JVC-RX7042S-avr-sm维修电路原理图.pdf
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1、SERVICE MANUAL COPYRIGHT 2004 VICTOR COMPANY OF JAPAN, LIMITED No.MB172 2004/3 AUDIO/VIDEO CONTROL RECEIVER MB17220043 RX-7042S TABLE OF CONTENTS 1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2、 . 1-3 2SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5 3DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3、. . 1-6 4ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13 5TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4、. . . . . . . 1-14 Area suffix J - U.S.A. C - Canada RadioFans.CN 收音机爱 好者资料库 1-2 (No.MB172) SPECIFICATION Designs & specifications are subject to change without notice. Amplifier Output Power At Stereo Operation Front ch130 W per channel, min. RMS, driven into 8 , 20 Hz to 20 kHz, with no more than
5、0.08% total harmonic distortion. At Surround Operation Front 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.
6、 RMS, driven into 8 at 1 kHz, 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. Audio Audio Input Sensitivity/ Impedance (1 kHz) DVD IN, VCR IN, TV SOUND/DBS IN : 200 mV/47 k CD IN, TAPE/CDR IN
7、 : 200 mV/47 k Audio Input (DIGITAL IN)* 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 LevelSUBWO
8、OFER OUT : 1 V Recording Output LevelVCR OUT, TAPE/CDR OUT : 200 mV Digital Output Optical DIGITAL OUT Signal wave length : 660 nm Output level : -21 dBm to -15 dBm Signal-to-Noise Ratio (66 IHF/78 IHF) DVD IN, VCR IN, TV SOUND/DBS IN : 87 dB/80 dB CD IN, TAPE/CDR IN : 87 dB/80 dB Frequency Response
9、 (8 )DVD IN, VCR IN, TV SOUND/DBS IN : 20 Hz to 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 Hz Equalization63 Hz, 250 Hz, 1 kHz, 4 kHz, 16 kHz (8 dB) (in 2 dB steps) Video Video Input Sensitivity/ImpedanceComposite Video : DVD IN, VCR IN,
10、 TV SOUND/DBS IN1 V(p-p)/75 S-video : DVD IN, VCR IN, 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, MO
11、NITOR OUT1 V(p-p)/75 S-video : VCR OUT, MONITOR OUT(Y: 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 SynchronizationNegative Signal-to-Noise Ratio45 dB FM tuner (IHF) Tuning Range87.5 MHz to 108.0
12、MHz Usable SensitivityMonaural : 12.8 dBf (1.2 V/75 ) 50 dB 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 kHz AM tuner Tuning Range530 kHz to 1 710 kHz General Power RequirementsAC 120V , 60 Hz Power Consumption320 W/440 V
13、A (at operation), 2 W (in standby mode) Dimensions (W H D)435 mm 157 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)1-3 SECTION 1 PRECAUTION 1.1Safety Precautions (1) This design of this product contains special hardware and many circuits and c
14、omponents specially for safety purpos- es. 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 per- formed by qualified personnel on
15、ly. (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 prope
16、rty damage resulting therefrom. (3) Many electrical and mechanical parts in the products have special safety-related characteristics. These characteris- tics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by us- ing replacement components
17、 rated for higher voltage, watt- age, etc. Replacement parts which have these special safety characteristics are identified in the Parts List of Ser- vice Manual. Electrical components having such features are identified by shading on the schematics and by ( ) on the Parts List in the Service Manual
18、. The use of a substitute replacement which does not have the same safety charac- teristics 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, barrie
19、rs 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
20、normal, after reassem- bling. (5) Leakage shock hazard testing After reassembling the product, always perform 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 product is safe t
21、o 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, particular- ly any exposed metal part h
22、aving a return path to the chassis, to a known good earth ground. Any leakage cur- rent must not exceed 0.5mA AC (r.m.s.). Alternate check method Plug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 per volt or more sensitivity in the following manner. Connect a 1,500
23、 10W resistor paralleled by a 0.15F AC-type capacitor between an ex- posed 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
24、the chassis, and measure 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.). 1.2Warning (1) This equipment has been designed and manufactured to meet i
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