JVC-RX7520VBK-avr-sm 维修电路原理图.pdf

SERVICE MANUALAUDIO/VIDEO CONTROL RECEIVERNo.21097Apr. 2002COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.RX-7520VBKRX-7520VBKContentsSafety precautions -1-2Importance administering point on the safety - 1-3Disassembly method -1-4Adjustment method -1-9Description of major ICs -1-1024 Area suffixC - CanadaDVDVCRTV SOUNDADJUSTRX-7520VAUDIO/VIDEO CONTROL RECEIVERSETTINGMASTER VOLUMECONTROLDOWNUPCDTAPE/CDRSOURCE NAMEBASS BOOSTINPUT ANALOG/DIGITALSPEAKERS ON/OFFSURROUND MODEPHONESSURROUND ON/OFFFM/AM TUNINGSTANDBYSTANDBY/ONFM/AM PRESETFM MODEMEMORYINPUT ATTAMDVD MULTIFM12COMPULINKRemoteFM MODERadioFans.CN 收音机爱 好者资料库RX-7520VBK1-21. This design of this product contains special hardware and many circuits and components specially for safety purposes. For continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. Services should be performed 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 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 characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in the Parts List of Service 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 characteristics as the recommended replacement parts shown in the Parts List 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 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 re-assembling.5. Leakage currnet check (Electrical shock hazard testing)After re-assembling the product, always perform an isolation check on the exposed metal parts of the product (antenna 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 Leakage Current Tester, measure the leakage current from each exposed metal parts of the cabinet, particularly any exposed metal part having a return path to the chassis, to a known good earth ground. Any leakage current must not exceed 0.5mA AC (r.m.s.).Alternate check methodPlug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 ohms per volt or more sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by a 0.15 F AC-type capacitor between an exposed metal part and a known good earth ground.Measure the AC voltage across the 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 meausre the AC voltage across the resistor. Now, reverse the plug in the AC outlet and repeat each measurement. Voltage measured any must not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.). 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 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.Good earth groundPlace this probe on each exposedmetal part.AC VOLTMETER(Having 1000 ohms/volts,or more sensitivity)1500 10W0.15 F AC TYPE!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.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.)RadioFans.CN 收音机爱 好者资料库RX-7520VBK1-3Caution: For continued protection against risk offire, replace only with same type 6.3A/125V forF201, 2A/125V for F202 and F203.This symbol specifies type of fast operating fuse.Precaution: Pour eviter risques de feux, remplacezle fusible de surete de F201 comme le meme typeque 6.3A/125V, et 2A/125V pour F202 et F203.Ce sont des fusibles suretes qui functionnes rapide.Importance administering point on the safety Secondary partsPrimary partFC211FC212R1EP1B106B105B104TA201TA202PW104PW102PW105PW103PW101B103B102B101B108B107B109B110CN251D205FC221FC222FC231FC232R201RY201110111112113114120121122130131B192B191B160B1596.3A-125V2A-125V2A-125VF 201F 203F 202LVA1029-C9LVA1029-C76.3A-125VRX-7520VBK1-4Remove the four screws A attaching the top cover on both sides of the body.Remove the three screws B on the back of the body.Remove the top cover from behind in the direction ofthe arrow while pulling both sides outward.1.2.3.Disassembly methodRemoving the top cover (See Fig.1)Prior to performing the following procedure, removethe top cover.Remove the power cord stopper from the rear panelby moving it in the direction of the arrow.Remove the twenty-six screws E attaching the eachboards to the rear panel on the back of the body.Remove the four screws F attaching the rear panelon the back of the body.1.2.3.Removing the rear panel (See Fig.4)Prior to performing the following procedure, removethe top cover.Disconnect the card wire from connector CN402 onthe audio board and CN201 on the power supplyboard in the front panel assembly.Cut off the tie band fixing the harness.Remove the three screws C attaching the front panelassembly.Remove the four screws D attaching the front panelassembly on the bottom of the body. Detach the frontpanel assembly toward the front.1.2.3.4.Removing the front panel assembly(See Fig.2 and 3)Fig.1Fig.2Fig.3Fig.4A 2A 2BTop coverCPower supplyboardAudio boardCN402Main boardTie bandDEEFEFFCord stopperCFront panel assemblyFront panel assemblyDRear panelCN201EEEEERX-7520VBK1-5Prior to performing the following procedure, remove the top cover and the rear panel.Cut off the tie band fixing the harness.Disconnect the DSP board from connector CN481 onthe audio board.Disconnect theComponent video board fromconnector CN511 on the S video board.Disconnect the audio input board, DVD board Videoboard and the S video board from connector CN421,CN431, CN441 and CN461 on the audio board.Disconnect the tuner board from connector CN411 on the audio board.1.2.3.4.5.Removing each board connected to therear side of the audio board(See Fig.5 to 9)Fig.5Fig.6Fig.7Fig.8CN411Tie bandDSP boardDVD boardVideo boardTuner boardAudioinput board boardDSP boardCN481CN441CN431CN421CN481CN421CN431CN441CN411Tie bandCN421CN431CN441Audioinput board boardDVD boardVideo boardTuner boardAudio boardCN461S Video boardCN461S Video boardComponent video boardCN511Fig.9Component video boardCN511RX-7520VBK1-6Prior to performing the following procedure, removethe top cover and the rear panel.Removing the audio board (See Fig.10)Disconnect the card wire from connector CN402 onthe audio board.Disconnect the relay board from the audio board andthe power supply board. (CN291, CN491)Disconnect the harness from connector CN471,CN472, CN473.Remove the three screws G attaching the audioboard assembly.Remove the screw H attaching the audio boardassembly.1.2.3.4.5.Removing the Heat sink (See Fig.12 to 14)Prior to performing the following procedure, removethe top cover, the rear panel and audio board.Disconnect the harness from connector CN241 andCN203 on the power supply board respectively.Disconnect the harness from connector CN251 onthe power transformer board .Remove the four screws I and the two screws Jattaching the main board.1.2.3.Removing the main board (See Fig.11)Prior to performing the following procedure, removethe top cover and main board.Remove the two screws K attaching the heat sink tothe reverse side of main board.Disconnect the for connectors with each amp. board,and remove the main board.Remove the four screws M and ten screws Lattaching the heat sink.1.2.3.Fig.10Fig.13Fig.11Fig.12powersupplysupply boardyboardyPower / FuseboardRelay boardCN473Audio boardMain board rear sideMain boardHeat sink CN291CN203CN491HGCN471CN402CN472PowertransformerGGCN241IIIIJJLLKKMMCN251LFig.14Main boardRear Rch amp. boardFront Lch amp. boardFront Rch amp. boardCenter amp. boardRear Lch amp. boardHeat sink CN802CN801CN302CN301CN901RX-7520VBK1-7Prior to performing the following procedure, removethe top cover and the rear panel.Remove the screw O attaching the power / fuseboard.Unsolder the power cord and other harnessesconnected to the power / fuse board.1.2.Removing the power / fuse board(See Fig.15)Prior to performing the following procedures, removethe top cover.Cut off the tie band fixing the harness.Unsolder the two harnesses connected to the powertransformer.Unsolder the harness connected to the FW201 onthe power transformer board.Remove the four screws N attaching the powertransformer.1.2.3.4.Removing the power transformer(See Fig.15)Prior to performing the following procedure, removethe top cover and the front panel.Remove the one nut attaching the headphone jack ofthe power supply board on the front side of the body.Disconnect the harness connected to connectorCN241, CN201, CN203, and CN291 on the powersupply board (If necessary, cut off the band fixing theharness on the side of the base chassis).Remove the three screws P attaching the powersupply board and pull out the power supply boardfrom the front bracket backward.Unsolder the three harnesses connected to thepower supply board.1.2.3.4.Removing the power supply board(See Fig.16 , 17)Fig.15Fig.16Fig.17PowersupplyboardyboardyPowerransformerNCN241SolderpointsNSolderpointsSolderpointsOPower / fuse boardPower cordPowersupplyboardNuthone jackHeadphone jackTie bandSolder pointsPPPSolderpointsCN201CN291HookPowertransformerboardFW201CN203RX-7520VBK1-8Prior to performing the following procedure, removethe top cover and the front panel assembly.Pull out the volume knob on the front side of the frontpanel and remove the nut attaching the systemcontrol board.Remove the two screws Q attaching the powerswitch board.Disconnect the harness from connector CN714 onthe power switch board.Remove the six screws R attaching the systemcontrol board on the back of the front panel.On the back of the front panel, release the six jointsby pushing the joint tabs inward.Remove the operation switch panel toward the front.Release the two hook attaching the system controlboard.1.2.3.4.5.6.Removing the system control board / power switch board (See Fig.18 to 20)Fig.18Fig.19Fig.20Front panel assemblyVolume knobSystem control boardPower switch boardRRCN714QJointJointJointJointJointJointHookHookOperation switch panelRX-7520VBK1-9Adjustment method1. Set the volume control to minimum during this adjustment. (No signal & No load)2. Set the surround mode OFF.3. Turn VR301 and VR302 fully counterclockwise to warm up before adjustment. If the heat sink is already warm from previous use the correct adjustment can not be made.4. For L-ch, connect a DC voltmeter between TP301s B216 and B217 (Lch) and, connect it between TP302s B218 and B219 (Rch).5. 30 seconds later after power on, adjust VR301 for L-ch, or VR302 for R-ch so that the DC voltmeter value has 2.0mV.1. Tuner range FM 87.5MHz108.0MHz AM (MW) 530kHz1710kHzTuner sectionPower amplifier sectionTP302 (Rch)VR301 (Lch)VR302 (Rch)Heat sinkAdjustment of idling currentMeasurement location TP301 (Lch) , TP302 (Rch) Adjustment part VR301 (Lch) , VR302 (Rch)AttentionThis adjustment does not obtain a correct adjustment value immediately after the amplifier isused (state that an internal temperature has risen). Please adjust immediately after using the amplifier after turning off the power supply of theamplifier and falling an internal temperature. * It is not abnormal though the idling current might not become 0mA even if it is finished to turn variable resistance (VR301, VR302) in the direction of counterclockwise. TP301 (Lch)RX-7520VBK1-10 1 2 3 4 5 6 7 8 910113332313029282726252423121314151617181920212244434241403938373635341.Pin layoutAK4527BVQP (IC601) : A/D,D/A converterTop ViewNo. 1 2 3 4 5 6 7 8 9101112131415161718SymbolSDOSOSKSMISBICKLRCKSDTI1SDTI2SDTI3SDTOD,AUXDFSDEMIDEMOMCKODVDDDVSSPDXTSSDTO Source Select Pin (Note 1) L : Internal ADC output, H : DAUX input Control Mode Select Pin L : 3-wire Serial, H : I2C BusSoft Mute Pin (Note 1), Connect to GND When this pin goes to H, soft mute cycle is initialized. When returning to L, the output mute releases.Audio Serial Data Clock PinInput Channel Clock PinDAC1 Audio Serial Data Input PinDAC2 Audio Serial Data Input PinDAC3 Audio Serial Data Input PinAudio Serial Data Output PinSub Audio Serial Data Input Pin, Connect to GNDDouble Speed Sampling Mode Pin (Note 1) L : Normal Speed, H : Double SpeedConnect to GND No internal bonding.Zero Input Detect Enable Pin, Connect to GND L : mode 7 (disable) at parallel mode, zero detect mode is selectable by DZFM2-0 bits at serial mode.H : mode 0 (DZF is AND of all six channels)Output Buffer Power supply Pin, 2.7V5.5VDigital Power Supply Pin, 4.5V5.5VDe-emphasis Pin, 0VPower-Down & Reset Pin When L, the AK4527B is powered-down and the control registers are reset to default state. If the state of P/S or CAD0-1 changes, then the AK4527B must be reset by PDN.Test Pin, Connect to GND This pin should be connected to DVSS.FunctionI/OII-II/OIIIO-I-I-2. Pin function (1/2)Description of major ICsRX-7520VBK1-11No.192021222324252627282930 31 32333435363738394041424344SymbolICKSADIFCAD1CAD0 LOUT3ROUT3LOUT2ROUT2LOUT1ROUT1LIN-LIN+RIN-RIN+VREFLOVFVCOMVREFHAVDDAVSSXTIXTOP1SCSCSNDIF1SCL/CCLKLOOP0SAD/CDTICDTDConnect to GND No internal bonding.Analog Input Format Select Pin, Digital Power SupplyH : Full-differential input, L : Single-ended inputChip Address 1 Pin, Connect to GNDChip Address 0 Pin, Connect to GNDDAC3 Lch Analog Ou