SERVICE MANUAL
Contents
1. R13 TR14 TR15 Krie R14 9 409 E TDA7439 IC436 Control volume 1 Pin layout SDA CRE Vs AGND ROUT LOUT R IN4 R IN3 R IN2 R IN1 L IN1 L IN2 L IN3 L IN4 MUXOUTL 2 Block diagram TDA7439 2 2 L IN1 ne 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 TREBLE L kowe TREBLE SPEAKER ALT LEFT L IN2 L IN3 63 L IN4 0 1 0 3098 2dB STEP lt BUS DECODER LATCHES MX GT80 MXGT90 6 LOUT SCL SDA DIG GND R IN2 9 gt R IN3 8 R IN4 7 INPUT MULTIPLEXER GAIN H 2 2 INR TREBLE R MIN R SPEAKER ATT RIGHT SUPPLY CREF D 1 47 MX GT80 MX GT90 VICTOR COMPANY OF JAPAN LIMITED AUDIO amp COMMUNICATION BUSINESS DIVISION PERSONAL amp MOBILE NETWORK BUSINESS UNIT 10 1 1chome Ohwatari machi Maebashi city 37 1 8543 Japan 62 Printed in Japan No 20912 200102 V2. ges Or Flywheel Flywheel L Fig 10 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 Solenoid MX GT80 MXGT90 Capstan motor Joint bracket Flywheel R Flywheel L t it Les a E Slit washer a Fig 9 i washer b Reel pulse board C d e f g eel pulse boar Solenoid 1 27 MX GT80 MX GT90 Adjustment method Measurement instruments required for adjustment 1 Low frequency oscillator This oscillator should have a capacity to output 0885 to 600 at an oscillation frequency of 50Hz 20kHz 2 Attenuator impedance 600ohm 3 Electronic voltmeter 4 Frequency counter 5 Wow flutter meter 6 Test tape VTT712 For Tape speed and wow flutter SkHz VTT724 For Reference level 1kHz TMT7036 For Head angle 10kHz Play back frequency characteristics 1kHz and dubbing frequency characteristics 63 1 10kHz Because of frequency mixed tape with 63 1k 10k and 14kHz 250nWb m 24dB Use this tape together with a filter 7 Blank tape TAPE I AC 225 8 Torque gauge For play and back tension Forward TW2111A Reverse TW2121A Fast Forward and Rewind
3. TW2231A 9 Test disc CTS 1000 12cm GRG 1211 8cm 10 Jitter meter Measurement conditions Power supply voltage AC120V 60Hz Measurement output terminal Speaker out TP101 Mesuring for TUNER DECK CD Dummy load 6ohm 1 28 Radio input signal AM modulation frequency 400Hz Modulation factor 30 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 side and 0 082 F and 100kohm in series to the sweeper input side 2 The IF sweeper output level should be made as low as possible within the adjustable range 3 Since the IF sweeper is a fixed device there is no need to adjust this sweeper 4 Since a ceramic oscillator is used there is no need to perform any MPX adjustment 5 Since a fixed coil is used there is no need to adjust the FM tracking 6 The input and output earth systems are separated In case of simultaneously measuring the voltage in both of the input and output systems with an electronic voltmeter for two channels therefore the earth should be connected particularly 7 n the case of BTL connection amplifier the
4. CN306 Cassette mechanism assembly Fig 24 Display system control board Stay bracket Fig 25 O CN316 CN880 Display system control board Fig 26 CD play board Fig 27 MX GT80 MX GT90 Removing the preset tuning switch board See Fig 29 and 30 Prior to performing the following procedure remove the display system control board 1 Pull out the preset knob on the front panel 2 Remove the five screws Q attaching the preset tuning switch board 3 If necessary unsolder FW901 on the preset tuning switch board E Removing the operation switch board See Fig 30 and 31 Prior to performing the following procedure remove the display system control board and the preset tuning switch board 1 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 2 Remove the twelve screws R attaching the operation switch board 3 Remove the screw R attaching the earth terminal extending from the switch board 4 Release each tab of the seven joints g retaining the operation switch board Preset tuning switch board Fig 29 Preset knob Surround mode knob Surround woofer level knob Nut Volume knob Fig 30 Joints g R rie Operation Te switch board R R Joint g R JoinsgR HR Fig 31 lt Speaker section 1 gt SP MXGT
5. FBAL 1 TOFS A TES STAT TES FLOCK OUTPUT PORT PLAY LDON WEL SENSE A D INPUT SERVO COVERTER TIMING GENERATOR VV DD T R T V B DS VVRT E E F R D D R F DS DSSE E C E F T DSTS N R T D 11 T V S E 1 44 v 3 Pin function Pin No Dymbol WO BCLK o Not used LRCK o Not used o Not used Power supply Digital Connected to GND o Digital audio interface output MCLK CPU command clock signal input Data is latched at signal s rising point Function M A n CPU command data input mn CPU command load signal input o Sense signal output FLOCK Focus lock signal output Active Low 12 K Lo Tracking lock signal output Active Low 13 K sub code block clock signal output Outside clock for sub code Q resister input Sub code Q code output o Connected to GND Status signal CRC CUE CLVS TTSTOP ECLV SQOK Reset signal input L Reset K Not used K Not used Traverse enforced output Lo Traverse drive output Not used Spindle motor drive signal Enforced m z m 8 9 mode output 3 State 25 Spindle motor drive signal Servo error signal output Kick pulse output 27 Tracking drive output Focus drive output VREF Reference voltage input pin for D A output block TVD FOD FBA TBAL 28 29 m Focus Balance adjust signal output BAL Tracking Balance adjust signal output
6. T 5 IN2 2 Block diagram Vcc e e e R1 Q8 Q5 gt K Q13 Q18 e IN 4 ag i R6 aio OTHER us C2 R5 CH ts 772 i 1 Q16 0k 017 D1 R8 9 Q6 lt 012 a4 Zar NON N R2 IL 014 0114 015 ZR9 VEE OUTPUT 1 35 MX GT80 MX GT90 BA3126N IC301 R P Switch B LB1641 851 1 852 DC motor driver 1 Pin layout GNDOUT1 P1 VZ INI IN2 VCC1VCC2 P2 OUT2 2 Pin function OUT1 OUT2 ___ Clockwise 0 1 COUNTERCLOCKWISE o Bae Eoc D ET o 1 36 BA3835S 1 812 SPI 1 Block Diagrams BIASC 1 BIAS gt gt IL 48 GND VREFC 2 17 AOUT 3 CURRENT H TEST N C 4 19 p 105Hz gt BPF HOLD rz L RER N C 5 perle E N C DIFOUT 6 tiee PES peg 7 ma AIN 8 9 2 Pin Function O VCC i 2 fa 2 GND Function Decoupling condenser connection terminal Decoupling condenser connection terminal Reference resistance connection terminal Non connect Non connect Non connect Connected to GND of audio system through a condenser Inp
7. Tie band Voltage board Regulator board Heat sink Voltage board MX GT80 MXGT90 Amplifier board Tie band CN703 CN704 CN216 CN 15 Fig 19 Amplifier board Heat sink bracket Heat sink bracket Fig 20 MX GT80 MX GT90 HRemoving the power transformer assembly See Fig 21 and 22 Prior to performing the following procedure remove the metal cover the CD changer mechanism assembly and the rear panel 1 Disconnect the wires from connector CN220 and CN250 on the transformer board 2 Disconnect the wire from connector CN204 on the regulator board 3 Remove the four screws k attaching the transformer assembly Removing the regulator board See Fig 23 Prior to performing the following procedure remove metal cover CD changer mechanism assembly rear panel tuner board main board amplifier board voltage board and speaker board 1 Disconnect the wire from connector CN204 on the regulator board 2 Remove the two screws L attaching the regulator board Removing the power cord See Fig 21 lt Prior to performing the following procedure remove the metal cover the CD changer mechanism assembly and the rear panel 1 Disconnect the wire from connector CN250 on the transformer board 2 Remove the tie band from the voltage board 3 Move the power cord stopper upward and pull out it from the base chassis Transformer board CN250 Tie band Vo
8. assembly to the position shown in Fig 10 2 Remove the four screws F retaining the CD loading mechanism assembly Arrow Removing the CD traverse mechanism See Fig 11 and 12 1 For dismounting only the CD traverse mechanism without removing the CD loading mechanism assembly align the shaft j of the CD loading mechanism assembly to the position shown Fig 11 while turning the cam R1 and R2 assembly in the arrow direction 2 By raising the CD loading mechanism assembly in the arrow direction I remove the assembly from the lifter unit F Cam R1 R2 assembly CD loading mechanism assembly Fig 10 CD traverse mechanism Arrow k il Removing the CD pick unit See Fig 13 1 Move the cam gear in the arrow direction m Then the CD pickup unit will be moved in the arrow direction 2 According to the above step shift the CD pickup unit to the center position 3 While pressing the stopper retaining the shaft in the arrow direction o pull out the shaft in the arrow direction p 4 After dismounting the shaft from the CD pickup unit remove the CD pickup unit CD loading mechanism Stopper Stopper Fig 13 1 21 MX GT80 MX GT90 Removing the try select switch board See Fig 14 1 Remove the two screws G retaining the tray select switch board 2 Disconnect the tray select switch board from conn
9. lead of TP1 Play a disc 1 32 MX GT80 MXGT90 Maintenance of laser pickup Replacement of laser pickup 1 Cleaning the pick up lens Before you replace the pick up please try to Turn off the power switch and disconnect the clean the lens with a alcohol soaked cotton power cord from the ac outlet swab 2 Life of the laser diode When the life of the laser diode has expired the following symptoms will appear Replace the pickup with a normal one Refer to Pickup Removal on the previous page 1 The level of RF output EFM output ampli tude of eye pattern will below Plug the power cord in and turn the power on At this time check that the laser emits for about 3seconds and the objective lens moves up and down Note Do not observe the laser beam directly Is the level of RFOUT under 1 25V 0 22Vp p Replace it Play a disc Check the eye pattern at TP1 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 should be performed to match the characteristics of the whole optical block do not touch the semi fixed resistor If the laser power is lower than the specified value the laser diode is almost worn out and the laser pickup should be replaced If the semi fixed resistor is adjusted while the pickup is functioning normally the laser
10. minus terminal of speaker is not for earthing Therefore be sure not to connect any other earth terminal to this terminal This system is of an OTL system E Arrangement of adjusting positions Cassette mechanism section Mechanism A section Head azimuth adjusting screw Forward side Playback head Head azimuth adjusting screw Reverse side Cassette Mechanism Unit Section Front panel assembly MX GT80 MXGT90 Cassette mechanism section Back side Head azimuth adjusting screw Reverse side Head azimuth adjusting screw Forward side Playback recording and eraser heads or playback head Head amplifier amp mechanism control board VR301 Tape speed ADJ VR101 Bias ADJ L VR201 Bias ADJ R 1 29 MX GT80 MX GT90 Tape recorder section Items Measurement Standard Adjusting Confirmation of head angle Confirmation of tape speed Test tape TMT7036 10kHz Measurement output terminal Speaker terminal Speaker R Load 69 Headphone terminal Test tape VTT712 3kHz or TMT7036 3kHz Measurement output terminal Headphone terminal 1 Playback the test tape TMT7036 10kHz 2 With the playback mechanism or recording amp playback mechanism adjust the head azimuth screw so that the forward and reverse output levels become maximum After adjustment lock the head azimuth at least by half a turn 3 In either cas
11. speaker Squawker Removing the speaker woofer See Fig 6 and 7 Prior to performing the following procedures remove the front panel 1 Remove the eight screws D attaching the punch panel on the front of the body 2 Remove the six screws F attaching the speaker woofer on the front of the body 3 Remove the speaker woofer toward the front and disconnect the wire from the two speaker terminals Removing the duct See Fig 8 1 Remove the four screws G attaching the duct on the upper side of the body 2 Move the duct upwards and pull out backward Caution Punch panel When servicing SP MXGT90 speaker system never Fig 6 push or pull the speaker system on the table or floor It will damage the leg cushions attached on the bottom of speaker system Leg cushion is important to prevent vibration and protect speaker system not to slip down from the shelf or table Duct Front panel MX GT80 MXGT90 CD Changer Mechanism Type VC3 Section E Removing the CD Servo control board See Fig 1 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 of the right and left motors with a soldering absorber 5 Pull out the earth wire on the CD changer mechanism assembly 6 Disconnect the connector C
12. supply terminal FM OUT FM detection output FM detect transformer AM DET AM detection output AM SD This is a terminal of AM ceramic filter 25 This is AGC voltage input terminal for AM FM VSM Adjust FM SD sensitivity 26 AFC This is an output terminal of voltage for FM AFC AM VSM Adjust AM SD sensitivity AM RF AM RF signal input MUTE When the signal of IF REQ of IC121 28 REG Register value between pin 26 and pin28 LC72131 appear the signal of FM AM desides the frequency width of the IF output Muting control input input signal 14 FM AM Change over the FM AM input 29 AMOSC This is a terminal of AM Local L AM oscillation circuit 15 MONO ST Stereo Mono L OSC BUFFER AM Local oscillation Signal output 1 39 MX GT80 MX GT90 LA6541 X IC801 Servo driver 1 Pin Layout amp block diagram Vcc Vref Vind Vg4 Vo8 Vo7 Gnd Vo5 Vg3 Vin3 Res 24 23 22 21 20 19 18 17 16 15 14 13 Mr x s SM dive
13. 80 Removing the front panel See Fig 1 1 Remove the four screws A attaching the front panel on the front of the body 2 Pull out the front panel toward the front Removing the speaker tweeter See Fig 2 Prior to performing the following procedures remove the front panel 1 Remove the two screws attaching the speaker tweeter on the front of the body 2 Disconnect the wire from two speaker terminals of the speaker tweeter Removing the speaker squawker See Fig 3 lt Prior to performing the following procedures remove the front panel 1 Remove the four screws C attaching the speaker squawker on the front of the body 2 Disconnect the wire from the two speaker terminals of the speaker Squawker MX GT80 MXGT90 Front panel Fig 3 MX GT80 MX GT90 Removing the speaker woofer See Fig 4 and 5 Prior to performing the following procedures remove the front panel 1 Remove the six screws D attaching the punch panel on the front of the body Attention When reassembling the punch panel need to put glue all around this is important to prevent vibration 2 Remove the four screws E attaching the speaker woofer on the front of the body 3 Pull out the speaker woofer toward the front and disconnect the wire from the two speaker terminals Removing the sub panel See Fig 6 Prior to performing the following procedures remove th
14. Am rique et Canada Caution For continued protection against risk of fire replace only with same type 5A 125V for F001 6A 125V for F101 and F102 This symbol specifies type of fast operating fuse Pr caution Pour eviter risques de feux remplacez le fusible de suret de F001 comme le meme type que 5A 125V et 6A 125V pour F101 et F102 Ce sont des fusibles s retes qui functionnes rapide MX GT80 MX GT90 Disassembly method lt Main body gt Removing the metal cover See Fig 1 to 3 1 Remove the six screws A on the back of the body 2 Remove the two screws on both sides of the body 3 Remove the metal cover from the body by lifting the rear part of the cover CAUTION Do not break the front panel tab fitted to the metal cover 1 6 A Metal cover Fig 1 Metal cover A Fig 2 Metal cover aot Fig 3 BRemoving the CD changer mechanism assembly See Fig 4 and 5 Prior to performing the following procedure remove the metal cover 1 Disconnect the card wire from connector CN661 on the Main board 2 Remove the two screws C on the upper side of the body and the two screws D on the back of the rear panel 3 Remove the plastic rivet attaching the main board 4 Pull both the rear panel and the front panel assembly to the outside then remove the CD changer mechanism assembly by lifting the rear part of the assembly CAUTION To prevent damage to the CD fit
15. Disconnect the card wire from connector CN1 on the antenna board on the right side of the body 2 Remove the plastic rivet fixing the antenna board 3 Remove the two screws F on the back of the body Removing the rear cover rear panel See Fig 12 to 15 Prior to performing the following procedure remove the metal cover and the CD changer mechanism assembly 1 Remove the screw G attaching the rear cover on the back of the body 2 Push each tab of the four joints b in the direction of the arrow and release 3 Remove the eleven screws F attaching the rear panel 4 Release the joints c on each lower side of the rear panel using a screwdriver and remove the rear panel backward Note Remove the tuner board in case of necessity Refer to Fig 21 Joint c Rear panel Fig 15 Rear cover Fig 12 Fig 14 Rear panel MX GT80 MXGT90 Plastic rivet Tuner board Rear panel m Rear panel Joint c MX GT80 MX GT90 Removing the main board See Fig 16 and 17 Prior to performing the following procedure remove the metal cover the CD changer mechanism assembly the rear panel and the tuner board 1 Disconnect the card wires from connector CN870 CN871 and CN315 on the main board 2 Disconnect the flat wires from connector CN704 and CN706 on the amplifier board 3 Remove the screw H attaching the main board on the right side of the body 4 Disconnect co
16. FL segment control signal output ____86 Tuce Tunerchipenabe 87 SMUTE Systemmute 8 SEARCHLE SKpLED O 89 CD1LED LEDCOontolsinalouput CDi LED Control signal output CD2 9 CDS3LED LEDContolsinaloupu CD3 92 RSEARCH I Revmseskp MSI 1 Musicscaninput MPX Tuner stereo indicator INH 1 Backup mode detect S 96 FSEARCH Fomadskp 97 vOL I RotryencoderVOL 98 I Rotary encoder VOL O 99 SOUNDMODE Soundmodefoeward O 100 VPP BforFL 1 43 MX GT80 MX GT90 il MN662748RPM IC651 Digital servo amp digital signal processer 1 Pin layout 2 Block diagram LRCKIN MSEL ee AVS PRATER DIGITAL gt OVER SAMPUNG OUTR PSEL DIGITAL FILTER IOSEL CLVS CRC BLKCK OUTL CLDCK SBCK SUBC DEMPH RESY FLAG6 RESY SSEL IPFLAG SQCK EFM DIGITAL iD DEMODULATION rie A 16k INTERFASE AVDD2 SYNC SRAM INTERPOLATION 7 DIGITAL FEM SUBCODE AUDIO PLLF DEMODULATION INTERFASE DSLF 2622 IREF DRF ERROR ARF CORRECTION INTER POLATION LRCK RSEL DEINTERLEVE SOFT MUTING DIGITA SRDATA PSEL ATTENUATION BCLK PEAK DETECTIVE DMUTE AUTO CUE MCLK MDATA TRKV KICK CK384 EFM UE MICRO VCOF p SEE me SMCK ITUNING D A TE CSEL GENERATION CONVERTER us MSEL PITCH TBAL 2 CONTROL
17. MX GT80 MX GT90 COMPACT COMPONENT SYSTEM MX GT80 MX GT90 CL 4 MER o o o SP MXGT80 CA MXGT80 SP MXGT80 COMPACT DIGITAL AUDIO Each different point Model CD DECK RECEIVER SPEAKER Area Suffix COMPACT Canada uit DIGITAL AUDIO e Pre rhe Buster IMG meen Baehr OUTPUT POWER MAIN SPEAKER SUB WOOFER MX GT80 CA MXGT80 SP MXGT80 55W ch 130W ch MX GT90 CA MXGT90 SP MXGT90 70W ch 160W ch Contents Safety precautions 1 2 Flow of functional operation Important for laser products 1 3 until TOC read 1 32 Preventing static electricity 1 4 Maintenance of laser pickup 1 33 Importance administering Replacement of laser pickup 1 33 point on the safety 1 5 Description of major ICs 1 34 Disassembly method 1 6 Adjustment method 1 28 No 20912 Feb 2001 COPYRIGHT O 2001 VICTOR COMPANY OF JAPAN LTD MX GT80 MX GT90 Safety Precautions 1 This design of this product contains special hardware and many circuits and components specially for safety purposes For continued protection no changes should be made to the original design unless authorized in writing by the manufacturer Replacement parts must be identical t
18. N854 on the CD servo control board 7 Disconnect the card wire CN601 and the connector CN801 on the CD servo control board il Removing the CD tray assembly Remove the front panel assembly See Fig 2 4 Remove the CD changer mechanism assembly Remove the CD Servo control board Remove the screw B retaining the lod stopper From the T bracket section b and clamper base section c remove both of the edges fixing the rod See Fig 2 and 3 9r P Oo wc 6 Remove the screw B retaining the disc stopper See Fig 3 7 Remove the three screws C retaining the T bracket See Fig 3 8 Remove the screw D retaining the clamper assembly See Fig 3 9 From the left side face of the chassis assembly remove the one screw E retaining both of the return spring and lock lever See Fig 4 10 By removing the pawl at the section d fixing the return spring dismount the return spring See Fig 4 11 Remove the three lock levers See Fig 4 T Braket Disc stopper Lod stopper C J version only Lock lever Fig 4 MX GT80 MX GT90 11 Check whether the lifter unit stopper has been caught Stopper into the hole at the section e of CD tray assembly as shown in Fig 5 12 Make sure that the driver unit elevator is positioned as shown
19. RESET shit ave dier Regulator E Uk ohm ohm 1 2 3 4 5 6 7 8 9 10 lu 12 Vcc Mute Vini 01 Voi Vo2 Gnd Vo4 92 Vin2 Reg Reg 2 Pin function E Symbol Function 1 Vcc Power supply Shorted to pin 24 2 Mute All BTL amplifier outputs ON OFF 3 1 1 4 BTL AMP 1 input pin For gain adjustment 5 1 BTL AMP 1 input pin Non inverting side 6 Vo2 BTL AMP 1 input pin Inverting side 7 Vo3 BTL AMP 2 input pin Inverting side 8 Vo4 BTL AMP 2 input pin Non inverting side 9 Vg2 BTL AMP 2 input pin For gain adjustment 10 Vin2 BTL AMP 2 input pin 11 Reg Out External transistor collector PNP connection 5V power supply output 12 Reg External transistor PNP base connection 13 Res Reset output 14 Cd Reset output delay time setting Capacitor connected externally 15 Vin3 BTL AMP 3 input pin 16 Vg3 BTL AMP 3 input pin For gain adjustment 17 Vo5 BTL AMP 3 output pin Non inverting side 18 Vo6 BTL AMP 3 output pin Inverting side 19 Vo7 BTL AMP 4 output pin Inverting side 20 Vo8 BTL AMP 4 output pin Non inverting side 21 Vg4 BTL AMP 4 output pin For gain adjustment 22 Vin4 BTL AMP 4 output pin 23 Vref Level shift circuit s reference voltage application 24 Vcc Power supply Shorted to pin 1 1 40 MX GT80 MXGT90 2136 IC2 PLL frequency synthesizer 1 Pin you 2 22 XT FM AM 21 GND CE 20 LPFOU
20. T DI 19 LPFIN CLOCK 18 PD DO 17 VCC FM ST VCO 16 FMIN AM FM 15 AMIN SDIN 12 IFIN Phase Detector Charge Pump Unlock Detector Programmable DriverS a lt Data Shift Register amp Latch E Universal UE o PRE PER LEA RES 5 No Symbol 1 0 Function Symbol I O Function 1 XT X tal oscillator connect 75 2 12 IF counter signal input 2 FM AM LOW FM mode 13 IFCONT IF signal output 3 CE When data output input for 4pin input and 14 Not use 6pin output H 4 DI Input receive the serial data from 15 AMIN AM Local OSC signal output controller 5 CLOCK Sync signal input use 16 FMIN FM Local OSC signal input 6 DO O Data output for Controller 17 VCC Power suplly VDD 4 5 5 5V Output port When power ON Reset circuit move 7 FM ST VCO Low MW mode 18 PD charge pump output H Local OSC frequency Height than Reference frequency L Low Agreement Height impedance 8 AM FM O Open state after the power on reset 19 LPFIN Input active lowpassfilter of PLL 9 LW Input output port 20 LPFOUT Output for active lowpassfilter of PLL 10 MW Input output port 21 GND Connected to GND 11 SDIN Data input output 22 XT X tal oscillator 75KHz 1 41 MX GT80 MX GT90 BMN101C35DEA1 IC810 System controll
21. ack 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 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 the spring a from behind the playback head 4 Attach the flexible P C board to the chassis base as shown in Fig 3 5 The recording and eraser heads should also be reassembled similarly according to Steps 1 4 above MX GT80 MXGT90 Cassette mechanism Flywheel R Head mount Fig 1 Trigger arm Mechanism A side Playback Recording amp eraser head Spring a Flexible Head amplifier amp mechanism control P C board Fig 2 Flywheel R Mechanism A side Playback head Reversing azimuth Spring a Flexible P C board Head amplifier amp mechanism control P C board FPC holder Fig 3 Mechanism B side 1 25 MX GT80 MX GT90 E Removing the head amp and mechanism control board See Fig 4 1 Remove the cassette mechanism assembly 2 After turning over the cassette mechanism A assembly remove the five screws A retaining the head amplifier amp mechanism control board 3 Disconnect the connectors CN303 on the board and the connectors CN301 and on CN302 both the right and left s
22. ding the frequency counter reading of wow amp flutter should be 0 25 or less WRMS Maximum output Tape speed of decks A and B 3 000 2 60 2 60Hz less with in 0 25 JIS WTD Adjust the head azimuth screw only when the head has been changed mechanism side Both the playback and recording amp playback mechanism Both the playback and recording amp playback mechanism Electrical performance Items Measurement Standard Adjusting Adjustment of recording bias current Reference value Adjustment of recording and playback frequency characteristics Mode Forward or reverse mode Recording mode Test tape AC 225 Measurement output terminal Both recording and headphone terminals Reference frequency 1kHz and 10kHz REF 20dB Test tape 225 Measurement input terminal OSC IN 1 With the recording and playback mechanism load 2 While repetitively inputting the reference frequency MX GT80 MXGT90 1 With the recording and playback mechanism load the test tapes AC 225 to TYP I and set the mechanism to the recording and pausing conditions in advance 2 After connecting 100 9 in series to the recorder head measure the bias current with a valve voltmeter at both of the terminals 3 After resetting the PAUSE mode start recording At this time adjust VR101 for LcH and VR201 for RCH so that the recording bias current valu
23. e front panel 1 Remove the six screws F attaching the sub panel on the back of the front panel 2 Remove the sub panel toward the front Fig 5 Sub panel Front panel Fig 6 Punch panel MX GT80 MXGT90 Speaker section 2 gt SP MXGT90 Removing the front panel See Fig 1 and 2 1 Remove the four screws A attaching the front panel on the front of the body 2 Pull out the front panel toward the front and disconnect the wire from the two speaker terminals of the speaker tweeter on the back of the front panel Removing the speaker tweeter See Fig 3 Prior to performing the following procedures remove the front panel 1 Remove the two screws B attaching the speaker tweeter on the back of the front panel Front panel Removing the sub panel See Fig 4 Prior to performing the following procedures remove e the front panel 1 Remove the six screws C attaching the sub panel on the back of the front panel 2 Pull out the sub panel toward the front Speaker terminals Fig 2 Sub panel Ng Front panel Fig 4 Speaker tweeter Front panel Fig 3 MX GT80 MX GT90 Removing the speaker squawker See Fig 5 Prior to performing the following procedures remove the front panel 1 Remove the four screws E attaching the speaker squawker on the front of the body 2 Disconnect the wire from the two speaker terminals of the
24. e original lead routing and dress should be observed and it should be confirmed that they have been returned to normal after re assembling Leakage 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 directly into the AC outlet Using a Leakage Current Tester measure the leakage current from each exposed metal parts of the cabinet particularly any exposed metal part having a return path to the chassis to a known good earth ground Any leakage current must not exceed 0 5mA AC r m s Alternate check method Plug the AC line cord directly into the AC outlet Use an AC voltmeter having 1 000 ohms per volt or more sensitivity in the following manner Connect a 1 500 10W resistor paralleled by a 0 15uF AC type capacitor between an exposed AC VOLTMETER metal part and a known good earth ground Having 1000 Measure the AC voltage across the resistor with the ohms volts AC voltmeter Move the resistor connection to eachexposed metal part particularly any exposed metal part having a return path to the chassis and meausre the AC voltage across the resistor Now reverse the p
25. e this adjustment should be performed in both the forward and reverse directions with the head azimuth screw lt Constant speed gt Adjust VR301 so that the frequency counter reading becomes 3 000 2 60 2 when playing back the test tape VTT712 3kHz with the playback mechanism or playback and recording mechanism after ending forward winding of the tape Reference values for confirmation items Items Measurement Standard Adjusting 4 800 400 Playback Double tape speed Difference between the forward and reverse speed P mecha and R P mecha speed Wow amp flutter 1 30 Test tape TMT7036 10kHz Measurement output terminal Speaker terminal Speaker R Load resistance 6Q measurement output terminal Headphone terminal Test tape TMT7036 10kHz Measurement output terminal Headphone terminal After setting to the double speed motor confirm that the frequency counter reading becomes 4 800 400 300Hz when the test tape 712 2 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 mechanism at the beginning of forward winding the frequency counter reading of the difference between both of the mechanisms should be 6 0Hz or less When the test tape VTT712 3kHz has been played back with the playback mechanism or recording and playback mechanism at the beginning of forward win
26. ector CN804 on the CD servo control board E Removing the cam unit See Fig 15 17 1 Remove the CD loading mechanism assembly 2 While turning the cam gear align the Paul position of the drive unit to the notch position Fig 16 on the cam gear q 3 Pull out the drive unit and cylinder gear See Fig 17 4 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 5 Remove the four screws H retaining the cam unit cam gear q and cams R1 R2 assembly See Fig 18 Drive unit Cylinder gear 1 22 Tray select switch board 4 G Fig 14 Drive unit Cam gear q ip p C LL Ly Fig 15 H Cams R1 R2 assembly Sas LRRD NS Ls 1 AA L Select lever Fig 17 Removing the actuator motor and belt See Fig 18 21 1 Remove the two screws retaining the gear bracket See Fig 18 2 While pressing the pawl t fixing the gear bracket in the arrow direction remove the gear bracket See Fig 18 3 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 4 Remove the belts respectively from the right and left actuator motor pulleys and pulley gears See Fig 18 5 After turning over
27. er Pin function 1 2 Function 7 9 10 OSC2 1 onnect to GND Ne oser VSS ne mmo T6019 SLCKEY2 5 28 Di ert ES ao a a SPrAnalog C vee Reser Bassvon I Beswhmes O O O BASSVOL Bassvoume AUMUTE Mute muting CRDSDATMKARA RDSDaa Kamde SPA seis Sbe O Remote control signalno E SS PHoro 1 SUG Photo O SOUNDMODE I Scudmodermese __ RDSGlock S pat 1 WwetEb __ O Pwan vorowExr O Voume EXTlIGDaa __ 5 Volume EXTICGLK EXTICGhip select SlGChipenable _ a VcoREsET VOsRee O O FLDisplay gid S S N Oscillati C N C Connect to GND K S 5 5 5 M gt 5 5 CK NC DD NC NC A RT 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 1 42 MX GT80 MXGT90 Pin function 2 2 Pinno Symo vo 0 5 64 5 P22 p1
28. er head on the recording and playback mechanism side and measure the eraser current from both of the eraser terminal 1 81 MX GT80 MX GT90 Flow of functional operation until TOC read Check Point gt EON REST Confirm that the voltage at the pin5 of CN801 is H L H Automatic tuning of TE offset Check that the voltage at the pin40 of IC651 is 5V Detection of disc Automatic tuning of Focus offset Confirm that the Focus error Automatic measurement of Focus S curve amplitude S cuve signal at the pin28 of 651 15 approx 2Vp p Confirm that the signal from Disc is rotated 24 651 is OV asa accelerated pulse during approx 400ms W Tracking error waveform at TOC reading pin 25 of e Focus servo ON 190 Tracking servo ON Automatic measurement of Confirm the waveform of Tracking error amplitude the Tracking error signal at the 25 of IC601 R604 See fig 1 7 A Tracking Tracking Disc to be servo braked to stop on states Disc sates off states SOC A i Automatic tuning of rotate ini Automatic measurement finishes Tracking error balance of TE amplitude and 500mv div automatic tuning of 2ms div Fig 1 TE balance Automatic tuning of Focus error balance Automatic tuning of Focus error gain Automatic tuning of Tracking error gain Confirm the eys pattern TOC treading at the
29. es become 4 0 4A Output deviation between 1kHz and 10kH 1 2 the test tape AC 225 to TYP I and set the mechanism to the recording and pausing condition in advance signal of 1kHz and 10kHz from OSC IN record and playback the test tape 3 While recording and playing back the test tape in I adjust VR101 for LcH and VR201 for RcH so that the output deviation between 1kHz and 10kHz becomes 1dB 2dB Reference values for electrical function confirmation items Items Measurement Standard Adjusting Recording bias frequency Eraser current Reference value Recording and playback side forward or reverse Test tape I AC 225 Measurement terminal BIAS TP on P C board Recording and playback side forward or reverse Recording mode Test tape AC 225 Measurement terminal Both of the eraser head 100kHz 9kHz 7kHz 1 While changing over to and from BIAS 1 and 2 confirm that the frequency is changed 2 With the recording and playback mechanism load the test tape AC 225 to TYP 1 and set the mechanism to the recording and pausing conditions in advance 3 Confirm that the BIAS TP frequency on the P C board is 100kHz 6kHz 1 With the recording and playback mechanism load the test tapes AC 225 to TYP I and set the mechanism to the recording and pausing condition in advance 2 After setting to the recording conditions connect 1MQ in series to the eras
30. ide reel pulse boards 4 When necessary remove the 4pin parallel wire soldered to the main motor Head amplifier amp A mechanism control board Flexible T A Flexible T A Removing the capstan motor assembly board board See Fig 5 to 7 Fig 4 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 Capstan motor B B assembly 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 2 these belts should be hand while referring to the capstan belt hanging method See Fig 6 and 7 O Fig 5 Capstan motor Capstan 1 1 Capstan belt A belt B Capstan Capstan Motor pulley belt A belt B Fig 7 Fig 6 1 26 E Removing the capstan motor See Fig 8 From the joint bracket remove the two screws C retaining the capstan motor Removing the flywheel See Fig 9 10 1 Remove the head amp and mechanism control P C Board 2 Remove the capstan motor assembly 3 After turning over the cassette mechanism remove the two slit washers b fixing the capstan shafts R and L and pull out the flywheels R and L respectively from behind the cassette mechanism
31. in Fig 6 from to the second or fifth hole on the left side face of the CD changer mechanism assembly Caution In case the driver unit elevator is not at above position set the elevator to the position as shown in Fig 7 by manually turning the pulley gear as shown in Fig 8 13 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 14 Pull out all of the three stages of CD tray assembly in the arrow direction f until these stages stop See Fig 6 15 At the position where the CD tray assembly has stopped pull out the CD tray assembly while pressing the two 5 g and g on the back side of CD tray assembly See Fig 9 In this case it is easy to pull out the assembly when it is pulled out first from the stage CD tray assembly Chassis assembly CD tray assembly Pulley gear Motor pulley 0 4 Fig 8 Fig 9 1 20 MX GT80 MXGT90 Removing the CD loading mechanism Cams R1 R2 assembly assembly See Fig 10 1 While turning the cams R1 and R2 assembly in the arrow direction h align the shaft i of the CD loading mechanism
32. linder gear etc with the cam unit cam gear and cans R1 R2 assembly gear unit and drive unit align the position of the pawl x on the drive unit to that of the notch on the cam gear q Then make sure that the gear unit is engaged by turning the cam gear q See Fig 24 1 24 Slit washer d Cam R2 Slit washer Cam gear q Cam switch board C G base assembly Drive unit Gear unit Cylinder gear al E Gear bracket Fig 23 lt Cassette mechanism section gt E Removing the playback recording and eraser heads See Fig 1 3 While shifting the trigger arms seen on the right side of the head mount in the arrow direction turn the flywheel R in counterclockwise direction until the head mount has gone out with a click See Fig 1 2 When the flywheel is rotated in counterclockwise direction the playback recording amp eraser head will be turned in counterclockwise direction from the position in Fig 2 to that in Fig 3 3 At this position disconnect the flexible P C board outgoing from the playback head from the connector CN301 on the head amp and mechanism control board 4 Remove the flexible P C board from the chassis base 5 Remove the spring a from behind the playback recording head 6 Loosen the reversing azimuth screw retaining the playback head 7 Take out the playb
33. ltage board Power cord Base chassis Power cord stopper Power transformer assembly 19 21 Transformer board Regulator board CN204 CN220 E Power transformer assembly Fig 22 Regulator board Fig 23 lt Front panel assembly gt lt Prior to performing the following procedure remove the metal cover the CD changer mechanism assembly and the front panel assembly HRemoving the cassette mechanism assembly See Fig 24 1 Disconnect the card wire from connector CN306 on the head amplifier amp mechanism control board 2 Remove the four screws M and three screws attaching the cassette mechanism assembly HRemoving the display system control board See Fig 25 to 27 1 Remove the five screws N attaching the stay bracket 2 Disconnect the card wires from connector CN316 and CN880 on the display system control board 3 Remove the seven screws O attaching the display system control board 4 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 Removing the CD play board See Fig 27 and 28 1 Remove the three screws attaching the CD eject board 2 If necessary unsolder FW915 on the CD eject board CD playt board P FW915 Soldering Display system control board MX GT80 MXGT90 Head amplifier amp Mechanism control board
34. lug in probe on the AC outlet and repeat each measurement voltage each exposed measured Any must not exceed 0 75 V AC r m s 150092 10W metal part This corresponds to 0 5 mA AC r m s or more sensitivity 0 15uF AC TYPE Place this Good earth ground Warning 1 This equipment has been designed and manufactured to meet international safety standards 2 lt is the legal responsibility of the repairer to ensure that these safety standards are maintained 3 Repairs must be made in accordance with the relevant safety standards 4 t is essential that safety critical components are replaced by approved parts 5 mains voltage selector is provided check setting for local voltage AN 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 1 2 MX GT80 MXGT90 Important for laser products 1 CLASS 1 LASER PRODUCT 5 CAUTION If safety switches malfunction the laser is able 2 DANGER Invisible laser radiation when open and inter to function lock failed or defeated Avoid direct exposure to beam 6 CAUTION Use of controls adjustments or performance of 3 CAUTION There are no serviceable parts inside the procedures other than those specified herein may result in Laser Unit Do not disassemble the Laser Unit Replace hazardous radiation exposure the complete Laser Unit if it malfunctions 4 CAUTION The com
35. mn Focus error signal input Analog input Tracking error signal input Analog input 2 RF envelope signal input Analog input E E E Vibration detect signal input H detect E RN p o lt Off track signal input H off track Track cross signal input RF detect signal input L detect D BDO input pin L detect rc Laser ON signal output H on Bl wo wo w a el MX GT80 MXGT90 Function P Symbol racking error shunt signal output H shunt i ot used 7 z 4 eference current input pin 2013 IREF 1 1 UJ ias pin for DSL DSLF 1 0 Loop filter pin for DSL PLLF Loop filter pin for PLL VCOF AVDD2 AVSS2 Not used 53 POK DSL balance output DSL2 VCOF2 The external circuit is regulated for crystal Power supply Analog Connected to GND Analog Not used 2 2 T o o Connected to GND for X tal oscillation Input of 16 9344MHz X tal oscillation circuit Output of X tal oscillation circuit Power supply for oscillation circuit Not used BYTCK CLDCK FCLK IPPLAG FLAG Not used Not used Power supply Digital Lch audio output Connected to GND ak KL DE 1 45 MX GT80 MX GT90 57 402 030 12301 1 46
36. nnector CN211 and CN212 on the main board from the regulator board m Removing the speaker board See Fig 18 Prior to performing the following procedure remove the metal cover the CD changer mechanism assembly and the rear panel REFERENCE It is not necessary to remove the main board 1 Disconnect connector CN217 on the speaker board from the regulator board Main board CN870 Front panel assembly Amplifier board CN704 CN706 Fig 16 Front panel assembly Plastic rivet Main board Regulator board CN211 Fig 17 Speaker board Regulator board CN217 Fig 18 E Removing the amplifier board voltage board heat sink See Fig 19 and 20 lt Prior to performing the following procedure remove A the metal cover the CD changer mechanism assembly and the rear panel Disconnect the wires from connector CN703 CN704 and CN706 on the amplifier board respectively Remove the two tie band attaching the wire to the amplifier board and the voltage board Disconnect connector CN215 on the amplifier board and CN216 on the 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 attaching the amplifier board to the heat sink Remove the two screws J the board bracket and the voltage board
37. o those used in the original circuits Services should be performed by qualified personnel only N Alterations of the design or circuitry of the product should not be made Any design alterations of the product should not be made Any design alterations or additions will void the manufacturer 5 warranty and will further relieve the manufacture of responsibility for personal injury or property damage resulting therefrom Many electrical and mechanical parts in the products have special safety related characteristics These characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage wattage etc Replacement parts which have these special safety characteristics are identified in the Parts List of Service Manual Electrical components having such features are identified by shading on the schematics and by A on the Parts List in the Service Manual The use of a substitute replacement which does not have the same safety characteristics as the recommended replacement parts shown in the Parts List of Service Manual may create shock fire or other hazards 4 The leads in the products are routed and dressed with ties clamps tubings barriers and the like to be separated from live parts high temperature parts moving parts and or sharp edges for the prevention of electric shock and fire hazard When service is required th
38. pact disc player uses invisible laser radiation and is equipped with safety switches which N CAUTION Please use enough caution not to see the beam directly or touch it prevent emission of radiation when the drawer is open and in case of an adjustment or operation the safety interlocks have failed or are defeated It is check dangerous to defeat the safety switches ADVARSEL Usynlig laserstraling ved bning nar sikkerhedsafbrydere er ude af funktion Undga udseettelse for straling ADVARSEL Usynlig laserstraling ved apning nar sikkerhetsbryteren er avslott unnga utsettelse VARNING Osynlig laserstralning ar denna del ar ppnad och sparren ar urkopplad Betrakta ej stralen VARO Avattaessa ja suojalukitus ohitettaessa olet alttiina n kym tt m lle lasersateilylle Ala katso sateeseen for straling REPRODUCTION AND POSITION OF LABELS WARNING LABEL DANGER Invisibie laser radiation VARO Avattaessa ja suojalukitus VARNING Osynlig laserstralning ADVARSEL Usynlig laserstraling when open and interlock or ohitettaessa olet alttiina denna del ar ppnad och sparren r ved bning nar defeated n kym tt m lle lasers teilylle l urkopplad Betrakta ej str len s sikkerhedsafbrydere er ude af AVOID DIRECT EXPOSURE TO katso s teeseen d funktion Undg udseettelse for BEAM e str ling MX GT80 MX GT90 Preventing static electricity 1 Grounding to prevent damage by sta
39. pickup may be damaged due to excessive current 1 33 MX GT80 MX GT90 Description of major ICs ll AN7345 1C302 PB REC 1 Block diagram EQ L1 L2 1 OUT1 EQ1 CTL1 RINI RNF1 ROUT1 CTL RF VCC R1 R2 NF2 OUT2 EQ2 CTL2 RIN2 RNF2 ROUT2 LC LPF GND 2 Pin Function Pin Pin Symbol I O Function No Symbol I O Function Playback amplifier input RU Ripple filter i OUT2 A Playback amplifier output ROUT1 Recording amplifier output 17 RNF1 Recording amplifier negative feedback Recording amplifier negative feedback amplifier negative feedback se Pre LEN input switching time Z RIN1 Recording amplifier input constant id il Recording amplifier input CTL1 Pre amplifier input switching control amplifier negative Recording amplifier negative feedback Equalizer 0 Recording amplifier output amplifier output our 0 Playback amplifier output amplifier output Ele CHR ALC low cut p Playback amplifier negative feedback Ed ALC low pass filter Playback amplifier input 24 featur iu Playback amplifier input 1 34 MX GT80 MXGT90 15218 IC652 BA15218N 1C481 501 502 526 546 571 Dual op amp 1 Pin layout 1 8 2 H gt 7 our Ll 1 N1 3 HC 6 IN2 2 4
40. se 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 the traverse unit Be careful not to take too long a time when attaching it to the connector 3 Handle the flexible cable carefully as it may break when subjected to strong force 4 It is not possible to adjust the semi fixed resistor that adjusts the laser power Do not turn it Attention when traverse unit is decomposed CD changer Please refer to Disassembly method in the text for pick up and howto detach the CD traverse mechanism 1 Remove the disk stopper and T bracket on the CD changer mechanism WA d assembly CD traverse 2 Disconnect the harness from connector on the CD motor board unit 3 CD traverse unit is put up as shown in Fig 1 4 Solder is put up before the card wire is removed from connector CN601 Fig 1 on the CD servo control board as shown in Fig 2 When the wire is removed without putting up solder the CD pick up assembly might destroy 5 Please remove solder after connecting the card wire with CN601 when you install picking up in the substrate Soldering Flexible cable Fig 2 1 4 MX GT80 MXGT90 Importance administering point on the safety For USA and Canada pour Etats Unis d
41. the chassis assembly remove the actuator motor while spreading the four pawls v fixing the right and left actuator motors in the arrow direction See Fig 20 Note When the chassis assembly is turned over under the conditions wherein the gear bracket and belt have been removed then the pulley gear as well as the gear etc constituting the gear unit can possibly be separated to pieces In such a case assemble these parts by referring to the assembly and configuration diagram in Fig 21 Gear bracket Select gear MX GT80 MXGT90 Gear bracket Pulley gear Belt Motor pulley Pulley gear Belt Motor pulley Fig 18 Actuator motor of NC n 0 0 O 7 V mum da di ri 2 Fig 20 Pulley gear Cylinder gear Gross gear U Gross gear L Gear C Fig 21 1 23 MX GT80 MX GT90 Removing the cams R1 R2 assembly and cam gear q See Fig 22 1 Remove the slit washer fixing the cams R1 and R2 assembly 2 By removing the two pawls fixing the cam R1 separate R2 from R1 3 Remove the slit washer fixing the cam gear q 4 Pull out the cam gear q from the C G base assembly E Removing the base assembly See Fig 22 and 23 Remove the three screws J retaining the C G base assembly Caution To reassemble the cy
42. tic electricity Electrostatic discharge ESD which occurs when static electricity stored in the body fabric etc is discharged can destroy the laser diode in the traverse unit optical pickup Take care to prevent this when performing repairs 2 About the earth processing for the destruction prevention by static electricity In the equipment which uses optical pick up laser diode optical pick up is destroyed by the static electricity of the work environment Be careful to use proper grounding in the area where repairs are being performed 2 1 Ground the workbench Ground the workbench by laying conductive material such as a conductive sheet or an iron plate over it before placing the traverse unit optical pickup on it 2 2 Ground yourself Use an anti static wrist strap to release any static electricity built up in your body caption Anti static wrist strap 1MQ Conductive material conductive sheet or iron plate 3 Handling the optical pickup 1 In order to maintain quality during transport and before installation both sides of the laser diode on the replacement optical pickup are shorted After replacement return the shorted parts to their original condition Refer to the text 2 Do not use a tester to check the condition of the laser diode in the optical pickup The tester s internal power source can easily destroy the laser diode 4 Handling the traverse unit optical pickup 1 Do not subject the traver
43. ting be sure to pull both the rear panel and the front panel assembly enough to remove the CD changer mechanism assembly Removing the front panel assembly See Fig 6 to 10 Prior to performing the following procedure remove the metal cover and CD changer mechanism assembly 1 Disconnect the card wires from connector CN870 CN871 and CN315 on the main board respectively 2 Remove the tie band and disconnect the wire from connector CN703 on the amplifier board 3 Disconnect the wire from connector CN220 on the transformer board MX GT80 MXGT90 Front panel assembly CD changer Main board mechanism assembly CN661 Fig 4 Rear panel Front panel assembly Fig 5 Amplifier board Wire clamp CN703 CN870 Front panel assembly Transformer board CN220 Front panel assembly Main board Fig 7 MX GT80 MX GT90 4 Remove the four screws the bottom of the E Front panel assembly body 5 Release the two joints a on the lower right and left sides of the body using a screwdriver and remove A 1 the front panel assembly toward the front m fe ngi Fig 8 Front panel assembly Joint a Fig 9 Joint a Front panel assembly Fig 10 1 8 Removing the tuner board See Fig 11 and 12 Prior to performing the following procedure remove the metal cover and the CD changer mechanism assembly 1
44. uts the audio signal through a condenser Power supply terminal 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 MX GT80 MXGT90 1 37 MX GT80 MX GT90 1 2092 811 EXPANDER 1 Terminal Layout 12BIT STRAGE RESISTER 12BIT SHIFT RESISTER 2 Pin Function coment DATA om i sei CLOCK EY Shift Clock of Data 1 vai lao at 5 16 00 011 Parallel Data Output Vdd Power Supply 1 38 MX GT80 MXGT90 B LA1838 IC1 FM AM IF AMP amp detector MPX decoder 1 Block Diagram x FF 19kLS DET 2 Pin Function i No SITES Symbol FM IN This is an input terminal of FM IF 16 L OUT Left channel signal output signal AM MIX This is an out put terminal for AM 17 R OUT Right channel signal output mixer FM IF Bypass of FM IF 1 L IN Input terminal of the left channel post AMP A Input of AM IF Signal 1 RIN Input terminal of the right channel post AMP LO I 5 Mpx Right channel signal output This is the device ground terminal TUNED When the set is tuning this terminal becomes L Mpx Left channel signal output N 21 STEREO Stereo indicator output Stereo L IF IN Mpx input terminal Mono H ND This is the power
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