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JVC KS-FX893 Service Manual

Cassette receiver
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SERVICE MANUAL
CASSETTE RECEIVER
Contents
Safety precaution
Disassembly method
KS-FX893
1-2
1-3
COPYRIGHT
2002 VICTOR COMPANY OF JAPAN, LTD.
UF
Adjustment method
Description of major ICs
KS-FX893
KS-FX893
Area Suffix
China
1-11
1-15~24
No.49763
1-1
Nov. 2002

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Summary of Contents for JVC KS-FX893

  • Page 1 KS-FX893 KS-FX893 SERVICE MANUAL CASSETTE RECEIVER KS-FX893 Area Suffix China Contents Safety precaution Adjustment method 1-11 Disassembly method Description of major ICs 1-15~24 No.49763 COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD. Nov. 2002...
  • Page 2 KS-FX893 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. Please use enough caution not to see the beam directly or touch it in case of an...

  • Page 3: Disassembly Method

    KS-FX893 Disassembly method Removing the front chassis (See Fig.1~2) Remove the two screws A attaching the front chassis. Insert a screwdriver to the two joints a on the side of the front chassis, two joints b on the right side and one joint c from upside, then detach the front chassis toward the front side.
  • Page 4 KS-FX893 Removing the bottom cover (See Fig.4) Turn the body upside down. Bottom cover Insert a screwdriver to the two joints d and two joints e on both sides of the body and the joint f on the back of the body, then detach the bottom cover from the body.
  • Page 5 KS-FX893 Removing the Cassette mechanism Cassette mechanism assembly assembly (See Fig.7) Remove the front chassis. Remove the bottom cover. Remove the main amplifier board assembly. Remove the fore screws F attaching the cassette mechanism assembly from the top cover. Top cover Fig.
  • Page 6 KS-FX893 Cassette mechanism ass’y <Removal of the cassette mechanism> Removing the head amplifier board. Head relay (See Fig.1 and 2) board For the 6pin wire extending from connector CN402 on the head amplifier board, disconnect it from the head relay board.
  • Page 7 KS-FX893 Head relay board Removing the head relay board (See Fig.4) Unsolder the soldering b on the head relay board. Remove the screw C attaching the head relay board. Remove the head relay board in the direction of the Joint c Soldering b arrow while releasing the two joints c.
  • Page 8 KS-FX893 Cassette holder and holder arm Joint h Shaft Joint h Shaft Removing the play head (See Fig.9) Prior to performing the following procedure, remove the head relay board and the sub chassis. Fig.8 Remove the two screws F attaching the play head Pinch roller ass’y...
  • Page 9 KS-FX893 Removing the flywheel Cassette mechanism ass’y Reel disc board (See Fig.10 and 12) Soldering j Prior to performing the following procedure, remove the head relay board, the load arm, the sub chassis, the cassette holder, the holder arm and the reel disc Tab k board.
  • Page 10 KS-FX893 Push aside the gear and reattach the reel disc Ass’y( ). Removing the reel disc ass’y( ) (See Fig.12 to 15) ATTENTION: Prior to performing the following procedure, remove the reel disc ( ). Release the plate from the three tabs o.

  • Page 11: Adjustment Method

    KS-FX893 Adjustment method Test instruments required for adjustment Standard volume position 1. Digital oscilloscope(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 12 KS-FX893 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 Azimuth screw B Azimuth screw A (Reverse) (Forward) Playback Head 1-12...
  • Page 13 KS-FX893 Information f or 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 14 KS-FX893 Mechanism adjustment section Item Adjusting & Confirmation Methods Adjust Std. Value 1. Tape running a) At Forward playmode, using mirror tape, make adjustment Azimuth adjustment with Azimuth screw A and Azimuth screw B, without curl of 4 screw A parts of head tape guide.

  • Page 15: Description Of Major Ics

    KS-FX893 Description of major ICs TEA6320T-X (IC161) : E. volume 1. Pin layout 2. Block diagram VOLUME 2 MUTE 0 to 55 dB FUNCTION BALANCE OUTRR OUTLR ZERO CROSS FENDER REAR POWER DETECTOR OUTRF OUTLF SUPPLY VOLUME 1 BASS TREBLE...
  • Page 16 KS-FX893 LC72366-9987 (IC701) : System CPU 1. Pin layout 2. Pin function Pin No. Symbol Function Crystal oscillator input port Connect to GND Data input for J-BUS information J-BUS SI Data output for J-BUS information J-BUS SO Clock output for J-BUS information...
  • Page 17 KS-FX893 LC72366-9987(2/2) Pin No. Port Name Function Main motor output, H:Transport L: Stop MOTOR Sub-motor output(+), Loading direction to transport output SUBMO+ Sub-motor output(-), Eject direction to transport output SUBMO- Non connection BEEP Switch for detecting to input cassette, L: Cassette in...
  • Page 18 KS-FX893 LA4743K (IC301) : Power amp 1.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 ST BY...
  • Page 19 KS-FX893 2.Terminal layout 3.Pin function LA4743B Pin No. Symbol Function Header of IC Power GND Outpur(-) for front Rch OUTRR- STBY Stand by input OUTRR+ Output (+) for front Rch Power input VCC1/2 OUTRF- Output (-) for rear Rch Power GND...
  • Page 20 KS-FX893 CXA2560Q (IC401) : Dolby B type noise reduction system with play back equalizer amp. 1. Pin layout & Block diagram 7k/12k PBFB2 MSMODE 100k OFF/B PBRIN2 DRSW 300k MS MODE BIAS PBGND TAPESW MUTE PBFIN2 MUTESW TAPE EQ NR MODE...
  • Page 21 KS-FX893 HD74HC126P (IC801) : Changer control 1. Pin arrangement 2. Pin function Input Output ( TOP VIEW ) 3. Block diagram 1-21...
  • Page 22 KS-FX893 AN80T05 (IC901) : Regulator 1. 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 2. Pin function Symbol Function 10V power supply for illumination.
  • Page 23 KS-FX893 KIA7810PI (IC902) : Regulator 1. Pin layout 2. Block diagram 1 INPUT 1 2 3 3 OUTPUT 2 GND RPM6938-SV4 (IC602) : Remote control receiver Comp Rout Detector conversion trimming circuit magnetic shield 1-23...
  • Page 24 KS-FX893 LC75873NW (IC601) : LCD driver 1.Block diagram VDD1 COMMOM SEGMENT DRIVER DRIVER VDD2 CLOCK SHIFT REGISTER GENERATOR ADDRESS DETECTOR 2.Pin functions Pin No. Symbol Description 1~66 S3~S68 Segment Output. 67~69 COM1~3 Common Driver Output. Power Supply Connection. VDD1 Used for applying the LCD drive 2/3 bias voltage externally.
  • Page 25 KS-FX893 < M E M O > 1-25...
  • Page 26 KS-FX893 KS-FX893 VICTOR COMPANY OF JAPAN, LIMITED MOBILE ELECTRONICS DIVISION PERSONAL & MOBILE NETWORK BUSINESS UNIT. 10-1,1Chome,Ohwatari-machi,Maebashi-city,371-8543,Japan Printed in Japan (No.49763) 1-26 200211...

  • Page 27: Schematic Diagrams

    KS-FX893 SCHEMATIC DIAGRAMS CASSETTE RECEIVER KS-FX893 CD-ROM No.SML200211 Area Suffix China Contents Block diagram Standard schematic diagrams Printed circuit boards 2-5~7 No.49763SCH COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD. Nov. 2002...
  • Page 28 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. Please use enough caution not to see the beam directly or touch it in case of an adjustment or operation check.

  • Page 29: Block Diagram

    KS-FX893 Block diagram FSMW1093 GEB10002A MOTOR DRIVER MAIN MOTOR SUBMO+ IC402 SUBMO+ SUB MOTOR SUBMO- SUBMO- REEL PULSE TAPE IN STANDBY MODE MODE STANDBY MEMORY TAPEIN ILLUM CONTROL MOTOR TEL-MUTE REEL OUTLF E.VOLUME POWER AMP. OUTLR TAPE_L OUTRF IC161 IC301...

  • Page 30: Standard Schematic Diagrams

    KS-FX893 KS-FX893 Standard schematic diagrams Main amp. section CJ321 QNN0170-001 IC301 LA4743K QAU0205-001 C361 0.22 R353 R354 QNB0100-002 A.GND 2.7K 1/50 R343 R344 EVOLCLK 1/50 4.7uH EVOLDA 2.7K C332 2.2/50 R331 R351 C352 2.2/50 CH.L A.GND R341 C342 2.2/50 TAPE.L...
  • Page 31 KS-FX893 Mecha control section C415 Q403 2SB1322/RS/-T 0.01 R401 Q402 DTC114EKA-X CN403 QGF1219F1-10S 0.015 C411 R418 CN402 22/16 VMP3501-001 C409 IC401 CXA2560Q R416 910K IC402 LB1641 C422 0.015 C410 C425 0.01 C424 QGB1214K1-18S CN401 TAPE PLAY SIGNAL...
  • Page 32 KS-FX893 KS-FX893 LCD & Key switch section QNZ0449-001 IC602 EN601 RPM6938-SV4 QSW0793-001 R657 REMOCON ACC5V R658 ENC1 ENC2 ENC2 LCDCE R661 3.3K ENC1 LCDDA R662 3.3K R652 R653 R654 LCDCL R663 3.3K 1K( 1/8W) KEY2 KEY1 R651 KEY0 D651 UDZS5.1B-X...
  • Page 33 KS-FX893 Printed circuit boards Main board (Forward side) C901 B904 IC901 C315 B905 L901 C362 C361 R343 CP801 CP981 B903 B901 D901 B301 R353 C906 C905 CP701 C914 B902 R335 C316 R325 C909 R345 C317 D906 C903 C163 C904 C162...
  • Page 34 KS-FX893 Main board (Reverse side) IC901 CJ321 R324 L901 C361 C362 CP801 D901 C315 CP981 CP701 C316 C914 Q321 C905 C906 C907 D321 Q351 D341 Q341 C162 C163 C317 C181 R164 C318 R161 R162 R163 D907 C319 R812 R302 C332...
  • Page 35 KS-FX893 Cassette mecha control board (Forward side) C419 C416 C414 B436 C410 B451 C409 Q403 C411 B441 CN401 CN403 C423 R426 IC402 (Reverse side) C419 C418 R412 C413 C416 C414 R416 C421 C422 R414 C412 VR401 Q401 R415 C410 R418...
  • Page 36 KS-FX893 VICTOR COMPANY OF JAPAN, LIMITED MOBILE ERECTRONICS DIVISION PERSONAL & MOBILE NETWORK BUSINESS UNIT. 10-1,1Chome,Ohwatari-machi,Maebashi-city,371-8543,Japan Printed in Japan No.49763SCH 200211...

  • Page 37: Parts List

    KS-FX893 PARTS LIST [ KS-FX893 ] * All printed circuit boards and its assemblies are not available as service parts. Areas suffix UF ----------------------------- China - Contents - Exploded view of general assembly and parts list (Block No.M1) 3- 2 Cassette mechanism assembly and parts list (Block No.MP)
  • Page 38 KS-FX893 Exploded view of general assembly and parts list Block No.
  • Page 39 KS-FX893 Parts list (General assembly) Block No. M1MM Item Description Parts number Parts name Q'ty Area --------------- CASSETTE MECHA 1 CDS-801 FSYH4036-050 SHEET FSKL2001-004 MECHA BRACKET(L) FSKL2002-002 MECHA BRACKET(R) QYSDST2606Z SCREW QYSDST2606Z SCREW FSJC1056-001 TOP CHASSIS FSMH3001-204 HEAT SINK FSKM3011-002SSF...
  • Page 40 KS-FX893 Parts list (General assembly) Block No. M1MM Item Description Parts number Parts name Q'ty Area FSYH4036-032 SHEET 1 SEL BUTTON GE30104-001A RIM LENS 1 FOR KNOB GE30115-002A EJECT BUTTON VKW3001-330 COMP.SPRING 1 FOR EJECT BUTTON GE30116-001A DETACH BUTTON VKW3001-330 COMP.SPRING...
  • Page 41 KS-FX893 Cassette mechanism assembly and parts list Block No. CDS-801 CFD-409 100 101 102 FG-84M FG-84M SW-902 FG-84M SW-902 CFD-409 CFD-409 CFD-409 SW-522B FG-84M FG-84M SW-522B FG-84M FG-84M LEN-315Y2 LEN-315Y2 CFD-409 LEN-315Y2 LEN-315Y2 FG-84M FG-84M FG-84M FG-84M FG-84M FG-84M FG-84M...
  • Page 42 KS-FX893 Parts list (Cassette mechanism) Block No. MPMM Item Parts number Parts name Q'ty Description Area X-0801-1003S MAIN CHASSIS AS X-0801-1002S SLIDE CHASSIS A SIDE BKT ASS'Y X-0801-1008S X-0801-1010S EJECT CAM LIMIT X-0801-1013S CASSETTE HANGER 1-0801-6002S FLYWHEEL ASSY F X-0801-2003S...
  • Page 43 KS-FX893 Parts list (Cassette mechanism) Block No. MPMM Item Parts number Parts name Q'ty Description Area 1-0801-4008S REEL DRIVER SPG 1-0801-4009S LOAD ARM SPG 1-0801-4011S HOLDER STAB SPG 1-0801-5001S BELT 1-0801-5002S FELT 1 7.5*18.5*1.0 1-0801-5003S AZIMUTH SCR 1-0801-5004S FELT 1 11*18.5*1.0...
  • Page 44 KS-FX893 Grease point 1/2 SW-902 SW-522B FG-84M CFD-409 LEN-315Y2 FG-84M SW-902 SW-902 SW-902 FG-84M FG-84M SW-902 FG-84M SW-902 FG-84M FG-84M EP56...
  • Page 45 KS-FX893 Grease point 2/2...
  • Page 46 KS-FX893 Electrical parts list (Main board) Block No. 01 Item Remarks Item Remarks Parts number Parts name Area Parts number Parts name Area QERF1CM-106Z E CAPACITOR 10MF 20% 16V C 361 QCBB1HK-223Y C CAPACITOR .022MF 10% 50V QERF1CM-106Z E CAPACITOR...
  • Page 47 KS-FX893 Electrical parts list (Main board) Block No. 01 Item Remarks Item Remarks Parts number Parts name Area Parts number Parts name Area IC301 LA4743K R 195 QRE141J-100Y C RESISTOR 10 5% 1/4W IC701 LC72366-9987 R 241 QRE141J-154Y C RESISTOR...
  • Page 48 KS-FX893 Electrical parts list (Main board) Block No. 01 Electrical parts list (Mecha control board) Block No. 02 Item Remarks Item Parts number Parts name Remarks Area Parts number Parts name Area C 401 NDC31HJ-101X C CAPACITOR R 750 QRE141J-243Y...
  • Page 49 KS-FX893 Electrical parts list (Front board) Block No. 03 Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area C 601 NBE20JM-475X TS E CAPACITOR R 621 NRS181J-471X MG RESISTOR C 602 NCB31HK-103X C CAPACITOR R 622...
  • Page 50 KS-FX893 Packing materials and accessories parts list Block No. Block No. KIT : A3~A7 3-14...
  • Page 51 KS-FX893 Parts list (Packing) Block No. M3MM Item Description Parts number Parts name Q'ty Area FSPG4002-001 POLY BAG 1 INST.BOOK QPA00801205 POLY BAG 1 SCREW KIT QPC03004315P POLY BAG 1 SET --------------- POLY BAG 1 HARD CASE --------------- SHEET ---------------...