JVC-RX6042S-avr-sm1维修电路原理图.pdf

SERVICE MANUAL COPYRIGHT 2004 Victor Company of Japan, Limited No.MB267 2004/6 AUDIO/VIDEO CONTROL RECEIVER MB26720046 RX-6042S TABLE OF CONTENTS 1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 2SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 3DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5 4ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13 5TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14 TA/NEWS/INFO DISPLAY MODE Area suffix A - Ausitralia RadioFans.CN 收音机爱 好者资料库 1-2 (No.MB267) SPECIFICATION *1: Corresponding to Linear PCM, Dolby Digital, and DTS Digital Surround (with sampling frequency-32 kHz, 44.1 kHz, 48 kHz) Designs and specifications are subject to change without notice. Amplifier Output Power At Stereo operationFront channels100 W per channel, min. RMS, driven into 8 , 40 Hz to 20 kHz with no more than 0.8% total harmonic distortion. At Surround operationFront channels100 W per channel, min. RMS, driven into 8 , at 1 kHz with no more than 0.8% total harmonic distortion. Center channel100 W, min. RMS, driven into 8 , at 1 kHz with no more than 0.8% total harmonic distortion. Surround chan- nels 100 W per channel, min. RMS, driven into 8 , at 1 kHz with no more than 0.8% total harmonic distortion. Audio Audio Input Sensitivity/Impedance (1 kHz) CD, TAPE/CDR, VCR, TV SOUND, DVD:220 mV/47 k Audio Input (DIGITAL IN)*1CoaxialDIGITAL 1 (DVD) OpticalDIGITAL 2 (CD), DIGITAL 3 (TV):-21 dBm to -15 dBm (660 nm 30 nm) Recording Output LevelTAPE/CDR, VCR:220 mV Signal-to-Noise Ratio (66 IHF/78 IHF) CD, TAPE/CDR, VCR, TV SOUND, DVD:87 dB/62 dB Frequency Response (8 )CD, TAPE/CDR, VCR, TV SOUND, DVD:20 Hz to 50 kHz (+1 dB, -3 dB) Bass Boost+3 dB 1 dB at 100 Hz Equalization (5 bands) 63 Hz, 250 Hz, 1 kHz, 4 kHz, 16 kHz:8 dB (in 2 dB steps) Video Video Input Sensitivity/ImpedanceComposite video:DVD, VCR1 V(p-p)/75 S-video:DVD, VCR(Y: luminance):1 V(p-p)/75 (C: chrominance, burst):0.286 V(p-p)/75 ComponentDVD, VCR(Y: luminance):1 V(p-p)/75 (PB, PR):0.7 V(p-p)/75 Video Output LevelComposite video:VCR, MONITOR OUT 1 V(p-p)/75 S-video:VCR, MONITOR OUT(Y: luminance):1 V(p-p)/75 :0.286 V(p-p)/75 (C: chrominance, burst) ComponentMONITOR OUT(Y: luminance):1 V(p-p)/75 (PB, PR)0.7 V(p-p)/75 SynchronizationNegative Signal-to-Noise Ratio45 dB RadioFans.CN 收音机爱 好者资料库 (No.MB267)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 purposes. 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 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. 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 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 Service 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 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 reassembling. (5) Leakage shock hazard testing After reassembling the product, always perform an isolation check 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 directly 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 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 exposed 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 preforming 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.MB267) SECTION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS. (No.MB267)1-5 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 direction of the arrow 1. Fig.1 3.2Removing the front panel assembly (See Figs.2 and 3) Prior to performing the following procedure, remove the top cover. (1) Disconnect the card wire from the connector CN402 on the audio board. (See Fig.2) (2) Disconnect the card wire from the connector CN201 on the power supply board. (See Fig.2) (3) Remove the tie bands. (See Fig.2) (4) Remove the wire protection board fixing the card wire. (See Fig.2) (5) Remove the three screws C attaching the front panel assembly. (See Fig.2) (6) From the bottom side of the main body, remove the four screws D attaching the front panel assembly. (See Fig.3) (7) Remove the front panel assembly in the direction of the arrow. (See Fig.3) Fig.2 Fig.3 B A 1 Top cover 1 2 A CCC Front panel assembly Card wire CN201 Power supply board Tie band Wire protection board Card wire CN402 Audio board D Front panel assembly D 1-6 (No.MB267) 3.3Removing the rear panel (See Fig.4) Prior to performing the following procedure, remove the top cover. (1) From the back side of the main body, remove the strain relief from the rear panel in the direction of the arrow. (2) Remove the twenty-seven screws E and four screws F attaching the rear panel. Fig.4 3.4Removing the component board and tuner unit (See Figs.5 and 6) Prior to performing the following procedure, remove the top cover. (1) From the top side of the main body, disconnect the parallel wire from the connector CN511 on the S-Video board. (See Fig.5) (2) From the back side of the main body, remove the four screws G attaching the component board. (See Fig.6) (3) From the top side of the main body, disconnect the card wire from the connector CN1 on the tuner unit. (See Fig.5) (4) From the back side of the main body, remove the two screws H attaching the tuner unit. (See Fig.6) Fig.5 Fig.6 F Rear panel E F EE Strain relief FE CN511 S-Video boardParallel wire Component boardTuner CN1 GH (No.MB267)1-7 3.5Removing the DSP board, audio input board, DVD board and video board (See Fig.7) Prior to performing the following procedure, remove the top cover and rear panel. (1) From the top side of the main body, Remove the tie band. (2) Disconnect the DSP board from the connector CN481 on the audio board. (3) Disconnect the audio input board from the connector CN421 on the audio board. (4) Disconnect the DVD board from the connector CN431 on the audio board. (5) Disconnect the video board from the connector CN441 on the audio board. Fig.7 3.6Removing the S-Video board (See Fig.8) Prior to performing the following procedure, remove the top cover and rear panel. (1) From the top side of the main body, disconnect the parallel wire from the connector CN511 on the S-Video board. (2) Disconnect the S-Video board from the connector CN461 on the audio board. Fig.8 CN481 Audio boardDVD board Video board CN421 Audio input board DSP board CN431 CN441 Audio board CN511 S-Video board CN461 1-8 (No.MB267) 3.7Removing the audio board (See Fig.9) Prior to performing the following procedure, remove the top cover, rear panel, component video board, DSP board, audio input board, DVD board, video board, S-Video board and tuner unit. (1) From the top side of the main body, disconnect the card wire from the connector CN402 on the audio board. (2) Disconnect the relay board from the connector CN491 on the audio board. (3) Disconnect the wires from the connectors CN471, CN472 and CN473 on the audio board. (4) Remove the three screws J attaching the audio board. (5) Loosen the screw K attaching the audio board. Fig.9 3.8Removing the speaker terminal board (See Fig.10) Prior to performing the following procedure, remove the top cover and rear panel. (1) From the top side of the main body, remove the solders from the soldered sections a on the speaker terminal board. Fig.10 Audio board CN402 CN473 CN471 CN472 Power supply board CN491 J J K Relay board Soldered sections a Parallel wires Speaker terminal board (No.MB267)1-9 3.9Removing the main board (See Fig.11) Prior to performing the following procedure, remove the top cover. (1) From the top side of the main body, remove the tie bands fixing the wires. (2) Remove the tie band and wire protection board fixing the card wire. (3) Remove the solders from the soldered section b on the speaker terminal board attaching the parallel wires. (4) Disconnect the relay board from the connectors (CN291, CN491) on the power supply board and audio board. (5) Disconnect the parallel wire from the connector CN241 on the power supply board. (6) Disconnect the wire from the connector CN251 on the power transformer board 1. (7) Disconnect the wires from the connectors CN471, CN472 and CN473 on the audio board. (8) Remove the screw L, two screws M and four screws N attaching the main board. (9) Take out the main board. Fig.11 3.10 Removing the heat sink (See Figs.12 and 13) Prior to performing the following procedure, remove the top cover and main board. (1) Remove the ten screws P attaching the heat sink. (See Fig.12) (2) From the reverse side of the main board, remove the two screws Q attaching the heat sink. (See Fig.13) Fig.12 Fig.13 M N Soldered section b Power transformer board 1 CN241 Power supply board Tie band Wire protection board Card wire CN251 Speaker terminal board CN492 Tie bands Tie band Tie band CN291 CN472 CN471 CN473 Audio board Parallel wires Relay board N N M L Main board P P Heat sink Main board Heat sink Main board Q Q 1-10 (No.MB267) 3.11 Removing the center amp. board, front amp. boards (L/R) and rear amp. boards (L/R) (See Figs.12 and 14) Prior to performing the following procedure, remove the top cover and main board. (1) Remove the ten screws P attaching the heat sink. (See Fig.12) (2) Disconnect the center amp. board from the connector CN321 on the main board. (See Fig.14) (3) Disconnect the front amp. board (L) from the connector CN311 on the main board. (See Fig.14) (4) Disconnect the front amp. board (R) from the connector CN312 on the main board. (See Fig.14) (5) Disconnect the rear amp. board (L) from the connector CN331 on the main board. (See Fig.14) (6) Disconnect the rear amp. board (R) from the connector CN332 on the main board. (See Fig.14) Fig.14 3.12 Removing the power transformer (See Fig.15) Prior to performing the following procedure, remove the top cover. (1) From the top side of the main body, remove the tie bands fixing the wires. (2) Remove the solders from the soldered section c on the power transformer board 1. (3) Remove the solders from the soldered sections d on the power transformer board 2. (4) Disconnect the wire from the connector CN251 on the power transformer board 1. (5) Remove the four screws R attaching the power transformer. 3.13 Removing the power/fuse board (See Fig.15) Prior to performing the following procedure, remove the top cover. (1) From the back and top sides of the main body, remove the screw S and screw T attaching the power/fuse board. (2) Remove the solders from the soldered sections e attaching the power cord. (3) From the reverse side of the power/fu