JVC KS-FX925R Service Manual
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JVC KS-FX925R Service Manual

JVC KS-FX925R Service Manual

Cassette receiver
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Download this manual See also: Instruction Manual
SERVICE MANUAL
CASSETTE RECEIVER
KS-FX925R
ATT
SOUND
U
R
F
SOURCE
D
VOL
VOL
Contents
Safety precaution
Disassembly method
Adjustment method
Description of major ICs
COPYRIGHT
EQ
2002 VICTOR COMPANY OF JAPAN, LTD.
DAB
TAPE
Area Suffix
EE --------- Russian Federation
1- 2
1- 3
1-11
1-15~26
KS-FX925R
No.49742
May. 2002

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  • Page 1 KS-FX925R SERVICE MANUAL CASSETTE RECEIVER KS-FX925R SOUND SOURCE TAPE Area Suffix EE --------- Russian Federation Contents Safety precaution 1- 2 Disassembly method 1- 3 Adjustment method 1-11 Description of major ICs 1-15~26 No.49742 COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.

  • Page 2: Safety Precaution

    KS-FX925R 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 3: Disassembly Method

    KS-FX925R Disassembly method Removing the front panel unit (See Fig.1) Press the release switch and remove the front panel unit in the direction of the arrow. Front panel unit Removing the bottom cover Fig.1 (See Fig.2,3) Joint a Turn the body upside down.
  • Page 4 KS-FX925R Removing the heat sink (See Fig.6) Remove the four screws C attaching the heat sink on the left side of the body, and remove the heat sink. Heat sink Fig. 6 Removing the rear panel (See Fig.7 ) Prior to performing the following procedure, remove Rear panel the front chassis, the heat sink and bottom cover.
  • Page 5 KS-FX925R Removing the cassette mechanism assembly Cassette mechanism assembly (See Fig.9) Prior to performing the following procedure, remove the front chassis, the heat sink, bottom cover and the main amplifier board assembly. Remove the four screws G attaching the cassette mechanism assembly from the top cover.
  • Page 6 KS-FX925R <Cassette mechanism section> REFERENCE: Prior performing 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). Removing the reinforce bracket (See Fig.1 and 2) Mode gear Remove the screw A attaching the reinforce bracket on the bottom of the body.
  • Page 7 KS-FX925R Removing the load arm (See Fig.5) Load arm Remove the E-washer attaching the load arm. Move the load arm in the direction of the arrow and release the joint e on the cassette catch. E-washer Joint e Fig.5 Cassette holder assembly...
  • Page 8 KS-FX925R Removing the side bracket assembly Side bracket assembly (See Fig.10 to 12) Joint l Remove the screw C attaching the side bracket assembly. Joint m Detach the front side of the side bracket assembly upward and pull out forward to release the joint l and m in the rear.
  • Page 9 KS-FX925R Removing the pinch arm (F) assembly (See Fig.13 and 14) Remove the polywasher and pull out the pinch arm (F) assembly. Remove the compulsion spring. Polywasher Pinch arm Polywasher Pinch arm (F) assembly (R) assembly Removing the pinch arm (R) assembly Fig.13...
  • Page 10 KS-FX925R Removing the head / tape guide (See Fig.18 and 19) Slide chassis assembly REFERENCE: It is not necessary to remove the slide chassis assembly. Remove the band attaching the wire to the head. Remove the two screws D, the head and the head...
  • Page 11 KS-FX925R Disassembling the flywheel assembly (F) (See Fig.22 and 23) Push and turn counterclockwise the spring holder (F) Flywheel assembly (F) Flywheel assembly (R) to release the three joints s on the bottom of the flywheel. The spring holder (F), the TU spring and the friction gear play come off.
  • Page 12 KS-FX925R Removing the gear base arm / gear base Gear base arm Joint w link assembly (See Fig.27 to 29) Joints v Move the gear base arm in the direction of the arrow. Hook x Insert a slotted screwdriver to the gear base spring...
  • Page 13 KS-FX925R Mode gear Mode switch actuator Removing the mode gear (See Fig.30 and 33) Remove the polywasher on the bottom and pull out the mode gear. Removing the mode switch actuator Polywasher (See Fig.30, 31 and 33) Pull out the mode switch actuator at the bottom.
  • Page 14 KS-FX925R Slot f' Removing the gear base assembly / take up gear / reflector gear (See Fig.34 to 36) Push in the pin e’ of the gear base assembly on the upper side of the body and move the reflector gear toward the bottom, then pull out.
  • Page 15 KS-FX925R Removing the side bracket assembly (See Fig.37 to 41) Remove the eject cam plate spring. Push the joint g‘ through the slot to remove the load rack downward. Joint g' Move the eject cam limiter in the direction of the arrow to release it from the boss h’...
  • Page 16 KS-FX925R Main motor Removing the main motor assembly / assembly sub motor assembly (See Fig.42 to 44) Reduction gear (B) Belt Reduction Remove the belt at the bottom. gear (A) Remove the polywasher and pull out the mode gear. Polywasher Sub motor Pull out the reduction gear (B).

  • Page 17: Adjustment Method

    KS-FX925R Adjustment method Frequency Range Test Instruments reqired for adjustment 1.Digital osclloscope(100MHz) FM1 /FM2 : 87.5 MHz to 108.0 MHz 2.Frequency Counter meter : 65 MHz to 74 MHz 3.Electric voltmeter 4.Wow & flutter meter : (MW) 522 kHz to 1620 kHz 5.Test Tapes...
  • Page 18 KS-FX925R Arrangment of adjusting Head amplifier board section (Reverse side) VR401:Rch VR402:Rch (Dolby NR Frequency response adj) (Dolby NR level adj) C418 C413 C419 R412 C416 C414 C421 R416 C422 R414 C412 VR401 Q401 R415 C410 R418 VR402 R413 B402...
  • Page 19 KS-FX925R Item Adjustment and check method Adjust Spec 1.Tape position Playback at FWD side, use the mirror tape and Azimuth adjuste azimuth screw A and B, check the tape screw A position at tape guide position of the head. Playback at REV side, use the mirror tape and adjuste azimuth screw A and B, check the tape position at tape guide position of the head.

  • Page 20: Description Of Major Ics

    KS-FX925R Description of major ICs HA13164A (IC901) : Regulator 1.Terminal layout 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 2.Block diagram 100u 0.1u BATT.DET OUT ANT OUT Surge Protector 0.1u EXT OUT COMPOUT BIAS 0.1u...
  • Page 21 KS-FX925R 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 22 KS-FX925R UPD178018AGC624 (IC701) : 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 23 KS-FX925R UPD178018AGC621(2/2) 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 I2CSCK E-VOL IC control data I/O...
  • Page 24 KS-FX925R HD74HC126FP-X (IC801) : Buffer 1.Terminal layout 3.Pin function Input Output Note) H:High level L:Low level X:Irrelevant Z:Off(High-impedance) State a 3-state input 2.Block diagram Output Input Output Sample as Load Circuit 1 Output Sample as Load Circuit 1 Output Sample as Load Circuit 1...
  • Page 25 KS-FX925R LC75873NW (IC601) : LCD driver 1.Pin layout 2.Block diagram VDD1 COMON SEGMENT DRIVER DRIVER VDD2 CLOCK SHIFT REGISTOR GENERATOR ADDRESS DETECTOR 3.Pin function Pin No. Pin name Description Segment outouts for displaying the display data S1/P1 TO S4/P4 79,80 transferred by serial data input.
  • Page 26 KS-FX925R SAA6579T-X (IC71) : RDS 1.Pin layout QUAL RDCL RDDA Vref OSCO OSCI TEST SCOUT MODE 2.Block diagram ANTI- 57 kHz OSCILATOR QUALITY BIT RECONSTRUCTION ALIASING BANDPASS GENERATOR FILTER FILTER (8th ORDER) DIVIDER BIPHASE COSTAS LOOP CLOCKED DIFFERENTIAL VARIABLE AND...
  • Page 27 KS-FX925R TEA6320T-X (IC161) : E.VOLUME 1.Terminal 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 28 KS-FX925R LA47505 (IC301) : Power amp. 1.Terminal layout Protective circuit Stand by Switch Ripple Mute Filter circuit protective circuit Muting & On Time Control Circuit 1-28...
  • Page 29 KS-FX925R 2.Terminal layout 3.Pin function LA47505 Pin No. Symbol Function Header of IC AC CONT1 Power GND GND1 Outpur(-) for front Rch OUTFR- Stand by input STBY Output (+) for front Rch OUTFR+ Power input Vcc1/2 Output (-) for rear Rch...
  • Page 30 KS-FX925R VICTOR COMPANY OF JAPAN, LIMITED MOBILE ELECTRONICS DIVISION PERSONAL & MOBILE NETWORK BUSINESS UNIT. 10-1,1Chome,Ohwatari-machi,Maebashi-city,371-8543,Japan 200205 (No.49742)

  • Page 31: Table Of Contents

    KS-FX925R PARTS LIST [ KS-FX925R ] * All printed circuit boards and its assemblies are not available as service parts. Area suffix EE --------- Russian Federation - Contents - 3- 2 Exploded view of general assembly and parts list (Block No.M1) 3- 5 Cassette mechanism assembly and parts list (Block No.MP)
  • Page 32 KS-FX925R Exploded view of general assembly and parts list Block No.
  • Page 33 KS-FX925R Parts list (General assembly) Block No. M1MM Item Parts number Parts name Q'ty Description Area --------------- CASSETTE MECHA 1 CDS-802JE1 FSYH4036-050 SHEET FSKL2001-004 MECHA BRACKET L FSKL2002-002 MECHA BRACKET R QYSDST2606Z SCREW QYSDST2606Z SCREW GE10043-002A TOP CHASSIS GE40135-001A EARTH PLATE...
  • Page 34 KS-FX925R Parts list (General assembly) Block No. M1MM Item Parts number Parts name Q'ty Description Area GE40127-001A KNOB SPRING GE40129-001A SELECT BUTTON RIM LENS GE30373-001A GE20123-001A RIM COVER GE40128-001A EJECT BUTTON VKW3001-330 COMP.SPRING 1 EJECT BUTTON GE30116-001A DETACH BUTTON COMP.SPRING...

  • Page 35: Cassette Mechanism Assembly And Parts List (Block No.mp)

    KS-FX925R Cassette mechanism assembly and parts list Block No. CDS-802JE1...
  • Page 36 KS-FX925R Parts list (Cassette mechanism) Block No. MPMM Item Parts number Parts name Q'ty Description Area X-0802-1009S MAIN CHASSIS AS X-0802-1002S SLIDE CHASSIS A X-0802-1003S SIDE BKT ASSY X-0802-1004S CASSETTE HANGER X-0802-1005S PINCH ARM F ASS X-0802-1006S PINCH ARM R ASS...
  • Page 37 KS-FX925R Parts list (Cassette mechanism) Block No. MPMM Item Parts number Parts name Q'ty Description Area 1-0802-4007S GEAR BASE SPG 1-0802-4008S REEL DRIVER SPG 1-0802-4013S COMPULSION SPG 1-0802-5001S BELT 1-0802-5002S FELT 1 7.5*18.5*1.0 1-0802-5003S AZIMUTH SCREW FELT 1 11*18.5*1.0 1-0802-5004S...
  • Page 38 KS-FX925R Grease point 1/2 FG-84M MEA-512R MEN-223 SW-902 CFD-409 CFD-250H EP-56 SW-474B...
  • Page 39 KS-FX925R Grease point 2/2...
  • Page 40 KS-FX925R Electrical parts list (Main board) Block No. 01 Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area BZ841 QAN0002-001Z BUZZER C 304 NCS31HJ-391X C CAPACITOR QERF1CM-107Z E CAPACITOR 100MF 20% 16V C 305 NCB31EK-104X...
  • Page 41 KS-FX925R Electrical parts list (Main board) Block No. 01 Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area D 702 MTZJ5.6B-T2 ZENER DIODE Q 901 DTC114EKA-X TRANSISTOR D 703 MTZJ5.6B-T2 ZENER DIODE Q 902 2SA1855/RST/-T...
  • Page 42 KS-FX925R Electrical parts list (Main board) Block No. 01 Item Parts number Parts name Remarks Area Item Parts number Parts name Remarks Area R 311 NRSA63J-273X MG RESISTOR R 805 NRSA63J-104X MG RESISTOR R 312 NRSA63J-273X MG RESISTOR R 806...
  • Page 43 KS-FX925R Electrical parts list (Mecha control board) Block No. 02 Item Parts number Parts name Remarks Area C 401 NDC31HJ-101X C CAPACITOR C 402 NDC31HJ-101X C CAPACITOR C 403 NDC31HJ-101X C CAPACITOR C 404 NDC31HJ-101X C CAPACITOR C 405 NDC31HJ-101X...
  • Page 44 KS-FX925R 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 624 NRSA02J-911X MG RESISTOR C 602 NCB31HK-103X C CAPACITOR R 625...
  • Page 45 KS-FX925R < M E M O > 3-15...

  • Page 46: Packing Materials And Accessories Parts List (Block No.m3,M5)

    KS-FX925R Packing materials and accessories parts list Block No. Block No. A1~A4 KIT:A6~A10 3-16...
  • Page 47 KS-FX925R Parts list (Packing) Block No. M3MM Item Parts number Parts name Q'ty Description Area FSPG4002-001 POLY BAG 1 INST. BOOK POLY BAG 1 KIT QPA00801205 FSYH4036-068 SHEET QPA01003003 POLY BAG 1 HARD CASE QPC03004315P POLY BAG 1 SET CARTON...

  • Page 48: Area Suffix

    KS-FX925R SCHEMATIC DIAGRAMS CASSETTE RECEIVER KS-FX925R CD-ROM No.SML200205 SOUND SOURCE TAPE Area Suffix EE --------- Russian Federation Contents Block diagram Standard schematic diagrams Printed circuit boards No.49742SCH COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD. May. 2002...
  • Page 49 MOTOR SWITCH MAIN TAPE END.STANDBY MOTOR HEAD CN402 CN403 TO SPEAKER MOTOR METAL TO CD CHANGER CONNECTOR TO REAR LINE OUT TAPE IN MODE J801 CP901 J321 STANDBY TAPE END IC401 REEL L/R F PB EQ FRONT L/R L/R R CXA2560Q DOLBY REAR L/R...
  • Page 50 KS-FX925R < M E M O >...

  • Page 51: Standard Schematic Diagrams

    KS-FX925R Standard schematic diagrams Main amp section LA47503 IC301 QAU0221-001 J321 QNN0489-001 C321 0.22 R301 C322 0.22 QNB0100-002 C308 2.2/50 C309 R302 1/50 2.2/50 TU.R 1/50 4.7u TU.L 0.1/50 2SC2412K/R/-X C318 R311 2.2/50 2SA1037AK/RS/-X R312 2.2/50 C319 R881 D353 C181 4.7/25...
  • Page 52 KS-FX925R KS-FX925R Mecha control section Q403 2SB1322/RS/-T R401 Q402 DTC114EKA-X CN403 QGF1219F1-10S 0.015 C411 R418 22/16 C409 IC401 CXA2560Q R416 1.5M IC402 LB1641 C422 CN402 VMP3501-001 0.015 C410 C425 0.01 C424 CN401 QGB1214K1-18S TAPE SIGNAL...
  • Page 53 KS-FX925R LCD & key control section LCD1 IC602 IC601 RPM7138-V4 LC75873NW CN601 ACC5V R660 QNZ0006-001 LCD1 REMOCON QLD0217-001 EN601 R661 JOG-0 QSW0976-001 JOG-1 LCDCE R662 3.3k LCDDA R663 3.3k JOG0 R653 R654 LCDCL R664 3.3k JOG1 KEY2 R652 KEY1 KEY0...
  • Page 54 KS-FX925R KS-FX925R Printed circuit boards Main board (Forward side) Main board (Reverse side) C905 CP901 L901 IC901 J321 C904 IC901 J321 C911 Q351 L901 B303 J801 J801 R910 D901 D901 R341 Q321 C327 B502 C327 C306 R901 CP401 L-CH R901...
  • Page 55 KS-FX925R Mecha control board C419 C418 R412 C413 C416 C414 C421 R416 C422 R414 C412 VR401 Q401 R415 C410 R418 VR402 R413 B402 IC401 FSMW1093A C411 R423 R422 B409 B404 CJ403 IC402 R425 CJ401 B413...
  • Page 56 KS-FX925R VICTOR COMPANY OF JAPAN, LIMITED MOBILE ELECTRONICS DIVISION PERSONAL & MOBILE NETWORK BUSINESS UNIT. 10-1,1Chome,Ohwatari-machi,Maebashi-city,371-8543,Japan 200205 (No.49742SCH)

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