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JVC MX-GA8 Service Manual

Compact component system
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SERVICE MANUAL
COMPACT COMPONENT SYSTEM
12
2003
MB080
SP-MXGA8
1
Precaution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2
Specific Service Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
3
Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
4
Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
5
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LIMITED
MX-GA8
1
2
3
CD
CD
STANDBY
STANDBY/ON
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
REC START
/ STOP
CD REC
START
DUBBING
DISPLAY
PHONES
PRESET
SOUND
TURBO
SUBWOOFER LEVEL
TUNING
TUNING
BEEP
EJECT
CA-MXGA8

TABLE OF CONTENTS

DISC CHANGE
REPEAT
PROGRAM
RANDOM
CLOCK
/ TIMER
SET
CANCEL
/ DEMO
TAPE A / B
EJECT
SP-MXGA8
Area Suffix
JW ------- Mexico,Panama
No.MB080
2004/1

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  • Page 1 SERVICE MANUAL COMPACT COMPONENT SYSTEM MB080 2003 MX-GA8 DISC CHANGE STANDBY STANDBY/ON 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...
  • Page 2 SPECIFICATION 120 W per channel, min. RMS, driven into 6 Ω at 63 Hz with no more Amplifier section Output Power SUBWOOFERS than 10% total harmonic distortion. MAIN SPEAKERS 60 W per channel, min. RMS, driven into 4 Ω at 1 kHz with no more than 10% total harmonic distortion.

  • Page 3: Precaution

    SECTION 1 PRECAUTION Safety Precautions (1) This design of this product contains special hardware and voltmeter. many circuits and components specially for safety purpos- Move the resistor connection to each exposed metal es. For continued protection, no changes should be made part, particularly any exposed metal part having a return to the original design unless authorized in writing by the path to the chassis, and measure the AC voltage across...
  • Page 4 Preventing 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. 1.5.1 Grounding to prevent damage by static electricity Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as CD players.

  • Page 5: Specific Service Instructions

    SECTION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS. (No.MB080)1-5...

  • Page 6: Disassembly

    SECTION 3 DISASSEMBLY Main body 3.1.1 Removing the metal cover Metal cover (See Fig. 1) (1) Remove the three screws A attaching the metal cover on the back of the body. (2) Remove the six screws B attaching the metal cover on both sides of the body.
  • Page 7 3.1.3 Removing the CD changer unit Card wire (See Fig. 4 to 7) CD changer unit • Prior to performing the following procedure, remove the metal cover and CD tray fitting. (1) Remove the card wire attached to CD changer unit on the adhesion tape.
  • Page 8 3.1.4 Removing the front panel assembly Front panel Main board (See Fig. 8 to 10) assembly • Prior to performing the following procedure, remove the metal CW101 cover and CD changer unit. CW109 (1) Disconnect the card wire from the connector CW101 on the ACW1...
  • Page 9 3.1.5 Removing the heat sink & amp. Board Rear panel (See Fig. 8, 11 and 12) • Prior to performing the following procedure, remove the metal cover and CD changer unit. (1) Disconnect the card wire from the connector ACW1 the harness from the connector ACW2 on the amp.
  • Page 10 3.1.8 Removing the main board CW101 (See Fig. 14) CW109 • Prior to performing the following procedure, remove the metal CW110 cover, CD changer unit and rear panel. Main board (1) Disconnect the card wire from the connector CW101 CW108 the harness from the connector CW108, CW109 Fuse board...
  • Page 11 Front panel assembly CD switch board • Prior to performing the following procedure, remove the front panel assembly. 3.2.1 Removing the CD switch board UCW03 (See Fig. 1) (1) Disconnect the card wire from the connector UCW03 Front board the CD switch board. (2) Remove the four screws A attaching the CD switch board.
  • Page 12 CD changer unit • Prior to performing the following procedure, remove the CD CD tray changer unit. 3.3.1 Removing the CD tray (See Fig. 1 and 2) (1) Turn the black loading pulley gear on the under side of the CD board CD changer unit in the direction of the arrow and draw the Loading pulley...
  • Page 13 3.3.3 Removing the sensor board (See Fig. 5) • Prior to performing the following procedure, remove the CD tray. (1) Remove the screw A attaching the sensor board on the CD tray. (2) Remove the sensor board releasing the two tabs a. (3) Disconnect the harness from the connector on the sensor board.
  • Page 14 3.3.5 Removing the belt, the CD board and the switch board (See Fig. 8 and 9) Belt • Prior to performing the following procedure, remove the CD tray. (1) Detach the belt from the pulley on the upper side of the CD changer unit (Do not stain the belt with grease).
  • Page 15 3.3.6 Removing the CD mechanism holder assembly (mechanism included) (See Fig. 10 to 13) (1) Disconnect the harness from connector on the CD mecha- nism board in the CD mechanism assembly on the under side of the CD changer unit. Disconnect the card wire from the pickup unit connector.
  • Page 16 CD mechanism section Shutter Shaft • Removing the CD mechanism holder from the CD chager unit. Pickup unit (Refer to "Removing the CD mechanism holder assembly" ) 3.4.1 Removing the pickup unit (See Fig. 1) (1) Removing the cut washer on the feed gear sleeve and pull out the feed gear.
  • Page 17 Cassette mechanism section R/P Head • Prior to performing the following procedure, remove the cas- sette mechanism assembly. 3.5.1 Removing the R/P head. (See Fig. 1 and 2) (1) Remove the 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.
  • Page 18 3.5.4 Removing the motor Motor (See Fig. 4 to 6) terminal Solder Solder (1) Slide the plastic cover in the direction of the arrow, and re- part a part b Mecha. board move the three claws. Then remove the plastic cover. (2) Remove the two screws D fixing the motor.
  • Page 19 Speaker section • It is exchange in a unit. Please do not decompose as much as possible. 3.6.1 Removing the side panel (See Fig. 1) (1) Remove the five screws A attaching the side panel and re- move the side panel. Side panel Fig.1 3.6.2 Removing the side speaker...

  • Page 20: Adjustment

    SECTION 4 ADJUSTMENT Alignment and Adjustments 4.1.1 Tuner FM DET AM IF SVR1 * Adjustment Location of Tuner PCB AM(MW) RF AM(MW) OSC ITEAM Adjustment Adjustment Received FREQ. 594 KHz 522~1611 KHz Adjustment point Maximum 1~7.0 0.5V Output Output(Fig1-4) MAIN TESTER Fig 1-4 OSC Voltage 1-20 (No.MB080)
  • Page 21 FM THD Adjustment Output SSG FREQ. 98 MHz Antenna Terminal Adjustment Oscilloscope point FM DETECTOR COIL FM S.S.G Input (FM DET) Speaker 60 dB Output Terminal Input output Minumum Distortion (0.4% below) Distortion Meter (Figure 1-1) Figure1-1 IF CENTER and THD Adjustment FM Search Level Adjustment FM Antenna 28 dB...
  • Page 22 4.1.2 Cassette Deck To Adjust Tape Speed Notes MAIN PCB Frequency Counter 1) Measuring tape: i) MTT-111 (or equivalent) (Tapes recorded with 3kHz) SPK OUT ii) MTT-5512 (or equivalent) output 2) Connect the SPK OUT of the MAIN PCB to the fre- quency counter as in figure 1-5.
  • Page 23 To Adjust PlayBack Level/REC Notes 1) Before the actual adjustment, clean the play/recording head. 2) Measuring tape : i) MTT-114N(or equivalent 10kHz AZIMUTH control) ii) MTT-5512 3) The cassette deck is connections as shown in figure 1-7. 1. Adjust Deck 1 Play Level Pre-Setup Pre-Setup Item...

  • Page 24: Troubleshooting

    SECTION 5 TROUBLESHOOTING Amplifier Power Malfunction : COMMON -Check the Main board; Front board micon -com Main board PIC02(L4959) PBD01 (PBL403) RFS9 VDD(5V) normal? pin No.2 ,10 Input -Check the Power board; UIC1 pin no.17,46,90 voltage normal? Fuse P/T,RFS2,RFS5,RFS6 -Check the Main board PIC02 (L4959) -Check the Front board UD103 (IN4002)
  • Page 25 No Output : MXGA7/GA8 Check the B+,B- Power source AMP board PBD01,PBD02,RFS9 1 FIC01 : pin no.1,2,7 Check the Power board 2 WIC01 : pin no.1,2,5,6,12,13 Fuse,P/T,RFS2,RFS5, B+,B- normal? RFS6,RFS7,RFS8 AQ 50L,50R,AQ 603 Check the AMP board Emitter B+? FIC01,WIC01 Is Mute selected? Remove it with Remocon.
  • Page 26 Tuner Malfunction(FM/AM) : COMMON Main board Check the Main board CW102 PIN NO2, 9V EZD02, ER104. Voltage normal? Check the Tuner board ICO1(LV23000) ICO1(LV23000)of tuner board, pin 15,16,17,18 Tuner BAND Switching? Check the Frpnt board (pin29) UIC01(micon -com) Check the Front board ICO1(LV23000) ICO1(LV23000) Oscillator VT Level Changeable?
  • Page 27 Tape : COMMON Main board Check the MAIN board JIC01(HA12237F) B+,PIN NO16 PIC02, PU210 Voltage normal? Main board Check the MAIN board JIC01(HA12237F) pin 3,4,27,28 CW109, CW110 input signal normal? Main board Check the MAIN board JIC01(HA12237F) PIN5,26 JE01L,JE01R,JR03L,JR03R output signal normal? Check the Main board EIC01(TDA7442D) Function IC (No.MB080)1-27...
  • Page 28 COMMON POWER ON and CD FUNCTION MB+/DB+.Check POWER LINE of Main Board Check CD POWER +5V : WIC301, Q301 +3.3V : Q302 MB+=8V, DB+=12V, +5V/3.3V Check OPEN / CLOSE Check OP/CL MOTOR & WIC401, WIC801 CLOSE : SW1=SW2=5V , OPEN : SW1=SW2=0V Check WIC402 &...
  • Page 29 MP3 Parts MP3 FUNCTION MP3 PLAY 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 (No.MB080)1-29...
  • Page 30 VICTOR COMPANY OF JAPAN, LIMITED AV & MULTIMEDIA COMPANY AUDIO/VIDEO SYSTEMS CATEGORY 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan (No.MB080) Printed in Japan...
  • Page 31 SCHEMATIC DIAGRAMS COMPACT COMPONENT SYSTEM MX-GA8 CD-ROM No.SML200401 DISC CHANGE STANDBY STANDBY/ON 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...
  • Page 32 In regard with component parts appearing on the 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 Block diagram...
  • Page 34 Standard schematic diagrams Main section Parts are safety assurance parts. When replacing those parts make sure to use the specified one.
  • Page 35 Amp. section Parts are safety assurance parts. When replacing those parts make sure to use the specified one.
  • Page 36 Front section...
  • Page 37 Pirnted circuit boards Power board Main board...
  • Page 38 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 Printed in Japan (No.MB080SCH)

  • Page 41: Parts List

    PARTS LIST [ MX-GA8] * All printed circuit boards and its assemblies are not available as service parts. Area suffix JW --------------- Mexico,Panama - Contents - 3 - 2 Exploded view of general assembly and parts list (Block No.M1) 3 - 5 Speaker assembly and parts list (Block No.M2)
  • Page 42 Exploded view of general assmbly and parts list Block No. Main board CD changer mechanism Phone ja CD switch boar board 24-1 24-2 24-3 67 x2 71 x2 37 x2 38 x2 72 x2 Cassette mechan...
  • Page 43 board Amp. board Phone jack board Tuner board RFS5 RFS6 RFS7 RFS8 25-1 Trans. board Fuse board 25-2 RFS2 25-3 echanism...
  • Page 44 AH61-40014A SUPPORT RIVET AH95-50001A LATCH ASSY (x2) AH61-80030A DAMPER ASSY (x2) AH61-00552A DOOR SPRING A AH61-00553A DOOR SPRING B AH64-00462C BADGE JVC AH64-30416E BOTTOM CABINET AH64-30390K TOP CABINET AH69-20031A CUSHION FOOT (x2) AH63-00250B HEAT SINK COVER AH62-00080A HEAT SINK MAIN ...
  • Page 45 Speaker assmbly and parts list Block No. Speaker Block No. [M][2][M][M]  Symbol No. Part No. Part Name Description Local AH81-00959F SIDE PANEL LEFT AH81-00959E SIDE PANEL RIGHT AH81-01121A SCREW 4.0X40mm BK(x5) 130mm 6ohm AH81-00959M SPEAKER 120W 3.5mmX16mm AH81-00959Z SCREW BK(x4) AH91-00959X SHEET...

  • Page 46: Cd Changer Mechanism Assembly And Parts List

    CD changer mechanism assembly and parts list Block No. CMS-300 Base main Tray stopper CD sub board...
  • Page 47 CD changer mechanism Block No. [M][A][M][M]  Symbol No. Part No. Part Name Description Local AH66-80022A SLIDER CAM ABS HF-380 NTR AH66-60034A BELT LOAD AH66-20186A GEAR PULLEY POM M90-44 WHT AH66-20187A GEAR LOAD POM M90-44 BLK AH66-20188A GEAR CAM POM M90-44 WHT AH66-20189A GEAR TRAY POM M90-44 BLK...

  • Page 48: Cassette Mechanism Assembly And Parts List

    Cassette mechanism assembly and parts list Block No. CWM43FF09 Note: Parts listed on the Parts List below 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.)

  • Page 49: Cassette Mechanism

    Cassette mechanism Block No. [M][P][M][M]  Symbol No. Part No. Part Name Description Local AH81-00472A R/P HEAD TC881CB067P(x2) AH81-00472B E HEAD TC2131 AH81-00472N PINCH ROLLER 22-027-41054(x2) AH81-00902E MOTOR ASSY 50-093-4879 AH81-00902G BF BELT 02-083-4236 AH81-00902J AF BELT 02-083-4234 AH81-00902K FR BLET 02-083-4188(x2) AH81-00902L SOLENOID ASSY...

  • Page 50: Electrical Parts List

    Electrical parts list Main board  Symbol No. Part No. Part Name Description Local Block No. [0][1][0][0] AR123 2001-000258 CARBON RESISTOR 1.8K 5% 1/8W  Symbol No. Part No. Part Name Description Local AR124 2001-000331 CARBON RESISTOR 12K 5% 1/8W AR125 2001-000522 CARBON RESISTOR 22K 5% 1/8W...
  • Page 51  Symbol No. Part No. Part Name Description Local  Symbol No. Part No. Part Name Description Local EE03R 2401-001912 E CAPACITOR 1UF 20% 50V HR03L 2001-000734 CARBON RESISTOR 4.7K 5% 1/8W EE04L 2401-001912 E CAPACITOR 1UF 20% 50V HR03R 2001-000734 CARBON RESISTOR 4.7K 5% 1/8W EE04R...

  • Page 52: Front Board

     Symbol No. Part No. Part Name Description Local  Symbol No. Part No. Part Name Description Local JR113 2001-000522 CARBON RESISTOR 22K 5% 1/8W CW01B AH39-00247A LEAD CONNECTOR JVR01 2103-000248 ROTA V RESISTOR 200K 30% 1/10W FR101 2001-000734 CARBON RESISTOR 4.7K 5% 1/8W JVR02 2103-000248 ROTA V RESISTOR 200K 30% 1/10W...
  • Page 53  Symbol No. Part No. Part Name Description Local  Symbol No. Part No. Part Name Description Local LD105 0601-001739 ROUND RED UC131 2201-000783 C CAPACITOR 100NF +80-20% 5 LD106 0601-001739 ROUND RED UC132 2202-000797 C CAPACITOR 10NF 30% 16V LD107 0601-001739 ROUND RED...
  • Page 54  Symbol No. Part No. Part Name Description Local  Symbol No. Part No. Part Name Description Local UR135 2001-000290 CARBON RESISTOR 10K 5% 1/8W AC22R 2201-000838 C CAPACITOR 0.003NF 0.25PF UR136 2001-000290 CARBON RESISTOR 10K 5% 1/8W AC25L 2301-000375 M CAPACITOR 100NF 10% 50V UR137...
  • Page 55  Symbol No. Part No. Part Name Description Local  Symbol No. Part No. Part Name Description Local AR47 2001-000290 CARBON RESISTOR 10K 5% 1/8W AR54R 2001-000786 CARBON RESISTOR 47K 5% 1/8W AR49 2001-000290 CARBON RESISTOR 10K 5% 1/8W AR55L 2001-000591 CARBON RESISTOR 3.3K 5% 1/8W AR50...
  • Page 56  Symbol No. Part No. Part Name Description Local  Symbol No. Part No. Part Name Description Local C204 2203-000203 CHIP CAPACITOR 100NF 10% 16V R206 2007-000468 CHIP RESISTOR 1K 5% 1/10W C205 2203-000203 CHIP CAPACITOR 100NF 10% 16V R207 2007-000468 CHIP RESISTOR 1K 5% 1/10W...
  • Page 57 <MEMO> 3-17...

  • Page 58: Packing Materials And Accessories Parts List

    Packing materials and accessories parts list Block No. 3-18...
  • Page 59 Packing and accessories Block No. [M][3][M][M]  Symbol No. Part No. Part Name Description Local AH68-01227H INST ENG SPA LVT1010-007A AH59-01163C REMOCON ASSY AH38-10001A FM WIRE AH42-20001P ANT LOOP ------------ BATTERY (x2) AH68-00415J IMPORTANT CARD AH68-00416A SAFETY CARD AH81-00959B SPEAKER BOX R AH81-00959A SPEAKER BOX L AH69-00906E...

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