 C416 C414 R416 C421 C422 R414 C412 VR401 Q401 R415 C410 R418 VR402 R413 B402 IC401 C411 R423 R422 B409 B404 CJ403 IC402 R425 CJ401 B413...
  • Page 55 KS-FX621 VICTOR COMPANY OF JAPAN, LIMITED AV & MULTIMEDIA COMPANY 10-1,1Chome,Ohwatari-machi,Maebashi-city,371-8543,Japan Printed in Japan (No.49825SCH) 2003/03...