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SERVICE MANUAL
COMPACT COMPONENT SYSTEM
SOUND
VOCAL
MODE
MASKING
ECHO
SLEEP
FM MODE
STILL
V.INTRO
HIGHLIGHT
SUBTITLE
TAPE
A/B
REC
START/STOP
ON SCREEN
PREV
NEXT
KEY CONTROL
SELECT
FADE
MUTING
RM–SMXJ770V REMOTE CONTROL
Each difference point
Model
CD/DECK/RECEIVER
MX-J770V
CA-MXJ770V
MX-J880V
CA-MXJ880V
Contents
Safety precautions
Important for laser products
Preventing static electricity
Precautions at disassembly
and parts replacement
Disassembly method
Adjustment method
MX-J770V
MX-J880V
This illustration is MX-J770V
SPEAKER
Tray fitting
SP-MXJ770V
Silver
SP-MXJ880V
1-2
1-3
1-4
1-5
1-6
1-31
COPYRIGHT
2000 VICTOR COMPANY OF JAPAN, LTD.
US
UX
Color
Panel
Light blue
Silver & blue
Champagne-gold
Diagnosis which uses
extension wire method
Flow of functional operation
until TOC read
Maintenance of laser pickup
Replacement of laser pickup
Description of major ICs
MX-J770V
MX-J880V
Area Suffix
Singapore
Saudi Arabia
COMPACT
SUPER VIDEO
COMPACT
DIGITAL VIDEO
COMPACT
DIGITAL AUDIO
Net
Front
Silver
Champagne-gold
Gray
1-35
1-36
1-37
1-37
1-38
No.20861
Jul. 2000
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Summary of Contents for JVC MX-J770V
- Page 1 TAPE START/STOP SUPER VIDEO ON SCREEN PREV NEXT KEY CONTROL SELECT FADE MUTING COMPACT RM–SMXJ770V REMOTE CONTROL DIGITAL VIDEO This illustration is MX-J770V COMPACT DIGITAL AUDIO Each difference point Color Model CD/DECK/RECEIVER SPEAKER Front Tray fitting Panel MX-J770V CA-MXJ770V SP-MXJ770V Light blue Silver &...
- Page 2 MX-J770V/MX-J880V 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.
- Page 3 MX-J770V/MX-J880V Important for laser products 5.CAUTION : If safety switches malfunction, the laser is able 1.CLASS 1 LASER PRODUCT to function. 2.DANGER : Invisible laser radiation when open and inter 6.CAUTION : Use of controls, adjustments or performance of lock failed or defeated. Avoid direct exposure to beam.
- Page 4 MX-J770V/MX-J880V Preventing static electricity 1. Grounding to prevent damage by static 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.
- Page 5 MX-J770V/MX-J880V 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.
- Page 6 MX-J770V/MX-J880V Disassembly method Metal cover <Main body> Removing the metal cover (See Fig.1 to 3) Remove the six screws A attaching the metal cover on the back of the body. Remove the two screws B attaching the metal cover on both sides of the body.
- Page 7 MX-J770V/MX-J880V CD changer CD changer Removing the CD changer mechanism mechanism assembly mechanism board assembly (See Fig.4 to 6) Front panel assembly Prior to performing the following procedure, remove the metal cover. For the card wire connecting the CD changer...
- Page 8 MX-J770V/MX-J880V Removing the front panel assembly (See Fig.8 to 10) Front panel assembly Prior to performing the following procedure, remove the metal cover and the CD changer mechanism assembly. Remove the four screws L attaching the front panel assembly on the bottom of the body.
- Page 9 MX-J770V/MX-J880V <Front panel assembly> Removing the Microphone terminal board assembly (See Fig.11 and 12) Prior to performing the following procedure, remove the metal cover, CD changer mechanism assembly and the front panel assembly. MIC volume knob Pull out the MIC volume knob from the front side.
- Page 10 MX-J770V/MX-J880V Main board Removing the main board CN867 (See Fig.15 and 16) CN879 Prior to performing the following procedure, remove the front panel assembly, the microphone terminal board and the rolling panel assembly. Disconnect the harness from connector CN867 on the main board.
- Page 11 MX-J770V/MX-J880V Removing the boards in the front panel assembly (See Fig.18 to 20) Prior to performing the following procedure, remove the front panel assembly and the rolling panel assembly. Function Function Function board1 (See Fig.18) board 2 board 1 Remove the two screws S attaching the function board 1.
- Page 12 MX-J770V/MX-J880V Power switch board (See Fig.20) Remote control port board Eject switch Power switch board Remove the two screws W attaching the power board switch board. Unsolder FW951 on the power switch board and disconnect the harness extending to the FW850 bass-level regulator board.
- Page 13 MX-J770V/MX-J880V <Rear panel assembly> Tuner board Joint board Rear panel Removing the tuner board (See Fig.22 and 23) CN871 Plastic rivet Prior to performing the following procedure, remove the metal cover and CD changer mechanism assembly. CN870 Remove the two plastic rivets attaching the joint board, and remove the joint board.
- Page 14 MX-J770V/MX-J880V Removing the rear cover / rear panel Rear panel (See Fig.24 to 27) Prior to performing the following procedure, remove the metal cover and the CD changer mechanism assembly. There is no need to remove the front panel assembly.
- Page 15 MX-J770V/MX-J880V Removing the pre-amplifier board / heat sink (See Fig.28 to 30) Relay board Prior to performing the following procedure, remove CN901 Pre-amplifier board the metal cover, the CD changer mechanism CN713 assembly, the tuner board, input / output board and the rear cover / rear panel.
- Page 16 MX-J770V/MX-J880V Removing the power & main amplifier board (See Fig.31 and 32) Plastic rivet Plastic rivet Prior to performing the following procedure, remove the metal cover, the CD changer mechanism assembly, the rear cover / rear panel, the tuner board, the input / output board and the pre-amplifier board.
- Page 17 MX-J770V/MX-J880V <Rolling panel assembly> Multi-control assembly Removing the multi-control assembly (See Fig.33 to 35) Prior to performing the following procedure, remove the rolling panel assembly and the main board. Remove the two screws L attaching the multi-control assembly on both sides.
- Page 18 MX-J770V/MX-J880V Removing the drive motor assembly Rolling panel assembly CN905 (See Fig.39 to 42) Prior to performing the following procedure, remove the rolling panel assembly and the main board. Remove the relay board and fixing board (Refer to Fig.21). CN900...
- Page 19 MX-J770V/MX-J880V Removing the super VCD control board (See Fig.43) Prior to performing the following procedure, remove the metal cover and the CD changer mechanism CD changer assembly. mechanism assembly Disconnect the card wire from connector CN101 and CN102 CN101 CN102 on the super VCD control board.
- Page 20 MX-J770V/MX-J880V < Speaker section > Removing the speaker cover (See Fig.1) Remove the five screws A attaching the speaker cover on the side of the body. Screw Removing the sub woofer unit (See Fig.2 and 3) Remove the four screws B attaching the sub Screw A woofer unit.
- Page 21 MX-J770V/MX-J880V Screw D Removing the middle range unit (See Fig.9) Middle range unit Remove the ornament panel assembly. Plug wire (White) Plug wire Remove the two screws D attaching the middle (Blue) range unit. Screw D Two plug wires connected with the middle range unit are pulled out.
- Page 22 MX-J770V/MX-J880V 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 two screws A retaining the CD servo control CN854 board. 4.Absorb the four soldered positions "a" of the right and left motors with a soldering absorber.
- Page 23 MX-J770V/MX-J880V Stopper Check whether the lifter unit stopper has been caught into the hole at the section "e" of CD tray assembly as shown in Fig.5. Make sure that the driver unit elevator is positioned as shown in Fig.6 from to the second or fifth hole on the left side face of the CD changer mechanism assembly.
- Page 24 MX-J770V/MX-J880V Cams R1, R2 assembly Removing the CD loading mechanism assembly(See Fig.10) While turning the cams R1 and R2 assembly in the arrow direction "h" ,align the shaft "i" of the CD loading mechanism assembly to the position shown in Fig.10.
- Page 25 MX-J770V/MX-J880V Removing the cam unit (See Fig.14 ~17 ) Remove the CD loading mechanism assembly. While turning the cam gear "q", align the pawl "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).
- Page 26 MX-J770V/MX-J880V Removing the actuator motor and belt Gear bracket (See Fig.18~21) Remove the two screws K retaining the gear bracket (See Fig.19). While pressing the pawl "t" fixing the gear bracket in the arrow direction, remove the gear bracket Pulley gear (See Fig.19).
- Page 27 MX-J770V/MX-J880V Slit washer Removing the cams R1/R2 assembly and cam gear q(See Fig.22) Cam R2 Slit washer Remove the slit washer fixing the cams R1 and R2 assembly. Cam gear L By removing the two pawls "w" fixing the cam R1, separate R2 from R1.
- Page 28 MX-J770V/MX-J880V < Cassette mechanism section > Cassette mechanism Removing the playback,recording and eraser heads (See Fig.1~3) 1. While shifting the trigger arms seen on the right side of the head mount in the arrow direction,turn Flywheel R the flywheel R in counterclockwise direction until the head mount has gone out with a click (See Fig.
- Page 29 MX-J770V/MX-J880V Removing the head amp.and mechanism control P.C.board (See Fig. 4) 1.Remove the cassette mechanism assembly. Head amplifier & 2.After turning over the cassette mechanism mechanism control board assembly,remove the five screws "A" retaining the head amp. and mechanism control P.C.
- Page 30 MX-J770V/MX-J880V Removing the capstan motor (See Fig. 8) Capstan motor From the joint bracket, remove the two screws "C" retaining the capstan motor. Joint bracket Removing the flywheel (See Fig. 9,10) 1.Remove the head amp. and mechanism control P.C.Board. 2.Remove the capstan motor assembly.
- Page 31 MX-J770V/MX-J880V Adjustment method Measurement instruments required for a djustment Radio input signal 1. Low frequency oscillator, AM modulation frequency : 400Hz This oscillator should have a capacity to output 0dBs Modulation factor : 30% to 600ohm at an oscillation frequency of 50Hz-20kHz.
- Page 32 MX-J770V/MX-J880V Arrangement of adjusting positions Cassette mechanism section (Mechanism A section) Cassette mechanism section (Back side) Head azimuth Head azimuth adjusting screw adjusting screw (Reverse side) (Forward side) Head azimuth Head azimuth Playback,recording and eraser adjusting screw adjusting screw Playback...
- Page 33 MX-J770V/MX-J880V Tape recorder section Adjusting Items Measurement Standard Measurement method positions conditions values Confirmation Adjust the head Test tape Maximum 1.Playback the test tape TMT7036(10kHz). of head angle azimuth screw :TMT7036(10kHz) output 2.With the playback mechanism or recording & only when the...
- Page 34 MX-J770V/MX-J880V Electrical performance Adjusting Items Measurement Standard Measurement method positions conditions values Adjustment of AC-225 *Mode : Forward or 1.With the recording and playback mechanism, recording bias :4.20 A reverse mode load the test tapes(AC-514 to TYP and AC-225 to...
- Page 35 MX-J770V/MX-J880V Diagnosis which uses extension wire method System control P.C.board 1.Remove the metal cover and CD changer mechanism. 2.Remove the front panel 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.
- Page 36 MX-J770V/MX-J880V Flow of functional operation until TOC read Check Point Slider turns REST Play Key Power ON Confirm that the voltage at the pin5 SW ON. of CN801 is "H"\"L"\"H". Automatic tuning of TE offset Check that the voltage at the...
- Page 37 MX-J770V/MX-J880V 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.
- Page 38 MX-J770V/MX-J880V Description of major ICs AN8806SB-W(IC601) :RF&SERVO AMP 1.Pin layout PD 1 36 PDAC 35 PDBD LD 2 34 PDF LDON 3 33 PDE LDP 4 VCC 5 32 PDER RF- 6 31 PDFR 30 TBAL RF OUT 7 29 FBAL...
- Page 39 MX-J770V/MX-J880V 3. Pin function Pin No. symbol Function APC amp . Input terminal APC amp . Output terminal LD ON LD ON/OFF control terminal Connect to GND Power supply RF amp . Reversing input terminal RFamp . Output terminal RF OUT...
- Page 40 MX-J770V/MX-J880V AN7345K(IC302) PB/REC AMP 1.Block diagram NF1 OUT1 CTL1 RIN1 RNF1 ROUT1 REPPLE Source CTRL CTRL EQ2 CTL2 OUT2 RIN2 RNF2 ROUT2 2. Pin Function Symbol Function Symbol Function Power supply Playback amplifier input Repple filter Playback amplifier input EQCTL...
- Page 41 MX-J770V/MX-J880V BA15218(IC481,501,502,526,571):OP AMP. OUT1 -IN1 OUT2 +IN1 -IN2 +IN2 BA3126N (IC301) 1. Terminal layout and Block diagram 1-41...
- Page 42 MX-J770V/MX-J880V BA3835S (IC812) : SPI B.P.F. 1.Block Diagrams BIASC BIAS AOUT VREFC VREF REFERENCE RREF TEST CURRENT N.C. N.C. 105Hz PEAK HOLD N.C. N.C. PEAK 340Hz HOLD PEAK 1kHz DIFOUT HOLD PEAK 3.4kHz HOLD PEAK 10.5kHz HOLD 2.Pin Function Symbol Function Decoupling condenser connection terminal.
- Page 43 MX-J770V/MX-J880V BA3837(IC466):MIC Mixer 1.Block diagram ROUT LOGIC LOUT BIAS 2.Pin function Symbol Description Pin No. Power supply Microphone mixing input MIC IN Channel L output LOUT Non connect Non connect Channel L input Signal bias BIAS Connect to GND Channel R input...
- Page 44 MX-J770V/MX-J880V BU1427K (IC152) : Digital RGB-TV Encoder 1. Terminal layout 2. Pin function NAME FUNCTION NAME FUNCTION BOSD OSD BLUE DATA INPUT SLABEB SELECT MASTER/SLAVE Y0/YUV0 YUV DATA ADDH +0.5/-0.5 LINE at NON-INTER Y1/YUV1 YUV DATA VREF-C DAC BIAS Y2/YUV2...
- Page 45 MX-J770V/MX-J880V BU4094BCF(IC303,304,811):Serial to parallel port extension 1.Pin layout 2.Block diagram STROBE DATA OUTPUT ENABLE DATA 8-STAGE CLOCK SERIAL SHIFT REGISTER OUTPUT CLOCK 8-BIT STROBE LATHES 3-STATE OUTPUT OUTPUTS ENABLE PARALLEL OUTPUT 1-45...
- Page 46 MX-J770V/MX-J880V BU9253AS(IC902) : LPF&ECHO MIX. 1.Pin layout & block diagram MUTE ECHO VR BIAS ADINT IN DAINT IN ADINT OUT DAINT OUT ADLPF OUT DALPF IN ADLPF IN DALPF OUT MIX IN MIX OUT 2.Pin function Descriptions Pin No. Symbol...
- Page 47 MX-J770V/MX-J880V HY57V161610DTC8 or KM416S1120DT-G8 (IC504,IC505) : 16MB SDRAM 1.Block diagram Clock Generator Bank B Address Bank A address buffer & Mode Refresh register counter Sense amplifier Column decoder Column & latch circuit address buffer & burst Data counter counter 2.Pin function Pin No.
- Page 48 MX-J770V/MX-J880V LA1838(IC102): FM AM IF AMP&detector, FM MPX Decoder 1. Block Diagram DECODER RF.AMP ANIT-BIRDIE MUTE BUFF STEREO P-DET AM IF PILOT 384KHz COMP S-METER AM/FM S-CLRVE S-METER IF-BUFF TUNING STEREO DRIVE DRIVE FM IF 2. Pin Function Symbol Function...
- Page 49 MX-J770V/MX-J880V LA6541-X(IC801) : Servo Driver 1. Pin Layout & Block Diagram Vref Vin4 Vin3 Level B T L B T L Level RESET shift driver driver shift Level B T L B T L Level Regulator shift driver driver shift...
- Page 50 MX-J770V/MX-J880V LB1641 (IC853) : DC Motor Driver 1. Pin Layout GND OUT1 P1 IN2 VCC1 VCC2 P2 OUT2 2. Pin Functions Input Output Mode OUT1 OUT2 Brake CLOCKWISE COUNTER-CLOCKWISE Brake 1-50...
- Page 51 MX-J770V/MX-J880V LC72136N (IC121) : PLL Frequency Synthesizer 1. Pin layout FM/AM LPFOUT LPFIN CLOCK FM/ST/VCO FMIN AM/FM AMIN IFCONT SDIN IFIN 2. Block diagram Phase Reference Detector Driver Charge Pump Swallow Counter Swallow Counter 1/16,1/17 4bit 1/16,1/17 4bit Unlock Detector...
- Page 52 MX-J770V/MX-J880V MN35511(IC651) : Digital servo & processor 1.Pin layout 2.Block diagram VCOF2 AVDD2 DEMP/TEST2 OUT2D 8tims OUT2C Over VCO2 Sampling Method LRCKI BCKI OUT1D Digital SDATAI Filter OUT1C IOSEL AVSS2 BLKCK CLDCK FLAG SBCK SBCK2 IP FLAG SUBC DEMPO Digital...
- Page 53 MX-J770V/MX-J880V 3. Pin function symbol I/O Description symbol I/O Description BCLK Bit clock output for SRDATA Non connect LRCK Identification signal output of Lch and Rch PLAY Non connect SRDATA WVEL Non connect Serial data output DVDD1 Power supply (Digital)
- Page 54 MX-J770V/MX-J880V MN4SV17160BT-10(IC104):16MB SDRAM 1.Block diagram Column decoder Sense amplifier Bank 0 Memory cell array Column 2048 Row x 256 address Column x 16 bit counter Column address Column decoder buffer Sense amplifier DQ15 Bank 1 Memory cell array address 2048 Row x 256...
- Page 55 MX-J770V/MX-J880V NJM4580E-W(IC652) : OP amp 1. Terminal layout A OUT B OUT 2. Block diagram INPUT OUTPUT 1-55...
- Page 56 MX-J770V/MX-J880V NJM4580L (IC901) : Mic Amplifier 1. A OUTPUT 2. A-INPUT 3. A+INPUT 4. V 5. B+INPUT 6. B-INPUT 7. B OUTPUT 8. V+ TA8409S(IC851,IC852):Motor driver 1.Pin layout 2.Pin function INPUT OUTPUT MODE OUT1 OUT2 MOTOR OUT 2 STOP CW/CCW...
- Page 57 MX-J770V/MX-J880V TDA7439 (IC436) : Conrtol volume 1.Pin layout DIG GND TREBLE(R) AGND TREBLE(L) ROUT MIN(L) LOUT MOUT(L) R-IN4 BOUT(L) R-IN3 BIN(L) R-IN2 BOUT(R) R-IN1 BIN(R) L-IN1 MOUT(R) L-IN2 MIN(R) L-IN3 L-IN4 MUXOUTR MUXOUTL TDA7439 2.Block diagram L-IN1 SPEAKER AGND TREBLE...
- Page 58 MX-J770V/MX-J880V CL8830-PE0 (IC101) : MPEG Decoder & DSP 1. Pin layout 2. Block diagram 1-58...
- Page 59 MX-J770V/MX-J880V 3.Pin function(1/2) Pin No Name Symbol and I/O Description System Services RESET Hardware reset. An external device asserts RESET (active LOW) to execute a decoder hardware reset. To ensure proper initializat- ion after power is stable, assert RESET for at least 20 s.
- Page 60 MX-J770V/MX-J880V 3.Pin function(2/2) Pin No Name Symbol and I/O Description Video Output HSYNC Horizontal sync. The decoder begins outputting pixel data for a new horizontal line after the falling (active) edge of HSYNC. VCLK Video clock. Clocks out data on input. VDATA[7:0]. Clock is ty- pically 27 MHz.
- Page 61 MX-J770V/MX-J880V GP1U281X (IC915) : Receiver for remote controller – Limiter Integrator Comparator Amp. Demodulator B.P.F Vout HD74HCT244FP-XE (IC181) : Buffer 1. Terminal layout 2. Block diagram 1-61...
- Page 62 MX-J770V/MX-J880V MN101CP35DEB (IC810) : System controller Pin function (1/2) Symbol Function Pin No. SVC3 Serial data output KCMND SVC3 status input input MSTAT SVC3 Serial clock input KCLK SLC/TUNER data output DATAOUT TUNER data input DATAIN SLC/TUNER clock Beat cut signal output of TUNER...
- Page 63 MX-J770V/MX-J880V Pin function (2/2) Symbol Function Pin No. FL grid control signal output 51~63 G13~G1 FL segment control signal output 64~87 P1~P24 SLC Chip enable signal output to IC303,IC304 SLCCE LED Control signal output (AUX) AUX LED Rolling panel motor control signal output...
- Page 64 MX-J770V/MX-J880V TC74VHC74FT-X (IC107) : Flip-Flop Pin layout & Block diagram 1CLR 1 2CLR (TOP VIEW) UPD6461GS-635-X (IC151) : 16MB SDRAM 1.Pin layout HSYNC VSYNC DATA CKOUT VBLK OSCOUT OSCIN BLK2 TEST BLK1 2.Pin function Pin No. Symbol Description Pin No.
- Page 65 MX-J770V/MX-J880V MN102L490A (IC103) : VCD Host micom 1.Pin layout 100 ~ 76 26 ~ 50 2.Pin function Pin No. Symbol Description Pin No. Symbol Description DVDWAIT Wait signal input from 55~57 Non connect IC106 ENCRST Reset signal output to IC152...
- Page 67 MX-J770V MX-J880V VICTOR COMPANY OF JAPAN, LIMITED AUDIO & COMMUNICATION BUSINESS DIVISION PERSONAL & MOBILE NETWORK B.U. 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan Printed in Japan (No.20861) 200007(V)