JVC-RX8040B-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.MB303 2004/7 AUDIO/VIDEO CONTROL RECEIVER MB30320047 RX-8040B TABLE OF CONTENTS 1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2、 . 1-3 2SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 3DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3、. . 1-5 4ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15 5TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4、. . . . . . . 1-16 Area suffix UJ - U.S.Military RadioFans.CN 收音机爱 好者资料库 1-2 (No.MB303) SPECIFICATION *1: Measured on AC 110 V, 127 V, 220 V and 240 V *2: Corresponding to Linear PCM, Dolby Digital, and DTS (with sampling frequency -32 kHz, 44.1 kHz, 48 kHz). Designs & specifications are subject to

5、change without notice. Amplifier Output Power At Stereo Operation Front Channel100 W*1 per channel, min. RMS, driven into 8 at 1 kHz with no more than 0.8% total harmonic distortion (IEC268-3/DIN). At Surround Opera- tion Front Channel100 W*1 per channel, min. RMS, driven into 8 at 1 kHz, with no mo

6、re than 0.8% total harmonic distortion. Center Channel100 W*1, min. RMS, driven into 8 at 1 kHz, with no more than 0.8% total harmonic distortion. Surround Channel100 W*1 per channel, min. RMS, driven into 8 at 1 kHz, with no more than 0.8% total harmonic distortion. Surround Back Channel 100 W*1, m

7、in. 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 1 IN, VCR 2 IN, TV SOUND/DBS IN, VIDEO:200 mV/47 k TAPE/MD IN, CDR IN, CD IN:200 mV/47 k PHONO IN (MM):2.5 mV/47 k Audio Input (DIGI- TAL IN)*2 CoaxialDIGITAL

8、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) Audio Output LevelZONE 2 PREOUT:1 V PREOUT:1 V Recording Output LevelTAPE/MD OUT, CDR OUT, VCR 1 OUT, VCR 2 OUT:200 mV Digital Output (DIGITAL OUT):OpticalSignal wave length:660 nm Output l

9、evel:-21 dBm to -15 dBm Signal-to-Noise Ratio (66 IHF/78 IHF)DVD IN, VCR 1 IN, VCR 2 IN, TV SOUND/DBS IN, VIDEO:87 dB/80 dB TAPE/MD IN, CDR IN, CD IN:87 dB/80 dB PHONO IN (MM):70 dB/78 dB at OUT (REC) Frequency Response (8 )DVD IN, VCR 1 IN, VCR 2 IN, TV SOUND/DBS IN, VIDEO:20 Hz to 100 kHz (+1 dB,

10、- 3 dB) TAPE/MD IN, CDR IN, CD IN:20 Hz to 100 kHz (+1 dB, -3 dB) PHONO IN (MM):20 Hz to 20 kHz (1 dB) RIAA Phono Equalization1.0 dB (20 Hz to 20 kHz) 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) VideoVideo Input Sensitivity/ImpedanceComposit

11、e Video:DVD IN, TV SOUND/ DBS IN, VCR 1 IN, VCR 2 IN, VIDEO 1 V(p-p)/75 S-video:DVD IN, TV SOUND/DBS IN, VCR 1 IN, VCR 2 IN, VIDEO (Y: luminance):1 V(p-p)/75 (C: chrominance, burst):0.286 V(p-p)/75 Component Video :DVD IN, DBS (VCR 1) IN (Y: luminance):1 V(p-p)/75 (PB/PR):0.7 V(p-p)/75 Video Output

12、LevelComposite Video:VCR 1 OUT, VCR 2 OUT, MONITOR OUT 1 V(p-p)/75 S-video:VCR 1 OUT, VCR 2 OUT, MONI- TOR OUT (Y: luminance):1 V(p-p)/75 (C: chrominance, burst):0.286 V(p-p)/75 Composite Video:MONITOR OUT(Y: luminance):1 V(p-p)/75 (PB/PR):0.7 V(p-p)/75 SynchronizationNegative Signal-to-Noise Ratio4

13、5 dB FM tuner (IHF) Tuning Range87.50 MHz to 108.00 MHz Usable SensitivityMonaural12.8 dBf (1.2 V/75 ) 50 dB Quieting SensitivityMonaural16.0 dBf (1.7 V/75 ) Stereo37.5 dBf (20.5 V/75 ) Stereo Separation at OUT (REC)35 dB at 1 kHz AM tuner Tuning Range531 kHz to 1 602 kHz (at 9 kHz intervals) 530 kH

14、z to 1 600 kHz (at 10 kHz intervals) General Power RequirementsAC 110 V/127 V/220 V/230 V - 240 V , adjustable with the voltage selector, 50 Hz/60 Hz Power Consumption220 W (at operation) 6.0 W (in standby mode) Dimensions (W H D)435 mm 157 mm 425 mm Mass12.4 kg RadioFans.CN 收音机爱 好者资料库 (No.MB303)1-3

15、 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. Replace

16、ment 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

17、 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 evi

18、dent 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 c

19、omponents 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

20、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

21、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 (a

22、n- 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 Curr

23、ent 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 directl

24、y 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 vol

25、tmeter. 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

26、 (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

27、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 att

28、ention 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 ( ) o

29、r 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 (Havi

30、ng 1000 ohms/volts, or more sensitivity) 1500 10W 0.15 F AC TYPE 1-4 (No.MB303) SECTION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS. (No.MB303)1-5 SECTION 3 DISASSEMBLY 3.1Removing the top cover (See Fig.1) (1) From the both sides of the main b

31、ody, 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 3.2

32、Removing the rear panel (See Fig.2) 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 three screws C, thirty-five screws D, two screws E, two screws

33、 F and nut a attaching the rear panel. 3.3Removing the RF unit and compu board (See Figs.2 and 3) Prior to performing the following procedures, remove the top cover. (1) From the top side of the main body, cut off the tie band. (See Fig.3) (2) Disconnect the wire from the connector CN1 on the RF uni

34、t. (See Fig.3) (3) From the back side of the main body, remove the nut a at- taching the RF unit. (See Fig.2) (4) From the top side of the main body, disconnect the wire from the connector CN262 on the relay board. (See Fig.3) (5) From the back side of the main body, remove the two screws F attachin

35、g the compu board. (See Fig.2) Fig.2 Fig.3 Top cover A 2 1 1 B A C Strain relief C Rear panel D C D DED D F Nut a CN262 Relay board CN1 Compu board RF unit Tie band 1-6 (No.MB303) 3.4Removing the I/O board (See Fig.4) Prior to performing the following procedures, remove the top cover and rear panel.

36、 (1) From the top side of the main body, remove the two plastic rivets in the direction of the arrow 1, and remove the stop- per boards in the direction of the arrow 2. (2) Cut off the tie bands bundling the wires. (3) Disconnect the wire from the connector CN722 on the cen- ter board. (4) Disconnec

37、t 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 I

38、/O board from the connectors (CN205, CN361, CN381 and CN501) in an upward direction. Fig.4 1 2 2 CN381 CN205 CN501 Plastic rivet Plastic rivet Stopper board Stopper board Tie band Center boardFront board(L)Surround back board Front board(R) CN719 CN717CN714 CN722 CN723 Main board I/O board 1 CN361 T

39、ie bands (No.MB303)1-7 3.5Removing the front panel assembly (See Figs.5 and 6) Prior to performing the following procedures, remove the top cover, rear panel and I/O board. (1) From the top side of the main body, remove the tie bands bundling the wires. (See Fig.5) (2) Disconnect the wire from the c

40、onnector CN599 on the DSP board. (See Fig.5) (3) Disconnect the wire from the connector CN415 on the audio2 board. (See Fig.5) (4) Disconnect the wire from the connector CN206 on the vid- eo board. (See Fig.5) (5) Disconnect the wire from the connector CN244 on the S- Video board. (See Fig.5) (6) Di

41、sconnect the card wire from connector CN402 on the power supply board. (See Fig.5) (7) Disconnect the card wire from connector CN400 on the mi- con board. (See Fig.5) (8) Remove the tie band and wire protection board fixing the card wire. (See Fig.5) (9) Remove the two screws G, screws G and screw H

42、 attach- ing the front panel assembly. (See Fig.5) (10) From the bottom side of the main body, remove the four screws J attaching the front panel assembly. (See Fig.6) (11) Remove the front panel assembly in the direction of the ar- row. (See Fig.6) Reference: When attaching the screw G and screw H,

43、 attach the earth wire with it. Fig.5 Fig.6 GG GH Front panel assemblyEarth wire Earth wire CN402 Power supply board Tie band Tie band Micon board CN244 S-Video boardVideo board CN206CN415 Audio2 board CN599 DSP board CN400 Tie band Card wire Tie band Wire protection board JJ Front panel assembly 1-

44、8 (No.MB303) 3.6Removing the tuner, DSP board, Audio board, Audio2 board, Video board and S-Video board (See Fig.7) Prior to performing the following procedures, remove the top cover, rear panel and I/O board. (1) From the top side of the main body, cut off the tie band bun- dling the wire. (2) Disc

45、onnect the card wire from connector CN314 on the au- dio board, and take out the tuner. (3) Disconnect the wire from the connector CN599 on the DSP board. (4) Disconnect the DSP board from the connector CN601 on the micon board, and take out the DSP board. (5) Disconnect the audio board from the con

46、nectors (CN101 and CN303) on the micon board, and take out the audio board. (6) Disconnect the wire from the connector CN415 on the audio2 board. (7) Disconnect the audio2 board from the connector CN301 on the micon board, and take out the audio2 board. (8) Disconnect the wire from the connector CN2

47、06 on the vid- eo board. (9) Disconnect the video board from the connector CN201 on the micon board, and take out the video board. (10) Disconnect the wire from the connector CN244 on the S- Video board. (11) Disconnect the S-Video board from the connector CN241 on the micon board, and take out the

48、S-Video board. Fig.7 3.7Removing the micon board (See Fig.8) Prior to performing the following procedures, remove the top cover, rear panel, I/O board, tuner, DSP board, Audio board, Audio2 board, Video board and S-Video board. (1) From the top side of the main body, disconnect the card wire from th

49、e connector CN400 on the micon board. (2) Disconnect the relay board from the connector 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 K attaching the micon board. (6) Remove the three screws L attaching the transistors (Q921, Q931, and Q941) to the chassis base. (7) Loosen the screw M attaching the micon board. Fig.8 CN314 Tuner Audio board Card wire CN601 DSP