JVC-RX7040B-avr-sm 维修电路原理图.pdf
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1、SERVICE MANUALCOPYRIGHT 2004 VICTOR COMPANY OF JAPAN, LIMITEDNo.MB1702004/3AUDIO/VIDEO CONTROL RECEIVERMB17020043RX-7040BTABLE 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.MB170)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.MB170)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
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