JVC-UXG3-cs-sm 电路图 维修手册.pdf

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1、SERVICE MANUAL COPYRIGHT 2005 Victor Company of Japan, Limited No.MB429 2005/7 MICRO COMPONENT SYSTEM MB42920057 UX-G3, UX-G4 Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade) TABLE OF CONTENTS 1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . .

2、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 2SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 3DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . .

3、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5 4ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16 5TROUBLESHOOTING . . . . . . . . . . . . . . .

4、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19 CA-UXG3SP-UXG3SP-UXG3 CA-UXG4SP-UXG4SP-UXG4 Area suffix US - Singapore UB - Hong Kong UP - Korea UT - Taiwan UW - Brazil,Mexico,Peru UY - Argentina UX-G3 Area suffix UX-G4 A - Australia US - Sin

5、gapore UB - Hong Kong UT - Taiwan UW - Brazil,Mexico,Peru RadioFans.CN 收音机爱 好者资料库 1-2 (No.MB429) SPECIFICATION Design and specifications are subject to change without notice. Amplifier Section Output Power25 W per channel, min. RMS, driven into 4 at 1 kHz with no more than 10% total harmonic distort

6、ion (IEC268-3). Audio input sensitivity/Impedance (at 1 kHz) AUX: 500 mV/50 k Speakers Impedance4 - 16 TunerFM tuning range50 kHz intervals87.50 MHz-108.00 MHz 100 kHz intervals87.5 MHz-108.0 MHz AM tuning range9 kHz intervals531 kHz-1 710 kHz 10 kHz intervals530 kHz-1 710 kHz CD playerDynamic range

7、85 dB Signal-to-noise ratio85 dB Wow and flutterImmeasurable Cassette deckWow and flutter100 Hz - 10 000 Hz Wow and flutter0.35% (WRMS) GeneralPower requirementAC 110 V-127 V / AC 220 V-240 V (adjustable with the voltage selec- tor), 50Hz / 60Hz Power consumption52 W (at operation) 3.0 W (on standby

8、) Dimensions (W/H/D) (approx.)152 mm 233 mm 331 mm Mass (approx.)4.7 kg Speaker Section TypeFull range, bass-reflex type Speakers10 cm cone 1 Power handling capacity25 W Impedance4 Frequency range100 Hz - 15 kHz Dimensions (W/H/D) (approx.)152 mm 233 mm 188 mm Mass (approx.)1.8 kg each RadioFans.CN

9、收音机爱 好者资料库 (No.MB429)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 t

10、he manufacturer. 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

11、alterations 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

12、- tics are often 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- v

13、ice Manual. 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 Lis

14、t of Service 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

15、hazard. When 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

16、 parts of the 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 outl

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

18、the AC line 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

19、resistor with 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 m

20、ust not exceed 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 mus

21、t be made in 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 cha

22、ssis. Therefore, 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 ( ),

23、 diode ( ) and 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

24、part. AC VOLTMETER (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.MB429) SECTION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS. (No.MB429)1-5 SECTION 3 DISASSEMBLY 3.1Main body 3.1.1Removing

25、the front panel assembly (See Fig.1 to 6) (1) From the back of the body, remove the two screws A, the two screws B and the two screws D attaching the front pan- el assembly. (2) Remove the six screws E on both sides of the body. (3) Remove the screw F on the bottom of the body. (4) Move the front pa

26、nel assembly in the direction of the arrow and remove. Disconnect the wire from connector CN102, CN402, CON801 on the main board. Caution: When reassembling the front panel assembly, fit the right and left joints a to the notch. Fig.1 Fig.2 CD mechanism assembly Rear cover assembly B A D Front panel

27、h assembly CD mechanism assembly Rear cover assembly E 1-6 (No.MB429) Fig.3 Fig.4 Fig.5 Fig.6 Front panelh assembly CD mechanism assembly Rear panel assembly E Front panel assembly Rear panel assembly F CD mechanism assembly Front panel assembly Rear cover assembly Joint a CD mechanism assembly Fron

28、t panel assembly Main board Rear cover assembly CN102 CN402 CON801 (No.MB429)1-7 3.1.2Removing the main board (See Fig.7, 8) Prior to performing the following procedure, remove the front panel assembly. (1) Disconnect the wire from all connectors on the main board. (2) Disconnect the wire from the t

29、wo connectors on the cas- sette mechanism assembly. (3) Release the two bands attaching the wire to the main board. (4) Remove the two screws G from the front panel assembly. Release the joint b. Fig.7 Fig.8 CD mechanism assembly CD mechanism assembly Front panel assembly CN203 CN481 Main board CN30

30、3 CN602 CN301 CN401 CN102 CN603 CN103 Main board Band CD mechanism assembly Front panel assembly Joint b G 1-8 (No.MB429) 3.1.3Removing the CD mechanism assembly (See Fig.9, 10) Prior to performing the following procedure, remove the front panel assembly and the main board. (1) Remove the three band

31、s attaching the wire. (2) Disconnect the connector from the CD door switch. Discon- nect the wire from connector CN603 and CN606 on the CD mechanism board. (3) Disconnect the wire soldered on the CD mechanism board. (4) Remove the three screws H attaching the CD mechanism assembly. (5) Release the j

32、oints d to remove the CD mechanism assem- bly from the front panel assembly. Fig.9 Fig.10 CD mechanism assembly CD door switch CD mechanism board Front panel assembly CN603 CN606 Band Band Band H H H CD mechanism assembly Front panel assembly Joint d Joint d CN603,CN606 band wire (No.MB429)1-9 3.1.4

33、Removing the CD mechanism assembly (See Fig.11 to 13) Prior to performing the following procedure, remove the front panel assembly, the main board and the CD mechanism as- sembly. Caution: Before disconnecting the card wire from connector CN601 on the CD mechanism board and from CD pickup board, sol

34、der the short-circuit point on the CD pickup board. If you do not fol- low this instruction, the pickup may be damaged. (1) Disconnect the wire from connector on the CD motor board. (2) Remove the four screws J attaching the CD mechanism board. (3) Move the CD mechanism board temporarily as shown in

35、 Fig.12. (4) Remove the screw K attaching the wire to the CD mecha- nism. (5) Solder the short-circuit point on the CD pickup board. (6) Disconnect the card wire from connector CN601 on the CD mechanism board. Caution: Make sure to unsolder the short-circuit point after reconnecting the card wire to

36、 the CD pickup board and to connector CN601 on the CD mechanism board. Fig.11 Fig.12 Fig.13 CD mechanism assembly CD mechanism board CN601 Wire J J CD mechanism assembly CD motor board CD mechanism board wire Cord wire CN601 Short-circuit point K Short-circuit point Card wire Unsolder CD pickup boar

37、d 1-10 (No.MB429) 3.1.5Removing the CD mechanism (See Fig.14) Prior to performing the following procedure, remove the front panel assembly, the main board, the CD mechanism assembly and the CD mechanism board. (1) Remove the four screws M attaching the CD mechanism. Fig.14 3.1.6Removing the headphon

38、e board/ AUX board (See Fig.15) Prior to performing the following procedure, remove the front panel assembly, the main board and the CD mechanism as- sembly. (1) Remove the screw N attaching the headphone board. (2) Remove the screw P attaching the AUX board. Fig.15 CD mechanism assembly CD mechanis

39、m M M Front panel assembly AUX board Head phones board PN (No.MB429)1-11 3.1.7Remove the LCD board (See Fig.16, 17) Prior to performing the following procedure, remove the front panel assembly, the main board and the CD mechanism as- sembly. (1) From the front panel, pull out the volume knob and rem

40、ove the nut and the washer. (2) Remove the twelve screws Q attaching the LCD board. Fig.16 Fig.17 Front panel assembly Washer Volume konb Nut Front panel assembly LCD board Q Q Q Q 1-12 (No.MB429) 3.1.8Removing the cassette mechanism assembly (See Fig.18, 19) Prior to performing the following proced

41、ure, remove the front panel assembly and the main board. (1) Push PUSH OPEN on the front panel to open the cassette door. (2) Remove the screw R attaching the bracket of the cassette mechanism assembly. (3) Remove the two screws T and the two screws U attaching the cassette mechanism assembly. Fig.1

42、8 Fig.19 Front panel assembly Cassette door PUSH OPEN Cassette mechaanism assembly Front panel assembly Bracket TT UU R (No.MB429)1-13 3.1.9Removing the heat sink/power board (See Fig.20 to 25) Prior to performing the following procedure, remove the front panel assembly. (1) Remove the four screws Y

43、 attaching the holder in the pow- er unit section. (2) Move the power unit section with the wire from the rear cov- er temporarily. If necessary, release the band and unsolder the wire on the power board. (3) Remove the four screws A and the two screws B attach- ing the holder. (4) Remove the three

44、bands on the wire extending from the power board (part e). Move the holder in the direction of the arrow to detach from the joint f. (5) Remove the four screws D and screw E attaching the heat sink. Fig.20 Fig.21 Rear cover YY YY Power trnsfomer assembly Power unit section Rear cover Power unit sect

45、ion 1-14 (No.MB429) Fig.22 Fig.23 Fig.24 Fig.25 Holder A A Power board e Band e Band Heat sink Holder B Power board e Band Heat sink B Joint f D E Heat sink Power board D D Heat sink Power board (No.MB429)1-15 3.1.10 Removing the power transformer assembly (See Fig.26, 27) Prior to performing the fo

46、llowing procedure, remove the front panel assembly and the power unit section. (1) Remove the four screws F attaching the power transform- er assembly. The bracket comes off at the bottom of the rear cover. (2) Remove the screw G attaching the power cord folder. (3) Remove the two screws H attaching

47、 the AC connect board. 3.1.11 Removing the FM-ANT board (See Fig.26, 27) Prior to performing the following procedure, remove the front panel assembly and the power unit section. (1) Remove the screw J on the rear cover assembly. (2) Unsolder the FM-ANT wire on the FM-ANT board. Fig.26 Fig.27 Rear co

48、ver F F Power trnsfomer assembly Rear cover FM-ANT board G H H Power cord folder AC connect board J 1-16 (No.MB429) SECTION 4 ADJUSTMENT 4.1Measuring instructions required for adjustment AM signal generator FM signal generator Inter medicate frequency sweep generator FM stereo signal generator Low-f

49、requensy oscillator (osillation frequency 50 Hz - 20 kHz, 0 dB output with 600 impedance) Attenuator (600 impedance) Electoronic voltmeter Distortion meter Torque gauge (cassette for CTG-N) Wow & flutter meter Frequency counter meter 4.2Test tape Playback tape VT712 (tape speed, wow flutter) VT724 (