JVC CA-MXGT80 Page 47 Service Manual Download

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MX-GT80/MXGT90

1-47

L-IN1

L-IN2

L-IN3

L-IN4

R-IN1

R-IN2

R-IN3

R-IN4

MUXOUT

INR

TREBLE(R)

MIN(R)

MOUT(R)

BIN(R)

BOUT(R)

CREF

AGND

ROUT

DIG-GND

SDA

SCL

LOUT

BOUT(L)

BIN(L)

T(L)

MIN(L)

TREBLE(L)

INL

MUXOUT

VOLUME

TREBLE

MIDLE

SPEAKER

ATT

RIGHT

SPEAKER

ATT

LEFT

BASS

SUPPLY

I C BUS DECODER LATCHES

0/30dB

2dB STEP

INPUT

MULTIPLEXER

GAIN

CSL
DIG GND
TREBLE(R)
TREBLE(L)
MIN(L)
MOUT(L)
BOUT(L)
BIN(L)
BOUT(R)
BIN(R)
MOUT(R)
MIN(R)
INR
MUXOUTR
INL

SDA

CRE

AGND

ROUT

LOUT

R-IN4
R-IN3
R-IN2
R-IN1

L-IN1
L-IN2
L-IN3
L-IN4

MUXOUTL

TDA7439

TDA7439 (IC436) : Control volume

1.Pin layout

2.Block diagram

Summary of Contents for CA-MXGT80

Page 1: ... 1 3 1 4 1 5 1 6 1 28 Flow of functional operation until TOC read Maintenance of laser pickup Replacement of laser pickup Description of major ICs 1 32 1 33 1 33 1 34 Contents Each different point CD DECK RECEIVER CA MXGT80 CA MXGT90 Model MX GT80 MX GT90 SPEAKER SP MXGT80 SP MXGT90 OUTPUT POWER SUB WOOFER MAIN SPEAKER 70W ch 55W ch 130W ch 160W ch PLAY EXCHANGE STANDBY ON CD R RW PLAYBACK STANDBY...

Page 2: ...e currnet check Electrical shock hazard testing After re assembling the product always perform an isolation check on the exposed metal parts of the product antenna terminals knobs metal cabinet screw heads headphone jack control shafts etc to be sure the product is safe to operate without danger of electrical shock Do not use a line isolation transformer during this check Plug the AC line cord dir...

Page 3: ...nlig laserstrålning är denna del är öppnad och spårren är urkopplad Betrakta ej strålen VARO Avattaessa ja suojalukitus ohitettaessa olet alttiina näkymättömälle lasersäteilylle Älä katso säteeseen ADVARSEL Usynlig laserstråling ved åbning når sikkerhedsafbrydere er ude af funktion Undgå udsættelse for stråling ADVARSEL Usynlig laserstråling ved åpning når sikkerhetsbryteren er avslott unngå utset...

Page 4: ... source can easily destroy the laser diode 4 Handling the traverse unit optical pickup 1 Do not subject the traverse unit optical pickup to strong shocks as it is a sensitive complex unit 2 Cut off the shorted part of the flexible cable using nippers etc after replacing the optical pickup For specific details refer to the replacement procedure in the text Remove the anti static pin when replacing ...

Page 5: ...125V for F101 and F102 This symbol specifies type of fast operating fuse Precaution Pour eviter risques de feux remplacez le fusible de surete de F001 comme le meme type que 5A 125V et 6A 125V pour F101 et F102 Ce sont des fusibles suretes qui functionnes rapide Importance administering point on the safety F001 F101 F102 ...

Page 6: ...h sides of the body Remove the metal cover from the body by lifting the rear part of the cover 1 2 3 Disassembly method Main body Removing the metal cover See Fig 1 to 3 Do not break the front panel tab fitted to the metal cover CAUTION Fig 1 Fig 2 Fig 3 A A A Metal cover Metal cover B Metal cover B ...

Page 7: ...ism assembly Disconnect the card wires from connector CN870 CN871 and CN315 on the main board respectively Remove the tie band and disconnect the wire from connector CN703 on the amplifier board Disconnect the wire from connector CN220 on the transformer board 1 2 3 Removing the front panel assembly See Fig 6 to 10 To prevent damage to the CD fitting be sure to pull both the rear panel and the fro...

Page 8: ...the body Release the two joints a on the lower right and left sides of the body using a screwdriver and remove the front panel assembly toward the front 4 5 Fig 8 Fig 9 Fig 10 E Bottom Front panel assembly Joint a Joint a Front panel assembly Front panel assembly ...

Page 9: ...e CD changer mechanism assembly Remove the screw G attaching the rear cover on the back of the body Push each tab of the four joints b in the direction of the arrow and release Remove the eleven screws F attaching the rear panel Release the joints c on each lower side of the rear panel using a screwdriver and remove the rear panel backward 1 2 3 4 Removing the rear cover rear panel See Fig 12 to 1...

Page 10: ...tor CN211 and CN212 on the main board from the regulator board 1 2 3 4 Removing the main board See Fig 16 and 17 Prior to performing the following procedure remove the metal cover the CD changer mechanism assembly and the rear panel Disconnect connector CN217 on the speaker board from the regulator board 1 Removing the speaker board See Fig 18 It is not necessary to remove the main board REFERENCE...

Page 11: ... voltage board from the regulator board The heat sink and heat sink bracket will be detached at once Pull out the upper and lower heat sink brackets from the heat sink respectively Remove the four screws I attaching the amplifier board to the heat sink Remove the two screws J the board bracket and the voltage board 1 2 3 4 5 6 Removing the amplifier board voltage board heat sink See Fig 19 and 20 ...

Page 12: ...wire from connector CN204 on the regulator board Remove the two screws L attaching the regulator board 1 2 Removing the regulator board See Fig 23 Prior to performing the following procedure remove the metal cover the CD changer mechanism assembly and the rear panel Disconnect the wire from connector CN250 on the transformer board Remove the tie band from the voltage board Move the power cord stop...

Page 13: ...rews O attaching the display system control board If necessary disconnect the wire from connector CN911 on the front side of the display system control board and unsolder FW915 If necessary remove the CD play board Fig 28 1 2 3 4 Removing the display system control board See Fig 25 to 27 Remove the three screws P attaching the CD eject board If necessary unsolder FW915 on the CD eject board 1 2 Re...

Page 14: ...switch board Pull out the volume knob on the front panel and remove the nut Pull out the surround mode knob and the surround woofer level knob toward the front Remove the twelve screws R attaching the operation switch board Remove the screw R attaching the earth terminal extending from the switch board Release each tab of the seven joints g retaining the operation switch board 1 2 3 4 Removing the...

Page 15: ...of the body Disconnect the wire from two speaker terminals of the speaker tweeter 1 2 Removing the speaker tweeter See Fig 2 Prior to performing the following procedures remove the front panel Remove the four screws C attaching the speaker squawker on the front of the body Disconnect the wire from the two speaker terminals of the speaker squawker 1 2 Removing the speaker squawker See Fig 3 Speaker...

Page 16: ...t the wire from the two speaker terminals 1 2 3 Removing the speaker woofer See Fig 4 and 5 Prior to performing the following procedures remove the front panel Remove the six screws F attaching the sub panel on the back of the front panel Remove the sub panel toward the front 1 2 Removing the sub panel See Fig 6 Attention When reassembling the punch panel need to put glue all around this is import...

Page 17: ...ont panel Remove the two screws B attaching the speaker tweeter on the back of the front panel 1 Removing the speaker tweeter See Fig 3 Prior to performing the following procedures remove the front panel Remove the six screws C attaching the sub panel on the back of the front panel Pull out the sub panel toward the front 1 2 Removing the sub panel See Fig 4 Speaker section 2 SP MXGT90 Fig 1 Fig 2 ...

Page 18: ...y Remove the speaker woofer toward the front and disconnect the wire from the two speaker terminals 1 2 3 Removing the speaker woofer See Fig 6 and 7 Remove the four screws G attaching the duct on the upper side of the body Move the duct upwards and pull out backward Caution When servicing SP MXGT90 speaker system never push or pull the speaker system on the table or floor It will damage the leg c...

Page 19: ...See Fig 4 By removing the pawl at the section d fixing the return spring dismount the return spring See Fig 4 Remove the three lock levers See Fig 4 10 11 Fig 1 Fig 2 Fig 3 Fig 4 1 Remove the metal cover 2 Remove the CD changer mechanism assembly 3 From bottom side the CD changer mechanism assembly remove the four screws A retaining the CD servo control board 4 Absorb the four soldered positions a...

Page 20: ... 14 15 Manually turn the motor pulley in the clockwise direction until the lifter unit stopper is lowered from the section e of CD tray assembly See Fig 8 Pull out all of the three stages of CD tray assembly in the arrow direction f until these stages stop See Fig 6 At the position where the CD tray assembly has stopped pull out the CD tray assembly while pressing the two pawls g and g on the back...

Page 21: ...irection k By raising the CD loading mechanism assembly in the arrow direction l remove the assembly from the lifter unit Fig 10 Fig 12 Fig 11 Fig 13 Removing the CD pick unit See Fig 13 1 2 3 4 Move the cam gear in the arrow direction m Then the CD pickup unit will be moved in the arrow direction n According to the above step shift the CD pickup unit to the center position While pressing the stop...

Page 22: ...he cam gear q align the Paul r position of the drive unit to the notch position Fig 16 on the cam gear q Pull out the drive unit and cylinder gear See Fig 17 While turning the cam gear q align the Paul s position of the select lever to the notch position Fig 18 on the cam gear q Remove the four screws H retaining the cam unit cam gear q and cams R1 R2 assembly See Fig 18 Cam gear q Drive unit r G ...

Page 23: ...cket in the arrow direction remove the gear bracket See Fig 18 From the notch u section on the chassis assembly fixing the edge of gear bracket remove and take out the gear bracket See Fig 19 Remove the belts respectively from the right and left actuator motor pulleys and pulley gears See Fig 18 After turning over the chassis assembly remove the actuator motor while spreading the four pawls v fixi...

Page 24: ...d cam gear q See Fig 22 1 2 3 4 Remove the slit washer fixing the cams R1 and R2 assembly By removing the two pawls w fixing the cam R1 separate R2 from R1 Remove the slit washer fixing the cam gear q Pull out the cam gear q from the C G base assembly Removing the C G base assembly See Fig 22 and 23 Remove the three screws J retaining the C G base assembly Fig 23 Slit washer Pawl Cam R2 Slit washe...

Page 25: ...zimuth screw retaining the playback head 7 Take out the playback head from the front of the head mount 8 The recording and eraser heads should also be removed similarly according to Steps 1 7 above Reassembling the playback recording and eraser heads See Fig 3 1 Reassemble the playback head from the front of the head mount to the position as shown in Fig 3 2 Fix the reversing azimuth screw 3 Set t...

Page 26: ...or assembly See Fig 5 to 7 1 Remove the six screws B retaining capstan motor assembly See Fig 5 2 While raising the capstan motor remove the capstan belts A and B respectively from the motor pulley See Fig 6 Caution 1 Be sure to handle the capstan belts so carefully that these belts will not be stained by grease and other foreign matter Moreover these belts should be hand while referring to the ca...

Page 27: ... b fixing the capstan shafts R and L and pull out the flywheels R and L respectively from behind the cassette mechanism Removing the reel pulse board and solenoid See Fig 11 1 Remove the five pawls c d e f g retaining the reel pulse P C Board 2 From the surface of the reel pulse P C Board parts remove the two pawls h and i retaining the solenoid Capstan motor Joint bracket Flywheel R Flywheel L Fl...

Page 28: ... FM modulation frequency 400Hz Frequency displacement 22 5kHz Frequency Range AM 531kHz 1710kHz FM 87 5MHz 108MHz Standard measurement positions of volume and switch Power Standby Light STANDBY Indicator Sub woofer VOL Minimum Sound mode OFF Main VOL 0 Minimum Traverse mecha set position Disc 1 Mic MIX VOL MAX ECHO OFF Precautions for measurement 1 Apply 30pF and 33kohm to the IF sweeper output si...

Page 29: ... section Back side Cassette Mechanism Unit Section Head azimuth adjusting screw Forward side Head azimuth adjusting screw Reverse side Head azimuth adjusting screw Forward side Head azimuth adjusting screw Reverse side Playback head Playback recording and eraser heads or playback head Tape speed ADJ Bias ADJ L Bias ADJ R ...

Page 30: ...e recorder section Items Measurement conditions Measurement method Standard values Adjusting positions After setting to the double speed motor confirm that the frequency counter reading becomes 4 800 400 300Hz when the test tape VTT712 3kHz has been play back with the playback mechanism When the test tape VTT712 3kHz has been played back with the playback mechanism or recording and playback mechan...

Page 31: ...terminal Both recording and headphone terminals Reference frequency 1kHz and 10kHz REF 20dB Test tape TYP AC 225 Measurement input terminal OSC IN AC 225 4 20 A Output deviation between 1kHz and 10kH 1dB 2dB LcH VR101 RcH VR201 LcH VR101 RcH VR201 Electrical performance Items Measurement conditions Measurement method Standard values Adjusting positions 1 While changing over to and from BIAS 1 and ...

Page 32: ...shes Automatic measurement of TE amplitude and automatic tuning of TE balance 500mv div 2ms div Fig 1 Approx 3sec pin 25 of IC601 TE Approx 1 8V VREF Tracking error waveform at TOC reading Power ON Play Key Confirm that the Focus error S cuve signal at the pin28 of IC651 is approx 2Vp p Confirm that the signal from pin24 IC651 is 0V as a accelerated pulse during approx 400ms Confirm the waveform o...

Page 33: ...life of the laser diode has expired the following symptoms will appear 1 The level of RF output EFM output ampli tude of eye pattern will below Is the level of RFOUT under 1 25V 0 22Vp p Replace it NO YES O K 3 Semi fixed resistor on the APC PC board The semi fixed resistor on the APC printed circuit board which is attached to the pickup is used to adjust the laser power Since this adjustment shou...

Page 34: ...ack amplifier input R1 R2 I Playback amplifier input NF2 Playback amplifier negative feedback OUT2 Playback amplifier output EQ2 I Equalizer CTL2 I Pre Amplifier input switching time constant RIN2 I Recording amplifier input RNF2 I Recording amplifier negative feedback ROUT2 O Recording amplifier output O LC I ALC low cut LPF I ALC low pass filter GND I Vcc Power supply RF I Ripple filter EQCTL EQ...

Page 35: ...1 1 IN1 2 IN1 3 VEE 4 BA15218F XE IC652 BA15218N IC481 501 502 526 546 571 Dual op amp 1 Pin layout 2 Block diagram Q19 Q17 Q16 OTHER CH R9 R6 R8 R7 R5 R4 R3 R2 R1 D1 C1 Q18 Q13 Q11 Q8 Q5 Vcc VEE OUTPUT IN IN Q1 Q3 Q4 Q2 C2 Q9 Q6 Q7 Q10 Q12 Q14 Q15 Q114 ...

Page 36: ... B S W P B S W G R E C S W C O N T G N D V c c 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 COUNTER CLOCKWISE Brake LB1641 IC851 IC852 DC motor driver 1 Pin layout 2 Pin function ...

Page 37: ...rminal Output selection control terminal Output selection control terminal Output selection control terminal Output selection control terminal Non connect Non connect Connected to GND upon normal use Multi plexor output terminal Connect to GND I O O O O O No Symbol I O Function 2 Pin Function 1 Block Diagrams BA3835S IC812 SPI B P F 1 2 3 4 5 6 7 8 9 18 17 16 15 14 13 12 11 10 BIAS VREF REFERENCE ...

Page 38: ...FER OPEN DRAIN 12BIT STRAGE RESISTER 12BIT SHIFT RESISTER 1 Terminal Layout 1 2 3 4 5 16 17 18 Vss DATA CLOCK LCK Q0 Q11 OE Vdd I I I O I Connect to GND Serial Data input Shift Clock of Data Latch Clock of Data Parallel Data Output Output Enable Power Supply Pin No Symbol I O Function Latch Data L H OUTPUT ON OFF 2 Pin Function BU2092 F IC811 PORT EXPANDER ...

Page 39: ...FFER AM OSC REG AM RF AFC AM AGC O I O I I I AM Local oscillation Signal output This is a terminal of AM Local oscillation circuit Register value between pin 26 and pin28 desides the frequency width of the input signal AM RF signal input This is an output terminal of voltage for FM AFC This is an AGC voltage input terminal for AM O O I O AM detection output FM detection output Mpx input terminal O...

Page 40: ...utputs ON OFF BTL AMP 1 input pin BTL AMP 1 input pin For gain adjustment BTL AMP 1 input pin Non inverting side BTL AMP 1 input pin Inverting side BTL AMP 2 input pin Inverting side BTL AMP 2 input pin Non inverting side BTL AMP 2 input pin For gain adjustment BTL AMP 2 input pin External transistor collector PNP connection 5V power supply output External transistor PNP base connection Reset outp...

Page 41: ...put output port Input output port Data input output Function IF counter signal input IF signal output Not use AM Local OSC signal output FM Local OSC signal input Power suplly VDD 4 5 5 5V When power ON Reset circuit move PLL charge pump output H Local OSC frequency Height than Reference frequency L Low Agreement Height impedance Input for active lowpassfilter of PLL Output for active lowpassfilte...

Page 42: ...put TUNER data input SLC TUNER clock Not used Power supply 5V Oscillation terminal 8MHz Connect to GND Not used Connect to GND Connect to GND Key matrix input 1 4 SLC Key input 1 SLC Key input 2 Not used SPI Analog data input AD 5V VC3 Ready Maicon reset Bass volume Bass volume Mute muting RDS Data Karaoke SPI A data SPI B data Remote control signal input SLC Photo A SLC Photo B Soundmode reverse ...

Page 43: ...egment control signal output Tuner chip enable System mute Skip LED LED Control signal output CD1 LED Control signal output CD2 LED Control signal output CD3 Reverse skip Music scan input Tuner stereo indicator Backup mode detect Forward skip Rotary encoder VOL Rotary encoder VOL Soundmode foeward B for FL O O O O O O O I I I I I I I I Pin No Symbol I O Function Pin function 2 2 ...

Page 44: ... MCLK MDATA DSL PLL VCO AVDD2 SUB CODE BUFFER SSEL SQCK SUBQ AVDD2 CLVS CRC BLKCK CLDCK SBCK SUBC DEMPH RESY FLAG6 RESY EFM DEMODULATION SUBCODE DEMODULATION SYNC INTERPOLATION 16k SRAM CIRC ERROR CORRECTION DEINTERLEVE LRCKIN MSEL BCLK SSEL SRDATAIN PSEL IOSEL DIGITAL DEEMPHSIS 8TIMES OVER SAMPUNC DIGITAL FILTER 1BIT DAC LOGIC S PEM R PEM L DIGITAL AUDIO INTERFASE DIGITAL AUDIO INTERFASE INTER PO...

Page 45: ...tput Tracking drive output Focus drive output Reference voltage input pin for D A output block TVD FOD FBA TBAL Focus Balance adjust signal output Tracking Balance adjust signal output Focus error signal input Analog input Tracking error signal input Analog input RF envelope signal input Analog input Vibration detect signal input H detect Off track signal input H off track Track cross signal input...

Page 46: ... 46 1 4 R1 TR1 TR3 TR2 TR4 TR5 TR6 TR8 R8 C2 TR14 TR15 TR16 R14 R11 R13 R12 R10 R9 TR9 TR10 TR12 TR13 TR11 TR7 C1 D1 R6 R3 R4 R5 R7 13 11 14 15 9 8 12 5 6 7 10 2 R2 SUB STK402 030 IC301 1 Pin layout 2 Block diagram 1 15 ...

Page 47: ...UME VOLUME TREBLE TREBLE MIDLE MIDLE SPEAKER ATT RIGHT SPEAKER ATT LEFT BASS BASS SUPPLY G G I C BUS DECODER LATCHES 2 0 30dB 2dB STEP INPUT MULTIPLEXER GAIN CSL DIG GND TREBLE R TREBLE L MIN L MOUT L BOUT L BIN L BOUT R BIN R MOUT R MIN R INR MUXOUTR INL SDA CRE Vs AGND ROUT LOUT R IN4 R IN3 R IN2 R IN1 L IN1 L IN2 L IN3 L IN4 MUXOUTL TDA7439 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 30 29 28 27 26 25 ...

Page 48: ...d in Japan 200102 V VICTOR COMPANY OF JAPAN LIMITED AUDIO COMMUNICATION BUSINESS DIVISION PERSONAL MOBILE NETWORK BUSINESS UNIT 10 1 1chome Ohwatari machi Maebashi city 371 8543 Japan No 20912 MX GT80 MX GT90 ...

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