JVC KS-FX772R Service Manual Download | Manualshive

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1-18

KS-FX772R

Adjustment method

1.Digital osclloscope(100MHz)

Measuring conditions(Amplifier section)

Power supply voltage

Load impedance

Line out level / Impedance

for DOLBY level measurement

For playback frequency measurement

For wow flutter & tape speed measurement

For head azimuth measurement

Cassette type for CTG-N
(mechanism adjustment)

DC14.4V(11V to 16V allowance)

4 (4 to 8 allowance)

2.0V / 20k

Tuner area

Band range

FM : 87.5MHz to 108.0MHz

AM : (MW) 522kHz to 1620 kHz
(LW) 144kHz to 279 kHz

DUMMY LOAD

Exclusive dummy load should be used for AM
and FM dummy load,there is a loss of 6dB
between SSG output and antenna input. The
loss of 6dB need not be considered since
direct reading of figures are applied in this
working standard.

Test Instruments reqired for adjustment

2.Frequency Counter meter
3.Electric voltmeter
4.Wow & flutter meter
5.Test Tapes

VT724

VT739

VT712

VT703

6.Torque gauge

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Summary of Contents for KS-FX772R

Page 1: ...Y OF JAPAN LTD KS FX772R KS FX772R CD CHANGER CONTROL SEL TP PTY DISP SSM 4 FM AM TAPE CD CH DAB SCM MODE 7 8 9 10 11 12 RND RPT MO KS FX772R Area Suffix E Continental Europe Contents Safety precaution Disassembly method Adjustment method Description of major ICs 1 2 1 3 1 18 1 22 ...

Page 2: ... following procedure remove the front panel assembly Release the four joints a on both sides of the front chassis assembly and remove the front chassis assembly toward the front 1 Removing the front chassis assembly See Fig 2 3 Disassembly method Main body Fig 1 Fig 2 Fig 3 Front panel assembly Eject button Joint a Joint a Front chassis assembly Front chassis assembly Heat sink Joint a Joint a ...

Page 3: ... remove the front panel assembly the front chassis assembly and the heat sink Turn over the body and unjoint the five joints b with the bottom cover and the body using a screwdriver 1 Removing the bottom cover See Fig 5 6 Fig 4 Fig 5 Fig 6 Heat sink A A Joint b Joint b Joint b Joint b Joint b Joint b Bottom cover Bottom cover Rear panel Rear panel ...

Page 4: ...bottom of the body Disconnect connector CN701 on the main board in the direction of the arrow 1 2 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 the bottom cover and the main board Remove the four screws F attaching the cassette mechanism section on the back of the top chassis 1 Removing the c...

Page 5: ...e back of the front panel assembly Unjoint the eleven joints c with the front panel and the rear cover Remove the control switch board on the back of the front panel 1 2 3 Removing the control switch board See Fig 10 12 Fig 10 Fig 11 Fig 12 G G G G Rear cover Joint c Joint c Joint c Joint c Front panel Rear cover Front panel Control switch board ...

Page 6: ...g 2 Prior to performing the 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 REFERENCE Remove the E washer attaching the load arm Move the load arm in the direction of the arrow and release the joint b on the cassette catch 1 2 Removing the load arm See Fig 3 Fig 1 Fig 2 Mode gear Cassette guide Tab a Tab a Fig 3...

Page 7: ... hanger assembly Bring up the rear side of the cassette hanger assembly to release the joint g and h Pull out the cassette catch from the cassette hanger assembly 1 2 3 4 5 Removing the cassette hanger assembly cassette holder See Fig 4 to 7 Fig 4 Fig 5 Fig 7 Fig 6 Cassette holder assembly Cassette holder assembly Side bracket Joints c Cassette holder assembly Cassette hanger assembly Cassette han...

Page 8: ...ly See Fig 8 to 10 When reassembling make sure that the boss k of the main chassis is set in the notch of the load rack under the side bracket assembly Do not reattach the load rack on the boss k CAUTION After reattaching the side bracket assembly confirm operation CAUTION Fig 9 Fig 10 Fig 8 A Side bracket assembly Side bracket assembly Joint i Joint j Side bracket assembly Boss k Load rack Boss k...

Page 9: ...assis Remove the rack link 1 2 Removing the slide chassis assembly See Fig 14 and 15 When reassembling first reattach the rack link and next fit the boss m and hook n of the slide chassis assembly to the hole of the main chassis and engage the two joints l CAUTION It is not necessary to remove the head and the tape guide REFERENCE Fig 11 Fig 15 Fig 12 Fig 13 Fig 14 Polywasher Polywasher Pinch arm ...

Page 10: ...mbly F R See Fig 18 and 19 When reattaching the pinch arm spring set both end of it to the pinch spring arm remarked o CAUTION When reattaching the head set the wires into the groove of the tape guide Fig 16 CAUTION It is not necessary to remove the slide chassis assembly REFERENCE It is not necessary to remove the slide chassis assembly REFERENCE Fig 17 Fig 19 Fig 16 Fig 18 B Slide chassis assemb...

Page 11: ...ttaching the reel board Move the reel board in the direction of the arrow to release the joint r Unsolder the wires if necessary 1 2 3 Removing the reel board See Fig 23 and 24 When reattaching confirm operation of the MODE switch and the ST BY switch The mode position between EJECT and ST BY is optimum for reattaching Connect the card wire extending from the reel board to the FFC pad before reatt...

Page 12: ...ion of the arrow to release the two joints t 1 2 3 4 Removing the gear base arm gear base link assembly See Fig 25 to 27 Push each joint hook u of the FFC pad and remove toward the bottom 1 Removing the FFC pad See Fig 27 and 29 When reattaching the gear base arm make sure that the boss on the gear base assembly is inside the gear base spring REFERENCE Fig 25 Fig 26 Fig 27 FFC pad Gear base link a...

Page 13: ...g 30 REFERENCE Pull out the mode switch actuator at the bottom 1 Removing the mode switch actuator See Fig 28 29 and 31 When reattaching the mode switch actuator to the main chassis make sure to set on the shaft and insert v into the slot w REFERENCE When reattaching the direction plate engage the two joints a and move in the direction of the arrow Refer to Fig 30 REFERENCE When reattaching the di...

Page 14: ...2 to 34 Draw out the reel driver from the shaft on the main chassis and remove the reel driver spring and the reel spindle respectively 1 Removing the reel driver reel spindle See Fig 34 The reel driver is damaged when removed Please replace with a new one CAUTION The parts are damaged when removed Please replace with new ones REFERENCE Fig 32 Fig 33 Fig 34 Gear base assembly Pin d Slot e Slot e P...

Page 15: ...release the joint i 1 2 3 4 Removing the side bracket assembly See Fig 35 to 39 When reassembling confirm operation of each part before reattaching the eject cam plate spring CAUTION Fig 35 Fig 37 Fig 39 Fig 36 Fig 38 Joint f Load rack Eject cam plate spring Eject cam limiter Side bracket assembly Boss g Joint h Load rack Joint f Joint h Boss g Eject cam limiter Side bracket assembly Joint h Joint...

Page 16: ...moving the main motor assembly sub motor assembly See Fig 40 to 42 When reassembling adjust the length of the wires extending from the sub motor asswmbly by attaching them to the side of the sub motor assembly with the wires extending from the main motor assembly using a spacer CAUTION Fig 40 Fig 41 Fig 42 Belt Polywasher Polywasher Polywasher Mode gear Reduction gear A Main motor assembly D Sub m...

Page 17: ...4 4V 11V to 16V allowance 4 4 to 8 allowance 2 0V 20k Tuner area Band range FM 87 5MHz to 108 0MHz AM MW 522kHz to 1620 kHz LW 144kHz to 279 kHz DUMMY LOAD Exclusive dummy load should be used for AM and FM dummy load there is a loss of 6dB between SSG output and antenna input The loss of 6dB need not be considered since direct reading of figures are applied in this working standard Test Instrument...

Page 18: ...n view Cassette mechanism Surface Arrangement of adjusting test points Motor assembly Tape speed adjust Playback head Azimuth screw B Reverse Azimuth screw B Reverse Azimuth screw A Forward Azimuth screw A Forward Playback Head ...

Page 19: ...ll 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 3 Extension cord EXTKSRT002 18P 18 pin extension cord For connection between mechanism assembly and main board assembly Check for mechanism driving section such as motor etc Disassembly...

Page 20: ...fication adjust the motor with a built in volume resistor 1 2 Play test tape VT724 and set the volume position at 2V Play test tape VT739 and confirm 1kHz 10kHz 1 3dB 1kHz 63Hz 0 3dB When 10kHz is out of specification it will be necessary to read adjust the azimuth 1 2 3 Load VT724 1kHz and play it back in the reverse play mode Set the Rch output level to max Load VT703 10kHz and play it back in t...

Page 21: ...n M or H level applied to CTRL pin Output voltage is VCC 1 V when M or H level to CTRL pin and H level to ANT CTRL Connected to ACC Regular 5 6V Output voltage is 5V when M or H level applied to CTRL pin Output for ACC detector L ANT output OFF H ANT output ON Connected to VCC Low battery detect Output voltage is 9V when M or H level applied to CTRL pin L BIAS OFF M BIAS ON H CD ON Output voltage ...

Page 22: ...out output terminal Time constant for the HLS Non connected Detection LPF terminal between tunes Detection level set terminal between tunes Detection level set terminal between tunes Time constant connection terminal for the detection between tunes Detection output terminal between tunes Non connected Dolby NR control Mute function control terminal Reproduction equalizer control terminal Head chan...

Page 23: ...utput to LCD driver I O selector output for J BUS H OUT L INPUT Door open detect input J BUS Data input J BUS Data output J BUS Clock in output Non connect Non connect Non connect Non connect Non connect Non connect Port GND Port Vdd Non connect AF check output L AF check Monaural on off selecting output H mono on FM AM switching output L FM H AM Auto seek stop selecting output H Seek L Stop Pulse...

Page 24: ...ion input Sub motor clock opposite detection drive output Mechanism mode position detection input Cassette in detection input H cassette in L cassette out Standby position detection input H eject side L operation side Non connect Non connect Non connect Non connect Non connect Non connect Mute output L mute on Power ON OFF switching output H power on Telephone mute signal detection input Non conne...

Page 25: ...UT 2 PWR GND2 R F IN 3 IN 4 PRE GND ON TIME C Muting ON Time Control Circuit Protective circuit Protective circuit Mute circuit Ripple Filter Stand by Switch N C 0 22 F 2200 F 0 022 F 0 22 F TAB 5V ST ON 47 F 0 22 F 0 22 F 22 F Mute 10K 3 3 F OUT 3 OUT 3 Low Level Mute ON PWR GND3 OUT 4 OUT 4 PWR GND4 LA4743K IC301 Power AMP 1 Block diagram ...

Page 26: ... 21 22 23 24 25 Symbol Pin No Function Header of IC Power GND Outpur for front Rch Stand by input Output for front Rch Power input Output for rear Rch Power GND Output for rear Rch Ripple filter Rear Rch input Front Rch input Signal GND Rear Lch input Front Lch input Power on time control Output for rear Lch Power GND Output for rear Lch Power input Output for front Lch Muting control input Output...

Page 27: ...OM1 to COM3 L INT H VDD on Serial data can be transferred in display off mode Non connected Oscillator connection An oscillator circuit is formed by connecting an external resistor and capacitor at this pin Serial data CE Chip enable interface connection to the controller CLOCK Sync clock DATA Transfer data NC S1 to S52 COM1 to COM3 VDD INH NC OSC CE CLOCK DATA Pin No Symbol I O Function OSC CE IN...

Page 28: ...Vref MUX Vdd GND CIN SCOUT 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 CLK OSCO OSCI Vdd GND TEST MODE Symbol DATA Vref MUX Vdd GND CIN SCOUT MODE TEST GND Vdd OSCI OSCO CLK Pin No 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Description Non connected RDS data output Reference voltage output 0 5VDDA Multiolex signal input 5V supply voltage for analog part Ground for analog part 0V Subcarrier input to compara...

Page 29: ...TE ICL IMO IBL IAL Serial data input output Ground output left rear output left front Treble control capacitor left channel or input from an external equalizer Bass control capacitor left channel or output to an external equalizer Bass control capacitor left channel Input volume 1 left control part Input loudness left control part Output source selector left channel Not used Not used Input C left ...

Page 30: ...ow level X Irrelevant Z Off High impedance State a 3 state input Output C L H H A X L H Y Z H L 1 2 3 4 5 6 7 1C 1A 1Y 2C 2A 2Y GND VU 4C 4A 4Y 3C 3A 3Y 14 13 12 11 10 9 8 HD74HC126FP X IC801 Buffer 1 Terminal layout 2 Block diagram 3 Pin function 1 2 3 4 5 6 7 8 9 10 GND OUT1 P1 VZ IN1 IN2 VCC1 VCC2 P2 OUT2 Input Output Mode IN1 IN2 OUT1 OUT2 Brake 0 0 0 0 1 0 1 0 0 1 0 1 1 1 0 0 CLOCKWISE COUNTE...

Page 31: ... JBUS SO JBUS I O JBUS SCK SCK SI SO CD RCH CD LCH TUNER L R OUT LR OUT RR OUT LF OUT RF L R F L R R LRO RRO CP401 J801 CP901 J321 KEY 0 2 CJ601 S3 S52 COM0 COM3 CP701 TAPE L R F R MODE STANDBY FF REW MOTOR SUB02 01 TAPE IN DOLBY MS REEL SUBMO SUBMO LCH RCH DOLBY CE CLOCK DATA F R MS OUT LCH RCH FF REW MOTOR TAPE IN MODE STANDBY REEL PHOTO CJ401 CJ403 CJ402 J1 AM FM TO CD CHANGER TO SPEAKER CONNEC...

Page 32: ...K 2 2 50 UPD178018AGC625 2SA1855 RST T 2 2 50 2 2 50 2 2 50 1SS355 X QNZ0095 001 270 270 270 2 2 50 100 100k 100k 10k 330k 100 10k 10k 10k LA4743K 47p QAX0406 002Z 27P 27P 390 10k 10k 0 1 4 7k 4 7k 4 7k 4 7k 4 7k 4 7k 0 1 0 1 0 1 0 1 0 1 HA13164 1SS355 X 330p 1SS355 X 47p 2SD1048 6 7 X 10k 1SS355 X CRS03 W 1SS355 X 2 2 50 1SS355 X 12k QNN0175 001 47k 0 1 SAA6579T X 150k 470 2 2 50 2 2 50 2 2 50 2 ...

Page 33: ...4 R404 C403 C402 R411 VR402 R413 C407 C417 R422 R423 D402 R403 R425 C423 R424 R412 R417 R402 C401 C405 C408 0 015 QGB1214K1 18S 22 16 0 015 1 5M 0 1 DTC114EKA X 2SB1322 RS T LB1641 0 01 0 1 680 15k CXA2559Q QGF1219F1 10 0 1 0 1 0 1 MA3051 M X 33k 12k 22 16 24k 0 47 50 0 01 220P 24k 3 9k 100P 0 01 22k 180 180 100k 100P 100k 100P 100P 12k 33k 18k 100P 0 1 3 3k 47k DSK10C T1 100k 33 10 16 3 3k 100 10...

Page 34: ...2k 820 820 820 820 1 2k QLD0224 002 RPM6938 SV4 VMC0335 001 MA152WK TX MA152WK TX MA152WA TX 1k 820 MA152WA TX 1 8k 2 7k 1 8k 3 9k 2 7k 1 8k 2 7k 680 680 560 1k 560 100P 100P 2SD601A R X 2SD601A R X UDZS6 2B X UDZS6 2B X 3 9k SMLU12E16W 180K 680 680 390 820 2 2k 2 2k 390 MA3062 390 390 1 2k 1 2k 1k 1k 4 7 6 3 47 10K 1k 1k 10K 10K 10K 2 2 6 3 2 2 6 3 2SD601A R X 2SD601A R X OSC CE INH DATA CLOCK S3...

Page 35: ...4 D709 D705 D706 D707 D708 B808 B935 B809 B940 B943 B917 B807 D242 B944 B939 B938 B934 B930 B826 B931 B825 D241 Q53 B921 B923 B924 B820 B959 B925 B806 R60 D3 B904 B929 B926 B824 Q10 D4 R307 B822 Q701 R748 B813 B928 B936 B827 R308 C713 B823 B920 R309 B816 C910 C318 C309 C308 C319 R714 R750 C911 C714 R709 IC301 B960 R910 B953 B957 B909 B817 B918 B804 C78 B912 B811 C717 B814 B941 B942 R751 R752 B818 ...

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