JVC-JXS555-avs-sm维修电路原理图.pdf

《JVC-JXS555-avs-sm维修电路原理图.pdf》由会员分享，可在线阅读，更多相关《JVC-JXS555-avs-sm维修电路原理图.pdf（46页珍藏版）》请在收音机爱好者资料库上搜索。

1、SERVICE MANUAL AV SELECTOR No.70251 Mar. 2001 COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD. Printed in Japan 0103(S) VICTOR COMPANY OF JAPAN, LIMITED COMMUNICATION NETWORK BUSINESS UNIT, 1644, SHIMOTSURUMA, YAMATO-SHI, KANAGAWA-KEN, 242-8514, JAPAN JX-S555 (J) No.70251 JX-S555(J)JX-S555(J) JX-S555(J)

2、No. 70251 Contents Safety Precautions .2 Main Parts Locations .3 Disassembly of Parts .4 Connection Diagram . 6 Circuit Description . 7 Adjustments . 11 Position of ICs and Adjustment Points . 12 Servicing Guidelines . 13 Block View Inside IC . 17 Design and specifications are subject to change with

3、out notice. RadioFans.CN 收音机爱 好者资料库 JX-S555(J) 2 (No. 70251) Safety 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 wri

4、ting 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 d

5、esign 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 charac

6、teristics 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

7、 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

8、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

9、. 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 re-assembling. 5. Leakage currnet check (Electrical shock hazard testing) After re-assembling the product, always perform an isolation check on

10、 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

11、 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

12、 method Plug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 ohms per volt or more sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by a 0.15 F AC-type capacitor between an exposed metal part and a known good earth ground. Measure the AC vo

13、ltage across the resistor with the AC voltmeter. Move the resistor connection to eachexposed metal part, particularly any exposed metal part having a return path to the chassis, and meausre the AC voltage across the resistor. Now, reverse the plug in the AC outlet and repeat each measurement. voltag

14、e measured Any must not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.). Warning 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. R

15、epairs 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. Good earth ground Place this probe on each exposed metal part. AC VOLTME

16、TER (Having 1000 ohms/volts, or more sensitivity) 1500 10W 0.15 F AC TYPE RadioFans.CN 收音机爱 好者资料库 (No. 70251) 3 JX-S555(J) Main Parts Locations AUDIO 2 boardAUDIO 1 board Front 1 board Bottom chassis Front panel assyFront 2 board Rear panel MAIN board Jack board Top cover JX-S555(J) 4 (No. 70251) Di

17、sassembly of Parts 2 17 6 11 18 17 17 5 14 14 16 22 9 8 15 21 22 20 13 19 12 7 4 3 4 1 15 (No. 70251) 5 JX-S555(J) Note : For the positions of the connectors, see the connection diagram (page 6). Removing the top cover 11111 1. Remove the two screws 3 retaining the top cover 1 from the rear panel 2,

18、 then remove the four screws 4 retaining the top cover from the side panels. 2. Slightly open out the bottoms of the side skirts I of the top cover 1 as shown in the figure, then pull the top cover straight upward II . Do not remove the top cover by pulling it up in an oblique direction. Removing th

19、e Audio 1 Board 55555 and Audio 2 Board 66666 1. Remove the top cover 1. 2. From the rear panel 2, remove the six screws 7 retaining the Audio 1 board 5 and the six screws 7 retaining the Audio 2 board 6. 3. Gently remove the Audio 1 board 5 and then unplug the connectors CN809 and CN810 from it. 4.

20、 Gently remove the Audio 2 board 6 and then unplug the connectors CN807 and CN808 from it. Removing the Main Board BBBBB 1. Remove the top cover 1, then the Audio 1 board 5 and finally the Audio 2 board 6. 2. From the rear panel 2, remove the nineteen screws C retaining the Main board B. 3. Unplug t

21、he connectors CN1, CN3, CN804 and CN811 (and the wire from the Front Panel Assembly D )on the Main board B . 4. Unplug the connector CN901 (in the power supply circuit) on the Main board B. 5. Remove the two clamping screws E on the Main board B. 6. Disengage the three claws of the locking card spac

22、er F on the Main board B, then remove the Main board by lifting it in an oblique direction. Removing the Rear Panel 22222 1. Remove the top cover 1. 2. Unplug the connector CN901 (in the power supply circuit) on the Main board B. 3. Remove the twelve screws 7 retaining the Audio 1 board 5 and the Au

23、dio 2 board 6, then remove the nineteen screws C retaining the Main board B. 4. Remove the three screws H retaining the bottom chassis G and the rear panel 2. 5. Gently remove the rear panel 2. (Take care of the AC power cord I connected to the rear panel 2.) Removing the Front Panel Assembly DDDDD

24、1. Remove the top cover 1. 2. Remove the three retaining screws J from the bottom of the Front Panel Assembly D. 3. Disengage the fittings between the side panels of the Front Panel Assembly D with the bottom chassis G, then gently pull out the Front Panel Assembly D from the bottom chassis G toward

25、 the front. 4. Unplug the connectors CN1, CN3, CN804 and CN811 from the Main board B. 5. Remove the Front Panel Assembly D. Removing the Front 1 Board KKKKK, Front 2 Board LLLLL and Jack Board 88888 1. Remove the top cover 1 and the Front Panel Assembly D. 2. Remove the two screws M retaining the Fr

26、ont 1 board K, five screws M retaining the Front 2 board L and the two screws 9 retaining the Jack board 8. 3. Remove the Front 1 board K, the Front 2 board L and the Jack board 8. II I I JX-S555(J) 6 (No. 70251) Connection Diagram CN702CN703CN101CN701 CN3 CN804 CN806CN805 CN807CN808CN810CN809 CN813

27、CN812 CN811 CN901 CN1 AUDIO 2 board Rear AUDIO 1 board MAIN board Front 1 boardFront 2 boardJack board Front (No. 70251) 7 JX-S555(J) Circuit Description 1. IC2 (PD780021ACWW01) The PD780021ACWW01 is a 64-pin, 8-bit single-chip microcomputer with an 8K-byte ROM and 512-byte RAM. Pin Name P40/AD0 P41

28、/AD1 P42/AD2 P43/AD3 P44/AD4 P45/AD5 P46/AD6 P47/AD7 P50/A8 P51/A9 P52/A10 P53/A11 P54/A12 P55/A13 P56/A14 P57/A15 Vss0 VDD0 P30 P31 Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Function Key scan inputs. Key scan outputs. Scan signal outputs for LED lighting. Dubbing lock ON/OFF. H = O

29、N. L = OFF. Scan signal outputs for LED lighting. CH1 INHIBIT ON/OFF. H = ON. L = OFF. Not used. Not used. Not used. Port grounding potential. Port positive potential. CH2 INHIBIT ON/OFF. H = ON. L = OFF. CH3 INHIBIT ON/OFF. H = ON. L = OFF. I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/

30、O I/O I I/O I/O I/O JX-S555(J) 8 (No. 70251) P32 P33 P34 P35 P36 P20/SI30 P21/SO30 P22/SCK30 P23/RxD0 P24/TxD0 P25/ASCK0 VDD1 AVss P17/AN17 P16/AN16 P15/AN15 P14/AN14 P13/AN13 P12/AN12 P11/AN11 P10/AN10 AVREF AVDD RESET XT2 XT1 IC X2 X1 Vss1 P00/INTP0 P01/INTP1 P02/INTP2 P03/INTP3/ADTRT P70/T100/TO0

31、 P71/TI01 P72/TI50/TO50 P73/TI51/TO51 P74/PCL P75/BUZ P64/RD P65/WR P66/WAIT P67/ASTB 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 I2C path Data signal. I2C path Clock signal Not used. Not used. Not used. Not used

32、. Not used. Not used. Not used. Not used. Not used. Positive potential (except for the port). AD converter grounding potential. Not used. Not used. Not used. Not used. Not used. Not used. CH5 S1/S2 signal input. Not used. A/D converter reference voltage input. Analog power supply for A/D converter S

33、ystem reset input. Sub-system clock oscillation. Internally connected. To be connected to VSS0 or VSS1. Xtal oscillator connection terminals for Main system clock oscillation. Grounding potential (except for the port). CH3 D4 plug insertion detection. CH4 D4 plug insertion detection. CH5 D4 plug ins

34、ertion detection. Not used. Remote control light signal input. Component video switching signal output. Component video switching signal output. Main unit ON/OFF. H = OFF. L = ON. S1/S2 signal inputs. Component video switching signal output. CH5 monitor signal output. Main unit ON/OFF. H = OFF. L =

35、ON. Power switch detection. I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I I I I I I I I I I I I I I I I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O I/O Pin NamePin No.FunctionI/O (No. 70251) 9 JX-S555(J) 2. M101, M102 (J46729-002) Comb filter module BufferVIDEO-INMatrix BPF 1H-GDL Buffer Buffe

36、r Y-OUT C-OUT Delay Line JX-S555(J) 10 (No. 70251) 3. IC101 (CXA2079Q) The CXA2079Q is an AV switcher IC with 5 video inputs, 2 video outputs, 5 stereo audio inputs and 2 stereo audio outputs, featuring the I2C bus compatibility for TV. Among the 5 video inputs, 4 inputs are compatible with the S2 a

37、nd S-Video standards. The outputs (each audio output uses a pair of lines for the L and R channels) can be selected independently by the control through the I2C bus. However, the second video and audio outputs are always based on the same video and audio input system. (No. 70251) 11 JX-S555(J) Adjus

38、tments Instruments required for adjustments 1. Oscilloscope 2. TV signal generator (NTSC) Connection NTSC color bar JX-S555 1CH V input 2CH C outputs Oscillo scope 1 2 Test PointAdjustment Point 2CH C output MONITOR OUT C output ConditionConditionName C output level C output level VR101 VR102 Apply

39、color bar signal to 1CH video input (V). Apply color bar signal to 1CH video input (V). Adjust VR101 so that the C output level at 2CH is 0.642 0.02 Vp-p. Adjust VR102 so that the C output level at MONITOR OUT is 0.642 0.02 Vp-p. JX-S555(J) 12 (No. 70251) MAIN board UPD780021ACW-W01 IC2 74HC04AP IC3

40、 NJM 4580D IC806 NJM 4580D IC802 74HC4066AP IC108 74HC4066AP IC107 74HC4066AP IC106 74HC4052AP IC402 74HC4052AP IC401 74HC4052AP IC808 74HC4052AP IC809 74HC126AP IC403 NJM 4580D IC801 NJM 4580D IC807 NJM 4580D IC805 NJM 4580D IC804 NJM 4580D IC803 74HC4066AP IC102 74HC4066AP IC104 74HC4066AP IC103 J

41、46729-002 M102 J46729-002 M101 IC101 VR102 VR101 CXA2079Q Position of ICs and Adjustment Points (No. 70251) 13 JX-S555(J) Servicing Guidelines 1. Reference input signals Video signals V Full-field color bar (white 100%), 1.0 Vp-p Y 1.0 Vp-p (with sync) C Burst level 0.286 Vp-p, chroma only Audio sig

42、nal 1 kHz, -10 dBV sine wave 2. YES Normal NO The normal voltage and waveform are not output. 1. Power cannot be turned ON. 2. Display LED lighting failure. C903: Across +/- leads?Approx. 164 V DCNO YES Check power cord and C901. If the fuse is blown, check Q901, T901, D901 and their surroundings. G

43、o to check ?. D906: Cathode D907: Anode ?+9.5 V DC 9.8 V DC NO YES NO R Check voltage at IC902 and surroundings.PC901 and IC902 may be defective. Go to check ?. Q904: Emitter, Q905: Emitter, Q906: Emitter, IC904: Pin 2 ?6 V DC +6 V DC +5 V DC +9 V DC NO YES IC901, IC903, IC904 or Q904 to Q906 defect

44、ive. Check CN1,. CN3 and wires. CN3: Pins 3 to 7?0 or +5 V DCNO YES IC2 defective. Q701 to Q706 or wire is defective. 3. Switch operation failure. CN3: Pins 8 to 140 or +5 V DCNO YES IC2 defective. CN701, tack switch or wire defective. ? 4. S/V switching failure IC101: Pins 7, 14, 21 and 28 0 V when

45、 S-Video plug is inserted. +5 V when S-Video plug is not inserted. NO YES PJ107 to PJ110 defective. Check IC101 and the surroundings. ? 5. Remote control malfunction IC2: Pin 55+ 5 V DC at remote control code (See TM.) NO YES IC701, CN1, CN702 or wire defective. IC2 defective. ? 6. The composite vid

46、eo inputs at CH1 and CH2 are not displayed. ? Q135: EmitterNO YES Go to check ?. Check Q152, Q161, Q170 and their surroundings. 7. The composite video inputs at CH1 and CH2 are not output at the Monitor output. Q129: EmitterNO YES Go to check ?. Check IC106, output buffer and their surroundings. Q10

47、7: emitterNO YES Check IC101 and surroundings. Check IC103 and their surroundings. ? ? SymptomCheck PointsNormal Voltage/WaveformCheck Results and Failures 2.0 Vp-p Q115: EmitterNO YES Check IC101 and surroundings. Check IC103 and their surroundings. ? 2.0 Vp-p 2.0 Vp-p 2.0 Vp-p JX-S555(J) 14 (No. 7

48、0251) 8. The S-Video inputs at CH1 to CH4 are not displayed. (Y) Q131: Emitter (C) Q133: Emitter ?(Y) (C) (Y) (C) NO YES Go to check ?. Check IC107, IC108, output buffer and their surroundings. (Y) Q108: Emitter (C) Q109: Emitter ?NO YES Check IC101 and surroundings. Check IC102, IC104 and their surroundings. SymptomCheck Results and Failures (Y) Q110: Emitter (C) Q111: Emitter NO YES Check IC101 and surroundings. Check IC102, IC104 and their surroundings. ? 10. The S-Video input at CH5 is not displayed. (Y) Q104: Emitter (C) Q102: Em