JVC-RX7042S-avr-sm 维修电路原理图.pdf

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1、SERVICE MANUALCOPYRIGHT 2004 VICTOR COMPANY OF JAPAN, LIMITEDNo.MB1722004/3AUDIO/VIDEO CONTROL RECEIVERMB17220043RX-7042STABLE OF CONTENTS1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32S

2、PECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-53DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-64AD

3、JUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-135TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4、. 1-14 Area suffixJ - U.S.A.C - CanadaRadioFans.CN 收音机爱 好者资料库1-2 (No.MB172)SPECIFICATIONDesigns & specifications are subject to change without notice.AmplifierOutput PowerAt StereoOperationFront ch130 W per channel, min. RMS, driven into 8 , 20 Hz to 20 kHz, with no more than 0.08% total harmonicdis

5、tortion.At SurroundOperationFront ch130 W per channel, min. RMS, driven into 8 at 1 kHz, with no more than 0.8% total harmonic distortion.Center ch130 W, min. RMS, driven into 8 at 1 kHz, with no more than 0.8% total harmonic distortion.Surround ch130 W per channel, min. RMS, driven into 8 at 1 kHz,

6、 with no more than 0.8% total harmonic distortion.Surround Back ch130 W, min. RMS, driven into 8 at 1 kHz, with no more than 0.8% total harmonic distortion.AudioAudio Input Sensitivity/Impedance (1 kHz)DVD IN, VCR IN, TV SOUND/DBS IN : 200 mV/47 kCD IN, TAPE/CDR IN : 200 mV/47 kAudio Input(DIGITAL I

7、N)*CoaxialDIGITAL 1 (DVD) : 0.5 V(p-p)/75 OpticalDIGITAL 2 (CD), DIGITAL 3 (TV), DIGITAL 4 (CDR) : -21 dBm to -15 dBm (660 nm 30 nm)* Corresponding to Linear PCM, Dolby Digital, and DTS (with sampling frequency-32 kHz, 44.1 kHz, 48 kHz).Audio Output LevelSUBWOOFER OUT : 1 VRecording Output LevelVCR

8、OUT, TAPE/CDR OUT : 200 mVDigital Output Optical DIGITAL OUT Signal wave length : 660 nmOutput level : -21 dBm to -15 dBmSignal-to-Noise Ratio(66 IHF/78 IHF)DVD IN, VCR IN, TV SOUND/DBS IN : 87 dB/80 dBCD IN, TAPE/CDR IN : 87 dB/80 dBFrequency Response (8 )DVD IN, VCR IN, TV SOUND/DBS IN : 20 Hz to

9、100 kHz (+1 dB, -3 dB)CD IN, TAPE/CDR IN : 20 Hz to 100 kHz (+1 dB, -3 dB)Bass Boost+6 dB 1.0 dB at 100 HzEqualization63 Hz, 250 Hz, 1 kHz, 4 kHz, 16 kHz (8 dB) (in 2 dB steps)VideoVideo Input Sensitivity/ImpedanceComposite Video : DVD IN, VCR IN, TV SOUND/DBS IN1 V(p-p)/75 S-video : DVD IN, VCR IN,

10、 TV SOUND/DBS IN(Y: luminance) : 1 V(p-p)/75 (C: chrominance, burst) : 0.286 V(p-p)/75 Component Video DVD IN, DBS (VCR) IN : DVD IN, DBS (VCR) IN (Y: luminance) : 1 V(p-p)/75 (PB/PR) : 0.7 V(p-p)/75 Video Output LevelComposite Video : VCR OUT, MONITOR OUT1 V(p-p)/75 S-video : VCR OUT, MONITOR OUT(Y

11、: luminance) : 1 V(p-p)/75 (C: chrominance, burst) : 0.286 V(p-p)/75 Component Video : MONITOR OUT(Y: luminance) : 1 V(p-p)/75 (PB/PR) : 0.7 V(p-p)/75 SynchronizationNegativeSignal-to-Noise Ratio45 dBFM tuner (IHF)Tuning Range87.5 MHz to 108.0 MHzUsable SensitivityMonaural : 12.8 dBf (1.2 V/75 )50 d

12、B Quieting SensitivityMonaural : 16.0 dBf (1.7 V/75 )Stereo : 37.5 dBf (20.5 V/75 )Stereo Separation at OUT (REC)35 dB at 1 kHzAM tunerTuning Range530 kHz to 1 710 kHzGeneralPower RequirementsAC 120V , 60 HzPower Consumption320 W/440 VA (at operation), 2 W (in standby mode)Dimensions (W H D)435 mm 1

13、57 mm 425 mm (17 3/16 in. 6 3/16 in. 16 3/4 in.)Mass12.1 kg (26.7 lbs)RadioFans.CN 收音机爱 好者资料库(No.MB172)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 cha

14、nges 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.

15、 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 produc

16、ts 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

17、 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 th

18、e 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 edge

19、s 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

20、 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 A

21、C 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

22、.). 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

23、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. V

24、oltage 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.(

25、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 t

26、he 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 ( )

27、, 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.

28、AC VOLTMETER(Having 1000 ohms/volts,or more sensitivity)1500 10W0.15 F AC TYPE1-4 (No.MB172)1.5Importance administering point on the safetyCaution: For continued protection against risk offire, replace only with same type 6.3A/125V forF1, 2A/125V for F61 and F62.This symbol specifies type of fast op

29、erating fuse.Precaution: Pour eviter risques de feux, remplacezle fusible de surete de F1 comme le meme typeque 6.3A/125V, et 2A/125V pour F61 et F62.Ce sont des fusibles suretes qui functionnes rapide.Power trans 1 boardPower / fuse board6.3A-125VF12A-125VF612A-125VF62(No.MB172)1-5SECTION 2SPECIFIC

30、 SERVICE INSTRUCTIONSThis service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.1-6 (No.MB172)SECTION 3DISASSEMBLY3.1Removing the top cover (See Fig.1)(1) From the right and left sides of the main body, remove thefour screws A attaching the top cover.(2) From the back side of the main body,

31、 remove the threescrews B attaching the top cover.(3) Remove the top cover in the direction of the arrow 2 whileextending the lower sections of the top cover in the direc-tion of the arrow 1.Fig.13.2Removing the front panel assembly (See Figs.2 and 3) Prior to performing the following procedures, re

32、move the topcover.(1) Disconnect the card wire from the connector CN400 on themicon board. (See Fig.2)(2) Disconnect the card wire from the connector CN402 on thepower supply board. (See Fig.2)(3) Remove the tie band and wire protection board fixing thecard wire. (See Fig.2)(4) Remove the three scre

33、ws C attaching the front panel as-sembly. (See Fig.2)(5) From the bottom side of the main body, remove the fourscrews D attaching the front panel assembly. (See Fig.3)(6) Remove the front panel assembly in the direction of the ar-row. (See Fig.3)Fig.2Fig.3Top coverA211BACCCFront panel assemblyCard w

34、ireCN402Tie bandWireprotectionboardCN400MiconboardPowersupplyboardCard wireDDFront panel assembly(No.MB172)1-73.3Removing the rear panel (See Fig.4) Prior to performing the following procedures, remove the topcover.(1) From the back side of the main body, remove the strain re-lief from the rear pane

35、l in the direction of the arrow.(2) Remove the twenty-nine screws E, two screws F and threescrews G attaching the rear panel.Fig.43.4Removing the I/O board (See Fig.5) Prior to performing the following procedures, remove the topcover and rear panel.(1) Remove the two plastic rivets in the direction

36、of the arrowfrom the top side of the main body, remove the stopperboards in the direction of the arrow.(2) Remove the tie bands bundling the wires.(3) Disconnect the wire from the connector CN722 on the cen-ter board.(4) Disconnect the wire from the connector CN714 on the frontboard(L).(5) Disconnec

37、t the wire from the connector CN717 on the sur-round back board.(6) Disconnect the wire from the connector CN719 on the frontboard(R).(7) Disconnect the wire from the connector CN723 on the mainboard.(8) Disconnect the connectors (CN205, CN381, CN501) onthe I/O board in an upward direction.Fig.53.5R

38、emoving the tuner, DSP board, audio board, video board and S-video board (See Fig.6) Prior to performing the following procedures, remove the topcover, rear panel and I/O board.(1) Disconnect the card wire from the connector CN314 on theaudio board from the top side of the main body, take out thetun

39、er.(2) Disconnect the DSP board from the connector CN601 onthe micon board.(3) Disconnect the audio board from the connectors (CN101,CN303) on the micon board.(4) Disconnect the video board from the connector CN201 onthe micon board.(5) Disconnect the S-video board from the connector CN241on the mic

40、on board.Fig.6Strain reliefEGEFGEEE GRear panelCN381CN205CN501Plastic rivetPlasticrivetStopperboardStopper boardTiebandCenter boardTiebandsFront board(L)Surround boardFront board(R)CN719CN717CN714CN722CN723MainboardI/O boardCN314TunerAudio boardCard wireCN601DSP boardCN303CN101Video boardS-video boa

41、rdCN201CN241Micon board1-8 (No.MB172)3.6Removing the micon board (See Fig.7) Prior to performing the following procedures, remove the topcover, rear panel, I/O board, tuner, DSP board, audio board,video board and S-video board.(1) From the top side of the main body, disconnect the cardwire from the

42、connector CN400 on the micon board.(2) Disconnect the relay board from the connectors CN81 onthe micon board.(3) Disconnect the parallel wire from the connectors CN931and CN932 on the micon board.(4) Disconnect the parallel wire from the connector CN831 onthe main board.(5) Remove the three screws H

43、 attaching the micon board.(6) Remove the three screws J attaching the transistors(Q931, Q941, Q981) to the chassis base.(7) Loosen the screw K attaching the micon board.Fig.73.7Removing the speaker board (See Fig.8) Prior to performing the following procedures, remove the topcover and rear panel.(1

44、) From the top side of the main body, remove the tie bandbundling the wires.(2) Disconnect the wires from the connectors (CN813, CN814)on the main board.(3) Disconnect the parallel wire from the connectors (CN931,CN932) on the micon board.(4) Take out the speaker board in the direction of the arrow.

45、Fig.8CN400Micon boardRelayboardCN81Card wireCN931CN932HHHJTransistors(Q931,Q941,Q981)ChassisbaseKCN831Main boardTie bandCN813Main boardSpeaker boardCN814CN931CN932Micon board(No.MB172)1-93.8Removing the main board (See Fig.9) Prior to performing the following procedures, remove the topcover.(1) From

46、 the top side of the main body, remove the tie bandsbundling the wires.(2) Remove the tie band and wire protection board bundlingthe card wire.(3) Disconnect the wire from the connector CN811 on the pow-er transformer board 1.(4) Disconnect the relay board from the connectors (CN71,CN81) on the powe

47、r supply board and micon board.(5) Disconnect the parallel wires from the connectors (CN831,CN881) on the main board.(6) Disconnect the wires from the connectors (CN723, CN813,CN814) on the main board.(7) Disconnect the wire from the connector CN722 on the cen-ter board.(8) Disconnect the wire from

48、the connector CN714 on the frontboard(L).(9) Disconnect the wire from the connector CN717 on the sur-round back board.(10) Disconnect the wire from the connector CN719 on the frontboard(R).(11) Remove the screw K, four screws L, two screws M and twoscrews N attaching the main board.(12) Take out the

49、 main board.Fig.93.9Removing the heat sink (See Figs.10 and 11) Prior to performing the following procedures, remove the topcover and main board.(1) From the reverse side of the main board, remove the twoscrews P attaching the main board to the heat sink. (SeeFig.10)(2) Disconnect the connectors (CN

50、701-CN706) on the mainboard, remove the main board. (See Fig.10)(3) Remove the twelve screws Q attaching the heat sink. (SeeFig.11)Fig.10Fig.11Tie bandWireprotectionboardMicon boardCard wireTie bandsCN811Powertransformerboard 1CN71CN81RelayboardPowersupplyboardCN831CN881MainboardCN723CN814CN813Cente