长虹NC-6机芯彩电偏转扫描系统故障检修（下）

?¤??NC-6?ú????????×??¨?è?????????ì???¨?????¤?????¨??????27??????°???????????11?????ú??????????20·????ó?????????????????????????????ó???ú?????ì???????¤??±???????15·??????°?ú?????¤?????¨?è?????????????ó???????¤?í±????????????????¤?à?????¨?????????????????ù??OTL?????????¤×÷???í?????????¤?????????÷TA8427K4?????????????????¨·ù?????à???ê???ú×????ó????????????°??????¤????4?¨??????????????Q3???????¨?????????????ó???¤×÷?±?????ú?????????????ò?????????????????ò??TA8427K??Q3?????¨??±??????ò?????§?à???????§?§??????TA8427K?????????ó???????????à??TA8859P8??(·???????)??TA8427K2???????????????¤?????±????·?±???1?±1V??14V????????????????TA8859P8????????????TA8427K2???????à?????????????÷???÷?????????????±??·?????OTL????????·??ó?÷???????°??????????????±?????±??¨?????ó???÷?±?????????¤×÷??????????????????????4??TA8859P8????????????TA8427K4??????????Q2b????
??????????c?????????????±TA8859P8????????????Q2?????±??Q3????±??????¨??Q4?????????????ì?¤×÷?????????±TA8427K2?????????????ü????????VCC?????????????????????????????·TA8859P6?????±?÷??·??????·???à??TA8859P8????TA8427K2?????????????????????????????????±?÷·??????·????????TA8859P6???????°?ì×??ó???????¨??±?????????C319??C305???±?ü??C319?ó??????????????????12????????·ù??????????·????????ò????TA8427K4?????????????????¨????·ù??????????·ù???????·?§?÷??TA8859P6??????·????????????????????????????????????????????????§?§?????¤?éTA8427K?????????§?§???????????¨?÷???ìTA8427K4???????????¨????·ù????2?±1Vp??p???¤??NC??6?ú?????±?¨?è·ù??????CPU?¨??I2C×?????????????????TA8859P??M??????S?????????±?????????????¤×÷???°?÷???ê????TA8427K4???????¨????·??????ó??×??????????°??3?????ò??×·????????????????????????????27V????????????C306????????????2200??F???????????ú·ù????3300??F/25V?????????ó????????????????????13??????±???????????????????????×????¨?è??????????????±??????à?????????????ù?è?????????????????à????
??????????????????????????????????????????????????×????á????????????±??????????????????ò???????????ó???????ó?????????????????????ó?ü???÷?????????????±?÷???ó???????????????????????????·???????¤??NC??6?ú????????????(??????????DQF)???·????5????L450??T401??L401??C402??C400×é?????????¨±????÷T46110????????????????L450??T401??????×é·????????????ú?ú???????¨???????¨??25±?????±????÷T401±?????????????????×é????1000Vp??p????????????????C402??L401??·??????????×???¨????C400????????????????????????T4613????????FV?±?÷?????????????÷?????????????¨?è±??????????§????????·ù???????ù???ú???????????¨?÷???ìT401??????×é?????¨?????¨??????????????×é???????????ì?éC402????????T401??????×é???·??????????ר??±????÷?????????ò???????·??????°????????????ó???????????????????????????????????????ò???????????????????????????????????±?÷??×è±ê×??ó(??82??)???á?????????????ú??????????????14?????????????ú?????????????????????????ú?????????¤??NC??6?ú????Y???????í????????LTI(????????????)??SSC(??????????)??VM(?¨?è?????÷??)???·?????????
???????????×÷??????±???×????÷???ó??????????±??????????????÷°?±??????ú?ú??±??§????????????????????SSC???·??×÷??????±??????????????°?????±??????°×????????±??????á?????¨??????????????±??????????????????°???????ü????????VM???·??×÷??????±???×????????¨?è?????????????????????ú??????·?????????????????×÷???ú?ú?????ì???????????????ò??????????SSC???·??VM???·?à????????SSC??VM?????????í????????????/????/??×?×é??????TA1222AN?????ü????·??è????VM???????·????6?ù????·???????×é?????ù??SSC??VM??????????????·???????SSC???·????VM???·??????×???±????????????????°??????????????°?????????M702??VM???????·?????????????ú??????±??????????????????????¨?è?????÷?????·??????????VM???????·???????¨?÷???ì??6VM°?Q705b??VM?????¨???????????÷TA1222AN??VM?????????????·?ê????????????VM???????·???????????ì?é???é??VM????????????C720?§????·??????????ü???ó???ú????????????????6??????VM??????Q705??Q706??????????Q707???à·??ó·??????·?????·?±????????????Q710b?????í???·????Q720??Q719??????????????Q709b??????TA1222AN{48}????????????VM?????±??
??Q707???à·??ó??c????????????VM??????Q709??Q712??????Q710??Q711???¨????115V??????C720?????????????·????115V?úR736?úQ711?úL704??L702?úVM?????úC720?ú??????°?????TA1222AN{48}????????????VM????????Q707???à·??ó??c????????????VM??????Q710??Q711??????Q709??Q712???¨??C720·?????·????·??????C720?????úVM?????úL702??L705?úQ712?úR740?ú???úC720??????VM?????????????????±??????±????÷??VM???????¤·???????????????????×??????ú?ú??????????????????×????¨?è?????????÷????????????×????????¨?è????????????????±?????·????????ò?????????á?????????????ú?????????¨?????????í·???????·?????VM???·????????????OTL???????????????????????????ù?????????·?????????±???¨?????????????·?????á????????(??????????)?????·?±?????????¤×÷???ò??±?????C720???·??VM?÷??×÷?????????????§??????????15?????????????????¨?????????°????????OTL?????????????·??????±????????????????¨?è???????????????????????????????????????¨?è??????????·?????????????????????????OTL??????c?????????á?????¨?è???·?§???????±?????????????¨?????±?????á??????·?·?????·ù?????????ú?????????§
?????????ù????4?ù??OTL???????¤×÷???í?????ì????????????Q3???¨???????¤???????????????¨?±???ó?????????????±?????????????????????¨?????????????¨???????????????????????ò???????????????????¨??????OTL?????????·???????????????±???°?ì?????????¨?±?????ò?????????????????????????????????????¨?±???????????????????????????¨?±?????¤?????????????????¨?????????à??????????4???????¨?è??????27V??????D301??TA8427K3??OTL???????????????±??27V?????¨????7??1?????¨??×???????C308????????C308?????¨????27V???????¨?è????????×????????¨7??6????????????????C308?????à????D301??????C308??????3??OTL??????????????????2VCC=54V???????ò???????¨±?????????????????×???????????C308????????????D301??????????×??????????ì?éC308??D301??·???D301·??ò???????ü???ó???¨???????§???¨?ê??????