Jvc-UXGD-7-Service-Manual电路原理图.pdf

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1、SERVICE MANUALCOPYRIGHT 2005 Victor Company of Japan, LimitedNo.MB4222005/8MICRO COMPONENT SYSYTEMMB42220058UX-GD7Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)TABLE OF CONTENTS1 PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-53 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-64 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-175 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . .

4、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17CA-UXGD7 SP-UXGD7SP-UXGD7Area suffixB - U.K.E - Continental EuropeEN - Northern EuropeEV - Eastern EuropeEE - Russian Federation1-2 (No.MB422)SPECIFICATIONDesign and specifications are subject to change withou

5、t notice.Amplifier section Output power 140 W (70 W + 70 W) at 6(10% THD)Analog input AUX Sensitivity/Impedance (at 1 kHz): 400 mV/47 kUSB input USB Ver.1.1Digital output OPTICAL DIGITAL OUT -21 dBm to -15 dBm (660 nm 30 nm)VIDEO OUT Color system PALVideo (composite) 1 V(p-p)/75S-video Y (luminance)

6、: 1 V(p-p)/75C (chrominance, burst): 0.3 V(p-p)/75RGB 0.7 V(p-p)/75COMPONENT (Y): 1 V(p-p)/75(PB/PR): 0.7 V(p-p)/75Speaker terminals Impedance 6- 16Tuner section FM tuning range 87.50 MHz - 108.00 MHzAM tuning range 522 kHz - 1 629 kHzDisc player section Playable disc DVD Video/DVD AudioCD/VCD/SVCDC

7、D-R/CD-RW (recorded in Audio CD/Video CD/Super Video CD/MP3/JPEG/DivX format)DVD-R (recorded in video/MP3/JPEG/DivX format)DVD-RW/DVD-RAM (recorded in video/DVD-VR/MP3/JPEG/DivXformat)Horizontal resolution 500 linesWow and flutter ImmeasurableGeneral Power requirement AC 230 V , 50 HzPower consumpti

8、on 150 W (at operation)1.3 W (on standby)Dimensions (approx.) 189 mm 224 mm 406 mm(W/H/D)Mass (approx.) 6.5 kgSpeakers Type 2-way Bass-reflex type, Magnetically shieldedSpeaker systems Woofer 12 cm cone 1Tweeter 4 cm cone 1Power handling capacity 70 WImpedance 6Frequency range 45 Hz - 20 000 HzSound

9、 pressure level 84 dB/WmDimensions (approx.) 165 mm 286 mm 237 mm(W/H/D)Mass (approx.) 2.8 kg each(No.MB422)1-3SECTION 1PRECAUTIONS1.1 Safety Precautions(1) This design of this product contains special hardware andmany circuits and components specially for safety purpos-es. For continued protection,

10、 no changes should be madeto the original design unless authorized in writing by themanufacturer. Replacement parts must be identical tothose used in the original circuits. Services should be per-formed by qualified personnel only.(2) Alterations of the design or circuitry of the product shouldnot b

11、e made. Any design alterations of the product shouldnot be made. Any design alterations or additions will voidthe manufacturers warranty and will further relieve themanufacture of responsibility for personal injury or propertydamage resulting therefrom.(3) Many electrical and mechanical parts in the

12、 products havespecial safety-related characteristics. These characteris-tics are often not evident from visual inspection nor can theprotection afforded by them necessarily be obtained by us-ing replacement components rated for higher voltage, watt-age, etc. Replacement parts which have these specia

13、lsafety characteristics are identified in the Parts List of Ser-vice Manual. Electrical components having such featuresare identified by shading on the schematics and by ( ) onthe Parts List in the Service Manual. The use of a substitutereplacement which does not have the same safety charac-teristic

14、s as the recommended replacement parts shown inthe Parts List of Service Manual may create shock, fire, orother hazards.(4) The leads in the products are routed and dressed with ties,clamps, tubings, barriers and the like to be separated fromlive parts, high temperature parts, moving parts and/orsha

15、rp edges for the prevention of electric shock and firehazard. When service is required, the original lead routingand dress should be observed, and it should be confirmedthat they have been returned to normal, after reassem-bling.(5) Leakage shock hazard testingAfter reassembling the product, always

16、perform an isola-tion check on the exposed metal parts of the product (an-tenna terminals, knobs, metal cabinet, screw heads,headphone jack, control shafts, etc.) to be sure the productis safe to operate without danger of electrical shock.Do notuse a line isolation transformer during this check. Plu

17、g the AC line cord directly into the AC outlet. Using a“Leakage Current Tester“, measure the leakage currentfrom each exposed metal parts of the cabinet, particular-ly any exposed metal part having a return path to thechassis, to a known good earth ground. Any leakage cur-rent must not exceed 0.5mA

18、AC (r.m.s.). Alternate check methodPlug the AC line cord directly into the AC outlet. Use anAC voltmeter having, 1,000 per volt or more sensitivityin the following manner. Connect a 1,500 10W resistorparalleled by a 0.15F AC-type capacitor between anexposed metal part and a known good earth ground.M

19、easure the AC voltage across the resistor with the ACvoltmeter. Move the resistor connection to each exposed metalpart, particularly any exposed metal part having a returnpath to the chassis, and measure the AC voltage acrossthe resistor. Now, reverse the plug in the AC outlet andrepeat each measure

20、ment. Voltage measured any mustnot exceed 0.75 V AC (r.m.s.). This corresponds to 0.5mA AC (r.m.s.). 1.2 Warning(1) This equipment has been designed and manufactured tomeet international safety standards.(2) It is the legal responsibility of the repairer to ensure thatthese safety standards are main

21、tained.(3) Repairs must be made in accordance with the relevantsafety standards.(4) It is essential that safety critical components are replacedby approved parts.(5) If mains voltage selector is provided, check setting for localvoltage.1.3 CautionBurrs formed during molding may be left over on some

22、partsof the chassis. Therefore, pay attention to such burrs in the case of pre-forming repair of this system.1.4 Critical parts for safetyIn regard with component parts appearing on the silk-screenprinted side (parts side) of the PWB diagrams, the parts that areprinted over with black such as the re

23、sistor ( ), diode ( )and ICP ( ) or identified by the “ “ mark nearby are criticalfor safety. When replacing them, be sure to use the parts of thesame type and rating as specified by the manufacturer. (This regulation dose not Except the J and C version)Good earth groundPlace this probe on each expo

24、sedmetal part.AC VOLTMETER(Having 1000 ohms/volts,or more sensitivity)1500 10W0.15 F AC TYPE1-4 (No.MB422)1.5 Safety Precautions (U.K only)(1) This design of this product contains special hardware and many circuits and components specially for safety purposes. For con-tinued protection, no changes s

25、hould be made to the original design unless authorized in writing by the manufacturer. Replace-ment parts must be identical to those used in the original circuits.(2) Any unauthorised design alterations or additions will void the manufacturers guarantee; furthermore the manufacturer cannotaccept res

26、ponsibility for personal injury or property damage resulting therefrom.(3) Essential safety critical components are identified by ( ) on the Parts List and by shading on the schematics, and must neverbe replaced by parts other than those listed in the manual. Please note however that many electrical

27、 and mechanical parts inthe product have special safety related characteristics. These characteristics are often not evident from visual inspection. Partsother than specified by the manufacturer may not have the same safety characteristics as the recommended replacement partsshown in the Parts List

28、of the Service Manual and 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 f

29、ire hazard. When service isrequired, the original lead routing and dress should be observed, and it should be confirmed that they have been returned tonormal, after re-assembling.1.5.1 Warning(1) Service should be performed by qualified personnel only.(2) This equipment has been designed and manufac

30、tured to meet international safety standards.(3) It is the legal responsibility of the repairer to ensure that these safety standards are maintained.(4) Repairs must be made in accordance with the relevant safety standards.(5) It is essential that safety critical components are replaced by approved

31、parts.(6) If mains voltage selector is provided, check setting for local voltage.Burrs formed during molding may be left over on some parts of the chassis. Therefore, pay attention to such burrs in the case of preforming repair of this system.(No.MB422)1-5SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis s

32、ervice manual does not describe SPECIFIC SERVICE INSTRUCTIONS.1-6 (No.MB422)SECTION 3DISASSEMBLY3.1 Disassembly of the main blocks of the setReplacement of the fuses and the power IC.3.1.1 Replacing the fuses (See Fig. C) Prior to performing the following procedure, remove the rearcover.(1) Replace

33、the fuses inside.Caution:Be sure to use fuses with the specified ratings.Fig.C3.1.2 Replacing the power IC (See Fig. D) Prior to performing the following procedure, remove the rearcover.(1) Remove the two screws H from the heat sink between thepower IC.(2) Remove the solder fixing the power IC.Fig.D

34、FUSE(Location:F901)Value: T1.25AL 250VH(No.MB422)1-73.2 MAIN BODY3.2.1 Removing the Metal Side Left and the Metal Side Right (See Fig. 1-1, Fig. 1-2 and Fig. 1-3)(1) Unscrew the 10 screws A from the Rear Panel, the TopCover and the Chassis Main.(2) Remove the Metal Side Left and the Metal Side Right

35、.Fig.1-1Fig.1-2Fig.1-3AAA1-8 (No.MB422)3.2.2 Removing the Top Cover (See Fig. 2-1, Fig. 2-2 and Fig. 2-3)(1) Unscrew the 2 Screws B and 2 Screws C.(2) Removing the Top Cover.Fig.2-1Fig.2-2Fig.2-3BBC(No.MB422)1-93.2.3 Removing the Cabinet Front (See Fig. 3-1, Fig. 3-2, Fig. 3-3 and Fig. 3-4)(1) Unscrew the 3 Screws D from the Chassis Main.(2) Pulling out the 3 cable connectors from the Main Board unitand the AMP Board unit then removing the Cabinet Front.Fig.3-1Fig.3-2Fig.3-3Fig.3-4DDDConnectorConnectorConnector