JVC-MXGA8-cs-sm 电路图 维修手册.pdf

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1、SERVICE MANUAL COPYRIGHT 2003 VICTOR COMPANY OF JAPAN, LIMITED No.MB080 2004/1 COMPACT COMPONENT SYSTEM MB080200312 MX-GA8 TABLE OF CONTENTS 1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-

2、3 2SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5 3DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

3、-6 4ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20 5TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4、 . . . . 1-24 SP-MXGA8SP-MXGA8CA-MXGA8 CD 1 DISC CHANGE DISPLAY CD 2CD 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

5、 C E H A L L STADIUM S O U N D M O D E V O L U M E EJECTEJECT SUBWOOFER LEVEL PRESET STANDBY/ON BEEP Area Suffix JW - Mexico,Panama RadioFans.CN 收音机爱 好者资料库 1-2 (No.MB080) SPECIFICATION Design and specifications are subject to change without notice. Amplifier section Output PowerSUBWOOFERS120 W per c

6、hannel, min. RMS, driven into 6 at 63 Hz with no more than 10% total harmonic distortion. MAIN SPEAKERS 60 W per channel, min. RMS, driven into 4 at 1 kHz with no more than 10% total harmonic distortion. Audio input sensitivity/ Impedance (at 1 kHz, measured at MAIN SPEAKERS) AUX400 mV/50 k Speakers

7、/ImpedanceSubwoofers6 - 16 Main speakers4 - 8 TunerFM tuning range87.50 MHz - 108.00 MHz AM tuning range530 kHz - 1 710 kHz CD playerCD Capacity 3 CDs Dynamic range 85 dB Signal-to-noise ratio 85 dB Cassette deckFrequency response Normal (type I) 50 Hz - 14 000 Hz Wow and flutter0.15% (WRMS) General

8、Power requirementAC 120 V , 60 Hz Power consumption160 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 Type3-way bass-reflex type Speaker unitsSubwoofer13.5 cm cone 1 Main Woofer16 cm cone 1 Tweeter5 cm cone 1 Power handling ca

9、pacity Subwoofer120 W Main speaker60 W ImpedanceSubwoofer6 Main speaker4 Frequency rangeSubwoofer30 Hz - 70 Hz Main speaker70 Hz - 20 000 Hz Sound pressure levelSubwoofer73 dB/Wm Main speaker86 dB/Wm Dimensions (approx.)290 mm 317 mm 336 mm (W/H/D) Mass (approx.)5.5 kg each RadioFans.CN 收音机爱 好者资料库 (

10、No.MB080)1-3 SECTION 1 PRECAUTION 1.1Safety Precautions (1) This design of this product contains special hardware and many circuits and components specially for safety purpos- es. For continued protection, no changes should be made to the original design unless authorized in writing by the manufactu

11、rer. Replacement parts must be identical to those used in the original circuits. Services should be per- formed by qualified personnel only. (2) 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

12、or additions will void the manufacturers warranty and will further relieve the manufacture of responsibility for personal injury or property damage resulting therefrom. (3) Many electrical and mechanical parts in the products have special safety-related characteristics. These characteris- tics are o

13、ften not evident from visual inspection nor can the protection afforded by them necessarily be obtained by us- ing replacement components rated for higher voltage, watt- age, etc. Replacement parts which have these special safety characteristics are identified in the Parts List of Ser- vice Manual.

14、Electrical components having such features are identified by shading on the schematics and by ( ) on the Parts List in the Service Manual. The use of a substitute replacement which does not have the same safety charac- teristics as the recommended replacement parts shown in the Parts List of Service

15、 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

16、 service is required, the original lead routing and dress should be observed, and it should be confirmed that they have been returned to normal, after reassem- bling. (5) Leakage shock hazard testing After reassembling the product, always perform an isola- tion check on the exposed metal parts of th

17、e product (an- tenna 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

18、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 earth ground. Any leakage cur- rent must not exceed 0.5mA AC (r.m.s.). Alternate check method Plug the AC line

19、cord directly into the AC outlet. Use an AC voltmeter having, 1,000 per volt or more sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by a 0.15F AC-type capacitor between an ex- posed metal part and a known good earth ground. Measure the AC voltage across the resistor wit

20、h the AC voltmeter. Move the resistor connection to each exposed metal part, particularly any exposed metal part having a return path to the chassis, and measure the AC voltage across the resistor. Now, reverse the plug in the AC outlet and repeat each measurement. Voltage measured any must not exce

21、ed 0.75 V AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.). 1.2Warning (1) This equipment has been designed and manufactured to meet international safety standards. (2) It is the legal responsibility of the repairer to ensure that these safety standards are maintained. (3) Repairs must be made in

22、 accordance with the relevant safety standards. (4) It is essential that safety critical components are replaced by approved parts. (5) If mains voltage selector is provided, check setting for local voltage. 1.3Caution Burrs formed during molding may be left over on some parts of the chassis. Theref

23、ore, pay attention to such burrs in the case of pre- forming repair of this system. 1.4Critical parts for safety 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 ( ) a

24、nd ICP ( ) or identified by the mark nearby are critical for safety. When replacing them, be sure to use the parts of the same type and rating as specified by the manufacturer. (This regulation dose not Except the J and C version) Good earth ground Place this probe on each exposed metal part. AC VOL

25、TMETER (Having 1000 ohms/volts, or more sensitivity) 1500 10W 0.15 F AC TYPE RadioFans.CN 收音机爱 好者资料库 1-4 (No.MB080) 1.5Preventing 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

26、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. Be careful to use proper grounding in the area wh

27、ere repairs are being performed. (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) Ground yourself Use an anti-static wrist strap to release any static electri

28、city built up in your body. (3) Handling the optical pickup 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.

29、) Do not use a tester to check the condition of the laser diode in the optical pickup. The testers internal power source can easily destroy the laser diode. 1.6Handling the traverse unit (optical pickup) (1) Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, co

30、mplex 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 attach

31、ing it to the connector. (3) Handle the flexible cable carefully as it may break when subjected to strong force. (4) I t is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it. 1.7Attention when traverse unit is decomposed *Please refer to Disassembly method i

32、n the text for the CD pickup unit. Apply solder to the short land sections before the flexible wire is disconnected from the connector on the CD servo board. (If the flexible wire is disconnected without applying solder, the CD pickup may be destroyed by static electricity.) In the assembly, be sure

33、 to remove solder from the short land sections after connecting the flexible wire. 1M Conductive material (conductive sheet) or iron palate (caption) Anti-static wrist strap Soldering Card wire Card wire Picup unit connector Picup unit connector CD changer unit CD changer mechanism (No.MB080)1-5 SEC

34、TION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS. 1-6 (No.MB080) SECTION 3 DISASSEMBLY 3.1Main body 3.1.1Removing the 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 s

35、crews B attaching the metal cover on both sides of the body. (3) Remove the metal cover from the body by lifting the rear part of the cover. ONE POINT 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 tr

36、ay toward the front. Fig.1 Fig.2 3.1.2Removing 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 tray fit- ting upward, remove it. Fig.3

37、 Metal cover A B (both sides) Loading pulley gear (See fig.1) Joint Claw CD tray fitting (No.MB080)1-7 3.1.3Removing the CD changer unit (See Fig. 4 to 7) 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

38、the adhesion tape. (2) Disconnect the card wire from the connector CW105 on the CD board. (3) Disconnect 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 b

39、oth 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 changer unit Main board CW105 Rear panel C D (both sides) Rear panel CD changer unit Front

40、panel assembly 1-8 (No.MB080) 3.1.4Removing the front panel assembly (See Fig. 8 to 10) Prior to performing the following procedure, remove the metal cover and CD changer unit. (1) Disconnect the card wire from the connector CW101 on the main board. (2) Disconnect the harness from the connector CW10

41、8, CW109 and CW110 on the main board. (3) Remove the screw E fixiing the lug wire. (4) 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

42、 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 ACW1 ACW2 Front panel assembly Joint1 (both sides) F (both sides) E(fixing the lug wire) Joint1 (both s

43、ides) F (both sides) Front panel assembly G Main board H Joint2 (No.MB080)1-9 3.1.5Removing the heat sink 5V) Main board PIC02(L4959) pin No.2 ,10 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 PIC

44、02 (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 NoNo NoNo No Yes Yes Yes Yes Yes Replace micon -com (No.MB080

45、)1-25 No Output : MXGA7/GA8 1 FIC01 : pin no.1,2,7 2 WIC01 : pin no.1,2,5,6,12,13 B+,B- normal? AMP board Check the B+,B- Power source PBD01,PBD02,RFS9 Check the 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.

46、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? 1-26 (No.MB080) 5.2Tuner Malfunction(FM/AM) : COMMON Main board C

47、W102 PIN NO2, 9V Voltage normal? ICO1(LV23000)of tuner board, Tuner BAND Switching? (pin29) ICO1(LV23000) 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 -co

48、m) 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 (No.MB080)1-27 5.3Tape : COMMON Main board JIC01(HA12237F) B+,PIN NO16 Voltage normal? Main board JIC01(HA12237F)

49、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 1-28 (No.MB080) 5.4CD COMMON Check CD POWER MB+=8V, DB+=12V, +5V/3.3V Check OPEN / CLOSE CLOSE : SW1=SW2=5V , OPEN : SW1=SW2=0V POWER ON and CD FUNCTION Does Roulette revolve Is Roulette control OK? Does SLED move to inner Is focus search done properly? Does lase