Technics-RSEH760-tape-sm 维修电路原理图.pdf

RadioFans.CN 收音机爱 好者资料库RadioFans.CN 收音机爱 好者资料库N Deck 1 cassette holder open button ( OPEN)O Deck 1 cassette holderP Fast forward/rewind buttons (6, 5) Q Deck 2 cassette holderR Deck 2 cassette holder open button ( OPEN) S Counter reset, display buttons(COUNTER, RESET, DISPLAY) T Deck 1/deck 2 select button (DECK 1/2)U Playback buttons and indicators (, !) The color of the indicators depends on the operation taking place.If stopped, fast forwarding or rewinding: orangeIf playing or recording: greenWhile carrying out TPS or recording is on standby: flashesV Stop button (?) W Dolby noise reduction button (DOLBY NR) X Reverse mode button (REV MODE) Y Tape edit button (TAPE EDIT) Z Record pause button (? REC PAUSE)COUNTERRESETDISPLAYDECK 1/20OPEN0OPENDOLBY NR7?1REV MODE TAPE EDITHRECPAUSETWXZYUVSPOQRNCXA1552M-T4IC201DOLBY B NRRECEQ87654321R101,C115(R102,C116)Q103(Q104)1142(43)41(44)40(45)39(46)29(8)RECEQ AMP353634448121516171824252627LATCHSHIFTREGISTERREC EQCONT.P.B. EQCONT.AGC38(47)31(6)30(7)2221201932(5)1215R/P5124+B12+B1+B1VR102(VR103)PLAYBACK GAIN ADJ.(DECK2)DECK2R/P HEAD+B1Q101(Q102)ATT2ATT1ATT3SCDETON/OFFCXA1998BQT6IC101R/P EQ AMPBA7755AFIC103R/P SELECTQ107Q303,304BIASOSCD301DECK2ERASE HEAD+B1L301Q301,305,306BIAS OSCcontrol(CrO2/METAL)Q302TP301TP302Q105(Q106)AMS23+B3RFSMUTE3DECK1PLAYBACK HEAD+B1714MC14066BFELIC102DECK 1/2 SELECTVR104(VR101)PLAYBACK GAIN ADJ.(DECK1)1(11)4(8)13(12)2(10)5(6)3(9)3(14)1(16)6(11)7(10)8(9)Q202ENC/DECselectQ201DolbyON/OFFS953(CrO2,DECK1)S973(CrO2,DECK2)S976(METAL,DECK2)S951(MODE)S952(HALF)SoleniddriveD951SOLENOIDQ807,809CAPSTANMOTOR(DECK1)VR801(TAPE SPEED ADJ.)MCapstanmotordriveQ803,805+B2D101D102DOLBYL(R)ch+B3+B30N2180RLC1IC951/952PHOTOINTERRUPTERNotesSignal line: Playback signal line: Recording signal line() indicates pin No. Right channel.TPS25S975(F. REC. INH.)S971(MODE)AD SW345Z971LADDERRESISTOR+B321739M38503M2400FIC701MICRO COMPUTER18RESET26A DATA27A CLKA LATCH28ResetsignalgeneratorQ706,D705+B3SYNC18CN601234567912CS+B(10V)D.GNDSCLKDATA1110DECK REQNCTAPE Rch OUTRS A.GND131415161718R CHCLK108REQInterfaceQ7017HALTCS9+B3TAPE Lch OUTTAPE Rch INTAPE Lch INR CHDATA INDATA OUT1211Q702,703InterfaceTP604Q604,D606RegulatorD7102019X OUTX INX701(8MHz)AVssVss15,2133132DOLBYON/OFFENC/DECCRO2 122METAL 214MODE23HALF1246M1S972(HALF)S974(R. REC. INH.)6SoleniddriveD971SOLENOIDQ808,810CAPSTANMOTOR(DECK2)VR803(TAPE SPEED ADJ.)MCapstanmotordriveQ804,806+B2M230PL229MC240MC141KEY241KEY SWITCH(S900,901,903907,909915)KEY142To CD CHANGER,CD PLAYERBLOCK DIAGRAMTo SOUND PROCESSORBLOCK DIAGRAMNCNCA.GNDNCNC+B2TP609VREF+B3Vcc21D7075PL1CRO2 213LEDdriveLEDdrive+B3Q903,904D905,907()Q901,90216FWD LED17REV LED37LED CNTPHOTO2 T3840PHOTO1 T1920NCNC+B1RegulatorQ602,D651,652Rch INLch INRch OUTLch OUT0N2180RLC1IC971/972PHOTOINTERRUPTER(D.GND)A.GND+10V+B1714MC14066BFELIC202SIGNAL CONT.10(8)12(6)11(9)Q1084LMTAMAIN P.C.B.DEARTH TERMINAL P.C.B.EOPERATION P.C.B.W601W601CP102CP101DECK 2R/P HEAD,ERASE HEADDECK 1PLAYBACKHEADCP305CAPSTANMOTORDECK 2CP306CAPSTANMOTORDECK 1To CD CHANGER, CD PLAYER & SOUND PROCESSORCP902CP901CMECHANISM P.C.B. (DECK 2)BMECHANISM P.C.B. (DECK 1)FW901CN901BLACK1 . . . 52 41 . 51 . . . 52 41 . 51.41.41 . . . . . . . 91 . . . . . . . 91 . . . . . . 81 . . . . . . 8CS9511 . . . . . . . 9CS9711 . . . . . . . 9364MAIN CIRCUITABACBACP10112345CP10212345IC103BA7755AFR/P SELECT1246783547K47K47K47KQ3012SD1819ARTXBIAS OSC CONT.Q306DTC144EUT106BIAS OSC CONT.Q305DTC144EUT106BIAS OSC CONT.Q3022SD1328STXRASWITCHING(REC:ON)Q303,3042SD1450RSTABIAS OSCQ303Q304Q1022SJ164RTAHEAD SELECT(REC:ON)Q106Q103,1042SJ164QTAHEAD SELECT(PLAY:ON)Q104Q103Q105,1062SD1819ARTXMUTINGQ105Q1012SJ164RTAHEAD SELECT(REC:ON)SGDSGDDGSDGSL301IC101CXA1998BQT6R/P EQ AMP125LchRchPLAYBACKHEADDECK1LchERASEHEADDECK2RchR/P HEADR106330KC102680PC101680PR105330KC143470PC115470PR1015.6KR103100KC15010V100C12325V4.7R11922R11822C13016V100C11950V1C14016V10C131470PC12910V22R1171KC117330PR11182R11312KC1116.3V47R1091KC1090.018R141100R142100R144100C144470PC104680PC1100.018C1126.3V47R11282R11427KR1101KC11450V2.2C11350V2.2R1025.6KR104100KC116470PC1253300PC1263300PC118330PR1542.7KC12050V1R13333KR1304.7MC1396.3V47C12425V4.7R13227KC30116V470C3036800PC302100V2.2NR3131TP302TP301R3021.8KR30110KD301MA111TXC30550V0.1C30416V100R3032.2KR30415KR30518KR30633KR1384.7KR1372.2KC3096.3V47R3081KC3110.01C3100.01C3083300PR3071/2W2.2C3231000PC3071000PR3094.7KR3104.7KR3114.7KL302100 HR1343.9KR1356.8KD102MA111TXD101MA111TXR15822KR1274.7KR125100KC1380.047C13750V0.1C13550V1C13650V1R120100KC132470PR1532.7KR15722KC103680PR143100R10710KR131330KR10810KLATCHESSHIFTREGISTERSPBEQCTLAGCAMSRECEQ20K20K10KMUTE40KAGCGAIN210K210K210K 210KIREF40KAGCGAIN10KRECEQRFS12345678910111213232437383940414243444546474820K20K252627282930313233343536REQEQCTL222120191817161514C3060.039R1362.2K9.6V:POSITIVE VOLTAGE LINE: PLAYBACK SIGNAL LINE: RECORDING SIGNAL LINE9.6V0V0V(0.2V)9V0V0V0V0V(8.9V)0V(0.7V)0V0V0V0V(0.7V)0V(8.9V)(0.2V)9V0V0V6V9.6V0V0V(9.5V)0V(0.7V)0V0V(0.6V)0V0V(0.6V)0V(0.7V)0V(0.8V)0V(0.6V)0V9.5V9.5V(0.6V)0V0V(0.1V)(0.1V)0VERASE CURRENTCHECK POINT5V0V4.5V4.5V4.5V4.5V4.5V8.6V5V0V(1.6V)0V(0.2V)5V5V(9.6V)0.1V(0.1V)9.6V(0.2V)9.6V(0.2V)5V(5V)0.2V4.5V9V9V4.5V4.5V4.5V4.5V0V5V0V1.2V2.6V2.6V1.3V0V0V0V0V1.3V2.6V2.6V1.2VDOLBYRchFDECNRMOBAIC201CXA1552M-T4DOLBY B NR123458912131415ATT2ATT2ATT3ATT3ATT1ATT1SCDETSCDET67101116ON/OFFR/PB AJIABABIC102MC14066BFELDECK 1/2 SELECT12345678910111213144.7K4.7KQ107DTA143EUT106R/P SELECT4.7K4.7K4.7K4.7KQ202DTA143EUT106ENC/DEC SELECTQ201DTA143EUT106DOLBY ON/OFFR2091KR7252.2KR7302.2KR7262.2KC134470PC133470PC1420.1C20325V4.7R21110KC207270PL201R2182.2KR2172.2KC2111500PC22010V470C21916V100C2410.01R23722R22022C239680PC20550V1R221100R2301KR22310KC22325V4.7C22150V0.68R2133KR21512KC21325V4.7C22525V4.7C21750V0.1R222100R21918KC20650V1C240680PC2121500PR21210KR2101KC20425V4.7C208270PL202C21425V4.7R21612KC22625V4.7R22410KR2311KR151100KR14047KR152100KR13947KC14150V1R1485.6KVR10220K(B)R1505.6KVR10420K(B)R2143KC22250V0.68R1495.6KVR10320K(B)R1475.6KVR10120K(B)C21850V0.1DOLBYLchCR12210KR12110K:POSITIVE VOLTAGE LINE: PLAYBACK SIGNAL LINE: RECORDING SIGNAL LINE5V5V9.6V9.6V(0.2V)9.6V0V(9.5V)4.8V9.6V4.7V4.7V4.6V4.7V0.4V4.8V4.8V4.7V1.2V4.7V0.4V4.8V4.6V(0V)0V5V5V5V(0V)5V(5V)0VPLAYBACKGAIN ADJ.(DECK1/Lch)PLAYBACKGAIN ADJ.(DECK2/Lch)PLAYBACKGAIN ADJ.(DECK1/Rch)PLAYBACKGAIN ADJ.(DECK2/Rch)9.6V9.6V(0.1V)0V0V0V0V9.6V(0.1V)0V0V0V0V(9.6V)0.1V(9.6V)0.1VDOLBYON : 0VMAIN CIRCUITAMECHANISM CIRCUIT (DECK1)BMECHANISM CIRCUIT (DECK2)CCP901CS951CP902CS971Q806DTA143EUT106MOTOR DRIVE CONT.Q8042SD592ARSTAMOTOR DRIVE4.7K4.7KCP3051234Z971BA12345674.7K50K25K4.7K4.7K4.7K50K50K50K50K25K25KABDCIC971,9720N2180RLC1PHOTOINTERRUPTERCA BQ8032SD592ARSTAMOTOR DRIVEQ805DTA143EUT106MOTOR DRIVE CONT.4.7K4.7KCP30612341234567891234567894.7K4.7K4.7K4.7KQ8072SB621ARSTASOLENOID DRIVEQ809DTC143EUT106SOLENOID DRIVEQ810DTC143EUT106SOLENOID DRIVEQ8082SB621ARSTASOLENOID DRIVED LEKCAPSTANMOTOR(DECK1)ABMCAPSTANMOTOR(DECK2)ABM123456789123456789R80610KR802560R823560R824560R812560R81110KR814470R8182.2R8053.9KR80310KR81010KR8083.9KVR8035K(B)VR8015K(B)R8202.2R813470EBACBAR951680D951MA165TASOLENOIDS951(MODE)S953(CrO2)S952(HALF)R97439KS973(CrO2)S976(METAL)S972(HALF)S971(MODE)S974(R.REC.INH.)S975(F.REC.INH.)R971680D971MA165TASOLENOIDEIC971IC972R97339KDIC951,9520N2180RLC1PHOTOINTERRUPTERR95439KIC951IC952R95339K1234123412341234AGHBQSPF:POSITIVE VOLTAGE LINE5V10.3V5V10.3V5V10.3V5V5V10.3V0V10.3V0V0V10.2V0V10.2V0V10.3V0V10.3V0V0V9.8V5V0V5VTAPE SPEEDADJ.(DECK1)0V5V5V0V0V0.8VTAPE SPEEDADJ.(DECK2)TP609CN601CN901IC701M38503M2400FMICRO COMPUTERECABDJIHGFPQRJEDGACEEDACBIHFQ701Q703Q7022SD1819ARTXINTERFACE132X701(8MHz)C B A FIOJKL M NG HQ6042SC3940AQSTAREGULATORR6031/4W10TP604+10V(D.GND)R6021/6W0.33R6301/6W0.33Q6022SD2144STAREGULATOR1234567891011121314151620171819SYNCCS+B (10V)D.GNDSCLKDATADECK REQNCTAPE Lch INA.GNDTAPE Rch INTAPE Lch OUTTAPE Rch OUTRS A.GNDEARTHTERMINALCIRCUITDW601E112345678Q701,7032SD1819ARTXINTERFACEQ706DTC114EUT106RESET SIGNALGENERATORC7070.01D706MA111TXD710MA111TXBDR745100R7101KR7241KR7231KD707MA4051MTAL702R7381KR7471KR7044.7KR7441KR7274.7KR7084.7KR7294.7KR74122KD708MA111TXR74347KR70547KD709MA111TXR72810KR722100R7035.6KR732100KR7214.7KR7354.7KR63247KR609100D651MA165TAD652MA165TAR604330C60216V220C60516V220C60316V47D606MA4056MTAC6040.01R6061.5KR71268KR71868KR70110KR70210KC7050.01C7010.01R711100KC7026.3V100C70650V3.3D705MA111TXR73710KR73610KD701MA111TX10K10KNCNCNCNCNCNCToMAIN CIRCUIT ofCD CHANGER,CD PLAYER &MAIN CIRCUIT ofSOUND PROCESSORCT.GNDRchOUTLchOUTRchINLchINA.GND123456789 10 11 12 13 14 15 16 17 18 19 20 21313233343536373839404142222324252627282930KEY1VCCVREFAVSSLMTPL1M1HALTREQCSCLKVSSVSSXOUTXINRESETREV LEDFWD LEDCRO2 2METAL 2DATA INDATA OUTCRO2 1MODEHALF1TPSA LATCHPL2M2ENC/DECDOLBY ON/OFFE CSNCKEY2NCNCA CLKA DATALED CNTAD SWPHOTO1 TPHOTO2 TFE D A B CR23210KFGSL70110 H:POSITIVE VOLTAGE LINE: PLAYBACK SIGNAL LINE: RECORDING SIGNAL LINE5V1.9V0.1V0V1.8V0V0V0.6V0.2V0V5V0V0V9.4V5V5.7V10.3V9.6V10.3V10.3V5V9.6V5V0V5V2.9V5V5V5V5V5V2.7V0V0V0V0V0V(5V) 0V0V5VSTOP : 0V5V5V0V5V1.4V2.2V2.5V0V0V0V0V0V0.5V1.6V1V5V5V2V2.3V1.2VP PF=8MHz2.4VP PF=8MHz4.8V0VT 16ms.3.6V0VT 16ms.3V0VT 16ms.0V4.8VT16ms.5ms. 2V/DIV.0V4.8V0V(5V)FW901OPERATION CIRCUITE123456784.7K4.7K4.7K4.7KD907SML79455C()Q901DTA143EUT106LED DRIVED905SML79455C()Q902DTC143EUT106LED DRIVES907()S906()S905(DOLBY NR)S904(REC PAUSE)S903(TAPE EDIT)S901(OPEN)S900()S915(OPEN)S909()S910()S912(DECK 1/2)S911(REV MODE)S914(COUNTERRESET)S913(COUNTERDISPLAY)R9112.2KR9101.8KR9091.5KR9081.2KR9251KR924820R9052.2KR9041.8KR9031.5KR9021.2KR9011KR9063.3KR900820R915680R914330R916330Q904DTC143EUT106LED DRIVEQ903DTC143EUT106LED DRIVE4.7K4.7KR917680D904MA111TX4.7K4.7KIC202MC14066BFELSIGNAL CONT.4.7K4.7K8910111213765432114MAIN CIRCUITAABCDEFGQ108DTC143EUT106SWITCHINGR12622KR234100C21616V10C21516V10R233100R22647KR2086.8KR22547KR2076.8K:POSITIVE VOLTAGE LINE5V5V0V5V0V0VSTOP :0V5V4.2V0V0V0V2.6V0V4.7V8.3V(0V)9.6V4.7V4.7V4.7V8.3V(0V)8.3V (0V)(5V) 0V9.6V:PLAYBACK SIGNAL LINEABCDEF12345678NC302654123L301JC303C306C304C140C305C309C114C135C136C141C205C139C112C137C113C129C111C150C213C221C301C214C222C204C206C130C124C123JJJJJJJE C BQ304E C BQ303L302R307JJJJJJJJJJJJJJJJJJR118R119JJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJJC110C109S GDQ101S GD Q104S GDQ103E C BQ804E C BQ808S GDQ102JJJJJJJJJJJJR313R143R820VR102VR103VR104VR101123456789CP90212345CP102C706JJJVR803VR801JJJJJJJJJJJJJJJJJJJJ123X701123456789CP90112345678CN901JJJD707BCEQ807R818L701C702C223C217C226C218C225C220C119C120C605C603C203C219L202L201JR220R23712345CP101C602Q803ECBQ604ECBQ602ECBR630R602R609R632D606R603D651D6521234567891011121314151617181920CN6011581016IC201IC7019151510 15 202122253035404215 781014IC102IC101IC1031510121315202425303536374045481458R309R308R310R303R110R306R305R304R120R148R149R140R139R125R127R122R121R113R117R111R105R106R144R215R213R152R813R216R214R141R142R114R133R811R812R824R136R137R721R735R703R701R722R737R736R723R724R710R747R712R745R738R728R741R727R708R744R802R806R823R814R223R153R217R154R157R604R234R606R233R158R222R224R219R212R218R211R230R221R705R704R729R743R711R702R810R808R803R805R718R134R138R732R130R151R730R147R135R112R102R132R302R107R108R131R101R150R726R725R311R109R301R103R104D301C307C323C308C132C134C126C138C142C117C102C104C118C103C101C131C143C115C116C144C125C133C311C310CEBQ107CEBQ810CEBQ105CEBQ106CEBQ301CEBQ306CEBQ305CEBQ302RJ507D102D705D706D709D708D701D1011 2 3 4CP3051 2 3 4CP306CEBQ806CEBQ202CEBQ201CEBQ706RJ508RJ509C705C707CEBQ702CEBQ703CEBQ701CEBQ805CEBQ809L702D710RJ504R231R210R209C240C239C211C604C212C208C207C241MAIN P.C.B.A(REP2827D-M)W601JTP302TP301C701TP60410VA.GNDDOLBYL chDOLBYR chR chOUTL chINR chINL chOUT(D.GND)TP609CT.GNDTo CD CHANGER, CD PLAYER & SOUND PROCESSORC215IC20215 781014C216R126R225R207R208R226CEBQ108R232Ref.No.Lo.No.Ref.No.Lo.No.Ref.No.Lo.No.Ref.No.Lo.No.ELECTRICAL PARTS LOCATIONMAIN P.C.B.AIC101IC102IC103IC201IC202IC701Q101Q102Q103Q104Q105Q106Q107Q108Q201Q202Q301Q302Q303Q304Q305Q306Q602Q604Q701Q702Q703Q706Q803Q804Q805Q806Q807Q808Q809Q810D101D102D301D606D651D652D701D705D706D707D708D709D710VR101VR102VR103VR104VR801VR803L201L202L301L302L701L702X701CN601CN901CP101CP102CP305CP306CP901CP902W601TP301TP302TP604TP609R101R102R103R104R105R106R107R108R109R110R111R112R113R114R117R118R119R120R121R122R125R126R127R130R131R132R133R134R135R136R137R138R139R140R141R142R143R144R147R148R149R150R151R152R153R154R157R158R207R208R209R210R211R212R213R214R215R216R217R218R219R220R221R222R223R224R225R226R230R231R232R233R234R237R301R302R303R304R305R306R307R308R309R310R311R313R602R603R604R606R609R630R632R701R702R703R704R705R708R710R711R712R718R721R722R723R724R725R726R727R728R729R730R732R735R736R737R738R741R743R744R745R747R802R803R805R806R808R810R811R812R813R814R818R820R823R824RJ504RJ507RJ508RJ509C101C102C103C104C109C110C111C112C113C114C115C116C117C118C119C120C123C124C125C126C129C130C131C132C133C134C135C136C137C138C139C140C141C142C143C144C150C203C204C205C206C207C208C211C212C213C214C215C216C217C218C219C220C221C222C223C225C226C239C240C241C301C302C303C304C305C306C307C308C309C310C311C323C602C603C604C605C701C702C705C706C7072C3C3B6B6B5C2B2B3B3B3B3B2C5B5B5B1C2A1C2B1D1C7B7B6C6C6C5C7C4B6C4B6C3C6C4C4D4D1B7B7B7B5C5D5C6C6C6C7C3D2D2D3D6D5D5B5B1B1B6B6C5C8B6D6B3B3C6C7D4D8B3A2A8D8B2B2B2B2B2B2B3B3B2C2C2B3B2B3C2B2C2D2D2C2C2C7B2C3C3B2B3C3D3D4D4D3C2C2C3B3B3B3B3D2C2C3D3C4B6B7B7B7A6B6B5B5B6B6B4B3B3B3B6B6B6B6B6B6B6B6B6B6B6B5B6B7B7B6B1B3B1C1D1C1C1B1C2B1C1C3A7B7B7B7B7B7B8B5C5C5C6C6C6C7C5C7C4D5C5C6C6C2D2D6C6C6C3D3D5C6C6C6C6C6C6C7C7C6C5D6D6C5D5D4C4C4B6C6C3C6C4C6B3B5D5D3B3B3B3B3B3B2B3B2C2C2B2B3C4B6B7B2B2B2D2C2B2B2B2D2D2D2C2C2C2C3C2B3C2C2B2B3B5B3B3C4B5B5B6B6B3B4B6B7B5B6B6B6B4B4B5B6B6B6B6B6B5B1B2B1B1C1B1B1C1C1C1C1C7B7B7B7B5C5C5C5C6CABCDEF12345678E1W601EARTH TERMINAL P.C.B.D(REP2827D-M)12345678FW901JJJJJJR901R902R903R904R906R900R909R915R914R916R908R924R925R917R911R905R910CEBQ903CEBQ904D904CEBQ901CEBQ902OPERATION P.C.B.E(REP2827D-M)S913(COUNTERDISPLAY)S912(DECK1/2)S914(COUNTERRESET)S909( )S905(DOLBY NR)S911(REV MODE)S903(TAPE EDIT)S904( REC PAUSE)S901( OPEN)S907( )D907( )S906( )S910( )S900( )D905( )S915( OPEN)OPERATION P.C.B.EELECTRICAL PARTS LOCATIONRef. No.Lo. No.Ref. No.Lo. No.EARTH TERMINAL P.C.B.DQ901Q902Q903Q904D904D905D907S900S901S903S904S905S906S907S909S910S911S912S913S914S915FW901R900R901R902R903R904R905R906R908R909R910R911R914R915R916R917R924R925W601E17B7B5B6B6B6B4B5B2B3B2B3B4B4B6B5B3B6B7B7B8B7A5B2B2B2B3B4B4B7B5B4B5B6B5B6B5B7B7B2E2DABCDEF12345678JR951R954JD951R9531234IC9511CS9512 3 4 5 6 7 8 9S953S952S951SOLENOID1423IC952JJ7654321Z9714 13 2IC971D971S974 S973SOLENOIDS972 S976S9711 2 3 4 5 6 7 8 9CS971R971R974JS9751423IC972R973MECHANSIM P.C.B. (DECK1)BMECHANSIM P.C.B. (DECK2)C1423142343210N2180RLCIC972IC9710N2180RLC 1142311423142342312431423142343210N2180RLCIC952IC9510N2180RLC 114231142314234231243(REP2132B)(REP2132D)Note for IC951and IC952 replacement Two different types (old or new) parts are mounted on P.C.B. as for IC951 and 952. When servicing, care to replace the parts due to those shape. Replacement proceduresOldNewMount the parts on given position.(Printed pattern on P.C.B.)For IC951: Mount the parts so th