LG-FFH976-cs-sp 维修电路原理图.pdf

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1、- 1-2 -SECTION 1. GENERALSERVICING PRECAUTIONSNOTES REGARDING HANDLING OF THE PICK-UP1. Notes for transport and storage1) The pick-up should always be left in its conductive bag until immediately prior to use.2) The pick-up should never be subjected to external pressure or impact.2. Repair notes1) T

2、he pick-up incorporates a strong magnet, and so should never be brought close to magnetic materials.2) The pick-up should always be handled correctly and carefully, taking care to avoid external pressure andimpact. If it is subjected to strong pressure or impact, the result may be an operational mal

3、function and/ordamage to the printed-circuit board.3) Each and every pick-up is already individually adjusted to a high degree of precision, and for that reasonthe adjustment point and installation screws should absolutely never be touched.4) Laser beams may damage the eyes!Absolutely never permit l

4、aser beams to enter the eyes!Also NEVER switch ON the power to the laser output part (lens, etc.) of the pick-up if it is damaged.5) Cleaning the lens surfaceIf there is dust on the lens surface, the dust should be cleaned away by using an air bush (such as usedfor camera lens). The lens is held by

5、a delicate spring. When cleaning the lens surface, therefore, acotton swab should be used, taking care not to distort this.6) Never attempt to disassemble the pick-up.Spring by excess pressure. If the lens is extremely dirty, apply isopropyl alcohol to the cotton swab. (Donot use any other liquid cl

6、eaners, because they will damage the lens.) Take care not to use too much ofthis alcohol on the swab, and do not allow the alcohol to get inside the pick-up.Storage in conductive bagDrop impactNEVER look directly at the laser beam, and dont letcontact fingers or other exposed skin.MagnetHow to hold

7、the pick-upaPressurePressureCotton swabConductive SheetRadioFans.CN 收音机爱 好者资料库- 1-3 -NOTES REGARDING COMPACT DISC PLAYER REPAIRS 1. Preparations1) Compact disc players incorporate a great many ICs as well as the pick-up (laser diode). Thesecomponents are sensitive to, and easily affected by, static

8、electricity. If such static electricity is highvoltage, components can be damaged, and for that reason components should be handled with care.2) The pick-up is composed of many optical components and other high-precision components. Care mustbe taken, therefore, to avoid repair or storage where the

9、temperature of humidity is high, where strongmagnetism is present, or where there is excessive dust.2. Notes for repair1) Before replacing a component part, first disconnect the power supply lead wire from the unit2) All equipment, measuring instruments and tools must be grounded.3) The workbench sh

10、ould be covered with a conductive sheet and grounded.When removing the laser pick-up from its conductive bag, do not place the pick-up on the bag. (This isbecause there is the possibility of damage by static electricity.)4) To prevent AC leakage, the metal part of the soldering iron should be ground

11、ed.5) Workers should be grounded by an armband (1M)6) Care should be taken not to permit the laser pick-up to come in contact with clothing, in order to preventstatic electricity changes in the clothing to escape from the armband.7) The laser beam from the pick-up should NEVER be directly facing the

12、 eyes or bare skin.CLEARING MALFUNCTIONYou can reset your unit to initial status if malfunction occur(button malfunction, display, etc.).Using a pointed good conductor(such as driver), simply short the RESET jump wire on the inside of thevolume knob for more than 3 seconds. If you reset your unit, y

13、ou must reenter all its settings(stations, clock, timer)NOTE: 1. To operate the RESET jump wire, pull the volume rotary knob and release it.2. If you wish to operate the RESET jump wire, it is necessary to unplug the power cord.ArmbandConductiveSheetResistor(1 Mohm)Resistor(1 Mohm)VOLUME KNOBUPDOWNV

14、OLUMERESET jump wireRadioFans.CN 收音机爱 好者资料库ESD PRECAUTIONSElectrostatically Sensitive Devices (ESD)Some semiconductor (solid state) devices can be damaged easily by static electricity. Such componentscommonly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are i

15、ntegratedcircuits and some field-effect transistors and semiconductor chip components. The following techniques shouldbe used to help reduce the incidence of component damage caused by static electricity.1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, d

16、rain offany electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear acommercially available discharging wrist strap device, which should be removed for potential shock reasonsprior to applying power to the unit under test.2. After removing an electrical ass

17、embly equipped with ESD devices, place the assembly on a conductivesurface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.3. Use only a grounded-tip soldering iron to solder or unsolder ESD devices.4. Use only an anti-static solder removal device. Some sol

18、der removal devices not classified as anti-static cangenerate electrical charges sufficient to damage ESD devices.5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ESDdevices.6. Do not remove a replacement ESD device from its protective package until

19、 immediately before you areready to install it. (Most replacement ESD devices are packaged with leads electrically shorted together byconductive foam, aluminum foil or comparable conductive materials).7. Immediately before removing the protective material from the leads of a replacement ESD device,

20、touch theprotective material to the chassis or circuit assembly into which the device will by installed.CAUTION : BE SURE NO POWER IS APPLIED TO THE CHASSIS OR CIRCUIT, AND OBSERVE ALL OTHERSAFETY PRECAUTIONS.8. Minimize bodily motions when handing unpackaged replacement ESD devices. (Otherwise harm

21、less motionsuch as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor cangenerate static electricity sufficient to damage an ESD device).- 1-4 - 1-5 -SPECIFICATIONS1. AMP SECTION1) Power Output (6 , 2 channel, T.H.D. 10%) .30W+30W 120W+120W2) T.H.D 0.2% .0

22、.2% 1.0%3) Frequency Response (-3dB down) .700Hz25kHz 45Hz700Hz4) Signal-to-noise Ratio .85dB 75dB5) Input Sensitivity AUX .40050mV 40050mV6) Channel Difference 1kHz .2dB-2. TUNER SECTION1) FM/OIRT1) Frequency Range . 87.5MHz108MHzor 65.0MHz74.0MHz & 87.5MHz108MHz2) Intermediate Frequency. 10.7MHz3)

23、 Sensitivity (70MHz/78.6MHz/83.0MHz/86.6MHz/90MHz/98MHz). 12dB4) Signal-to-noise Ratio 98.1MHz(Mono/Stereo). 61dB/58dB5) Image Rejection 106.1MHz. 20dB6) IF Rejection 90.1MHz . 65dB7) Distortion 98.1MHz(Mono/Stereo). 1.2/1.2%8) Frequency Response (-3dB) . 60Hz10kHz9) Stereo Separation (100Hz/1kHz/10

24、kHz). 23dB2) AM(MW)1) Frequency Range . 522kHz1611kHz/530kHz1610kHz/530kHz1720kHz2) Intermediate Frequency. 450kHz3) Usable Sensitivity. 55dB4) Image Rejection (1404kHz) . 25dB5) IF Rejection (603kHz). 40dB6) Selectivity (1008kHz). 23dB7) Signal-to-noise Ratio (1008kHz). 35dB8) Distortion (1008kHz)

25、. 1.5%9) Frequency Response (1008kHz). 100Hz1800Hz3) SW(OPTIONAL)1) Frequency Range. 5.8MHz18MHz2) Intermediate Frequency. 450kHz3) Usable Sensitivity. 40dB4) Signal To Noise Ratio. 35dB5) Distortion . 3%4) LW(OPTIONAL)1) Frequency Range . 153kHz281kHz2) Intermediate Frequency. 450kHz3) Usable Sensi

26、tivity. 65dB4) Signal To Noise Ratio (200kHz). 28dB5) Distortion (200kHz) . 3%Main Super Woofer- 1-6 -3. TAPE DECK SECTION1) Tape Speed (MTT-111) / Normal Speed . 4.75(+2%, -1%)cm/sec2) Wow Flutter (MTT-111) . 0.25%3) Fast Forward and Rewind Time (C-60) . 120sec4) Frequency Response (6dB range) . 12

27、5Hz8kHz5) Signal-to-noise Ratio (Playback/Record). 43dB/43dB6) Distortion (Playback/Record). 3% / 4%7) Crosstalk (Playback: 1kHz). 55dB8) Channel Separation (Playback: 1kHz). 50dB9) Erase Ratio. 55dB4. COMPACT DISC PLAYER SECTION1) Frequency Response (200Hz-18kHz) . +0.5/-3.0dB2) Signal-to-noise Rat

28、io (1kHz). 70dB3) Dynamic Range (1kHz). 70dB4) T.H.D. (1kHz). 0.2%5) Separation (100Hz/1kHz/10kHz). 45dB/45dB/40dB6) Access Time Short / Long. 2sec/5sec5. GENERAL1) Power requirement. Refer to the back panel of unit2) Power consumption . 170W3) Dimension (W x H x D). 273 x 326 x 360 (mm)4) Weight (n

29、et). 9.1kgNOTE : Specification are subject to change without notice in the course of product improvement.- 2-1 -TAPE DECK ADJUSTMENT1. AZIMUTH ADJUSTMENTFigure 1. Azimuth Adjustment Connection DiagramCH1 CH2Speaker OutPlayback ModeHeadTest TapeMTT-114L chR chGNDDual-tracesynchroscopeElectronicVoltme

30、terL outR outUnitSECTION 2. ELECTRICALADJUSTMENTSThis set has been aligned at the factory and normally will not require further adjustment. As a result, it is notrecommended that any attempt is made to modificate any circuit. If any parts are replaced or if anyone tamperswith the adjustment, realign

31、ment may be necessary.IMPORTANT1. Check Power-source voltage.2. Set the function switch to band being aligned.3. Turn volume control to minimum unless otherwise noted.4. Connect low side of signal source and output indicator to chassis ground unless otherwise specified.5. Keep the signal input as lo

32、w as possible to avoid AGC and AC action.Deck ModeTest TapeTest PointAdjustmentAdjust forA Deck PlaybackMTT-114Speaker OutDECK ScrewMaximumAzimuth ScrewB Deck PlaybackMTT-114Speaker OutAzimuth ScrewMaximum2. MOTOR SPEED ADJUSTMENTFigure 2. Motor Speed Adjustment Connection DiagramHeadPlayback ModeUn

33、itSpeaker OutGNDL outR outRecord/PlaybackheadTest TapeMTT-111Frequency CounterDeck ModeTest TapeTest PointAdjustmentAdjust forRemarkNormal SpeedMTT-111Speaker OutVR2013kHz 1%A DeckHI-SpeedMTT-111Speaker Outmore than 5.4kHzHI-Speed Dubbing Mode- 2-2 -3. RECORD BIAS ADJUSTMENTHeadUnitPN202GNDRecord/Pl

34、aybackheadTest TapeMTT-5511Record/Playbackand Pause ModeFrequency CounterDeck ModeTest TapeTest PointAdjustmentAdjust forRec/PauseMTT-5511ERASE HEADL20360kHz5kHz (Auto stop)WIRE(PN202)85kHz5kHz(Auto Reverse)Figure 3. Record Bias Adjustment Connection Diagram4. TUNER ADJUSTMENTFigure 4. Tuner(S curve

35、) Adjustment Connection DiagramUnitSignal GeneratorGNDElectronicOSCILLOSCOPEFM AntennaTerminalSpeakerItemTest PointAdjustmentAdjust forDC VoltageChecker PinL1060V50mVAM IFSpeaker outL101MAXIMUM2-9 2-10 BLOCK DIAGRAMAC 4.6V FOR FIP2-21 2-22 16P5P6P10P3P8P12P12PJK102JK401JK101JK702CN302PN801PN805PN803

36、PN806PN202PN201CN701PN701CN305T60110PCN603PN603PN80620PPN8044P2PPN802JK10210PCN702PN70210PT602PN6018PCN6016P20PCN806PN302VR304VR301PN30117PVR302CN304WIRING DIAGRAMNOTES :1. Wiring diagram for this model are subject to change for improvement without prior notice.2-11 2-12 SCHEMATIC DIAGRAMS AMP/POWER

37、 SCHEMATIC DIAGRAM2-13 2-14 POWER SCHEMATIC DIAGRAMNOTES :1. Resistance values are indicted in ohms unless otherwise specified (K=1,000, M=1,000,000).2. Capacitance values are shown in microfarads unless otherwise (P=MICRO-MICRO FARADS).3. Schematic diagram for this model are subject to change for i

38、mprovement without prior notice.2-15 2-16 FRONT SCHEMATIC DIAGRAMNOTES :1. Resistance values are indicted in ohms unless otherwise specified (K=1,000, M=1,000,000).2. Capacitance values are shown in microfarads unless otherwise (P=MICRO-MICRO FARADS).3. Schematic diagram for this model are subject t

39、o change for improvement without prior notice.2-17 2-18 TUNER SCHEMATIC DIAGRAMNOTES :1. Resistance values are indicted in ohms unless otherwise specified (K=1,000, M=1,000,000).2. Capacitance values are shown in microfarads unless otherwise (P=MICRO-MICRO FARADS).3. Schematic diagram for this model

40、 are subject to change for improvement without prior notice.2-20 2-19 CDP SCHEMATIC DIAGRAM3-1 3-2 SECTION 3. EXPLODED VIEWS CABINET AND MAIN FRAME SECTION286287286264355267271262260454354352351A26A41257274291292272454305302303354454454A43454800A00452288454454301353454A47278280279277452330451451A463

41、10453312311454NOTE) Refer to “SECTION 5 REPLACEMENTPARTS LIST” in order to look for the part number of each part.3-3 3-4 TAPE DECK MECHANISM: AUTO REVERSE DECKNOTE) Refer to “SECTION 5 REPLACEMENTPARTS LIST” in order to look for the part number of each part.400011503401401009010501502507508013406409

42、410036032038034035039029040031028027026014015403504024025023405A01402022016017018019020021505007008003004005001002404400400506037006LOCA. NOPART NO.SPECIFICATIONA006730R-G007BCDM-H1323 CD CHANA016768R-UP01A50-093-4249 PCB AS0016768R-BP01B02-084-4202 BELT/FELT0026768R-BP01A02-084-4204 BELT/FELT003676

43、8R-AP01D50-239-4027 CWL440046768R-AP01E50-239-4026 ARM0056768R-SP01E01-082-4654 SPRING 0066768R-QP01A50-093-4316 MOTOR0076768R-GP01A50-093-4063 GEAR 0086768R-SP01F01-082-4598 SPRING0096768R-MP01C50-219-4014 MOLD 0106768R-SP01C01-082-4652 SPRING0116768R-SP01A01-081-4601 SPRING0136768R-SP01B01-082-465

44、1 SPRING0146768R-SP01G01-082-4597 SPRING0156768R-AP01A50-268-3016 ARM 0166768R-GP01C50-093-4069 GEAR0176768R-AP01C50-239-4072 ARM 0186768R-GP01D50-222-4007 GEAR0196768R-SP01H01-081-4657 SPRING 0206768R-BP01C02-083-4188 BELT/FELT0216768R-LP01A50-223-4254 PULLEY0226768R-VP01A50-093-4125 SOLENOID023676

45、8R-GP01B50-221-3009 GEAR 0246768R-AP01B50-139-4292 ARM 0256768R-JP01B50-093-3361 PULLEY0266768R-SP01D01-080-4609 SPRING 0276768R-DP01A50-259-3342 LEVER 0286768R-RP01A22-027-41054 ROLLER0296768R-MP01A50-219-4033 MOLD 0316768R-SP01L01-080-4649 SPRING0326768R-EP01A50-093-4070 HEAD AY0336768R-JP01A50-09

46、3-3360 PULLEY0346768R-SP01K01-082-4650 SPRING0356768R-PP01A50-119-4046 PRESS0366768R-PP01B50-160-4108 PRESS0376768R-JP01C50-093-3315 PULLEY0386768R-MP01D50-219-4034 MOLD0406768R-SP01M01-080-4607 SPRING4006768R-CP01AGSE10A2003 SCREW4016768R-CP01BGSE20A2005 SCREW4026768R-CP01CGSE10A2004 SCREW4036768R-

47、CP01DGSL10A1704 SCREW4046768R-CP01EGSP10A2603 SCREW4056768R-CP01FGSP11A2012 SCREW4066768R-CP01GGSE20A2004 SCREW4096768R-CP01LGSD10A2018 SCREW4106768R-CP01M03-300-4056 SCREW 5016768R-WP01AGWM19S035035 WASHER5026768R-WP01BGWM17S050035S WASHER5036768R-WP01CGWM40X075010 WASHER5046768R-WP01DGWP21X045020

48、WASHER5056768R-WP01EGWP12X030040S WASHER5066768R-WP01HGWP23X040020 WASHER5076768R-WP01FGWN21X040040 WASHER5086768R-WP01GGWM19X055035S WASHER- 3-5 - 3-6 - TAPE DECK MECHANISM: AUTO STOP DECK(OPTIONAL)NOTE) Refer to “SECTION 5 REPLACEMENTPARTS LIST” in order to look for the part number of each part.40

49、0011503401401009010501502013406409408407032031030029028401027026014015403504024025023405A01402022016017018019020021505007008003004005001002404400400006LOCA. NOPART NO.SPECIFICATIONA006730R-G007ACWL44FF25 TOKYO PIGEON L-DOUBLA016768R-UP01A50-093-4249 PIGEON UNIT PCB AS0016768R-BP01B02-084-4202 PIGEON

50、 BELT / FELT C0026768R-BP01A02-084-4204 PIGEON BELT / FELT C0036768R-AP01D50-239-4027 PIGEON ARM CWL440046768R-AP01E50-239-4026 PIGEON ARM CWL440056768R-SP01E01-082-4599 PIGEON SPRING CWL40066768R-QP01A50-093-4316 PIGEON MOTOR(ASSY)0076768R-GP01A50-093-4063 PIGEON GEAR CWL440086768R-SP01F01-082-4598