NAD-T531-cd-sm(1) 维修电路原理图.pdf

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1、CONTENTSSECTION 1 . . . .SUMMARYSECTION 2 . . . .CABINET & MAIN CHASSISSECTION 3 . . . .ELECTRICALSECTION 4 . . . .MECHANISMSECTION 5 . . . .REPLACEMENT PARTS LISTRadioFans.CN 收音机爱 好者资料库SECTION 1SUMMARYCONTENTSPRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS. 1-3SERVICING PRECAUTIONS. 1-4 Gene

2、ral Servicing Precautions Insulation Checking Prodedure Electrostatically Sensitive DevicesSPECIFICATIONS. 1-5RadioFans.CN 收音机爱 好者资料库1-3Prior to shipment from the factory, the products are strictly inspected to conform with the recognized productsafety and electrical codes of the countries in which

3、they are to be sold. However, in order to maintain such com-pliance, it is equally important to implement the following precautions when a set is being serviced. Precautions during Servicing1. Locations requiring special caution are denoted by labels and inscriptions on the cabinet, chassis andcerta

4、in parts of the product. When performing service, be sure to read and comply with these and othercautionary notices appearing in the operation and service manuals.2. Parts identified by the symbol and shaded ( Y) parts are critical for safety.Replace only with specified part numbers.Note : Parts in

5、this category also include those specified to comply with X-ray emission standards forproducts using cathode ray tubes and those specified for compliance with various regulationsregarding spurious radiation emission.3. Use Specified internal wiring. Note especially:1) Double insulated wires2) High v

6、oltage leads4. Use specified insulating materials for hazardous live parts. Note especially:1) Insulation Tape2) PVC tubing3) Spacers4) Insulation sheets for transistor5. Observe that wires do not contact heat producingparts (heatsinks, oxide metal film resistors, fusibleresistors, etc.)6. Check tha

7、t replaced wires do not contact sharp edged or pointed parts.7. 1) When a power cord has been replaced, checkthat A mark is made on the cord, under strain, near the aperture, and the flexible cord issubjected 100 times to a pull of 40N for a duration of 1 second each.2) During the test, the cord sha

8、ll not be displaced by more than 2mm8. Also check areas surrounding repaired locations.IMPORTANT SAFETY PRECAUTIONSFig. 1Power cord1-4Fig. 3SAFETY CHECK AFTER SERVICINGExamine the area surrounding the repaired location for damage or deterioration. Observe that screws, parts andwires have been return

9、ed to original positions. Afterwards, perform the following tests and confirm the specifiedvalues in order to verify compliance with safety standards. Insulation resistance testconfirm the specified insulation resistance or greater between power cord plug prongs and externally exposedparts of the se

10、t (RF terminals, antenna terminals, video and audio input and output terminals, microphonejacks, earphone jacks, etc.) See table below. Dielectric strength testConfirm specified dielectric strength or greater between power cord prongs and exposed accessible parts ofthe set (RF terminals, antenna ter

11、minals, video andaudio input and output terminals, microphone jacks,earphone jacks, etc.) See table below. Clearance distanceWhen replacing primary circuit components, confirmspecified clearance distance (d), (d) between sol-dered terminals, and between terminals and sur-rounding metallic parts. See

12、 table below.Table 1 : Ratings for selected areas* Class II model only.Note. This table is unofficial and for reference only. Be sure to confirm the precise values for your particular country and locality. Leakage Current testConfirm specified or lower leakage current between B(earth ground, power c

13、ord plug prongs) and externally exposed accessible parts (RF terminals, antenna terminals, video and audio input and output terminals, micro-phone jacks, earphone jacks, etc.)Measuring Method: (Power ON)Insert load Z between B(earth ground, power cord plug prongs) and exposed accessible parts. Use a

14、n AC voltmeter to measure across both terminals of load Z. See figure and following table.Table 2:Leakage current ratings for selected areas.Note. This table is for IEC member only. Be sure to confirm the precise values for your particular country andNote. locality.ChassisdaPrimary circuit terminals

15、ExposedaccessiblepartZLoadAC VoltmeterEarth Ground,Power cord plug prongsBFig. 2AC Line VoltageAC Line Voltage100 to 130 V200 to 240 V*100 to 130 V*200 to 240 VAustraliaEuropeAustraliaEuropeOther terminalsAntenna earthterminalsi E 0.7m A peaki E 2m A DCi E 0.7m A peaki E 2m A DCF 10 M/500 V DC4kV 1

16、minuteF 6mm(d)F 8mm(d)(a Power cord) RegionLoad ZLeakage Current(i)Earth Ground(B) to :RegionInsulationResistanceDielectricStrengthClearanceDistance(d),(d)2k50k1-5SPECIFICATIONSDVD VIDEO PLAYERPower supplyAC 110240V, 50/60Hz(T531B, T531C)AC 120V, 60Hz(T531AH)Power consumtion16WMass3.0kg(6.6lbs) Exte

17、rnal dimensions435 x 88 x 247 mm (W x H x D)Signal systemPAL 625/50, NTSC 525/60LaserSemiconductor laser, wavelength 650nmFrequency range (digital audio)4Hz to 20kHzSignal-to-noise ratio (digital audio)More than 100dB (EIAJ)Audio dynamic range (digital audio)More than 95dB (EIAJ)Harmonic distortion(

18、digital audio)0.008%Wow and flutterBelow measurable level (less than +0.001%(W.PEAK) (EIAJ)OperationsTemperature : 5C(41F) to 35C(95F),Operation status : HorizontalOUTPUTSVideo outputs1.0V(p-p), 75, negative sync., RCA jack x 1/SCART(TO TV) (T531C ONLY)S video outputs(Y)1.0V(p-p), 75, negative sync.

19、,Mini DIN 4-pin x 1(C)0.286V(p-p), 75Audio output(digital audio)0.5V(p-p), 75, RCA jack X 1Audio output(optical audio)Optical connector x 1Audio output(analog audio)2.0Vrms (1kHz, 0dB), 330, RCA jack (L, R) x 1/SCART(TO TV) (T531C ONLY)*Designs and specifications are subject to change without notice

20、.*Weight and dimensions shown are approximate.2-1SECTION 2CABINET & MAIN CHASSISCONTENTS1. DISASSEMBLY.2-2CABINET DISASSEMBLY .2-2CIRCUIT BOARD DISASSEMBLY .2-32. EXPLODED VIEWS.2-41. Cabinet and Main Frame Section.2-42. Packing Accessory Section.2-62-2DISASSEMBLYCAUTION BEFORE STARTING SERVICINGEle

21、ctronic parts are susceptible to static electricity and may easily and damaged, so do not forget to take aproper grounding treatment as required.Many screws are used inside the unit. To prevent missing, dropping, etc. of the screws, always use amagnetized screw driver in servicing. Several kinds of

22、screws are used and some of them need specialcautions. That is, take care of the tapping screws securing molded parts and fine pitch screws used to securemetal parts. If they are used improperly, the screw holes will be easily damaged and the parts can not be fixed.Top Case(A)(A)(A)(A)(A)(A)(A)Tray

23、DoorDisc TrayFront PanelStopperStopper(B)CABINET DISASSEMBLY1. Top Case1. Release 7 screws (A). (See Fig. 2-1)2. Lift the top case with holding the back of it,and remove it in the direction of the arrowFig. 2-1Fig. 2-2Fig. 2-33. Front Panel1. Eject the disc tray. (See Fig. 2-2)2. Remove the tray doo

24、r. (See Fig. 2-2)3. Release 2 screws (B).4. Pull the front panel toward you while pressing7 stoppers to disengage, and remove the frontpanel. (See Fig. 2-3)2.Tray Door1.Eject the disc tray. 2.Lift up the tray door in the direction of thearrow.2-3Main Circuit Board(C)(C)(C)(C)(C)(C)(C)(C)(C)(C)(C)(C)

25、Power CodeInterfaceBoard(D)(D)ScartKeyCircuit Board(E)(E)(E)(E)(5, 6, 7 TOOL ONLY)Fig. 2-4Fig. 2-51. Disassembling of Main Circuit Boardand Interface Board1. Remove the top case.(See Fig. 2-1)2. Remove 12 screw (C).3. Remove the deck from Main Circuit Board.4. Remove Main Circuit Board from Interfac

26、e Board.5. Remove 2 screw (D). 6. Remove Interface Board from the chassis.CIRCUIT BOARD DISASSEMBLYNote: Before removing the main circuit board, be sure to shortcircuit the laserdiode output land.After replacing the main circuit board, open the land after inserting the flexible connector.(Refer to M

27、echanism Disassembly)2. Digitron and Key Circuit Board 1. Remove the front panel.(See Fig. 2-3)2. Release 4 screws (E), and remove the digitron circuit board.2-4EXPLODED VIEWS1. Cabinet and Main Frame Section280465467465465463A46463463275332PBP00PBT00283260467300467A48A43250462462463463452452285OPTI

28、ONAL PARTScartA54321BCD2-52.Packing Accessory SectionBATTERY808PACKING SHEET804PACKINGOPTIONAL PARTS803806OWNERS MANUALRF CABLE810 CABLE SET ASSY801REMOCON900BOX CARTON802PACKING803811812PLUG ASSY 1WAYPLUG ASSY 2WAY3-1SECTION 3ELECTRICALCONTENTSELECTRICAL TROUBLESHOOTING GUIDE.3-21. Power(SMPS) Circ

29、uit.3-22. -com Circuit.3-33. MPEG Circuit.3-64. Front Circuit(Digitron & Key) .3-75. RF/Servo Circuit .3-8BLOCK DIAGRAMS.3-121. Overall Block Diagram.3-122. Power (SMPS) Block Diagram.3-143. RF/CD DSP/DVD DSP/DVD servo Block Diagram .3-184. Audio Block Diagram.3-195. MPEG Block Diagram.3-176. -COM B

30、lock Diagram.3-18CIRCUIT DIAGRAMS.3-191. Power (SMPS) Circuit Diagram .3-192. DVD DSP Circuit Diagram.3-233. Drive & RF Circuit Diagram .3-254. MPEG Circuit Diagram .3-275. Audio DM Circuit Diagram.3-296. -COM/Expander.3-317. DIGITRON & Key Circuit Diagram.3-338. Scart Circuit Diagram.3-359. Jack Ci

31、rcuit Diagram.3-37 CIRCUIT VOLTAGE CHART .3-39 WAVEFORMS .3-45PRINTED CIRCUIT DIAGRAMS.3-471. MAIN P.C.BOARD.3-472. POWER, A/V, FRONT P.C.BOARD .3-493. KEY P.C.BOARD.3-51 4. POWER LED P.C.BOARD .3-513-2ELECTRICAL TROUBLESHOOTING GUIDENo 5V_Dor 5V_A .No 5.2VA.Is 5.2VA section working?Is oscillation p

32、resent at theBase of Q108?Replace Q108.Check L103, C116.Replace R111.Replace BD101.(Bridge rectifier)Check Fuse(F101).Is R111 1?Check D105.Replace Q101, 102.Is 5.2V applied to IC108Pin 1?Is there a DC voltage at the(+) terminal of BD101?Check R127, 128.(SHUTDOWN CKT) 1. Power(SMPS) CircuitNo VF+Is 5

33、.2VA section working?Replace D109.Is oscillation present at theanode of D109?NONONONOYESYESYESYESYESYESYESYESA.B.NONONO3-3Replace IC506.Refer to Front PartCheck shortReconnect it.2. -COM CircuitA. No PowerDoes Logo appearon the screen?Is oscillation ofX501 normal?Are IC503 Pins 14, 288and 29 normal?

34、Does no DISC appear?Does Helloappear at FLD?Is P5901connected normally?Is P5901 Pin 23 normal?Thewaveform on A00:21and D00:15 of IC501normal?Are IC506 Pins 7, 8 normal?Replace Main B/D.Check the oscillationCheck short.OKReplace IC501or IC503.Check power.(Refer to power)If power isnormalOKPOWER ON11Y

35、ESYESYESYESYESYESYESYESANONONONONONONONONONOA3-4B. Audio abnormalD. Open/Close abnormalCheck theconnection of P5901.Check IC501 Pins 13, 14.Check Audio jack.YES (If OK)YESNONOYESYES (If OK)YESYES (If OK)YES (If OK)YES (If OK)Check MPEG_CLK Signalof MPEG part.Refer to Audio part.Refer to MPEG part.Re

36、place B/D.Check Front.Reconnect it.Refer to SERVO part.Check the connection of MD.AUDIO ABNORMALOPEN/CLOSE ABNORMALC. Video abnormalCheck Video jack.YES (If OK)YES (If OK)YES (If OK)YES (If OK)Refer to Video part.Refer to Encoder part.Refer to MPEG part.Replace B/D.VIDEO ABNORMAL3-5E. Picture abnorm

37、alCheck the disc.If OKYES (If OK)YES (If OK)Refer to Servo partCheck MPEG_CLK Signalof MPEG partCheck DSPCheck MPEGYES (If OK)Replace B/DPICTURE ABNORMALF. Disc ErrorCheck DiscYES (If OK)YES (If OK)Refer to Servo partReplace B/DDISC ERROR3-6Power is onDoes Logo appearon the screen?Does themoving pic

38、ture of the DVD Discplay on the screennormally?Is MPEG data signal normal?Is error signal normal?Is MPEG data signal normal?Is Clock normal?Does the audiosound output from MPEGdecoder?Does themoving picture of the videoCD play on the screennormally?Does the audio soundoutput normally?ENDCheck power

39、& clock.Check CD/DVD DSP outputsignal.Check MPEG Decoder inputsignal.Check CD/DVD DSP outputsignal.Check MPEG Decoder inputsignal.Check CD/DVD DSP outputsignal.Check MPEG Decoder inputsignal.Check clock signalCheck clock signalYESYESYESYESYESYESYESYESYESYESNONONOOKOKOKOKNONONONONO3. MPEG Circuit _ O

40、PTION_ If included VCD function.3-7NONONOSTARTDoes remote controlwork normally?Do all thebuttons worknormally?Check waveform ofIC901 Pin 22.Check waveformof IC901 Pin 26, 27.Is Digitron on normally?LED ON?Check waveformof IC901 Pin 6.Is oscillation ofX901 normal?Is waveform of IC901Pin 40 normal?Che

41、ck waveformof IC901 Pin 22.Does pulsewaveform of RC901 Pin 1appear?Is IC901Pin 17 connected toRC901 Pin 1 ?Is RC901 Pin 2 5V?Power on.Check and replaceR903,R912, R904, R905,R941, R906, R907.Solder defective parts again.Solder defective partsReplace IC901.Solder Key part.Check Power.Replace IC902.Rep

42、lace IC901.Replace LED901.Replace RC901.Re-solder.RecheckReplace IC901.Complete repairing Front B/D.NONONONONONONONONOYESYESYESYESYESYESYESYESYESYESYESYESYESYESYESYESCD4. Front Circuit (Digitron & key)3-8Does signal pulseinput to IC201 Pins 58, 59 whenthe power is on?Does signal goesHigh to IC201 Pi

43、n194 when thepower is on?DoesTTL pulse output toIC201 Pins 140, 142?Does33.8688MHz clock inputto IC201 Pin 63?Is IC201Pins 83, 84, 88, 89 voltageabout 2.2V?Replace IC201(IC206 soldering or IC defect).Check power circuit.Check 2.-COM Part.Replace X301 or IC304(30MHz clock defect)CHECK POINT(General)5

44、. RF/Servo CircuitA.ENDNONONONONOYESYESYESYESYES3-9Does tray open or close?Does the pick-upslide inner or outertrack?Fig.1. SLED Driver waveformFig.2. Focus Driver waveformDoesthe voltage changeat PMD03 Pins 1, 3 more than2V on the basis of3.8V?Pressingthe open/close keyrepeatedly, check the voltage

45、 of IC2M1Pins 22 change0V to 5VDoesPMD03 Pin 13 changehigh to low?Doesthe pick-up lens move upand down?Check Focus Driver output.(IC201 Pin 83, IC2M1 Pins 32, 33)Check SLED Driver output.IC201 Pin 88 IC2M1 Pins 35, 36.IC201 Pin 88 no output : IC201 is defectiveIC2M1 Pin 19 no output : IC2M1 is defec

46、tiveIC201 Pin 83 no output : IC201 is defectiveIC2M1 Pins 24, 41 no output : IC2M1 is defectiveDECK assembly is defective.Slide the pick-up toinner track.Power onCheck loading Part.Push Pick-up to inner track tothe end by hand.DECK assembly is defective.(Limit sw)check -COM Part.Replace IC2M1.No dis

47、cB.ENDNONONONONONOYESYESYESYESYESYES3-10FOCUS ON?Checkthe focus error moving thelens up and down.(IC2A1 Pin 42)Does theTTL level change at IC201Pin 78 and 132 movingthe lens?Does the disc turn?IC201 Pin169 is High?Is OK the track jump.Does the signalpulse appear at IC2A1 Pins39, 29?Does the screen a

48、ppear?OPEN/CLOSEReplace -COM or IC201.Replace IC201.Check IC2A1 Pin 11,12,13,14in DVD ModeFig.3. FOCUS ERROR waveformIC201 no output : Pick-up is defective.Check IC201 and IC2M1 when PMD03 Pin 6 is abnormalCheck IC2M1 Pin 18, PMD03Pin 6 turn when the IC2M1 Pin 21 is less than 2.2V.Check AVideo Part

49、is defective.Check 5.MPEG Circuit.Check 7.OSD/Video Circuit.Replace -COM part.IC2A1 is defective.DISC INC.ENDNONONONONONONONOYESYESYESYESYESYESYESYES3-11Is the eye-pattern vivid?Does the sawtooth waveform emitat IC2A1 Pin 41?Does the 1.6V emit?Check RF Eye-Pattern. RF : 1.5-1.6V(IC2A1 Pin 57)Fig.5.

50、RFwaveformCheck IC2A1 Pins 5, 6, 7, 8.No signal: Pick-up is defectiveReplace IC201.Check IC201 Pin84.No signal at IC201 : IC201 is defective Check IC201 Pin 162. Check the clock at the IC201 Pins 28, 30. Both are normal : IC201 is defectiveReplace IC2A1.CHECK AD.ENDNONONONOYESYESYESYES3-12BLOCK DIAG