JVC-RX7042S-avr-sm维修电路原理图.pdf

SERVICE MANUAL COPYRIGHT 2004 VICTOR COMPANY OF JAPAN, LIMITED No.MB172 2004/3 AUDIO/VIDEO CONTROL RECEIVER MB17220043 RX-7042S TABLE OF CONTENTS 1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 2SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5 3DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6 4ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13 5TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 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. 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 : 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 LevelSUBWOOFER 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 (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, 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, MONITOR 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 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 VA (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 components 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 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 characteris- tics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by us- ing replacement components 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. 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, 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 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 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, particular- ly any exposed metal part having 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 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 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 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. 1.3Caution Burrs formed during molding may be left over on some parts of the chassis. Therefore, pay attention to such burrs in the case of pre- forming repair of this system. 1.4Critical parts for safety In regard with component parts appearing on the silk-screen printed side (parts side) 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. When replacing them, be sure to use the parts of the same type and rating as specified by the manufacturer. (This regulation dose not Except the J and C version) Good earth ground Place this probe on each exposed metal part. AC VOLTMETER (Having 1000 ohms/volts, or more sensitivity) 1500 10W 0.15 F AC TYPE 1-4 (No.MB172) 1.5Importance administering point on the safety Caution: For continued protection against risk of fire, replace only with same type 6.3A/125V for F1, 2A/125V for F61 and F62. This symbol specifies type of fast operating fuse. Precaution: Pour eviter risques de feux, remplacez le fusible de surete de F1 comme le meme type que 6.3A/125V, et 2A/125V pour F61 et F62. Ce sont des fusibles suretes qui functionnes rapide. Power trans 1 board Power / fuse board 6.3A-125V F1 2A-125V F61 2A-125V F62 (No.MB172)1-5 SECTION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS. 1-6 (No.MB172) SECTION 3 DISASSEMBLY 3.1Removing the top cover (See Fig.1) (1) From the right and left sides of the main body, remove the four screws A attaching the top cover. (2) From the back side of the main body, remove the three screws B attaching the top cover. (3) Remove the top cover in the direction of the arrow 2 while extending the lower sections of the top cover in the direc- tion of the arrow 1. Fig.1 3.2Removing the front panel assembly (See Figs.2 and 3) Prior to performing the following procedures, remove the top cover. (1) Disconnect the card wire from the connector CN400 on the micon board. (See Fig.2) (2) Disconnect the card wire from the connector CN402 on the power supply board. (See Fig.2) (3) Remove the tie band and wire protection board fixing the card wire. (See Fig.2) (4) Remove the three screws C attaching the front panel as- sembly. (See Fig.2) (5) From the bottom side of the main body, remove the four screws 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.2 Fig.3 Top cover A 2 1 1 B A CCC Front panel assembly Card wire CN402 Tie band Wire protection board CN400 Micon board Power supply board Card wire DD Front panel assembly (No.MB172)1-7 3.3Removing the rear panel (See Fig.4) Prior to performing the following procedures, remove the top cover. (1) From the back side of the main body, remove the strain re- lief from the rear panel in the direction of the arrow. (2) Remove the twenty-nine screws E, two screws F and three screws G attaching the rear panel. Fig.4 3.4Removing the I/O board (See Fig.5) Prior to performing the following procedures, remove the top cover and rear panel. (1) Remove the two plastic rivets in the direction of the arrow from the top side of the main body, remove the stopper boards 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 front board(L). (5) Disconnect the wire from the connector CN717 on the sur- round back board. (6) Disconnect the wire from the connector CN719 on the front board(R). (7) Disconnect the wire from the connector CN723 on the main board. (8) Disconnect the connectors (CN205, CN381, CN501) on the I/O board in an upward direction. Fig.5 3.5Removing the tuner, DSP board, audio board, video board and S-video board (See Fig.6) Prior to performing the following procedures, remove the top cover, rear panel and I/O board. (1) Disconnect the card wire from the connector CN314 on the audio board from the top side of the main body, take out the tuner. (2) Disconnect the DSP board from the connector CN601 on the 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 on the micon board. (5) Disconnect the S-video board from the connector CN241 on the micon board. Fig.6 Strain relief E G EF GE E E G Rear panel CN381 CN205 CN501 Plastic rivet Plastic rivet Stopper board Stopper board Tie band Center board Tie bands Front board(L) Surround board Front board(R) CN719 CN717CN714 CN722 CN723 Main board I/O board CN314 Tuner Audio board Card wire CN601 DSP board CN303 CN101 Video board S-video board CN201CN241 Micon board 1-8 (No.MB172) 3.6Removing the micon board (See Fig.7) Prior to performing the following procedures, remove the top cover, 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 card wire from the connector CN400 on the micon board. (2) Disconnect the relay board from the connectors CN81 on the micon board. (3) Disconnect the parallel wire from the connectors CN931 and CN932 on the micon board. (4) Disconnect the parallel wire from the connector CN831 on the main board. (5) Remove the three screws H 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.7 3.7Removing the speaker board (See Fig.8) Prior to performing the following procedures, remove the top cover and rear panel. (1) From the top side of the main body, remove the tie band bundling 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. Fig.8 CN400 Micon board Relay board CN81 Card wire CN931 CN932 H H H J Transistors (Q931,Q941,Q981) Chassis base K CN831 Main board Tie band CN813 Main board Speaker boardCN814 CN931 CN932 Micon board (No.MB172)1-9 3.8Removing the main board (See Fig.9) Prior to performing the following procedures, remove the top cover. (1) From the top side of the main body, remove the tie bands bundling the wires. (2) Remove the tie band and wire protection board bundling the 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 power 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 the connector CN714 on the front board(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 front board(R). (11) Remove the screw K, four screws L, two screws M and two screws N attaching the main board. (12) Take out the main board. Fig.9 3.9Removing the heat sink (See Figs.10 and 11) Prior to performing the fol