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JVC KS-FX772R Service Manual

Cassette receiver
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SERVICE MANUAL
CASSETTE RECEIVER
KS-FX772R
TP/PTY
SEL
DISP
7
Contents
Safety precaution
Disassembly method
Adjustment method
Description of major ICs
COPYRIGHT
KS-FX772R
CD CHANGER CONTROL
8
MO
9
10
11
RPT
12
RND
MODE
2002 VICTOR COMPANY OF JAPAN, LTD.
TAPE
DAB
FM/AM
¢
SSM
4
CD-
CH
SCM
Area Suffix
E
Continental Europe
1-2
1-3
1-18
1-22
KS-FX772R
No.49694
Mar. 2002

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Summary of Contents for JVC KS-FX772R

  • Page 1 KS-FX772R SERVICE MANUAL CASSETTE RECEIVER KS-FX772R KS-FX772R TAPE CD CHANGER CONTROL TP/PTY FM/AM ¢ DISP MODE Area Suffix Continental Europe Contents Safety precaution Disassembly method Adjustment method 1-18 Description of major ICs 1-22 No.49694 COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.

  • Page 2: Disassembly Method

    KS-FX772R Disassembly method <Main body> Removing the front panel assembly (See Fig.1) Press the eject button in the lower right part of the front panel. Remove the front panel assembly from the body. Front panel assembly Eject button Fig.1 Joint a Removing the front chassis assembly (See Fig.2 , 3)
  • Page 3 KS-FX772R Removing the heat sink (See Fig.4) Remove the three screws A on the left side of the body. Heat sink Fig.4 Joint b Removing the bottom cover (See Fig.5 , 6) Bottom cover Prior to performing the following procedure, remove the front panel assembly, the front chassis assembly and the heat sink.
  • Page 4 KS-FX772R Removing the main board (See Fig.7 , 8) Prior to performing the following procedure, remove the front panel assembly, the front chassis assembly, the heat sink and the bottom cover. Remove the screw B, the three screws C and the...
  • Page 5 KS-FX772R Removing the control switch board (See Fig.10 ~ 12) Prior to performing the following procedure, remove the front panel assembly. Remove the four screws G attaching the rear cover on the back of the front panel assembly. Unjoint the eleven joints c with the front panel and Rear cover the rear cover.
  • Page 6 KS-FX772R 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 cassette guide (See Fig.2) Mode gear Turn the mode gear to set to RVS play or subsequent mode.
  • Page 7 KS-FX772R Cassette holder assembly Removing the cassette hanger assembly / cassette holder (See Fig.4 to 7) Check the mode is set to EJECT. Push down the Boss d Side bracket Cassette hanger front part of the cassette holder and move in the assembly direction of the arrow to release the joint c.
  • Page 8 KS-FX772R Removing the side bracket assembly Side bracket assembly (See Fig.8 to 10) Joint i Remove the screw A attaching the side bracket assembly. Joint j Detach the front side of the side bracket assembly upward and pull out forward to release the joint i and j in the rear.
  • Page 9 KS-FX772R Removing the pinch arm (F) assembly (See Fig.11 and 12) 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.11...
  • Page 10 KS-FX772R Removing the head / tape guide (See Fig.16 and 17) 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 B, the head and the head...
  • Page 11 KS-FX772R Disassembling the flywheel assembly (F) (See Fig.20 and 21) Push and turn counterclockwise the spring holder (F) Flywheel assembly (F) Flywheel assembly (R) to release the three joints p on the bottom of the flywheel. The spring holder (F), the TU spring and the friction gear play come off.
  • Page 12 KS-FX772R Removing the gear base arm / gear base Gear base arm Joint t link assembly (See Fig.25 to 27) Joints s Move the gear base arm in the direction of the arrow. Hook u Insert a slotted screwdriver to the gear base spring...
  • Page 13 KS-FX772R Mode gear Mode switch actuator Removing the mode gear (See Fig.28 and 31) Remove the polywasher on the bottom and pull out the mode gear. Removing the mode switch actuator Polywasher (See Fig.28, 29 and 31) Pull out the mode switch actuator at the bottom.
  • Page 14 KS-FX772R Slot e' Removing the gear base assembly / take up gear / reflector gear (See Fig.32 to 34) Push in the pin d’ 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-FX772R Removing the side bracket assembly (See Fig.35 to 39) Remove the eject cam plate spring. Push the joint f‘ through the slot to remove the load rack downward. Joint f' Move the eject cam limiter in the direction of the arrow to release it from the boss g’...
  • Page 16 KS-FX772R Main motor Removing the main motor assembly / assembly sub motor assembly (See Fig.40 to 42) 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-FX772R Adjustment method Tuner area Test Instruments reqired for adjustment Band range 1.Digital osclloscope(100MHz) FM : 87.5MHz to 108.0MHz 2.Frequency Counter meter AM : (MW) 522kHz to 1620 kHz 3.Electric voltmeter (LW) 144kHz to 279 kHz 4.Wow & flutter meter 5.Test Tapes...
  • Page 18 KS-FX772R 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 1-19...
  • Page 19 KS-FX772R Arrangment of adjusting VR402:Rch VR401:Rch (Dolby NR level adj) (Dolby NR Frequency response adj) Head amplifier board section (Reverse side) C418 R412 C413 C419 C416 C414 R416 C421 C422 R414 C412 VR401 Q401 R415 C410 R418 VR402 R413 B402...
  • Page 20 KS-FX772R 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. After installing the cassette housing, perform the azimuth adjustment.

  • Page 21: Description Of Major Ics

    KS-FX772R Description of major ICs HA13164A(IC901):Regulator 1.Terminal layout 2.Block diagram Surge Protector BIAS UNIT R: note1) TAB (header of IC) connected to GND 3.Pin function Pin No. Symbol Function Output voltage is VCC-1 V when M or H level applied to CTRL pin.
  • Page 22 KS-FX772R CXA2559Q(IC401):Playback equalizer amplifier with music sensor 1.Pin layout 2.Blockdiagram 24dB 100k 7k/12k 300k MS MODE BIAS MUTE TAPE EQ FWD/RVS MS ON/ 300k 7k/12k 100k 24dB 3.Pin function Pin No. Symbol Function PBTC1 Terminal of capacity of reproduction equalizer reproduction...
  • Page 23 KS-FX772R UPD178018AGC625(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 24 KS-FX772R UPD178018AGC625(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 I2C information clock output...
  • Page 25 KS-FX772R 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 Stand by Switch...
  • Page 26 KS-FX772R 2.Terminal layout 3.Pin function LA4743K Pin No. Symbol Function Header of IC Power GND Outpur(-) for front Rch RROUT- STANDBY Stand by input Output (+) for front Rch RROUT+ Power input FROUT- Output (-) for rear Rch Power GND...
  • Page 27 KS-FX772R LC75823W (IC651) : LCD driver 1. Pin Layout & Symbol COM1 COM2 COM3 CLOCK DATA 2. Pin Function Pin No. Symbol Function 1 to 2 Non connected 3 to 52 S1 to S52 Segment output pins used to display data transferred by serial data input.
  • Page 28 KS-FX772R SAA6579T-X(IC71):RDS 1.Pin layout DATA 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 SYMBOL COMPARATOR DECODER FIXED DIVIDER...
  • Page 29 KS-FX772R TEA6320T-X (IC161) : E.volume 1.Pin layout 2.Block diagram VOLUME 2 MUTE 0 to 55 dB FUNCTION BALANCE OUTRR OUTRL ZERO CROSS FENDER REAR POWER DETECTOR OUTFR OUTFL SUPPLY VOLUME 1 BASS TREBLE +20 to -31 dB VOLUME 2 LEFT...
  • Page 30 KS-FX772R 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 31 KS-FX772R MOTOR SWITCH MAIN TAPE END.STANDBY MOTOR HEAD CJ402 CJ403 TO SPEAKER TO CD CHANGER MOTOR CONNECTOR TO REAR LINE OUT TAPE IN MODE J801 CP901 STANDBY J321 PHOTO IC401 REEL L/R F PB EQ L/R R DOLBY IC301 MS OUT...

  • Page 32: Standard Schematic Diagrams

    KS-FX772R Standard schematic diagrams Receiver & System control section LA4743K IC301 J321 QNN0175-001 QAU0259-001 C323 C321 150p C324 C325 R301 C322 150p C308 2.2/50 QNB0100-002 C326 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...
  • Page 33 KS-FX772R KS-FX772R Mecha control circuit section Q403 2SB1322/RS/-T R401 Q402 CJ403 DTC114EKA-X QGF1219F1-10 0.015 C411 R418 22/16 C409 IC401 CXA2559Q R416 1.5M IC402 LB1641 C422 CJ402 0.015 C410 C425 0.01 C424 CJ401 QGB1214K1-18S Cassette signal...
  • Page 34 KS-FX772R LCD driver & Operation switch section LCD1 CP701 QLD0224-002 VMC0335-001 R663 R664 Q661 2SD601A/R/-X Q663 2SD601A/R/-X C662 C664 100P 100P COM1 R651 COM2 1.5k COM3 C651 0.01 IC651 D655 D654 C652 4.7/6.3 LC75823W MA152WK-TX MA152WK-TX R662 R661 R665 R666...
  • Page 35 KS-FX772R KS-FX772R Printed circuit boards Front board(Forward side) R663 R618 D601 GEB10035A R664 S621 Q662 D609 S601 R644 R661 Q664 C654 S604 C663 D606 R639 S613 Q661 D616 D619 R638 R662 R645 Main board C661 S620 R607 LCD1 S608 D617...