Download
Share
Print this page
JVC ks-fx834r Service Manual
  1. Manuals
  2. Brands
  3. JVC Manuals
  4. Car Receiver
  5. KS-FX834R
  6. Service manual
JVC ks-fx834r Service Manual

JVC ks-fx834r Service Manual

Hide thumbs Also See for ks-fx834r:

Advertisement

Quick Links

Download this manual See also: Service Manual, Instruction Manual
SERVICE MANUAL
Contents
CASSETTE RECEIVER
This service manual is printed on 100% recycled paper.
COPYRIGHT
2000 VICTOR COMPANY OF JAPAN, LTD.
Area Suffix
E ---- Continental Europe
1-2
1-3
1-10
1-14
KS-FX834R
No.49571
Sep. 2000

Advertisement

loading

Related Manuals for JVC ks-fx834r

Summary of Contents for JVC ks-fx834r

  • Page 1: Table Of Contents

    KS-FX834R SERVICE MANUAL CASSETTE RECEIVER KS-FX834R Area Suffix E ---- Continental Europe Contents Safety precaution Disassembly method Adjustment method 1-10 Description of major ICs 1-14 No.49571 This service manual is printed on 100% recycled paper. COPYRIGHT 2000 VICTOR COMPANY OF JAPAN, LTD.

  • Page 2: Safety Precaution

    KS-FX834R 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-FX834R 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-FX834R 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-FX834R 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-FX834R 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-FX834R 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-FX834R 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-FX834R 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-FX834R 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-FX834R 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 1-11...
  • Page 12 KS-FX834R 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-FX834R 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: Description Of Major Ics

    KS-FX834R Description 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-FX834R BA4905-V3 (IC901) : Regulator 1.Terminal layout 2.Block diagram 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-FX834R 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-FX834R UPD178018AGC-551 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 MS input I2CCLK I2C information clock output...
  • Page 18 KS-FX834R 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) 1-18...
  • Page 19 KS-FX834R 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 1-19...
  • Page 20 KS-FX834R RPM6938-SV4 (IC602) : Remote control receiver Comp Rout Detector conversion trimming circuit magnetic shield LB1641 (IC402) : DC Motor Driver 2. Pin Functions 1. Pin Layout Input Output Mode OUT1 OUT2 Brake CLOCKWISE COUNTER-CLOCKWISE GND OUT1 P1 IN2 VCC1 VCC2 P2...
  • Page 21 KS-FX834R 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 22 KS-FX834R 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 analog part VSSA Ground for analog part (0V)
  • Page 23 KS-FX834R 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 24: Ks-Fx834R

    KS-FX834R VICTOR COMPANY OF JAPAN, LIMITED MOBILE ELECTRONICS DIVISION PERSONAL & MOBILE NETWORK B.U. 10-1,1Chome,Ohwatari-machi,Maebashi-city,Japan Printed in Japan (No.49571) 200009(V)