LG-FFH818A-cs-sp 维修电路原理图.pdf

4SERVICING 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) The 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 malfunction 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 laser 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 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 cleaners, 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 don t letcontact fingers or other exposed skin.MagnetHow to hold the pick-upPressurePressureCotton swabConductive SheetRadioFans.CN 收音机爱 好者资料库5NOTES 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 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 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 should 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 grounded.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 eyes or bare skin.ArmbandConductiveSheetResistor(1 Mohm)Resistor(1 Mohm)CAUTIONRadioFans.CN 收音机爱 好者资料库6ESD 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 integratedcircuits 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, drain 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 assembly 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 solder 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 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, 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 harmless 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).ADJUSTMENTSThis 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, realignment 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 low as possible to avoid AGC and AC action.TEST & ADJUSTMENT POINTFigure 1. Main P.C. Board(FFH-717)- 8 -VR201(Adjustment Point)L203(Rec Bias)L105(LW/SW USABLESENSITIVITY)L016(DC VOLTAGE)L017(MW USABLESENSITIVITY)TAPE DECK ADJUSTMENT1. AZIMUTH ADJUSTMENTFigure 3. Azimuth Adjustment Connection DiagramCH1 CH2Speaker OutPlayback ModeHeadTest TapeMTT-114L chR chGNDDual-tracesynchroscopeElectronicVoltmeterL outR outUnitFigure 2. Main P.C. Board(FFH-818)Deck ModeTest TapeTest PointAdjustmentAdjust forA Deck PlaybackMTT-114Speaker OutDECK ScrewMaximumAzimuth ScrewB Deck PlaybackMTT-114Speaker OutAzimuth ScrewMaximumVR201(Adjustment Point)L203(Rec Bias)L105(LW/SW USABLESENSITIVITY)L016(DC VOLTAGE)L017(MW USABLE SENSITIVITY)- 9 - 10 -3. RECORD BIAS ADJUSTMENTHeadUnitPN202GNDRecord/PlaybackheadTest TapeMTT-5511Record/Playbackand Pause ModeFrequency CounterDeck ModeTest TapeTest PointAdjustmentAdjust forRec/PauseMTT-5511ERASE HEADL20385kHz5kHzWIRE(PN202)Figure 5. Record Bias Adjustment Connection Diagram4. TUNER ADJUSTMENTFigure 6. Tuner(S curve) Adjustment Connection DiagramUnitSignal GeneratorGNDElectronicOSCILLOSCOPEFM AntennaTerminalSpeakeItemTest PointAdjustmentAdjust forDC VoltageChecker PinL1060V50mVMW UsableSpeaker OutL107MaximumSensitivityLW/SW UsableSpeaker OutL105MaximumSensitivity2. MOTOR SPEED ADJUSTMENTFigure 4. Motor Speed Adjustment Connection DiagramHeadPlayback ModeUnitSpeaker 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- 41 -EXPLODED VIEW/PARTS LISTCABINETA05A16A14A10A11A02A03A25A01A33A17A36A19A31A23A37A04A12A13A32A20A22A39A18A34A27A26A09A08A06A21A15A07A38A35A013720SCM038A(*)PANELFRONTHZA023580SCA346A DOORCST LEFTHZA013720SCM038APANELFRONTHZA023580SCA346A DOORCSTHZA033580SCA347ADOORCST RIGHTHZA043580SCC878BDOORCDHZA053550SC0008CCOVERFRONTHZA064940SC0053AKNOBJOGHZA073680SC0004ALENSJOGHZA083790SCM056C( * )WINDOWCST-L(FOR FFH-717)HZ3790SCM056E(* )WINDOWCST-L(FOR FFH-818)HZA093790SCM057AWINDOWCST-RHZA103790SCM058AWINDOWAMPHZA113790SCM059AWIMDOWCDHZA124940SC0051AKNOBTUNINGHZA134940SC0052BKNOBPLAY & FUNCHZA144940SC0055AKNOBVOLHZA153680SC0005ALENSSETHZA163508SB0001ADECORATIONHI-TONEA174901SK0001CDAMPER ASSYHZA183140S-P907ACHASSISMAINHZA193720S-0036DPANELSIDEHZA203090S-0003FCABINETTOPHZA21447-938KCUSHIONCUSHION RUBBER(MTR-400/50)HZA223720SCM409A(*)PANELBACK(FOR FFH-717)HZ3720SCM043A(*)PANELBACK(FOR FFH-818)HZA236410SCE200APOWER CORDCE-503PLUG CHAUS CE 2000MHZA24632N218ECOIL, ANTENNAKS951212-01 KWANGSUNGHZA25442-577BSPRINGSPRING CST-PACK(H=7.5)A26442-085ASPRINGSPRING-DOORA27384-535AGUIDEEJECT AYA284930S-0536AHOLDERHOLDER GUIDEA29442-780ASPRINGA30384-014AGUIDEEJECTORA31265-013BFOOTRUBBER(NBR)A32246-444KDECORATIONPLATE FFHKL588V SILVERHZA33353-025TSCREWTAPTITE 3X10.5 FZMYHZA34353-025CSCREWTAPTITE 3X10 FBKHZA351TRL0402418BRAIZER HEAD TAD 4.0 L 8.0 MSWR3/FZYHZA366730S-G005BDECK MECHANISMADR2400FF SAMSUNGHZA374405SCE002AMECHANISM ASSYCDM-H1303 SHIN HEUNG CDHZA384920S-E007AHEAT SINKMAINHZA394810S-0901ABRACKETICHZS S L LO OC CA A. .N NO O. .P PA AR RT T N NO O. .( (G GS S) ) D DE ES SC CR RI IP PT TI IO ON N S SP PE EC CI IF FI IC CA AT TI IO ON NV V C CU VC Shows the origin of local ports(HZ:LGEHZ)U * : Refer to the SPPL (Service Parts Price List). - 42 -TAPE DECK MECHANISM:AUTO STOP DECK(OPTIONAL)98147344846405856844527554112251353262169167334354156614238249622838678129473448465856844527554139361225135326216816733435415661423824962283867936397261599333161599333164108109110112612081942911374908988611159088617493639851178011779BDEADCREF.NO.PART NAMEPART NO.QTY-DECK MECHANISM6730S-G005B1CHASSIS MAINNSP22BASE HEAD CNSP03BASE HEAD D NSP24PLATE SPRINGNSP25BARK MOTOR 110NSP06BARK MOTOR 128NSP07PLATE PLYWHEEL FNSP28CHIP REELNSP49BASE REELNSP410BRACKET HEADNSP011GEAR HEAD CNSP012GEAR CAMNSP213GEAR IDLERNSP214BUSH CNSP215PULLEY CNSP216PULLEY F/W FNSP217PULLER F/W RNSP018BRKT HEAD BNSP019GEAR HEAD BNSP020PULLEY M/T YDWNSP121LEVER BRAKENSP222GEAR DIRNSP023ARM PINCH F6768SCAS03A224ARM PINCH RNSP025ARM CAM LOCK NSP226ARM RFNSP227GEAR RFNSP428CAP CNSP229LEVER EJECT6768SCDS03A230GUIDE MOTORNSP031TAPE GUIDENSP232LEVER ACNSP033W/S(2.3N3.5N0.25)NSP234W.S(1.8N4N0.5)NSP235W/S(1.6N3.5N0.5)NSP036W/S(3.6N6N0.5)NSP437W/S(6N11N0.25)NSP038W/S(1.2N3.2N0.25)NSP239W/S(4.6N71N0.13)NSP440SHAFT PINCHNSP241SHAFT IDLERNSP242PIN AZIMUTHNSP043SHAFT RFNSP244SHAFT F/W RNSP045SHAFT F/W FNSP246S/P B.T(F)NSP247S/P B.T(R)NSP248S/P LEVER ACNSP049S/P BASE HEADNSP250S/P DIRNSP051S/P PINCH(F)6768SCSS02A052S/P PINCH(R)NSP053S/P ARM CAM LOCKNSP254S/P CNSP255S/P ARM RFNSP256S/P P/R(F)NSP257S/P P/R(R)NSP058S/P PINCH 1-WAYNSP259S/P AZIMUTHNSP260(HEAD)PH M1 6N8NSP061(NORMAL)BH M2N4 NSP6REF.NO.PART NAMEPART NO.QTY62(MOTOR)PH M2 6N5 NSP063(BAKT)Tapping M26N4 NSP064S/C AZIMUTH(M2N8)NSP265(AZIMUTH)M2N5.7NSP066FELT CNSP267BELT SUB(34.7)NSP268BELT 110 “ 54.3 6768SCBS03B169BELT 110 “ 76.26768SCBS03C170BELT 128 “ 54.3NSP071BELT 128 “ 80.8NSP072BELT SR “ 66.3NSP073BELT TR “ 66.3NSP074PCB CTRL SINGLENSP275PCB CTRL DOUBLENSP076CONN R/P(16P)NSP077CONN R/P(13P)NSP078CONN PB(10P)NSP079CONN HEAD(6P)NSP180CONN HEAD(3P)NSP181WIRE MOTOR(4P-80)NSP182ROLLER PINCH6768SCRS01A283WEDGENSP284SOLENOID(24)6768SCVS02A285REFLECTORNSP286METAL FG F(CAPS)NSP287METAL FG R(CAPS)NSP088PHOTO SENSORNSP289SETECT(MXS00220)NSP590SWITCH MODE6768SCTS01B291HEAD R/PNSP092HEAD P/BNSP093HEAD 1-WAY6768SCHS01A294MOTOR(YD2BH)6768SCQS01A195WIRE HEAD(BRN)NSP096WIRE HEAD(BLU)NSP097WIRE HEAD(GRN0NSP098WIRE HEAD(ORA)NSP099WIRE HEAD(RED)NSP0100WIRE HEAD(WHT)NSP0101WIRE HEAD(YEL)NSP0102103104DIODENSP2105RESISTORNSP2106SHAFT SUBNSP0107M/T GUIDENSP0108HEAD ERASE6768SCHS03A1109(M/T)MACH M2.6 4NSP3110CUSHION MOTORNSP3111BRKT MOTOR D2NSP0112BRKT MOTOR D1NSP1113CONN R/P(12P)NSP1114CONN R/P(11P)NSP0115CONN PB(8P)NSP1116PH M2 9(E-HEAD)NSP1117PCB HEADNSP2HEAD ASSY RP56768SCES03AHEAD ASSY RP66768SCES03BPulley F/W F ASSY6268SCJS02AARM Pinch F ASSY6768SCAS01BMOTOR ASSY6768SCOS01ANSP: Not Serviceable Part- 43 -TAPE DECK MECHANISM:AUTO REVERSE DECK(OPTIONAL)7143473721523147424651734124503874308401492210482318641363039491261112037443257253562872712643314742535171734024503889221048231863136303949126111203744253562872666577777675755954792287126178068291960155616358585278889?ADCFEGDBREF.NO.PART NAMEPART NO.QTY-DECK MECHANISM6730S-G005A1CHASSIS MAINNSP22BASE HEAD CNSP13BASE HEAD DNSP14PLATE SPRINGNSP25BRKT MOTOR 110NSP16PLATE FLYWHEEL FNSP27CHIP REELNSP48BASE REELNSP49GEAR CAMNSP210GEAR IDLERNSP211BUSH CNSP212PULLEY CNSP213PULLEY F/W FNSP214PULLEY F/W RNSP115BRKT HEAD BNSP116GEAR HEAD BNSP117PULLEY M/T TDWNSP118LEVER BRAKENSP219GEAR DIRNSP120ARM PINCH F6768SCAS03A221ARM PINCH R6768SCAS04A122ARM CAMLOCKNSP223ARM RFNSP224GEAR RFNSP425CAP CNSP126LEVER EJECT6768SCDS03A227GUIDE MOTORNSP128TAPE GUIDENSP129LEVER ACNSP130W/S(2.3*3.5*0.25)NSP331W/S(1.8*4*0.5)NSP232W/S(1.6*3.5*0.5)NSP133W/S(3.6*6*0.5)NSP434W/S(6*11*0.25)NSP435W/S(1.2*3.2*0.25)NSP236W/S(4.6*7.1*0.13)NSP437SHAFT PINCHNSP338SHAFT IDLERNSP239SHAFT RFNSP240SHAFT F/W RNSP141SHAFT F/W FNSP242SPRING B/T(F)NSP243SPRING B/T(R)NSP244SPRING BASE HEADNSP244-1SPRING LEVER ACNSP145SPRING DIRNSP146SPRING PINCH(F)6768SCSS02A147SPRING PINCH(R)6768SCSS03A148S/P ARM CAM LOCKNSP2REF.NO.PART NAMEPART NO.QTY49SPRING CNSP250SPRING ARM RFNSP251SPRING P/RETURE(F)NSP252SPRING P/RETURN(R)NSP153SPRING PINCH 1-WAYNSP154SPRING AZIMUTHNSP155PH M1.6*8NSP256BH M2*4NSP457PH M2.6*5NSP258TAPPING M2.6*4NSP459AZIMUTH S/C 1-WAYNSP160AZIMUTH S/C M2*5.7NSP261FELT CNSP262BELT SUB(PI33.1)NSP263BELT 110NSP164BELT 110 NSP165PCB CONTROL DOUBLNSP166CONNECTOR(16P)NSP167CONNECTOR(6P)NSP168WIRE MOTOR(4P-80)NSP169ROLLER PINCH6768SCRS01A370WEDGE( ” )NSP171SOLENOID(24 OHM)6768SCVS02A272REFLECTORNSP273METAL FG F(CAPSTAN)NSP274METAL FG R(CAPSTAN)NSP175PHOTO SENSORNSP276SWITCH DETECTNSP677SWITCH MODE6768SCTS01B278HEAD R/PNSP179HEAD 1-WAYNSP180MOTOR(YD2BH)6768SCQS01A181WIRE HEAD(BRN)NSP182WIRE HEAD(BLU)NSP183WIRE HEAD(GRN)NSP184WIRE HEAD(ORA)NSP185WIRE HEAD(RED)NSP186WIRE HEAD(WHT)NSP187WIRE HEAD(YEL)NSP188Head PCBNSP189CONN Head(3P)NSP1HEAD ASSY RP66768SCES03BBRK HEAD ASSY RP16768SCES04AARM Pinch R ASSY6768SCAS01AARM Pinch F ASSY6768SCAS01BPulley F/W F ASSY6268SCJS02AMOTOR BRKT ASSY6768SCPS01AMOTOR ASSY6768SCOS03ANSP: Not Serviceable Part- 44 -EXPLODED VIEW/PARTS LISTCD MECHANISM436383534252420202120181919282322223733323130272942610987635211213141516172211REF.NO.PART NO.DESCRIPTION-4405SCE002ACD MECHANISM ASSY(CDM-H1303)14680SBP001AMOTOR PULLEY ASSY24400SB0001ABELT MAIN34470SB0005AGEAR MAIN488H-0004SCREW(3X12X12)54470SB0007AGEAR PU UP-A64470SB0008AGEAR PU UP-B74470SB0006AGEAR PU DOWN84470SB0004AGEAR LOADING94470SB0003AGEAR PULLEY106871SB21RADPCB ASSY CLOSE11353S353FSCREW D2.6 L4.0124974SB0001AGUIDE CAM134