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

JVC KS-FX621 Service Manual

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3 7 63 1515 0
SERVICE MANUAL
03
2003
49825
TE
L 13942296513
1
Safety precaution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
2
Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
3
Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
4
Description of major ICs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21
www
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http://www.xiaoyu163.com
CASSETTE RECEIVER
KS-FX621
TABLE OF CONTENTS
x
ao
u163
y
i
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD.
http://www.xiaoyu163.com
2 9
8
7
8
O
M
9
10
11
PT
R
Q Q
3
6 7
1 3
1 5
U ------ Other Areas
co
.
9 4
2 8
12
ND
R
MODE
SCM
0 5
8
2 9
9 4
2 8
Area Suffix
m
KS-FX621
9 9
9 9
No.49825
2003/03

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Summary of Contents for JVC KS-FX621

  • Page 1 KS-FX621 3 7 63 1515 0 SERVICE MANUAL CASSETTE RECEIVER 49825 2003 KS-FX621 MODE L 13942296513 Area Suffix U ------ Other Areas TABLE OF CONTENTS Safety precaution ..............1-2 Disassembly method .

  • Page 2: Safety Precaution

    KS-FX621 3 7 63 1515 0 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.

  • Page 3: Disassembly Method

    KS-FX621 3 7 63 1515 0 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- sembly. Front panel assembly Release button Fig.1 2.1.2 Removing the bottom cover...
  • Page 4 KS-FX621 3 7 63 1515 0 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 3 7 63 1515 0 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.
  • Page 6 KS-FX621 3 7 63 1515 0 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).
  • Page 7 KS-FX621 3 7 63 1515 0 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 3 7 63 1515 0 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 3 7 63 1515 0 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.
  • Page 10 KS-FX621 3 7 63 1515 0 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 3 7 63 1515 0 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.
  • Page 12 KS-FX621 3 7 63 1515 0 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 3 7 63 1515 0 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)
  • Page 14 KS-FX621 3 7 63 1515 0 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 3 7 63 1515 0 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.
  • Page 16 KS-FX621 3 7 63 1515 0 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: Adjustment

    KS-FX621 3 7 63 1515 0 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 &...
  • Page 18 KS-FX621 3 7 63 1515 0 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 3 7 63 1515 0 Arrangement of adjusting & test points Cassette mechanism (Surface) Motor assembly Tape speed adjust Azimuth screw A (Forward) Playback head Azimuth screw B (Reverse) L 13942296513 Head section view Playback head Azimuth screw B...
  • Page 20 KS-FX621 3 7 63 1515 0 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.

  • Page 21: Description Of Major Ics

    KS-FX621 3 7 63 1515 0 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 L 13942296513 TAPE EQ FWD/RVS MS ON/...
  • Page 22 KS-FX621 3 7 63 1515 0 4.2 HD74HC126P (IC801) : Changer control • Pin arrangement • Pin function Input Output ( TOP VIEW ) • Block diagram L 13942296513 u163 1-22 (No.49825) http://www.xiaoyu163.com...
  • Page 23 KS-FX621 3 7 63 1515 0 4.3 KIA7810PI (IC902) : Regulator • Pin layout 1 2 3 • Block diagram 1 INPUT 3 OUTPUT L 13942296513 2 GND u163 (No.49825)1-23 http://www.xiaoyu163.com...
  • Page 24 KS-FX621 3 7 63 1515 0 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)
  • Page 25 KS-FX621 3 7 63 1515 0 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.
  • Page 26 KS-FX621 3 7 63 1515 0 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...
  • Page 27 KS-FX621 3 7 63 1515 0 4.6 PT6523LQ (IC651) : LCD driver • Pin layout • Block diagram COMMON SEGMENT DRIVER & LATCH DRIVER CLOCK GENERATOR SHIFT REGISTER ADDRESS DETECTOR L 13942296513 • Piin function Pin No. Pin Name...
  • Page 28 KS-FX621 3 7 63 1515 0 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...
  • Page 29 KS-FX621 3 7 63 1515 0 4.9 TEA6320T-X (IC161) : E.volume • Pin layout OUTRR OUTLR OUTRF OUTLF Vref MUTE CD-CH TAPE TUNER • Block diagram VOLUME 2 MUTE 0 to 55 dB FUNCTION BALANCE ZERO CROSS FENDER REAR...
  • Page 30 KS-FX621 3 7 63 1515 0 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 L 13942296513 Pin No.
  • Page 31 KS-FX621 3 7 63 1515 0 L 13942296513 u163 (No.49825)1-31 http://www.xiaoyu163.com...
  • Page 32 KS-FX621 3 7 63 1515 0 L 13942296513 u163 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 http://www.xiaoyu163.com...

  • Page 33: Schematic Diagrams

    KS-FX621 3 7 63 1515 0 SCHEMATIC DIAGRAMS CASSETTE RECEIVER KS-FX621 CD-ROM No.SML200303 L 13942296513 8 MO 11 RPT 12 RND MODE Area Suffix U --------------- Other Areas Contents Block diagram Standard schematic diagrams Printed circuit boards 2-5,6 u163 No.49825SCH...
  • Page 34 KS-FX621 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 35 KS-FX621 3 7 6 3 1 5 1 5 0 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...
  • Page 36 KS-FX621 KS-FX621 3 7 6 3 1 5 1 5 0 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...
  • Page 37 KS-FX621 3 7 6 3 1 5 1 5 0 LCD & Key control section QLD0251-001 Main amp section CJ701 VMC0335-001 CP701 1 3 9 4 2 2 9 6 5 1 3 R659 2.2k UDZS5.6B-X D651 D655 MA152WK-X R660 2.2k...
  • Page 38 KS-FX621 KS-FX621 3 7 6 3 1 5 1 5 0 Head amp section Q403 2SB1322/RS/-T R401 Q402 UN2211-X CN403 QGF1219F1-10S 0.015 C411 R418 22/16 1 3 9 4 2 2 9 6 5 1 3 C409 IC401 CXA2559Q R416 1.5M...
  • Page 39 KS-FX621 3 7 63 1515 0 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...
  • Page 40 KS-FX621 3 7 63 1515 0 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...
  • Page 41 KS-FX621 3 7 63 1515 0 Mecha board C419 C418 R412 C413 C416 C414 C421 R416 C422 R414 C412 VR401 Q401 R415 C410 R418 VR402 R413 B402 IC401 C411 R423 R422 B409 B404 CJ403 IC402 R425 CJ401 B413 L 13942296513 u163 http://www.xiaoyu163.com...
  • Page 42 KS-FX621 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.49825SCH) 2003/03 http://www.xiaoyu163.com...

  • Page 43: Parts List

    KS-FX621 3 7 63 1515 0 PARTS LIST [ KS-FX621 ] * All printed circuit boards and its assemblies are not available as service parts. Area suffix U --------------------- Other Areas L 13942296513 - Contents - Exploded view of general assembly and parts list (Block No.M1) Cassette mechanism assembly and parts list (Block No.MP)
  • Page 44 KS-FX621 3 7 63 1515 0 Exploded view of general assmbly and parts list Block No. L 13942296513 u163 http://www.xiaoyu163.com...
  • Page 45 KS-FX621 3 7 63 1515 0 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)
  • Page 46 KS-FX621 3 7 63 1515 0 Cassette mechanism assembly and parts list Block No. CDS-802JE3 L 13942296513 u163 http://www.xiaoyu163.com...
  • Page 47 KS-FX621 3 7 63 1515 0 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...
  • Page 48 KS-FX621 3 7 63 1515 0 Grease point 1/2 FG-84M MEA-512R MEN-223 SW-902 CFD-409 CFD-250H EP-56 SW-474B L 13942296513 u163 http://www.xiaoyu163.com...
  • Page 49 KS-FX621 3 7 63 1515 0 Grease point 2/2 L 13942296513 u163 http://www.xiaoyu163.com...
  • Page 50 KS-FX621 3 7 63 1515 0 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...
  • Page 51 KS-FX621 3 7 63 1515 0  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...
  • Page 52 KS-FX621 3 7 63 1515 0  Symbol No. Mecha control board 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.
  • Page 53 KS-FX621 3 7 63 1515 0 <MEMO> L 13942296513 u163 3-11 http://www.xiaoyu163.com...
  • Page 54 KS-FX621 3 7 63 1515 0 Packing materials and accessories parts list Block No. Block No. A1,A2 L 13942296513 KIT : A3~A7 u163 3-12 http://www.xiaoyu163.com...
  • Page 55 KS-FX621 3 7 63 1515 0 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...