Jvc-RX-7001-PGD-Service-Manual电路原理图.pdf

SERVICE MANUALAUDIO/VIDEO CONTROL RECEIVERNo.20881Oct. 2000COPYRIGHT 2000 VICTOR COMPANY OF JAPAN, LTD.RX-7001PGDAUFUSAustraliaChinaSingaporeArea SuffixContentsSafety precautions -1-2Disassembly method -1-3Adjustment method -1-9Description of major ICs -1-10+RX-7001P AUDIO/VIDEO CONTROL RECEIVERSPEAKERS12PHONESSURROUND ON/OFFDSP MODEBALANCE/SURROUNDADJUSTSEA MODESEA ADJUST SETTINGMULTI JOGMASTER VOLUMESOURCE SELECTORTHEATER LIVE CLUB DANCE CLUB HALL PAVILIONINPUTANALOG/DIGITAL FM/AM TUNING TUNER PRESETTUNER/SEA MEMORY FM MODEDVDTV SOUND/DBS PHONOTAPE/MDVCRFMAMCDSOUND SELECTINPUT ATT.BASS BOOST ONE TOUCH OPERATIONSOURCE NAMECOMPULINKRemoteSTANDBYSTANDBY/ONRM-SRX7001P REMOTE CONTROLCONTROLCHANNEL VOLUMETV VOLSTOP PAUSEFF/REWVCRTV/VIDEO TAPE/MD MUTINGRECPLAYDVD DVD MUILTI CD TAPE/MDTV/DBS PHONO FM/AMVCR ANALOG/DIGITALSURROUND CENTERSURROUND TEST REAR-LCD-DISCMODEON/OFFEFFECT REAR-RSOUND SEA MODE SUBWOOFERRETURNSETMENUAUDIO/TV/VCREXIT TEXTDISPLAYSLEEP1234567/P 8910 0 +10100+FM MODECATV/DBSMENUENTERTV/CATV/DBS VCR TUNINGDOWN UPRX-7001PGDRX-7001PGDSafety Precautions1. 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 eachexposed 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.). Warning1. 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!CAUTIONBurrs 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.1-2http:/getMANUAL.comRX-7001PGD1-3Remove 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 of the arrow while pulling both sides outward.1.2.3.Disassembly methodRemoving the top cover (See Fig.1)Prior to performing the following procedure, remove the top cover.Remove the power cord stopper from the rear panel by moving it in the direction of the arrow.Remove the twenty-eight screws E attaching the each boards to the rear panel on the back of the body.Remove the three screws F attaching the rear panel on the back of the body.1.2.3.Removing the rear panel (See Fig.4)Prior to performing the following procedure, remove the top cover.Disconnect the card wire from connector CN400 on the main board and CN402 on the power supply board in the front panel assembly.Cut off the tie band fixing the harness.Disconnect the harness from connector CN202 on the video board.Remove the three screws C attaching the front panel assembly.Remove the five screws D attaching the front panel assembly on the bottom of the body. Detach the front panel assembly toward the front.1.2.3.4.5.Removing the front panel assembly (See Fig.2 and 3)Fig.1Fig.2Fig.3Fig.4A 2A 2BTop coverCPower supply boardCN402Main boardCN400Tie bandVideo boardCN202DE 3E 3E 5E 3E 3E 2EEFEEFFCord stopperCFront panel assemblyFront panel assemblyDRear panelERX-7001PGD1-4Prior to performing the following procedure, remove the top cover and the rear panel.Cut off the tie band fixing the harness.Disconnect the harness from connector CN202 on the video board.Disconnect the tuner board from connector CN101 on the main board.Disconnect the SEA board and the audio board from connector CN452, CN301and CN302 on the main board.Disconnect the V-audio board from connector CN303 on the main board.Disconnect the relay board 4.Then, disconnect the video board and the S-video board from connector CN201 and CN241 on the main board.Disconnect the DSP board from connector CN501 and CN601 on the main board while removing the DSP board from the bracket fixing the lower part of the DSP board at the same time.Disconnect the compulink board from connector CN255 on the main board.1.2.3.4.5.6.7.8.Removing each board connected to the rear side of the main board(See Fig.5 to 9)Fig.5Fig.6Fig.7Fig.8Fig.8Fig.9CN202Main boardCN101Tie bandV-audio boardS-video boardVideo boardTuner boardAudio boardSEA boardMain boardCN452Main boardCN302,CN301Audio boardV-audio boardMain boardCN303CN301CN452CN302Relay board 4S-video boardVideo boardMain boardCN241CN303Main boardCN201Compulink boardMain boardCN255Main boardCN601DSP boardMain boardCN501CN241CN201BracketRX-7001PGD1-5Prior to performing the following procedure, remove the top cover and the rear panel.Removing the main board / regulator board (See Fig.10 to 12)It is not necessary to remove the boards connected to the back of the main board. But to disassemble the main board and the power supply board efficiently, remove them.ATTENTION: Disconnect the card wire from connector CN400 on the main board.Cut off the three tie bands fixing the harnesses.Disconnect the harness from connector CN811 on the power transformer board.Disconnect the relay board 1,2 and 3 from the main board and the power supply board.Disconnect the harness from connector CN704, CN821, CN901, CN711, CN712, CN931 and CN932.Remove the screw G attaching the regulator board to the heat sink cover.Remove the four screws H attaching the main board to the heat sink cover.Remove the five screws I and the screw J attaching the main board to the chassis base (The resistor board will come off at the same time).1.2.3.4.5.6.7.8.Prior to performing the following procedure, remove the top cover.Disconnect the harness from connector CN881 on the resistor board.Remove the screw J attaching the resistor board.1.2.Removing the resistor board (See Fig.13)Fig.10Fig.11Fig.12Fig.13Power supply boardTie bandRelay board 1Main boardCN400Relay board 2Tie bandMain boardRelay board 3CN811CN932CN961CN931CN712CN711CN901 CN821CN704HHGRegulator boardResistor boardIJIIMain boardPower transformerPower transformerJResistor boardCN881Main boardCN953RX-7001PGD1-6Prior to performing the following procedure, remove the top cover.Cut off the four tie bands fixing the harnesses.Disconnect the harnesses from connector CN711, CN712, CN704 and CN901 on the main board respectively.Disconnect the harnesses from connector CN953 on the SP terminal board.Remove the four screws K and six screws L attaching the amplifier board.1.2.3.4.Removing the amplifier board (See Fig.10 and 14)Prior to performing the following procedure, remove the top cover and the rear panel.Unsolder the six harnesses connected to the Voltage selector board.1.Removing the Voltage selector board(See Fig.16)Prior to performing the following procedures, remove the top cover.Unsolder the seven harnesses connected to the power transformer.Disconnect the harness from connector CN811 and the harnesses connected to connector CN55 and CN56 on the power transformer board.Remove the four screws M attaching the power transformer.1.2.3.Removing the power transformer(See Fig.15)Prior to performing the following procedure, remove the top cover and the rear panel.Remove the screw N attaching the power / fuse board.Unsolder the power cord and other harnesses connected to the power / fuse board.1.2.Removing the power / fuse board(See Fig.17)Fig.10Fig.14Fig.15Fig.17Power supply boardTie bandRelay board 1Main boardCN400Relay board 2Tie bandMain boardRelay board 3CN811CN932CN961CN931CN712CN711CN901 CN821CN704Power transformerAmplifier boardLLLK KCN711CN712Tie bandMMSolderCN55CN56CN811Power transformerSolderPower transformerNSolderPower / fuse boardPower cordCN953Fig.16Power transformerSolderVoltage selector boardRX-7001PGD1-7Prior to performing the following procedure, remove the top cover and the front panel.Remove the one nut attaching the headphone jack of the power supply board on the front side of the body.Disconnect the relay board 1, 2 and 3 from the power supply board and the main board respectively.Disconnect the harness connected to connector CN55 and CN56 on the power transformer board (If necessary, cut off the band fixing the harness on the side of the base chassis).Remove the four screws O attaching the power supply board and pull out the power supply board from the front bracket backward.Unsolder the three harnesses connected to the power supply board.1.2.3.4.5.Removing the power supply board (See Fig.18 and 19)Prior to performing the following procedure, remove the top cover and the front panel assembly.Pull out the volume knob on the front side of the front panel and remove the nut attaching the system control board.Remove the six screws P attaching the system control board on the back of the front panel and disconnect the harness from connector CN422 on the system control board.Disconnect the harness from connector CN430 on the power switch board.Remove the five screws Q attaching the power switch board.1.2.3.4.Removing the system control board / power switch board (See Fig.20 to 21)Fig.18Fig.19Fig.20Fig.21Power supply boardNutHeadphone jackTie bandTie bandRelay board 1Relay board 2Relay board 3Power transformerSolderOOOHeadphone jackSolderPower supply boardFront panelNutVolume knobSystem control boardPower switch boardFront panel assemblyPQCN430CN422QPPCN55CN56RX-7001PGD1-8Prior to performing the following procedure, remove the top cover, the front panel assembly and the system control board.Remove the six screws R attaching the operation switch board on the back of the front panel.On the back of the front panel, release the four joints by pushing the joint tabs inward. Remove the operation switch board toward the front.Pull out the multi jog knob and the source selector knob.Remove the two screws S attaching the operation switch board.1.2.3.4.Removing the operation switch board (See Fig.22 to 24)Fig.22Fig.23Fig.24Front panelRRRJointMulti jog knobSource selector knobSOperation switch boardRX-7001PGD1-9Adjustment method1.Set the volume control to minimum during this adjustment.(No signal & No load)2.Set the surround mode OFF.2.Turn VR787 and VR788 fully counterclockwise to warm up before adjustment.If the heat sink is already warm from previous use the correct adjustment can not be made.3.For L-ch,connect a DC voltmeter between TP781's pin1 and pin2 (Lch)And,connect it between pin3 and pin4(Rch).4.30 minutes later after power on, adjust VR787 for L-ch, or VR788 for R-ch so that the DC voltmeter value has 1mV10mV.1.Tuner rangeFM 87.5MHz108.0MHz AM(MW) 530kHz1710kHzTuner sectionPower amplifier sectionTP7814321LchRchVR787 (Lch)VR788 (Rch)Heat sinkMain boardAdjustment of idling currentMeasurement location TP781Adjustment part VR787(Lch) , VR788(Rch)AttentionThis adjustment does not obtain a correct adjustment value immediately after the amplifier isused (state that an internal temperature has risen). Please adj