JVC MX-GA8, Service Manual

Page 1: ... 1 20 5 TROUBLESHOOTING 1 24 SP MXGA8 SP MXGA8 CA MXGA8 CD 1 DISC CHANGE DISPLAY CD 2 CD 3 TUNING STANDBY RANDOM PROGRAM DUBBING REC START STOP CD REC START SET CLOCK TIMER CANCEL DEMO SOUND TURBO TAPE A B REPEAT PHONES TUNING C O M P A C T C O M P O N E N T S Y S T E M M X G A 8 R O C K P O P CLASSIC D A N C E H A L L STADIUM SOUND MODE VOLUME EJECT EJECT SUBWOOFER LEVEL PRESET STANDBY ON BEEP Ar...

Page 2: ... 710 kHz CD player CD Capacity 3 CDs Dynamic range 85 dB Signal to noise ratio 85 dB Cassette deck Frequency response Normal type I 50 Hz 14 000 Hz Wow and flutter 0 15 WRMS General Power requirement AC 120 V 60 Hz Power consumption 160 W at operation 18 W on standby Dimensions approx 270 mm 317 mm 453 mm W H D Mass approx 8 8 kg Speaker section Type 3 way bass reflex type Speaker units Subwoofer ...

Page 3: ...ack 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 particular ly any exposed metal part having a return path to the chassis to a known good...

Page 4: ...tester s internal power source can easily destroy the laser diode 1 6 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 s...

Page 5: ... No MB080 1 5 SECTION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS ...

Page 6: ... How to eject the CD tray manually see fig 2 Turn the loading pulley gear at the bottom of the CD changer unit as shown in Fig 2 and draw the CD tray toward the front Fig 1 Fig 2 3 1 2 Removing the CD tray fitting See Fig 3 Prior to performing the following procedure eject the CD tray 1 After drawing the lower part of the tray fitting toward the front remove the five claws Then while moving the tr...

Page 7: ...nect the harness from the connector CW104 on the main board 4 Remove the two screws C attaching the CD changer unit to the rear panel 5 Remove the two screws D attaching the CD changer unit to both sides of the front panel assembly 6 Draw the CD changer unit upward from behind while pull ing the rear panel outward Fig 4 Fig 5 Fig 6 Fig 7 CD changer unit Card wire Adhesion tape CW104 CD board CD ch...

Page 8: ... Remove the two screws F attaching the front panel assem bly to both sides of the body 5 Remove the screw G attaching the main board to the front panel assembly 6 Remove the screw H attaching the front panel assembly to bottom of the body 7 Release the two joints1 and two joints2 and detach the front panel assembly toward the front Fig 8 Fig 9 Fig 10 Main board Amp board CW101 CW109 CW110 CW108 AC...

Page 9: ...heat sink upward remove the claws Then pull out the heat sink amp board inward 3 1 6 Removing the tuner board See Fig 12 and 13 Prior to performing the following procedure remove the metal cover 1 Disconnect the card wire from the connector CON01 on the tuner board 2 Remove the two screws L attaching the tuner board to the rear panel 3 1 7 Removing the rear panel See Fig 12 Prior to performing the...

Page 10: ...rd Fig 14 3 1 10 Removing the power ICs See Fig 15 and 16 Prior to performing the following procedure remove the metal cover CD changer unit and heat sink amp board 1 Unsolder the power ICs solder points 2 Remove the four screws P attaching the power ICs to the heat sink Fig 15 Fig 16 3 1 11 Removing the power transformer See Fig 17 Prior to performing the following procedure remove the metal cove...

Page 11: ...or on the mecha board 3 Remove the fourteen screws B attaching the front board 4 Disconnect the card wire from the connector UCW01 on the front board Fig 1 Fig 2 3 2 3 Removing the headphone jack board See Fig 3 Prior to performing the following procedure remove the front board 1 You can pull out the headphone jack board 3 2 4 Removing the cassette mechanism assembly See Fig 3 1 Disconnect the car...

Page 12: ...rom connector CW103 on the CD board 3 Push down the two tray stoppers marked a and pull out the CD tray Fig 1 Fig 2 3 3 2 Reinstall the CD tray See Fig 3 and 4 1 Align the gear cam with the gear tray as shown fig 3 then mount the CD tray 2 When assembling the CD tray take extreme care not en gage with gear synchro Fig 3 Fig 4 Loading pulley gear CW103 CD tray CD board CD tray CW103 on the CD board...

Page 13: ...rness from the connector CW1 on the sensor board Fig 5 3 3 4 Removing the turn tray motor See Fig 6 and 7 Prior to performing the following procedure remove the CD tray and sensor board 1 Remove the screw B attaching the turn tray Detach the turn tray from the base tray 2 Pull outward the tab b attaching the turn tray motor on the base tray and detach the turn tray motor Fig 6 Fig 7 Tab a Sensor b...

Page 14: ...ol der the CD pick up unit assembly might destroy 3 Disconnect the motor wire harness from connector on the CD board 4 Remove the screw C attaching the switch board and re lease the two tabs e attaching the switch board outward and detach the switch board 5 Remove the two screws D attaching the CD board First re lease the two tabs f and two tabs g attaching the motor then release the CD board If t...

Page 15: ...embly might destroy 2 Remove the screw E attaching the shaft on the right side of the CD mechanism holder assembly Pull outward the stopper fixing the shaft on the left side and remove the CD mechanism holder assembly from behind in the direction of the arrow y 3 Turn the CD mechanism holder assembly half around the lift up slide shaft h of the CD mechanism holder assembly until the turn table is ...

Page 16: ...he pickup unit 3 4 2 Removing the motor board See Fig 2 1 Unsolder the motor terminal on the motor board 2 Remove the moter board 3 4 3 Removing the feed motor See Fig 1 1 Remove the two motor fixing screws at B and removing the feed motor 3 4 4 Removing the spindle motor The spindle motor cannot be removed as a single unit When removing the spindle motor change the chasis and turn table together ...

Page 17: ... screw A on the right side of the R P head 2 Remove the screw B on the left side of the R P head 3 5 2 Remove the erase head See Fig 1 1 Remove the screw C fixing the erase head Fig 1 Fig 2 3 5 3 Remove the pinch roller See Fig 3 1 Pull out the pinch roller stopper 2 Pull out the pinch roller Fig 3 R P Head E Head Pinch roller A B C R P Head Spring A B Pinch roller Pinch roller stopper ...

Page 18: ...lder the four solder parts a and the four solder parts b 2 Remove the two screws E attaching the mecha board Fig 4 Fig 5 Fig 6 3 5 6 Removing the flywheel See Fig 7 and 9 1 Remove the cut washer at c from the capstan shaft then remove the flywheel When reassembling the flywheel be sure to use new washers as they cannot be reused Fig 7 Fig 8 Fig 9 Plastic cover Claw D Drive belt Drive belt Motor Mo...

Page 19: ...ching the side panel and re move the side panel Fig 1 3 6 2 Removing the side speaker See Fig 2 and 3 Prior to performing the following procedure remove the side panel 1 Remove the four screws B attaching the side speaker 2 Pull out the side speaker and remove the speaker cord from the speaker terminal Fig 2 Fig 3 Side panel A A A Side speaker B Side speaker Speaker terminal ...

Page 20: ...nts 4 1 1 Tuner Adjustment Location of Tuner PCB Fig 1 4 OSC Voltage AM MW OSC Adjustment Output 1 7 0 0 5V Received FREQ Adjustment point 522 1611 KHz MO AM MW RF Adjustment ITEAM 594 KHz MA Maximum Output Fig1 4 FM DET AA SVR1 AM IF MO MA MAIN PCB VT GND TESTER ...

Page 21: ...lloscope AM MW I F Adjustment Maximum output Figure 1 3 SSG FREQ Frequency Adjustment point 450 kHz 522 kHz AM IF OUTPUT AM SSG 450KHZ INPUT AM ANT IN Speaker Terminal 60cm AM IF VTVM Oscilloscope Figure1 3 AM I F Adjustment OUTPUT Output 28 dB 2dB FM Search Level Adjustment Adjust SVR1 Figure 1 2 Adjust FM S S G level to 28dB SSG FREQ Adjustment point SVR1 98 MHz BEACON SENSITIVITY SEMI VR 10K Fi...

Page 22: ...d to the frequency counter Turn VSR1 to left and right FRONT PCB 3KHz Remark Standard To Adjust Pre Setup Item Step Pre Setup Condition 1 Deck 1 MTT 111 2 Press PLAY SW button 3 Deck 2 Same as above MAIN PCB output SPK OUT Frequency Counter Figure 1 5 SPK OUT Figure 1 7 In Out MAIN PCB Oscilloscope 1 range Figure 1 8 Audio OSC SET MAIN PCB Oscilloscope AUX IN VTVM IN SPK OUT IN OUT TP Figure 1 6 R...

Page 23: ...up Condition AfterputtingMTT 114NintoDeck1 PressFWDPLAY button 1 2 MAX OUTPUT and same phase both channels CHECK TO 7mV 0 5mV Remark To Adjust Pre Setup Item Step Pre Setup Condition AfterputtingMTT 5512intoDeck2 1 PressRECPLAYbutton 2 TAPEPCBJCW3 connected toVTVM 1 Adjust Deck 1 Play Level AZIMUTH SPKOUT VTVMiscon nectedtothe scope Fig1 8 After adjust ment secure it with REGION LOCK AfterputtingM...

Page 24: ... Input voltage normal Front board Does UX102 10MHz oscillate Front board When the power is ON H displays at pin no 80 UIC01 Check the Main board PIC02 L4959 Check the Main board PIC02 L4959 Check the Front board UD103 IN4002 Check the Main board PBD01 PBL403 RFS9 Check the Power board Fuse P T RFS2 RFS5 RFS6 Check the Main board PR212 PZ101 PR213 PR214 PR215 PD201 No No No No No Yes Yes Yes Yes Ye...

Page 25: ... Power board Fuse P T RFS2 RFS5 RFS6 RFS7 RFS8 Check the AMP board FIC01 WIC01 No No No No No Yes Yes Yes Yes Yes Remove it with Remocon Check Headphone jack soldering condition Check the Front board UIC01 micon COM UIC03 PT8300 Check the AMP board AQ50L 50R AQ603 AQ 50L 50R AQ 603 Emitter B Is Mute selected Headphone Jack short UIC03 PT8300 pin17 Check the H ...

Page 26: ...VT Level Changeable pin28 ICO1 LV23000 if input normal pin 1 4 Check the Main board EZD02 ER104 Check the Tuner board ICO1 LV23000 pin 15 16 17 18 Check the Frpnt board UIC01 micon com Check the Front board ICO1 LV23000 Oscillator XTAL 75KHz Check the Tuner board FM pack MW OSC MW ANT Check the Main board EIC01 TDA7442D Function IC No No No No Yes Yes Yes Yes ...

Page 27: ...board JIC01 HA12237F pin 3 4 27 28 input signal normal Main board JIC01 HA12237F PIN5 26 output signal normal Check the Main board EIC01 TDA7442D Function IC Check the MAIN board PIC02 PU210 Check the MAIN board CW109 CW110 Check the MAIN board JE01L JE01R JR03L JR03R No No No Yes Yes Yes ...

Page 28: ...402 6 5V Check Roullette control sensor CW105 5 RL SENSE Check oscillation of x201 16 93MHZ Check pin 19 of KB9226 WDCK 88 2KHZ Check the signal of CW105 MCK MDATA MLT Check the limit switch 5 6 of CW102 Check 26 of WIC101 SLO Check 11 12 of WIC301 Check 7 of WIC101 FRSH Check 31 of WIC101 FEO Check 26 27 of WIC301 Check 37 of WIC101 LD Check TR Q101 R101 Check Laser diode of pick up Check 11 12 1...

Page 29: ...MP3 PLAY END Yes Yes No 1 Check the Connection Line between IC201 and IC601 IC301 5 16 9 MHz IC601 20 21 22 24 25 26 27 DATA Line 2 Check the RAM Connection Line between IC602 and IC601 3 Check the MICOM Connection Line IC601 35 36 37 38 39 ...

Page 30: ... No MB080 AV MULTIMEDIA COMPANY AUDIO VIDEO SYSTEMS CATEGORY 10 1 1chome Ohwatari machi Maebashi city 371 8543 Japan VICTOR COMPANY OF JAPAN LIMITED WPC Printed in Japan ...

Page 31: ...SP MXGA8 SP MXGA8 CA MXGA8 CD 1 DISC CHANGE DISPLAY CD 2 CD 3 TUNING STANDBY RANDOM PROGRAM DUBBING REC START STOP CD REC START SET CLOCK TIMER CANCEL DEMO S OU N D T U R B O TAPE A B REPEAT PHONES TUNING C O M P A C T C O M P O N E N T S Y S T E M M X G A 8 R O C K P O P CLASSIC D A N C E H A L L STADIUM SOUND MODE VOLUME EJECT EJECT S U B W OOF E R L E V E L PRESET STANDBY ON BEEP M P 3 Area Suf...

Page 32: ...e silk screen printed side parts side of the PWB diagrams the parts that are printed over with black such as the resistor diode and ICP or identified by the mark nearby are critical for safety This regulation does not correspond to J and C version ...

Page 33: ...2 1 Block diagram ...

Page 34: ...2 2 Parts are safety assurance parts When replacing those parts make sure to use the specified one Standard schematic diagrams Main section ...

Page 35: ...2 3 Parts are safety assurance parts When replacing those parts make sure to use the specified one Amp section ...

Page 36: ...2 4 Front section ...

Page 37: ...2 5 Pirnted circuit boards Main board Power board ...

Page 38: ...2 6 Front board Trans board ...

Page 39: ... M E M O ...

Page 40: ...VICTOR COMPANY OF JAPAN LIMITED AV MULTIMEDIA COMPANY AUDIO VIDEO SYSTEMS CATEGORY 10 1 1chome Ohwatari machi Maebashi city 371 8543 Japan No MB080SCH Printed in Japan WPC ...

Page 41: ...d parts list Block No M1 Speaker assembly and parts list Block No M2 CD changer mechanism assembly and parts list Block No MA Cassette mechanism assembly and parts list Block No MP Electrical parts list Block No 01 04 Packing materials and accessories parts list Block No M3 MX GA8 3 2 3 5 3 6 3 8 3 10 3 18 Area suffix JW Mexico Panama MB080 ...

Page 42: ...VFD CD changer mechanism Cassette mechan Main board CD switch board Phone ja boar Block No M M M 1 44 44 67 x2 37 x2 38 x2 71 x2 72 x2 40 1 15 13 13 14 3 7 6 2 66 5 69 27 26 30 4 39 41 9 23 8 11 22 28 16 53 19 60 17 20 28 59 12 34 63 36 68 74 74 68 68 31 67 24 1 24 2 24 3 ...

Page 43: ...ard Front board Phone jack board Fuse board Trans board Amp board Tuner board RFS5 RFS2 RFS6 RFS7 RFS8 68 68 69 69 69 69 69 69 3 17 57 12 29 32 42 56 33 45 64 47 61 43 68 68 73 70 68 46 32 34 74 35 25 1 25 2 25 3 62 65 68 72 ...

Page 44: ...MIRROR 31 AH61 01261A PCB BRAKET 32 AH61 01262A H SINK BRAKET x2 33 AH64 02273D REAR CABINET 34 AH62 00042A HEAT SINK 4959 35 AH63 00278A PCB COVER 36 AH61 40014A SUPPORT RIVET 37 AH95 50001A LATCH ASSY x2 38 AH61 80030A DAMPER ASSY x2 39 AH61 00552A DOOR SPRING A 40 AH61 00553A DOOR SPRING B 41 AH64 00462C BADGE JVC 42 AH64 30416E BOTTOM CABINET 43 AH64 30390K TOP CABINET 44 AH69 20031A CUSHION F...

Page 45: ...ck No M M M 2 2 1 3 5 4 Symbol No Part No Part Name Description Local 1 AH81 00959F SIDE PANEL LEFT 1 AH81 00959E SIDE PANEL RIGHT 2 AH81 01121A SCREW 4 0X40mm BK x5 3 AH81 00959M SPEAKER 130mm 6ohm 120W 4 AH81 00959Z SCREW 3 5mmX16mm BK x4 5 AH91 00959X SHEET EVA ...

Page 46: ...3 6 CD changer mechanism assembly and parts list Block No M M M A Base main Tray stopper CD sub board 1 2 8 3 7 4 5 6 10 9 11 12 13 14 15 16 17 18 19 20 21 22 23 24 26 26 25 27 CMS 300 ...

Page 47: ...0 11 AH66 20193A GEAR ROULETTE POM M90 44 BLK 12 AH66 90056A TRAY ROULETTE ABS XR 401 BLK 13 AH66 90055A TRAY DISC ABS XR 401 BLK 14 AH32 10001F SENSOR KPI L06 15 AH61 20428A 1 BASE MAIN CMS 300 BLK 16 3302 000159 MAGNET FERR1TE 3500 3800G 6P 17 AH66 90053A TABLE CHUCK UNI BLK CMS300 18 AH63 00068B SHEET CHUCK HYMERON BLK 0 4 19 3404 000101 SWICH MICRO MLS 24 20 AH31 10021A DC MORTOR RF 500TB 9VDC...

Page 48: ...elow can be supplied However parts that are not listed below cannot be supplied individually but only by purchasing the whole Cassette Mechanism Assembly Unit When ordering use the Parts No AH59 01132A for Cassette Mechanism Assembly Unit CWM43FF09 11 7 8 6 5 4 11 7 14 12 13 8 16 3 1 15 3 15 1 16 2 10 ...

Page 49: ...093 4879 5 AH81 00902G BF BELT 02 083 4236 6 AH81 00902J AF BELT 02 083 4234 7 AH81 00902K FR BLET 02 083 4188 x2 8 AH81 00902L SOLENOID ASSY 50 093 4748 x2 10 AH81 00902Q HOUSING 6216016100 11 AH81 00472V CLUTCH ASSY 50 093 4503 x2 12 AH81 00902W MODE SWITCH MPU11570MLB0 13 AH81 00902X PHOTO INTERRUPT RP1352 14 AH81 00902Y LEAF SWITCH LSA11355 15 AH81 00903A SPRING62 01 082 4686 x2 16 AH81 00473H...

Page 50: ...W AR123 2001 000258 CARBON RESISTOR 1 8K 5 1 8W AR124 2001 000331 CARBON RESISTOR 12K 5 1 8W AR125 2001 000522 CARBON RESISTOR 22K 5 1 8W AR126 2001 000522 CARBON RESISTOR 22K 5 1 8W AR127 2001 000977 CARBON RESISTOR 8 2K 5 1 8W AR128 2001 000660 CARBON RESISTOR 33K 5 1 8W AR129 2001 000281 CARBON RESISTOR 100 5 1 8W AR130 2001 000281 CARBON RESISTOR 100 5 1 8W AR131 2001 000281 CARBON RESISTOR 10...

Page 51: ... HR02R 2001 000449 CARBON RESISTOR 2 2K 5 1 8W Symbol No Part No Part Name Description Local HR03L 2001 000734 CARBON RESISTOR 4 7K 5 1 8W HR03R 2001 000734 CARBON RESISTOR 4 7K 5 1 8W HR04L 2001 000290 CARBON RESISTOR 10K 5 1 8W HR04R 2001 000290 CARBON RESISTOR 10K 5 1 8W HR06L 2001 000591 CARBON RESISTOR 3 3K 5 1 8W HR06R 2001 000591 CARBON RESISTOR 3 3K 5 1 8W HR101 2001 000028 CARBON RESISTOR...

Page 52: ...TOR 4 7K 5 1 8W FR105 2001 000734 CARBON RESISTOR 4 7K 5 1 8W FR106 2001 000734 CARBON RESISTOR 4 7K 5 1 8W FR107 2001 000734 CARBON RESISTOR 4 7K 5 1 8W FR108 2001 000734 CARBON RESISTOR 4 7K 5 1 8W FR109 2001 000734 CARBON RESISTOR 4 7K 5 1 8W FR110 2001 000734 CARBON RESISTOR 4 7K 5 1 8W FR111 2001 000734 CARBON RESISTOR 4 7K 5 1 8W FR112 2001 000734 CARBON RESISTOR 4 7K 5 1 8W FR113 2001 00073...

Page 53: ...IODE 0401 000101 UD06 1N4148 GE DIODE 0401 000101 UD25 1N4148 GE DIODE 0401 000101 UD101 1N4148 GE DIODE 0401 000101 UD102 1N4148 GE DIODE 0401 000101 UD103 1N4002 FR DIODE 0402 000127 UD104 1N4148 GE DIODE 0401 000101 UD105 1N4002 FR DIODE 0402 000127 UD106 1N4002 FR DIODE 0402 000127 UD107 1N4002 FR DIODE 0402 000127 UD108 1N4002 FR DIODE 0402 000127 UD109 1N4002 FR DIODE 0402 000127 UD110 1N400...

Page 54: ... AC22R 2201 000838 C CAPACITOR 0 003NF 0 25PF AC25L 2301 000375 M CAPACITOR 100NF 10 50V AC25R 2301 000375 M CAPACITOR 100NF 10 50V AC30L 2301 000412 M CAPACITOR 22NF 10 50V AC30R 2301 000412 M CAPACITOR 22NF 10 50V AC33L 2301 000412 M CAPACITOR 22NF 10 50V AC33R 2301 000412 M CAPACITOR 22NF 10 50V AC50L 2201 000381 C CAPACITOR 22NF 80 50V AC50R 2201 000381 C CAPACITOR 22NF 80 50V AC51L 2201 00038...

Page 55: ...2001 000027 CARBON RESISTOR 100 5 1 4W AR50L 2001 000864 CARBON RESISTOR 56K 5 1 8W AR50R 2001 000864 CARBON RESISTOR 56K 5 1 8W AR51L 2001 001000 CARBON RESISTOR 82K 5 1 8W AR51R 2001 001000 CARBON RESISTOR 82K 5 1 8W AR52L 2001 000429 CARBON RESISTOR 1K 5 1 8W AR52R 2001 000429 CARBON RESISTOR 1K 5 1 8W AR53L 2001 000522 CARBON RESISTOR 22K 5 1 8W AR53R 2001 000522 CARBON RESISTOR 22K 5 1 8W AR5...

Page 56: ...CHIP RESISTOR 56K 5 1 10W R127 2007 001208 CHIP RESISTOR 82K 5 1 10W R128 2007 000653 CHIP RESISTOR 27K 5 1 10W R129 2007 000941 CHIP RESISTOR 47K 5 1 10W R132 2007 000300 CHIP RESISTOR 10K 5 1 10W R133 2007 000300 CHIP RESISTOR 10K 5 1 10W R201 2007 000290 CHIP RESISTOR 100 5 1 10W R202 2007 000477 CHIP RESISTOR 1M 5 1 10W R203 2007 000290 CHIP RESISTOR 100 5 1 10W R204 2007 000468 CHIP RESISTOR ...

Page 57: ...3 17 MEMO ...

Page 58: ...3 18 Packing materials and accessories parts list Block No M M M 3 A1 A6 A7 A2 A8 A9 P5 A5 A3 A4 P3 P1 P7 P8 P8 P2 P4 P6 ...

Page 59: ... 5 BATTERY x2 A 6 AH68 00415J IMPORTANT CARD A 7 AH68 00416A SAFETY CARD A 8 AH81 00959B SPEAKER BOX R A 9 AH81 00959A SPEAKER BOX L P 1 AH69 00906E PACKING CASE SET P 2 AH69 00867C CUSHION FRONT P 3 AH69 00868C CUSHION REAR P 4 6902 000068 PORY BAG SET P 5 6902 000525 PORY BAG INSTRUCTIONS P 6 AH81 00959Q CUSHION TOP SPEAKER BOX P 7 AH81 00929R CUSHION BOTTOM SPEAKER BOX P 8 AH81 00631U PORY BAG ...