Jvc-RX-7020-VBK-Service-Manual电路原理图.pdf

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1、SERVICE MANUALAUDIO/VIDEO CONTROL RECEIVERNo.21075Mar. 2002COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.RX-7020VBKRX-7020VBKContentsSafety precautions -1-2Importance administering point on the safety - 1-3Disassembly method -1-4Adjustment method -1-9Description of major ICs -1-1024Area suffixJ - U.S.

2、A.DVD VCR TV SOUND/DBSADJUSTRX-7020V AUDIO/VIDEO CONTROL RECEIVERSETTINGMASTER VOLUMECONTROLDOWN UPCD TAPE/CDRSOURCE NAMEBASS BOOSTINPUTANALOG/DIGITALSPEAKERS ON/OFFSURROUND MODEPHONESSURROUND ON/OFFFM/AM TUNINGSTANDBYSTANDBY/ONFM/AM PRESET FM MODEMEMORYINPUT ATTFM/AMDVD MULTIPHONOSOURCE NAME12COMPU

3、LINKRemoteCONTROL231564897/P0 +1010BASS BOOST EFFECTMENUENTERTEST REAR L +DIMMER SUB WOOFER + REAR R +MUTINGCH TV VOL/REW FF/VOLUMECATV/DBSTV/VIDEORECPAUSERETURN FM MODE 100+CONTROLA/V CONTROL RECEIVERRM-SRX7020J REMOTE CONTROLCATV/DBS VCR TV AUDIOSURROUNDMODE INPUTON/OFFDVD MULTIDVD CDTAPE/CDRTREBL

4、ETV/DBS VCR PHONOFM/AMBASSSURROUND ANALOG/DIGITAL SLEEP CENTER +TUNINGSOUNDRX-7020VBK1-21. 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 authorize

5、d 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

6、. 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

7、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 S

8、ervice 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 Li

9、st 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 h

10、azard. 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

11、 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 directl

12、y 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 che

13、ck 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 vo

14、ltage 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. Volta

15、ge 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 mu

16、st 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

17、 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 sid

18、e) 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.)RX-7020VBK1-3Caution: For continued protection against risk offire

19、, 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 f

20、unctionnes rapide.Importance administering point on the safety Secondary partsPrimary partFC211FC212R1EP1B106B105B104TA201TA202PW104PW102PW105PW103PW101B103B102B101B108B107B109B110CN251D205FC221FC222FC231FC232R201RY201110111 112113 114120121122 130131B192B191B160B1596.3A-125V2A-125V2A-125VF 201F 203

21、F 202LVA1029-C9LVA1029-C76.3A-125VRX-7020VBK1-4Remove 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 of the arrow while pulling both sides outward.1.2.3.Disassembly methodRemoving

22、 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 thirty-two screws E attaching the each boards to the rear panel on the back of the body.Remove the four

23、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 CN402 on the audio board and CN201 on the power supply board in the front panel assembly.Cut of

24、f the tie band fixing the harness.Remove the three screws C attaching the front panel assembly.Remove the four 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.Removing the front panel assembly (See Fig.2 and 3)Fig.1Fig.2

25、Fig.3Fig.4A 2A 2BTop coverCPower supply boardAudio boardCN402MainboardTie bandDEEF EFFCord stopperCFront panel assemblyFront panel assemblyDRear panelCN201EEEE ERX-7020VBK1-5Prior to performing the following procedure, remove the top cover and the rear panel.Cut off the tie band fixing the harness.D

26、isconnect the DSP board from connector CN481 on the audio board.Disconnect the audio input board, DVD board Video board and the S video board from connector CN421, CN431, CN441 and CN461 on the audio board.Disconnect the Component video board from connector CN511 on the S video board.Disconnect the

27、tuner board from connector CN411 on the audio board.1.2.3.4.5.Removing each board connected to the rear side of the audio board(See Fig.5 to 9)Fig.5Fig.6Fig.7Fig.8CN411Tie bandDSPboardDVDboardVideo boardTunerboardAudioinputboardDSP boardCN481CN441CN431CN421CN481CN421CN431CN441CN411Tie bandCN421CN431

28、CN441AudioinputboardDVDboardVideo boardTuner boardAudioboardCN461S Video boardCN461S Video boardComponent video boardCN511Fig.9Component video boardCN511RX-7020VBK1-6Prior to performing the following procedure, remove the top cover and the rear panel.Removing the audio board (See Fig.10)Disconnect t

29、he card wire from connector CN402 on the audio board.Disconnect the relay board from the audio board and the power supply board. (CN291, CN491)Disconnect the harness from connector CN471, CN472, CN473.Remove the three screws G attaching the audio board assembly.Remove the screw H attaching the audio

30、 board assembly.1.2.3.4.5.Removing the Heat sink (See Fig.12 to 14)Prior to performing the following procedure, remove the top cover, the rear panel and audio board.Disconnect the harness from connector CN241 and CN203 on the power supply board respectively.Disconnect the harness from connector CN25

31、1 on the power transformer board .Remove the four screws I and the two screws J attaching the main board.1.2.3.Removing the main board (See Fig.11)Prior to performing the following procedure, remove the top cover and main board.Remove the two screws K attaching the heat sink to the reverse side of m

32、ain board.Disconnect the for connectors with each amp. board, and remove the main board.Remove the four screws M and ten screws L attaching the heat sink.1.2.3.Fig.10Fig.13Fig.11Fig.12powersupply boardPower / FuseboardRelay board CN473Audio boardMain boardrear sideMainboardHeat sink CN291CN203CN491

33、HGCN471CN402CN472Power transformerGGCN241IIIIJJLLK KMMCN251LFig.14Main boardRear Rch amp. boardFront Lch amp. boardFront Rch amp. boardCenter amp. boardRear Lch amp. boardHeat sink CN802CN801CN302CN301CN901RX-7020VBK1-7Prior to performing the following procedure, remove the top cover and the rear pa

34、nel.Remove the screw O 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.15)Prior to performing the following procedures, remove the top cover.Cut off the tie band fixing the harness.Unsolder t

35、he two harnesses connected to the power transformer.Unsolder the harness connected to the FW201 on the power transformer board.Remove the four screws N attaching the power transformer.1.2.3.4.Removing the power transformer(See Fig.15)Prior to performing the following procedure, remove the top cover

36、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 harness connected to connector CN241, CN201, CN203, and CN291 on the power supply board (If necessary, cut off the band fixing the harness on the side of the bas

37、e chassis).Remove the three screws P 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.Removing the power supply board (See Fig.16 , 17)Fig.15Fig.16Fig.17Powersupply boardPower

38、 transformerNCN241SolderpointsNSolderpointsSolderpointsOPower / fuse boardPower cordPower supplyboardNutHeadphone jackHeadphone jackTie bandSolder pointsPPPSolderpointsCN201CN291HookPower transformerboardFW201CN203RX-7020VBK1-8Prior to performing the following procedure, remove the top cover and the

39、 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 two screws Q attaching the power switch board.Disconnect the harness from connector CN714 on the power switch board.Remove the six screws R attaching t

40、he system control board on the back of the front panel.On the back of the front panel, release the six joints by pushing the joint tabs inward. Remove the operation switch panel toward the front.Release the two hook attaching the system control board.1.2.3.4.5.6.Removing the system control board / p

41、ower switch board (See Fig.18 to 20)Fig.18Fig.19Fig.20Front panel assemblyNutVolume knobSystem control boardPower switchboardRRCN714QJointJointJoint Joint Joint JointHookHookOperation switch panelRX-7020VBK1-9Adjustment method1. Set the volume control to minimum during this adjustment. (No signal &

42、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 TP3

43、02s B218 and B219 (Rch).5. Adjust the VR301 (Lch) and VR302 (Rch) so that the DC voltmeter indicates 2.0mV immediately after turning the power on.1. Tuner rangeFM 87.5MHz108.0MHz AM (MW) 530kHz1710kHzTuner sectionPower amplifier sectionTP302 (Rch)VR301 (Lch)VR302 (Rch)Heat sinkAdjustment of idling c

44、urrentMeasurement 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

45、 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 variableresistance (VR301, VR302) in the direction of counterclockwise. TP301 (Lch)RX-7020VBK1-10123456789101133

46、3231302928272625242312 13 14 15 16 17 18 19 20 21 2244 43 42 41 40 39 38 37 36 35 341.Pin layoutAK4527BVQP (IC601) : A/D,D/A converterTop ViewNo.123456789101112131415161718SymbolSDOSOSKSMISBICKLRCKSDTI1SDTI2SDTI3SDTOD,AUXDFSDEMIDEMOMCKODVDDDVSSPDXTSSDTO Source Select Pin (Note 1)“L“ : Internal ADC o

47、utput, “H“ : DAUX input Control Mode Select Pin“L“ : 3-wire Serial, “H“ : I2C BusSoft Mute Pin (Note 1), Connect to GNDWhen 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 In

48、put 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 GNDNo 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,