JVC-JXS555-avs-sm 维修电路原理图.pdf

SERVICE MANUALAV SELECTORNo.70251Mar. 2001COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD.Printed in Japan0103(S)VICTOR COMPANY OF JAPAN, LIMITEDCOMMUNICATION NETWORK BUSINESS UNIT, 1644, SHIMOTSURUMA, YAMATO-SHI, KANAGAWA-KEN, 242-8514, JAPANJX-S555 (J) No.70251JX-S555(J)JX-S555(J)JX-S555(J)No. 70251ContentsSafety Precautions .2Main Parts Locations .3Disassembly of Parts .4Connection Diagram . 6Circuit Description . 7Adjustments . 11Position of ICs and Adjustment Points . 12Servicing Guidelines . 13Block View Inside IC . 17Design and specifications are subject to change without notice.RadioFans.CN 收音机爱 好者资料库JX-S555(J)2 (No. 70251)Safety Precautions1. 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 re-assembling.5. Leakage currnet check (Electrical shock hazard testing)After re-assembling 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 methodPlug 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 voltage 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. voltage measured Any must not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.). Warning1. 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.Good earth groundPlace this probe on each exposedmetal part.AC VOLTMETER(Having 1000 ohms/volts,or more sensitivity)1500 10W0.15 F AC TYPERadioFans.CN 收音机爱 好者资料库 (No. 70251) 3JX-S555(J)Main Parts LocationsAUDIO 2 boardAUDIO 1 boardFront 1 boardBottom chassisFront panel assyFront 2 boardRear panelMAIN boardJack boardTop coverJX-S555(J)4 (No. 70251)Disassembly of Parts21761118171751414162298152122201319127434115 (No. 70251) 5JX-S555(J)Note : For the positions of the connectors, see the connectiondiagram (page 6).Removing the top cover 111111. Remove the two screws 3 retaining the top cover 1 from therear panel 2, then remove the four screws 4 retaining thetop cover from the side panels.2. Slightly open out the bottoms of the side skirts I of the topcover 1 as shown in the figure, then pull the top cover straightupward II . Do not remove the top cover by pulling it up in anoblique direction.Removing the Audio 1 Board 55555 and Audio 2Board 666661. 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 theAudio 2 board 6.3. Gently remove the Audio 1 board 5 and then unplug the connectors CN809 and CN810 from it.4. Gently remove the Audio 2 board 6 and then unplug the connectors CN807 and CN808 from it.Removing the Main Board BBBBB1. 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 the connectors CN1, CN3, CN804 and CN811 (and the wire from the Front Panel Assembly D )on the Mainboard 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 spacer F on the Main board B, then remove the Main board by liftingit in an oblique direction.Removing the Rear Panel 222221. 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 Audio 2 board 6, then remove the nineteen screwsC 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 DDDDD1. 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, thengently pull out the Front Panel Assembly D from the bottom chassis G toward 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 888881. Remove the top cover 1 and the Front Panel Assembly D.2. Remove the two screws M retaining the Front 1 board K, five screws M retaining the Front 2 board L and the two screws9 retaining the Jack board 8.3. Remove the Front 1 board K, the Front 2 board L and the Jack board 8.IIIIJX-S555(J)6 (No. 70251)Connection DiagramCN702CN703CN101CN701CN3CN804CN806CN805CN807CN808CN810CN809CN813CN812CN811CN901CN1AUDIO 2 boardRearAUDIO 1 boardMAIN boardFront 1 boardFront 2 boardJack boardFront (No. 70251) 7JX-S555(J)Circuit Description1. IC2 (PD780021ACWW01)The PD780021ACWW01 is a 64-pin, 8-bit single-chip microcomputer with an 8K-byte ROM and 512-byte RAM.Pin NameP40/AD0P41/AD1P42/AD2P43/AD3P44/AD4P45/AD5P46/AD6P47/AD7P50/A8P51/A9P52/A10P53/A11P54/A12P55/A13P56/A14P57/A15Vss0VDD0P30P31Pin No.1234567891011121314151617181920FunctionKey scan inputs.Key scan outputs.Scan signal outputs for LED lighting.Dubbing lock ON/OFF. H = ON. 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/OI/OI/OI/OI/OI/OI/OI/OI/OI/OI/OI/OI/OI/OI/OI/OII/OI/OI/OJX-S555(J)8 (No. 70251)P32P33P34P35P36P20/SI30P21/SO30P22/SCK30P23/RxD0P24/TxD0P25/ASCK0VDD1AVssP17/AN17P16/AN16P15/AN15P14/AN14P13/AN13P12/AN12P11/AN11P10/AN10AVREFAVDDRESETXT2XT1ICX2X1Vss1P00/INTP0P01/INTP1P02/INTP2P03/INTP3/ADTRTP70/T100/TO0P71/TI01P72/TI50/TO50P73/TI51/TO51P74/PCLP75/BUZP64/RDP65/WRP66/WAITP67/ASTB2122232425262728293031323334353637383940414243444546474849505152535455565758596061626364I2C path Data signal.I2C path Clock signalNot used.Not used.Not used.Not used.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 converterSystem reset input.Sub-system clock oscillation.Internally connected. To be connected to VSS0 or VSS1.Xtal oscillator connection terminals for Mainsystem clock oscillation.Grounding potential (except for the port).CH3 D4 plug insertion detection.CH4 D4 plug insertion detection.CH5 D4 plug insertion 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 = ON.Power switch detection.I/OI/OI/OI/OI/OI/OI/OI/OI/OI/OI/OIIIIIIIIIIIIIIII/OI/OI/OI/OI/OI/OI/OI/OI/OI/OI/OI/OI/OI/OPin NamePin No.FunctionI/O (No. 70251) 9JX-S555(J)2. M101, M102 (J46729-002) Comb filter moduleBufferVIDEO-INMatrixBPF1H-GDLBufferBufferY-OUTC-OUTDelayLineJX-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 and S-Videostandards.The outputs (each audio output uses a pair of lines for the L and R channels) can be selected independently by the controlthrough the I2C bus. However, the second video and audio outputs are always based on the same video and audio inputsystem. (No. 70251) 11JX-S555(J)AdjustmentsInstruments required for adjustments1. Oscilloscope2. TV signal generator (NTSC)ConnectionNTSCcolor barJX-S5551CHV input2CHC outputsOscilloscope12Test PointAdjustment Point2CH C outputMONITOR OUT C outputConditionConditionNameC output levelC output levelVR101VR102Apply color bar signal to1CH 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 boardUPD780021ACW-W01IC274HC04APIC3NJM4580DIC806NJM4580DIC80274HC4066APIC10874HC4066APIC10774HC4066APIC10674HC4052APIC40274HC4052APIC40174HC4052APIC80874HC4052APIC80974HC126APIC403NJM4580DIC801NJM4580DIC807NJM4580DIC805NJM4580DIC804NJM4580DIC80374HC4066APIC10274HC4066APIC10474HC4066APIC103J46729-002M102J46729-002M101IC101VR102VR101CXA2079QPosition of ICs and Adjustment Points (No. 70251) 13JX-S555(J)Servicing Guidelines1. Reference input signalsVideo signalsV Full-field color bar (white 100%), 1.0 Vp-pY 1.0 Vp-p (with sync)C Burst level 0.286 Vp-p, chroma onlyAudio signal1 kHz, -10 dBV sine wave2. YES NormalNO 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.Go to check ?.D906: CathodeD907: Anode?+9.5 V DC9.8 V DCNO YESNO 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 DCNO YES IC901, IC903, IC904 or Q904 to Q906 defective.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 failureIC101: Pins 7, 14, 21 and 28 0 V when 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 malfunctionIC2: Pin 55+ 5 V DC at remote control code (See TM.)NO YES IC701, CN1, CN702 or wire defective.IC2 defective.?6. The composite video 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.Q107: emitterNO YES Check IC101 and surroundings.Check IC103 and their surroundings.?SymptomCheck PointsNormal Voltage/WaveformCheck Results and Failures2.0 Vp-pQ115: EmitterNO YES Check IC101 and surroundings.Check IC103 and their surroundings.?2.0 Vp-p2.0 Vp-p2.0 Vp-pJX-S555(J)14 (No. 70251)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: EmitterNO 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: EmitterNO YES Check Q101 to Q104, Q119, Q120 and their surroundings.Go to check ?.?2.0 Vp-p1.28 Vp-p(Y)(C)2.0 Vp-p1.28 Vp-p(Y)(C)2.0 Vp-p1.28 Vp-p9. The S-Video inputs at CH1 to CH4 are not output at the Monitor output.(Y) Q137: Emitter(C) Q139: Emitter?(Y)(C)NO YESGo to check ?.Check output buffer and surroundings.2.0 Vp-p1.28 Vp-p2.0 Vp-p1.28 Vp-pCheck PointsNormal Voltage/Waveform (No. 70251) 15JX-S555(J)11. The S-Video input at CH5 is not output at the Monitor output.(Y) Q104: Emitter(C) Q102: Emitter?(Y)(C)(Y)(C)NO YES Check Q101 to Q104, Q119, Q120 and their surroundings.Go to check ?.(Y) Q114: Emitter(C) Q113: Emitter?NO YES Go to check ?.Check IC101 and surroundings.SymptomCheck Results and Failures12. Malfunction in Y/C separation.2.0 Vp-p1.28 Vp-p2.0 Vp-p1.28 Vp-p(Y)(C)(Y) M101: Pin 5(C) M101: Pin 3?NO YES M101 defective.Check Q112 to Q114, Q173, Q174 and their surroundings.1.0 Vp-p0.64 Vp-p(Y)(C)(Y) Q118: Emitter(C) Q117: Emitter?NO YES Go to check