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JVC MX-J770V, Service Manual

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JVC MX-J770V Service Manual Download Page 5

MX-J770V/MX-J880V

1-5

Precautions at disassembling and parts replacement

This model is charged with electricity on the power board
even if the power cord is unplugged. 
Therefore, always discharge electricity in accordance with
the steps given below before starting disassembling of the 
unit and/or replacement of parts.

1.

2.

While referring to the disassembling steps, remove the 
metal cover and the CD changer mechanism.

Set electrical resistances of 1kohm, 1/4W to the places between
the + and - terminals of condensers VH(C204, C205) and VL(C214, C215) 
on the power board, and discharge electricity for 4 ~ 5 seconds.
Connection should be made at first for VH. 

Power board

C205

C214

C204

C215

Summary of Contents for MX-J770V

Page 1: ...er pickup Replacement of laser pickup Description of major ICs 1 35 1 36 1 37 1 37 1 38 Contents Area Suffix US UX Singapore Saudi Arabia Each difference point Model CD DECK RECEIVER SPEAKER MX J880V CA MXJ880V MX J770V CA MXJ770V SP MXJ770V SP MXJ880V Color Tray fitting Silver Light blue Gray Silver blue Silver Champagne gold Champagne gold Panel Net Front TAPE A B FADE MUTING RM SMXJ770V REMOTE ...

Page 2: ...age current 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 d...

Page 3: ...rstrålning 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 utsettelse for...

Page 4: ...r 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: ...ven below before starting disassembling of the unit and or replacement of parts 1 2 While referring to the disassembling steps remove the metal cover and the CD changer mechanism Set electrical resistances of 1kohm 1 4W to the places between the and terminals of condensers VH C204 C205 and VL C214 C215 on the power board and discharge electricity for 4 5 seconds Connection should be made at first ...

Page 6: ...ing the metal cover on both 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 ATTENTION Fig 1 Fig 2 Fig 3 Metal cover A A A Metal cover B Metal cover B ...

Page 7: ...ideo out terminal by lifting the rear part of the CD changer mechanism assembly 1 2 3 4 5 6 Removing the CD changer mechanism assembly See Fig 4 to 6 Prior to performing the following procedure remove the CD changer mechanism assembly Reverse the CD changer mechanism assembly Remove the two screws J attaching the bracket Remove the screw K attaching the video CD board Disconnect the card wire from...

Page 8: ...ector CN901 on the relay board on the back of the front panel assembly Disconnect the harness from connector CN912 on the input output board Disconnect connector CN870 and CN871 on the input output board from the main board Release the two joints c and d on the lower part of the sides using a screwdriver and remove the front panel assembly toward the front 1 2 3 4 5 6 7 Removing the front panel as...

Page 9: ...in board get them through the slots under the rolling panel when reattaching the rolling panel assembly to the front panel Refer to Fig 14 ATTENTION Prior to performing the following procedure remove the metal cover CD changer mechanism assembly and the front panel assembly Pull out the MIC volume knob from the front side Remove the two screws M attaching the microphone terminal board assembly Rem...

Page 10: ...f CN879 as shown in Fig 16 Remove the two screws P attaching the main board 1 2 3 Removing the main board See Fig 15 and 16 Prior to performing the following procedure remove the front panel assembly Disconnect the card wire from connector CN306 on the cassette mechanism board Remove the four screws Q and three screws R attaching the cassette mechanism assembly 1 2 Removing the cassette mechanism ...

Page 11: ...ch Main volume headphone board See Fig 19 Pull out the volume knob on the front side of the front panel assembly and remove the nut attaching the main volume headphone board Remove the two screws U attaching the main volume headphone board on the back of the front panel assembly and release the two joints g Unsolder FW850 on the main volume headphone board and disconnect the harness connected to t...

Page 12: ...D changer mechanism assembly There is no need to remove the front panel assembly Disconnect the harness from connector CN900 and CN901 on the relay board on the back of the rolling panel assembly Disconnect the card wire from connector CN905 and CN906 on the relay board on the back of the rolling panel assembly Remove the screw Z attaching the relay board Remove the relay board from the groove i R...

Page 13: ... board Remove the screw C attaching the input output board on the lower side of the body Remove the five screws E F H attaching the AUX main speakers sub woofers terminal board on the back of the body Remove the screw G attaching the CD optical digital output back of the body Disconnect the harness from connector CN912 on the input output board and pull out the earth wire on the main board Disconn...

Page 14: ...ve screws Z attaching the heat sink and the pre amplifier board to the rear panel on the back of the body Remove the two screws Y attaching the voltage selector to the rear panel on the back of the body Remove the screw X attaching the rear panel to the chassis base on the back of the body Remove the two screws B attaching the tuner board on the back of the body Release the two joints k and l on t...

Page 15: ...e harness from connector CN713 on the pre amplifier board Remove the two screws H attaching the heat sink to the power main amplifier board on the back of the body Remove the fore screws I J attaching the pre amplifier board and IC to the heat sink Remove the bracket then detach the pre amplifier board from the heat sink 1 2 3 4 5 Removing the pre amplifier board heat sink See Fig 28 to 30 Fig 28 ...

Page 16: ...in amplifier board through the upper side slots Remove the two plastic rivets fixing the power main amplifier board Remove the cord stopper by pushing it upward Cut off the bands m and n fixing the power cord and unsolder the power cord on the power main amplifier board 1 2 3 4 Removing the power main amplifier board See Fig 31 and 32 Fig 31 Fig 32 K Power main amplifier board K K Plastic rivet Pl...

Page 17: ...o performing the following procedure remove the rolling panel assembly the main board and the multi control assembly Remove the four screws M attaching the cover and the bracket Pull out the right and left panel holders outward respectively by releasing the tabs o outward Remove the cover and the bracket Remove the two screws N attaching the multi control board 1 2 3 4 Removing the multi control b...

Page 18: ...e the motor belt Remove the three screws Q attaching the side bracket Remove the shaft assembly from the rolling panel assembly by lift up the shaft assembly upward Remove the drive motor upward 1 2 3 4 5 6 7 Removing the drive motor assembly See Fig 39 to 42 Fig 21 Fig 39 Fig 40 Fig 41 Rolling panel assembly Z A Groove i CN900 CN901 Relay board Groove j Fixing board Z Relay board A Fixing board P...

Page 19: ...m assembly Disconnect the card wire from connector CN101 and CN102 on the super VCD control board Remove the two plastic rivets attaching the super VCD control board 1 2 Removing the super VCD control board See Fig 43 Fig 43 CD changer mechanism assembly Super VCD control board Plastic rivet Plastic rivet CN101 CN102 ...

Page 20: ...moving the sub woofer unit See Fig 2 and 3 Removing the speaker cover See Fig 1 Fig 2 Fig 3 Remove the saran board from the speaker box Saran board can be detached by pulling the side of Saran board forward The plus driver is inserted in the holder it is lifted and the holder is removed Four holders are removed and four screws C under that are removed The minus driver is inserted in the concave pa...

Page 21: ...fer unit Remove the ornament panel assembly Remove the two screws D attaching the middle range unit Two plug wires connected with the middle range unit are pulled out 1 2 3 Removing the middle range unit See Fig 9 Remove the ornament panel assembly Remove the four screws E attaching the woofer unit Two plug wires connected with the woofer unit are pulled out 1 2 3 Removing the woofer unit See Fig ...

Page 22: ...t 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 two screws A retaining the CD servo control board 4 Absorb the four soldered positions a of the right and left motors wit...

Page 23: ... Fig 8 13 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...

Page 24: ... direction 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 st...

Page 25: ... unit and cylinder gear See Fig 17 While turning the cam gear q align the pawl s position of the select lever to the notch position Fig 18 on the cam gear q Remove the four screws J retaining the cam unit cam gear q and cams R1 R2 assembly See Fig 18 Fig 15 Fig 14 Fig 16 Cam gear q Drive unit r I J J J Chassis assembly Tray select switch board CN802 CN801 CN804 Cylinder gear Drive unit Fig 17 Sele...

Page 26: ...racket in the arrow direction remove the gear bracket See Fig 19 From the notch u section on the chassis assembly fixing the edge of gear bracket remove and take out the gear bracket See Fig 20 Remove the belts respectively from the right and left actuator motor pulleys and pulley gears See Fig 19 After turning over the chassis assembly remove the actuator motor while spreading the four pawls v fi...

Page 27: ...nd 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 L retaining the C G base assembly Fig 23 Slit washer Pawl Cam R2 Slit wash...

Page 28: ...ng azimuth screw retaining the playback head 8 Take out the playback head from the front of the head mount 9 The recording and eraser heads should also be removed similarly according to Steps 1 8 above Reassembling the playback recording and eraser heads See Fig 2 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...

Page 29: ...ving the capstan motor assembly 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 t...

Page 30: ... 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 P C 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 ...

Page 31: ...Modulation factor 30 FM modulation frequency 400Hz Frequency displacement 22 5kHz Frequency Range AM 531kHz 1602kHz FM 87 5MHz 108MHz Standard measurement positions of volume and switch Power Standby Light STANDBY Indicator S A BASS OFF Sound mode OFF Main VOL 0 Minimum Travers mecha set position Disc 1 Mic MIX vol MAX ECHO OFF Precautions for measurement 1 Apply 30pF and 33kohm to the IF sweeper ...

Page 32: ...m 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 33: ...pe 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 mecha...

Page 34: ...rminal Both recording and headphone terminals Reference frequency 1kHz and 10kHz REF 20dB Test tape TYP AC 514 Measurement input terminal OSC IN AC 225 4 20 A AC 514 4 0 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 ...

Page 35: ...nel assembly 3 One screw A is removed and relay board is removed 4 As shown in fig 1 place the front panel assembly after opening it outward using the right side of the front panel as an axis 5 The extension wire is connected with CN870 CN871 on the INPUT OUTPUT board and CN860 CN861 on the main board Extension wire parts No Extension wire Input output board Main board Relay board Relay board CN87...

Page 36: ...ishes 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 ...

Page 37: ... 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 sho...

Page 38: ... BDO 13 BDO 14 CS BRT 15 OFTR 16 NRFDET 17 GND 18 36 PDAC 35 PDBD 34 PDF 33 PDE 32 PDER 31 PDFR 30 TBAL 29 FBAL 28 EF 27 EF OUT 26 TE 25 TE OUT 24 CROSS 23 TE BPF 22 VDET 21 LD OFF 20 VREF 19 ENV 30 24 25 26 23 22 1 4 3 33 32 34 31 36 35 13 14 15 16 20 2 21 6 29 7 28 27 8 9 10 17 11 12 19 ENV CURCUIT RF DET AGC EQ BDO OFTR VCBA VCBA VCBA VCBA Description of major ICs ...

Page 39: ...connection terminal ARF output terminal RF detection capacity connection terminal HPF amp capacity connection terminal Capacity connection terminal for RF discernment side envelope detection BDO output terminal Capacity connection terminal for RF discernment side envelope detection OFTR output terminal RFDET output terminal Connect to GND 3TENV output terminal VREF output terminal APC OFF control ...

Page 40: ...k diagram Playback amplifier input R1 R2 I Playback amplifier input NF2 Playback amplifier negative feedback OUT2 Playback amplifier output EQ2 I Equlaizer CTL2 I Pre Amplifier input swithing 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 Repple f...

Page 41: ...80V 1 41 1 OUT1 2 IN1 3 IN1 4 8 7 6 5 VEE VCC OUT2 IN2 IN2 2 1 BA15218 IC481 501 502 526 571 OP AMP 7 6 5 4 3 2 1 REC SW GND P B SW CONT GND VCC P B SW BA3126N IC301 1 Terminal layout and Block diagram 8 9 GND REC SW ...

Page 42: ...erminal 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 43: ...OUT FK TK LIN BIAS GND RIN LPF1 LPF2 LPF3 ROUT CONTA CONTB CONTC Power supply Microphone mixing input Channel L output Non connect Non connect Channel L input Signal bias Connect to GND Channel R input Connects to LPF time constant element Connects to LPF time constant element LPF outpout Channel R output Mode select input A Mode select input B Mode select input C I O I I I O O O O I I I Pin No Sy...

Page 44: ... DATA UV DATA UV DATA UV DATA DIGITAL GROND SELECT NISC PAL MODE SELECT YUV YUV SELECT DAC NORMAL Normally pull down to GND SELECT U V TIMING V SYNC INPUT or OUTPUT H SYNC INPUT or OUTPUT 1 2 freq of BCLK DIGITAL VDD VDD for I O Interlace Non Interlace SELECT MASTER SLAVE 0 5 0 5 LINE at NON INTER DAC BIAS CHROMA OUTPUT GROUND CHROMA OUTPUT Composite Output Ground COMPOSITE OUTPUT Analog Ground DA...

Page 45: ...6 Q7 Q8 Q s Qs 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 1 Pin layout 8 STAGE SHIFT REGISTER 8 BIT LATHES 3 STATE OUTPUTS 1 2 3 15 Q1 Q8 10 9 DATA CLOCK STROBE OUTPUT ENABLE PARALLEL OUTPUT Q s Qs SERIAL OUTPUT 2 Block diagram BU4094BCF IC303 304 811 Serial to parallel port extension ...

Page 46: ...T ADINT OUT ADINT IN VCC NC2 MUTE CR Connect GND Echo level control Non connect Analog part DC bias DA side integrator input DA side integrator output DA side LPF input DAside LPF output Mix AMP output for original tone echo tone Mix AMP input pin for original tone AD side LPF input AD side LPF output AD side integrator output AD side integrator input Power supply Non connect Mute control signal i...

Page 47: ...KE CLK UDQM NC VCC DQ8 9 VSS DQ10 11 VDD DQ12 13 VSS DQ14 15 VSS Power supply Data input output Connect to GND Data input output Power supply Data input output Connect to GND Data input output Power supply Lower DQ mask enable Write enable Column address strobe Row address strobe Chip enable Address inputs Address inputs Power supply Connect to GND Address inputs Non connect Clock enable System cl...

Page 48: ...UFFER 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 besides 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 ...

Page 49: ... outputs 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 ou...

Page 50: ... 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 IC853 DC Motor Driver 1 Pin Layout 2 Pin Functions ...

Page 51: ...nput 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 lowpassfilt...

Page 52: ... Subcode buffer DSL PLL VCO Digital deemphasis 8tims Over Sampling Digital Filter PLL VCO2 DD Method DAC PEM R PEM L AVDD2 OUT2D OUT2C OUT1D OUT1C AVSS2 FLAG IP FLAG TX ECM PC LRCK SRDATA BCLK DMUTE VREF TRV KICK PLAY TRVSTP ECS TVD TRD FOD TBAL FBAL TLOCK FLOCK LDON TOFS WVEL SENSE VDD VSS DVDD1 DVSS1 RST TEST FE TE RFENV TRCRS VDET BDO RFDET OFT STAT X1 X2 XSEL SMCK FCLK VCFO CK384 MDATA MCLK ML...

Page 53: ...nal 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 RF detect signal input L detect BDO input pin L detect Laser ON signal output H on I I I I O I O I I I I I I Description Non connect Non connect TES PLAY WVEL ARF IREF DRF D...

Page 54: ...to GND Address inputs Non connect Clock enable System clock input Upper DQ mask enable Non connect Power supply Data input output Connect to GND Data input output Power supply Data input output Connect to GND Data input output Connect to GND Pin No Symbol Description Pin No Symbol Description 2 Pin function MN4SV17160BT 10 IC104 16MB SDRAM Clock buffer Command decoder Address buffer Control signal...

Page 55: ...MX J770V MX J880V 1 55 V INPUT OUTPUT V NJM4580E W IC652 OP amp 1 Terminal layout 2 Block diagram 1 2 3 4 8 7 6 5 A OUT A IN A IN V V B OUT B IN B IN A B ...

Page 56: ... 9 TA8409S IN2 VCC OUT 2 GND GND VS OUT 1 VR IN1 IN1 0 1 0 1 IN2 0 0 1 1 OUT1 H L L OUT2 L H L MOTOR STOP CW CCW CCW CW BRAKE INPUT OUTPUT MODE TA8409S IC851 IC852 Motor driver 1 Pin layout 2 Pin function 14 13 12 11 10 9 8 7 6 5 4 3 2 1 1A 1B 1Y 2A 2B 2Y GND Vcc 4B 4A 4Y 3B 3A 3Y TC74VHC00FT X IC106 Wright timing control 1 Terminal layout Block diagram ...

Page 57: ...LUME 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 58: ...MX J770V MX J880V 1 58 CL8830 PE0 IC101 MPEG Decoder DSP 1 Pin layout 2 Block diagram 1 52 156 105 208 157 53 104 ...

Page 59: ... address bus 3 bit address bus selects one of eight host interf ace registers 8 bit bi directional host data bus Host writes data to the decoder Code FIFO via HDATA 7 0 MSB of the 32 bit word is written first The host also reads and writes the decoder internal registers and local SDRAM ROM via HDAT 7 0 Host interrupt Open drain signal must be pulled up to 3 3 volts Driven high for 10 ns before tri...

Page 60: ...trobe Active LOW EDO DRAM Row address strobe SDRAM LDQM Memory address Memory data SDRAM EDO write enable Decoder asserts active LOW to request a write operation to the SDRAM array ROM chip select Open drain signal must be pulled up to 3 3 volts Active LOW SDRAM column address SDRAM system clock Active LOW SDRAM bank select Active LOW SDRAM row address SDRAM UDQM Audio interface 167 161 166 169 17...

Page 61: ...X J770V MX J880V 1 61 GP1U281X IC915 Receiver for remote controller GND B P F VCC Vout Amp Limiter Integrator Comparator Demodulator HD74HCT244FP XE IC181 Buffer 1 Terminal layout 2 Block diagram VSS VDD ...

Page 62: ...layback recording detect switch Tape B playback detect switch Tape A playback detect switch SPI IN VC3 Ready Reset signal input Rolling panel open detection signal input Rolling panel close detection signal input LED Control signal output VOL MS detector signal input Echo ON OFF Not used Echo ON OFF Not used Remote control signal input Tape A mechanism running detection signal input Tape B mechani...

Page 63: ...ip enable signal output to IC303 IC304 LED Control signal output AUX Rolling panel motor control signal output Rolling panel motor control signal output LED Control signal output CD LED Control signal output TAPE LED Control signal output TUNER System mute control signal output Tuner supply control Power ON OFF TUNER Chip enable signal output VC3 reset output Power supply O O O O O O O O O O O O O...

Page 64: ...put Power ON clear Power supply Non connect Non connect Oscillation terminal output Connect to GND Connect to GND Non connect Non connect Non connect Non connect Blanking signal output Character signal output Character signal output Character signal output Vertical synchronizing signal input Horizontal synchronizing signal input Pin No Symbol Description Pin No Symbol Description 2 Pin function UP...

Page 65: ...t to ground Connect to ground Non connect Power supply Oscillation terminal 1MHz Oscillation terminal 1MHz Connect to ground Host address bus terminal Power supply Host address bus terminal Non connect Connect to ground Non connect Non connect Power supply Non connect Reset signal output to IC152 Normal PAL60 at PAL mode Select NTSC PAL mode Connect to ground Non connect Non connect Request signal...

Page 66: ......

Page 67: ...inted in Japan 200007 V VICTOR COMPANY OF JAPAN LIMITED AUDIO COMMUNICATION BUSINESS DIVISION PERSONAL MOBILE NETWORK B U 10 1 1chome Ohwatari machi Maebashi city 371 8543 Japan No 20861 MX J770V MX J880V ...

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