Kenwood R-V251 Service Manual

Contents

U V X Z AB ADW Y AA ACZD19ELECTRIC/VOLUME(BOTTOMPOWER AMP (FRONT)SW INCN701IC110(1/2)IC112 (2/2)IC112 (1/2)IC110(2/2)IC111(2/2)RcHRcHScHCcH(1/2)IC111LcHC INL S INTONEMUTING-10dBATTFLFRLSCENTERSWRSZD20Q113Q114Q119Q120Q121Q123Q115Q117Q118Q116Q124Q122ZD21Q111Q110IC113(1/2)IC113(2/2)VIEW))()()(10R168OUTPUT PORT 43218567AVDDGND9R76R82 100R81 100R80 10042MCUI/F38394041R77 2.7KC49 1u50750C50220P35AGND36373334220R75C47 10u501W394041TONE TONEC171 0.33u100C169 0.015+C159C160C167 8200P111213GNDR1415GNDLLBSS3LBSS2LBSS117100P100P1618192021LTRE2832AVSS293031RTRE2627RBASS1RBASS2RBASS322232425C168 8200PC170 0.015+V(PRE)171819201IN1NFMUTE22212IN2NF+V(PRE) 1718191IN1NF202122MUTE2NF2IN233NF2425263IN3OUT+ ++++3.3u16C174+C1733.3u16++C172 0.33u1004.7u50C157R791K1KR78 R8547K47KR8634220KC1664.7u50R166220KC1644.7u50220KR165C1634.7u504.7u50C165 R167220K+4.7u50C162+220KR164C1614.7u50+220KR163C149100P100PC150C148100P4.7u50C158202425525150494847464544434241403938373635343332313029282726131415161718192021222324VDD1XS24RVDTXLATT.PREDYSCKVSS3AVS4AVD1R OUTAVD2AVS2LO2RINAVD6AVS6XSOUTAUSXXTLIXTLOAUDXXCOUTAUS5AUD5LINLO1TST2TST3TST4XRSTBFOTCSL1CSL2VSS2AVS3AVD3L OUTAVD17654321S.DATAS.BUSY10dB ATTPWR RELAYCSW RELAYSUR RELAYFR RELAY 7651KR169R170 1KCOMPUTERMICRO.I/FTrim VOLDAC4DAC3 Trim VOLAUS1 25DAC1ADC2ADC1DAC2R1224.7K 100R119R120100100R138R121100R941658722PC1300.01C13122PC132C1280.1R931R921R140 100KC126 10u50+423 1C64 100PR10915K R10733K 10u50C103+1 23+C10110u50 2.2KR101856 74C119 100PC120 47PR150 47KR149 47K100PC10722KR111330PC1051MR105100KR1037 6R104100K51.2KR1425.6KR1448.2KR1461000PC1241000PC122+10u50C1182200PC1232200PC1211000PC67100PC6810u50C125+R139 100K5.6KR1431.2KR141 8.2KR14510u50C117+100PC108R11015KR11222K330PC106R10833K1MR106 +10u50C104+10u50C102 R1022.2K+8220u6.3C134 +C1161000P 3.3KR11410KR116 10KR11812KR124330PC112R126 10KC114 330P+C11010u50100KR128R13039K464749500.1C133220u6.3C129+100KR147+C127220u6.3100KR148R117 10u50R115 1R1231000PC11510K 10K330PC11112K 43100KR127R125 10K2C113 330PC1092.2R891R90470u6.3C62 +470u6.3C61 +3.3KR113R911220u6.3C140+47KR2931000PC2930.1C141C1390.1C244+R171470 C1754.7u50100KR177100KR1781000PC1811000PC182R1891KR1901K1.2KR183R1841.2K470 4.7u50+R172 C176+R175470 C1794.7u50R1952.7K+C1871u50 1KR201R2132.2KR2142.2K1u50+C188 1KR2021000PC185R181100K1000PR179100KC183R217R1932.2K1KC1891u50+R1851.2KR2031KR1911KR2152.2KC1911u50R187 +1.2KR1992.7K 1KR205C186100KR182470P100KR180C1841000P1K1.2KR188R1942.2KR218R1921K1.2KR186R2162.2K+R173470 C1774.7u50470R174+4.7u50C178+470R176 4.7u50C180C1901u50+R2041KR1962.7K2.7KR1972.7KR198R2002.7K100KR132+100P100PC24310u50C48+R742201W Q113-118 Q119-12410u50C195+1KR20756KR221100KR219C293900PR225 56K100PC193100u10C197+470R223C245 100PR229 33KR226 56K470R224 100u10C246 100PC198+1KR208+C19610u5056KR222100KR220100PC19421C593900PR233100K10u50C210 +56KR2361KR210100PC207R238 56K 1KC212 15P100u10C216 +470R244C250 100PR246 33KC249 100P1KR239 56KC213 15PR245470C215100u10 +R2091K+C20910u50100PC206R23556K100KR232C247 100P+100u10C214C211 15PR237 56K470R2431KR2111K100PC205R23456K100KR231+C20810u50232119R240R241R242214.7KR121KR511KR554.7KR13680R491u50C32+R52 100KR53 47K+C31 22u1610KR5722KR561KR541KR501W21183.3KR135647823 11u50C52+C51 0.1847u50C56 +3.3KR134100KR28815KR13310u50C251 +R135 18K100PC55100K0.01C54100PC53R136+B+B+B190.033C147R137220K39KR129R13139KC631000PC651000P100PC66100R292BBBBBBBBBB B+B+B+B +BBBB4.7uHL110X101+COM/-VB+B+BB+B+BB+B+B+B+B+B+BB+B+BBB +B+BBB+B+BBBB+BB+B+B+B+B+B+BB+B+B+B+B+B+B+BB+B+5V+B +B +BMAIN UNITIC107IC103-44.2V0V0V-44.2V47.2V0V0V6.6V14.9V-15.1V4.9V4.3V0V0V0V0V4.3V5.0VOFF:2.5V10dB ATTMUTE-15.1VOM:2.5VOFF:4.7VOFF:3.7VON:3.6VMUTEOFF:-4.9VON:3.6VOFF:3.7V-10dB ATTOFF:-4.9VON:1.4VMUTE14.9V-6.9V