JVC-UXG5-cs-sm 维修电路原理图.pdf

SERVICE MANUALCOPYRIGHT 2005 Victor Company of Japan, LimitedNo.MB4312005/8MICRO COMPONENT SYSTEMMB43120058UX-G5Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)TABLE OF CONTENTS1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-43DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-54ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-155TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18CA-UXG5SP-UXG5SP-UXG5Area suffixA - AustraliaUS - SingaporeUP - KoreaUT - TaiwanUW - Brazil,Mexico,PeruUY - ArgentinaUJ - U.S.MilitaryRadioFans.CN 收音机爱 好者资料库1-2 (No.MB431)SPECIFICATIONDesign and specifications are subject to change without notice.Amplifier sectionOutput Power100 W (50 W+50 W) at 6 (10% THD)Speakers Impedance6 - 16 Audio Input AUX400 mV/50 kTuner sectionFM tuning range87.50 MHz - 108.00 MHzAM tuning range531 kHz - 1 710 kHz (at 9 kHz)530 kHz - 1 710 kHz (at 10 kHz)CD player sectionDynamic range85 dBSignal-to-noise ratio85 dBWow and flutterImmeasurableCassette deck section Frequency response: Normal (type l) 60 Hz - 14 000 HzWow and flutter0.15% (WRMS)GeneralPower requirementAC 110 V - 127 V / 220 V - 240 V (adjustable with the voltage selector), 50 Hz/60 HzPower consumption90 W (at operation)0.8 W (on standby)Dimensions (approx.)175 mm 232 mm 412 mm (W/H/D)Mass (approx.)6.6 kgSpeakersType2-way Bass reflexSpeaker unitsWoofer10 cm cone 1Tweeter4 cm cone 1Impedance6 Dimensions (approx.)144 mm 231 mm 201 mm (W/H/D)Mass (approx.)2.0 kg eachRadioFans.CN 收音机爱 好者资料库(No.MB431)1-3SECTION 1PRECAUTION1.1Safety Precautions(1) This design of this product contains special hardware andmany circuits and components specially for safety purpos-es. For continued protection, 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 be 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 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 specialsafety 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-teristics 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/orsharp 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 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. Plug the AC line cord directly into the AC outlet. Using aLeakage 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 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 an ex-posed metal part and a known good earth ground.Measure 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 measurement. Voltage measured any mustnot exceed 0.75 V AC (r.m.s.). This corresponds to 0.5mA AC (r.m.s.). 1.2Warning(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 maintained.(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.1.3CautionBurrs formed during molding may be left over on some partsof the chassis. Therefore, pay attention to such burrs in the case of pre-forming repair of this system.1.4Critical 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 resistor ( ), 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 exposedmetal part.AC VOLTMETER(Having 1000 ohms/volts,or more sensitivity)1500 10W0.15 F AC TYPE1-4 (No.MB431)SECTION 2SPECIFIC SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.(No.MB431)1-5SECTION 3DISASSEMBLY3.1Disassembly of Right plate left plate Top coverReplacement of the fuses and AMP TR .THMS RES. Transistor. 7808 IC.3.1.1Replacing the fuses (See Fig.1) Prior to performing the following procedure, remover rightplate, left plate, top cover.(1) Replace the fuses inside.Caution:Be sure to use fuses with the specifiedFig.13.1.2Replacing the AMP TR (See Fig.2) Prior to performing the following procedure, remove the rightplate, left plate, top cover.(1) Remove the four screws A from the heat sink betweenAMP TR four.(2) Remove the solder fixing the AMP TR.3.1.3Replacing the THMS RES (See Fig.2) Prior to performing the following procedure, remove right plate,left plate, top cover.(1) Remove the one screw B from heat sink.(2) Remove the solder fixing THMS RES.Fig.23.1.4Replacing the 7808 IC (See Fig.3)(1) Remove the two screws D from heat sink.(2) Remove the solder fixing transistor.Fig.3FUSEA B(TR)THMS RESD1-6 (No.MB431)3.1.5Removing the transformer cover (See Fig.4)(1) Remove the ten screws E from top cover.(2) Take off transformer cover from rear plate.Fig.43.1.6Removing the Right plate (See Fig.5)(1) Remove the two screws F.(2) Take off right plate from main body.Fig.53.1.7Removing the Left plate (See Fig.6)(1) Remove the two screws G.(2) Take off left plate from main body.Fig.6SPEAKERS IMPEDANCE:6 16EETransformercoverEEFRight plateGLeft plate(No.MB431)1-73.1.8Removing the TOP COVER (See Fig.7 to 9)(1) Remove the two screws H1 (See Fig.7, 8).(2) Disengage the claws H2 on both side of the front cabinet(See Fig.7, 8).(3) Rotate top cover and lets away from main body (SeeFig.9).Caution:When you rotate top cover, must to slow raise, Dont to destroythe two claws of front cabinet.Fig.7Fig.8Fig.9H1Top coverH2H1H21-8 (No.MB431)3.1.9Removing the main board (See Fig.10 to 13)(1) Remove the two screws J1. (See Fig.10)(2) Disconnect the FFC cable J2 from the connector CN661 onmain board. (See Fig.10)(3) Disconnect the FFC cable J3 from the connector CN402 onmain board. (See Fig.11)(4) Disconnect the FFC cable J4 from the connector CN681 onmain board. (See Fig.12)(5) Remove main board from AMP board after disconnect theconnector J319 and CN601. (See Fig.13)Fig.10Fig.11Fig.12Fig.13J1J1J2J3J4J5(No.MB431)1-93.1.10 Removing the Power board (See Fig.14 to 16)(1) Remove the two screws K1 from CD MECH cover andpower board. (See Fig.14)(2) Remove the two screws K1 from rear plate and powerboard. (See Fig.14-1)(3) Disconnect the wire K2 from the connector CN102 on theAMP board. (See Fig.15)(4) Disconnect the two wire K3 from the connector CN901 andCN902. (See Fig.16)Fig.14Fig.14-1Fig.15Fig.16Power boardK1k1K2K31-10 (No.MB431)3.1.11 Removing the Rear plate assembly (See Fig.17 to 18)(1) Disengage the claws I1 on both sides of bottom plate. (SeeFig.17)(2) Disconnect the wire I2 from the connector CN105 on theAMP board. (See Fig.18)Fig.17Fig.183.1.12 Removing the fan (See Fig.19)(1) Removing the four screws M2.3.1.13 Removing the Tuner pack (See Fig.19)(1) Removing the two screws M1.Fig.19I1Rear plate assemblyI2M1M2M2FanM2M2M1Tuner pack(No.MB431)1-113.1.14 Removing the cassette machine from top cover (See Fig.20 to 22)(1) Disconnect the wire E1 from connector of the cassette ma-chine. (See Fig.20)(2) Disconnect the wire E2 from connector of the cassette ma-chine. (See Fig.21)(3) Remove the four screws E3 from top cover. (See Fig.22)(4) Take out cassette machine.Fig.20Fig.21Fig.22TOP COVERE1E2TOP COVERCASSETTEMECHAE3E3E3E3TOP COVERCASSETTEMECHA1-12 (No.MB431)3.1.15 Removing the key board (See Fig.23)(1) Remove the eight screws P from the front cabinet and thekey board.Fig.233.1.16 Removing the AUX board (See Fig.24)(1) Remove the two screws Q from the front cabinet and theaux board.3.1.17 Removing the phones board (See Fig.24)(1) Remove the two screws R from the front cabinet and thephones board.Fig.24Key boardPPPAux boardPhones boardQR(No.MB431)1-133.1.18 Removing the CD MECH COVER (See Fig.25, 26)(1) Remove the four screws S.Fig.25Fig.26CD Mech CoverSS1-14 (No.MB431)3.1.19 Removing the CD MECH Assembly (See Fig.27, 28)(1) Remove the two screws T from the CD MECH-F and CDMECHANISM assembly. (See Fig.27)(2) Remove the two screws T from the CD MECH-B and CDMECHANISM assembly. (See Fig.28)(3) Take out CD MECHANISM assembly from the CD MECH-F between the CD MECH-B.Fig.27Fig.28CD MECH AssemblyTTT(No.MB431)1-15SECTION 4ADJUSTMENT4.1Measuring instructions required for adjustment AM signal generator FM signal generator Inter medicate frequency sweep generator FM stereo signal generator Low-frequensy 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 meter4.2Test tape Playback tapeVT712 (tape speed, wow flutter)VT724 (reference level)VT703L (head azimuth)VT738 (frequency responce) Recording tapeAC225 (type I) Power supply voltageAC220V - 240V 50Hz4.3Measuring instruments Radio sectionFM : 1 kHz, 22.5kHz deviationFM stereo : 1 kHz, 67.5 kHz deviation, pilot signal 7.5 kHzAM : 1 kHz, 30% modulationReference output : 0 dB (1 V) 4 Headphone output : -10 dB (0.1V) 32 4.4Amplifier section Reference output : Speaker output 0 dB (1 V) / 4 Headphone output -10 dB (0.1 V) / 32 4.5CD section Test disc : CTS-1000 (JVC)TCD-731R (A-BEX)TCD-712R (A-BEX)TCD-785 (A-BEX)1-16 (No.MB431)4.6Cassette amplifier section4.7Tuner sectionItemMeasuring conditionCheck and adjustment procedureStandard valueAdjusting partHead azimuthadjustmentTape speedandwow/fluttercheck and adjustmentPB frequencyresponcecheckBias frequencycheckREC and PBfrequencyresponceadjustmentHead azimuthadjusting screw(to be used onlyafter head re-placement)Tape speed : motor semifixedresistorcheck onlyL203Output level :within +/-2dBof maximumoutput level2940 to 3090 Hzwithin 0.38%(unweighted)deviation between1 kHz and 8 kHz :0 (+3 to -6) dB.Level differencebetween REC andPB : within 0 (+3 to 6) dBPhase defferenceL and R channels:minimum1.Plyback the test tape VT703.2.Adjust the head azimuth adjusting screw so that the phase difference between the R and L channels is minimized at an output level that is within +/- 2dB of the maximum output level. After this adjustment, lock the head azimuth adjusting screw with screw sealant to cover more than a half of the screw head.3.When the head azimuth is maladjusted, correct it with the head azimuth adjusting screw.1.Plyback the test tape VT712 by the end of position.2.Connect a frequency counter and check that it reads between 2940 and 3090 Hz. If not, adjust the frequenct with the motor semifixed resistor.3.Check that the wow / flutter is 0.38% (unweighted).Playback the test tape VT738 while confir-ming that deviation between the 1 kHzsignal and 8 kHz signal should be 0 (+3 to -6) dB.Set the TUNER or CD function and withTAPE to record. Check to see if thefrequency at the measuring point (R335 orR336) is 60 kHz +/-1 kHz if not adjust T360until the frequency counter indicates60 kHz +/- 1 kHz.At TUNER, set the BAND to the FMposition, and record the reference 1 kHzsignal and 8 kHz signal altemately repeatedly. While playing back therecorded signal differ from that of the 1 kHzsignal by within 0 (+3 to 6) dB.Test tape : VT703Signal output terminal :PHONES(with 32 ohm load)Test tape : VT712Signal output terminal :PHONES(with 32 ohm load)Test tape : VT738Signal output terminal :PHONES(with 32 ohm load)Test tape : normalSignal output terminal :Casssette R/P headTest tape : AC225Signal input : FM 22.5dev, 60dBu withemphasisSignal output terminal :PHONES(with 32 ohm load)ItemMeasuring conditionCheck and adjustment procedureStandard valueAdjusting partAM IFadjustmentAM trackingadjustmentTuner 114 kHzfilter the wavesadjustmentT203T201T204R245TC2011.Set the intermediate frequency sweep generator to AM 450 kHz.2.Adjust the T203 from maximum and center output.1.Set the TUNER at 522 kHz adjust T201 until the test pin of R245 voltage at 1.55 V +/- 0.1 V.2.Set the TUNER at 1629 kHz, check the pin of R245 voltage at 8.4 V +/- 6V.3.Set the TUNER ang S/G at 612 kHz, adjust T202 for maximum output.4.Set the TUNER and S/G at 1404 kHz, adjust T201 for maximum output.5.Repwat the above step 3 and 4.1.Set the unit in standby mode. Input 114