JVC KS-FX850R Service Manual
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JVC KS-FX850R Service Manual

JVC KS-FX850R Service Manual

Cassette receiver
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KS-FX850R/KS-FX820R/KS-FX835R
VICTOR COMPANY OF JAPAN, LIMITED
MOBILE ELECTRONICS DIVISION,10-1,1Chome,Ohwatari-machi,Maebashi-city,Japan
(No.49549)
SERVICE MANUAL
Contents
Instructions
Description of major ICs
Printed in Japan
200002(V)
KS-FX850R/KS-FX820R/KS-FX835R
CASSETTE RECEIVER
KS-FX850R
KS-FX820R
KS-FX835R
KS-FX850R
40Wx4
DISP
MO
5
RND
RDS
SSM
°
TP
RPT
PTY
DOLBY B NR
DAB
7
8
9
10
11
12
TAPE
SCM
CD
-CH
FM/AM
KS-FX835R
40Wx4
MO
DISP
5
RND
RDS
SSM
°
TP
RPT
PTY
DOLBY B NR
DAB
7
8
9
10
11
12
TAPE
SCM
CD
-CH
FM/AM
KS-FX820R
40Wx4
DISP
MO
RND
5
RDS
°
SSM
TP
RPT
PTY
DAB
7
8
9
10
11
12
DOLBY B NR
CD
FM/AM
TAPE
SCM
-CH
Illumination
Remote controller
Color
Blue & Red
White
1-2
1-3~18
2-1
2-8
2-12
This service manual is made from 100% recycled paper.
COPYRIGHT
2000 VICTOR COMPANY OF JAPAN, LTD.
Area Suffix
E ---- Continental Europe
2-21
2-22
2-25
3-1~17
No.49549
Feb. 2000

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  • Page 1: Table Of Contents

    KS-FX850R/KS-FX820R/KS-FX835R KS-FX850R/KS-FX820R/KS-FX835R SERVICE MANUAL CASSETTE RECEIVER KS-FX850R KS-FX820R KS-FX835R Area Suffix E ---- Continental Europe KS-FX850R 40Wx4 DISP ° DOLBY B NR TAPE FM/AM KS-FX835R 40Wx4 DISP ° DOLBY B NR TAPE FM/AM KS-FX820R 40Wx4 DISP ° DOLBY B NR...

  • Page 2: Safety Precaution

    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-FX850R/KS-FX835R/KS-FX820R Disassembly method Removing the front panel unit (See Fig.1) 1. Press the release switch and remove the front panel unit in the direction of the arrow. Fig.1 Removing the front chassis (See Fig.2~3) Remove the two screws A attaching the front chassis.
  • Page 4 KS-FX850R/KS-FX835R/KS-FX820R Removing the bottom cover Bottom cover (See Fig.5) Turn the body upside down. 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-FX850R/KS-FX835R/KS-FX820R Removing the Cassette mechanism Cassette mechanism assembly assembly (See Fig.8) 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. Fig. 8...
  • Page 6 KS-FX850R/KS-FX835R/KS-FX820R Cassette mechanism ass’y <Removal of the cassette mechanism> Removing the mecha control P.W.B. Head relay (See Fig.1 and 2) P.W.B. For the 6pin harness extending from connector CN402 on the mecha control P.W.B, disconnect it from the head relay P.W.B.
  • Page 7 KS-FX850R/KS-FX835R/KS-FX820R Head relay P.W.B. Removing the head relay P.W.B. (See Fig.4) Unsolder the soldering b on the head relay P.W.B. Remove the screw C attaching the head relay P.W.B. Remove the head relay P.W.B. in the direction of the Joint c Soldering b arrow while releasing the two joints c.
  • Page 8 KS-FX850R/KS-FX835R/KS-FX820R 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 P.W.B.and the sub chassis. Fig.8 Remove the two screws F attaching the play head Pinch roller ass’y...
  • Page 9 KS-FX850R/KS-FX835R/KS-FX820R Removing the flywheel Cassette mechanism ass’y Reel disc P.W.B. (See Fig.10 and 12) Soldering j Prior to performing the following procedure, remove the head relay P.W.B, the load arm, the sub chassis, the cassette holder, the holder arm and the reel disc Tab k P.W.B.

  • Page 10: Adjustment Method

    KS-FX850R/KS-FX835R/KS-FX820R 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 5. Test Tapes following conditions. Playback the test tape VT721.
  • Page 11 KS-FX850R/KS-FX835R/KS-FX820R 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...
  • Page 12 KS-FX850R/KS-FX835R/KS-FX820R 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 13 KS-FX850R/KS-FX835R/KS-FX820R 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 14 KS-FX850R/KS-FX835R/KS-FX820R Descrption of major ICs 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...
  • Page 15 KS-FX850R/KS-FX835R/KS-FX820R BA4905-V3 (IC901) : Regulator 1.Terminal layout 2.Block daigram REGULATOR RESET RESET COMP VDD 5.7V CD 8V AUDIO 9V CTRL ILM 10V 3.Pin function Pin no. Symbol Function RESET If VDD voltage becomes 4V or less.RESET output becomes low level.
  • Page 16 KS-FX850R/KS-FX835R/KS-FX820R UPD178018AGC-551 (IC701) : Main system control CPU 1. Pin layout 2. Pin function Pin No. Port Name Descriptions KEY 0 Key input 0 KEY 1 Key input 1 KEY 2 Key input 2 LEVEL Level meter input S.meter level input S.Quality level input...
  • Page 17 KS-FX850R/KS-FX835R/KS-FX820R UPD178018AGC-551 (IC701) : Main system control CPU Pin No. Port Name Descriptions FF/REW Output for input signal level switching for MS L : FF,REW H : PLAY FWD,REV running direction switch signal input DOLBY Dolby on "H" output MSIN...
  • Page 18 KS-FX850R/KS-FX835R/KS-FX820R HA13158A (IC301) : Power amp 1. Pin layout 2. Block diagram PVCC2 PVCC1 INVCC STBY INPUTBUFFER1 AMP1 INPUTBUFFER2 AMP2 INPUTBUFFER3 AMP3 INPUTBUFFER4 AMP4 MUTE PROTECTOR (ASO SURGE, TSD) 2-16...
  • Page 19 KS-FX850R/KS-FX835R/KS-FX820R HD74HC126FP-X (IC801) : Buffer 1. Pin layout 2. Function Inputs Outputs 3. Block diagram Output Input Output Sample as Load Circuit 1 Output Sample as Load Circuit 1 Output Sample as Load Circuit 1 RPM6938-SV4 (IC602) : Remote control receiver...
  • Page 20 KS-FX850R/KS-FX835R/KS-FX820R 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 21 KS-FX850R/KS-FX835R/KS-FX820R SAA6579T-X (IC71) : RDS demodulator 1. Pin layout 2. Pin function Symbol Function QUAL Quality indication output RDDA RDS data output Vref Reference voltage output (0.5VDDA) Multiplex signal input VDDA +5V supply voltage for anarog part VSSA Ground for analog part (0V)
  • Page 22 KS-FX850R/KS-FX835R/KS-FX820R 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 +20 to -31 dB VOLUME 2 LEFT...

  • Page 23: Block Diagram

    KS-FX850R/KS-FX835R/KS-FX820R Block diagram 2-21...

  • Page 24: Standard Schematic Diagrams

    Standard schematic diagrams Tuner & Main circuit section TUNER SIGNAL CD CHANGER SIGNAL TAPE SIGNAL FRONT SIGNAL REAR SIGNAL...
  • Page 25 Mechanism control circuit section TAPE SIGNAL...
  • Page 26 LCD & Key control circuit section...

  • Page 27: Printed Circuit Board

    Printed circuit boards LCD & Key control board (Forward side) Main board LCD & Key control board (Reverse side) Reel board Mecah control board CA-IN Main:- Main:+ MODE Sub:- Sub:+ S T- B Y CrO2...
  • Page 28 PARTS LIST [ KS-FX850R ] [ KS-FX835R ] [ KS-FX820R ] * All printed circuit boards and its assemblies are not available as service parts. Areas suffix E ----------- Continental Europe - Contents - Exploded view of general assembly and parts list...

  • Page 29: Parts List

    Parts list (General assembly) Block No. M1MM Parts number Parts name Q'ty Description Item Area ZCKSFX850R-FB FRONT CHASSIS 1 KS-FX850R ZCKSFX820R-FB FRONT CHASSIS 1 KS-FX820R/835R FSJC1060-001 FRONT CHASSIS FSJC3014-001 CASSETTE LID 1 KS-FX850R FSJC4003-031 CASSETTE LID 1 KS-FX820R/835R VKW4947-002 DOOR SPRING...
  • Page 30 FSYH4036-035 SHEET 1 SLIDING SHEET FSYH4036-049 KNOB SHEET FSYH4036-050 MECHA SHEET FSYH4036-032 SHEET FSKL2001-001 MECHA BRACKET LCD1 QLD0113-001 LCD MODULE 1 KS-FX850R QLD0124-001 LCD MODULE 1 KS-FX820R QLD0123-001 LCD MODULE 1 KS-FX835R FSKL2002-001 MECHA BRACKET FSYH4036-031 SHEET FSXP3059-001 DETACH BUTTON...
  • Page 31 Cassette mechanism assembly and parts list Block No. CDS-801 CFD-409 99 100 101 102 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 SW-522B FG-84M...
  • Page 32 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...
  • Page 33 Grease point 2/2...
  • Page 34 Parts list (Cassette mechanism) Block No. M2MM Parts number Parts name Q'ty Description Item Area X-0801-1003S MAIN CHASSIS AS X-0801-1002S SLIDE CHASSIS A X-0801-1008S SIDE BKT ASS'Y X-0801-1010S EJECT CAM LIMIT X-0801-1013S CASSETTE HANGER 1-0801-6002S FLYWHEEL ASSY F X-0801-2003S GEAR BASE ASS'Y X-0801-2021S PINCH ARM F ASS X-0801-2022S...
  • Page 35 Parts list (Cassette mechanism) Block No. M2MM Parts number Parts name Q'ty Description Item 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 1-0801-5005S REEL WASHER 21732-6280-36S...
  • Page 36 Packing materials and accessories parts list Block No. Block No. A1,A2,A3,A18 KIT2:A10,A11,A17 KIT1:A5 A9 A20,A21 KS-FX850R/835R : Remocon : Trim Plate A21 : Battery SCREW KIT 1 : Plug nut SCREW KIT 2 : Hook : Mount bolt : Car Cable...

  • Page 37: Packing Parts List

    Packing parts list Block No. M3MM Description Item Parts number Parts name Q'ty Area FSPE3001-174 PACKING CASE 1 KS-FX850R FSPE3004-061 PACKING CASE 1 KS-FX820R FSPE3004-060 PACKING CASE 1 KS-FX835R FSPH1018-002 PAPER CUSHION VPE3005-064 POLY BAG QPA01703505P POLY BAG 2 FOR INST. BOOK...

This manual is also suitable for:

Ks-fx835rKs-fx820r

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