T2988P型机维修实例

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??1?????????ù???????ó:???ú???ù????????·??????ì??:????C831??????????0V????????????V823????????????0V???????????????÷???¨??·???????R882?????????÷??????????????0V??????R882×è?????????ü??R882?????ú????????????2?????????ù???????ó:???ú???ù????????·??????ì??:????C831?
?????????12V????????????V823????????????300V???ù????????0.14V(????????0.4V).?ò??V823????????????300V?????????????÷???¨??·??¤×÷??????????????????????·?.????V824????????????0.3V??(????????-4.0V),?ù????????0.3V(????????-14.0V),·???????????0.9V(????????-14.5V)?ù??????.?ì?éV824???§????,·???V824B,C????????C833?÷?????·.?ü???ó???ú??????????±??????????ò???ò??C833?÷??,???÷??R827?????÷???ó,C822???ò???????????ó,V822???§??×è????,????????V823???ù?????÷???ó,????V823??±??????¨?±???ó?ó????,?ò??C831????????????12V.??3?????????ù???????ó:???ú???ù????????·??????ì??:????C831??????????0V????????????V823????????????300V.???????÷???¨??·??¤×÷?????????????
?????????·?.??????????V823??·????¨?·????C820??????0V.??????+0.1V,?ù??????.?ü??C820?ó????????.±????????ò??C820?§?§,????·?????????????V823????,115V????±???0V.??4?????????ù???????ó:???ú????????,???ù,???ú????????.·??????ì??:???ú????±í?÷??????????°???????,???????????????í?÷??·?,±??¤???·??·??ò???ú???????·??·?.????C831??????????56V,?·?????????????????ú×???.????V471(?????è),C831????????????56V,?¤?÷????????±??¤???·??.????MPU34????4(??????0V),33????5V(????),°??????÷????×÷??,???÷??????MPU??·?.????MPU40??????4.5V(????),39??????2V(??????4.5V),?????ì?é39?????§????,·???39??(SCL)????±??¤??????VDA04????,?ü???ó????????.??5?????????ù???????ó:???ú????????,???ù,???ú????????.·??????ì??:???ú????±í?÷???????????????ú×???.???ú?ó?????????ú×????????????ò??:?????í?÷??????,??34????????????;???ú???????·??????,?ì?????????????????????ú×???????·¨×????????¤×÷×???;????????115V?????ò10V???????????÷,??????????????27V???????÷,??????????????13.9V????????????±??¤???·??×÷.????C831????56V????,±í?÷?·?????????ú×???.????V471(?????è)??????????????.??C831??????????????115V.?ù????????????????????????????,????N301(TA8427K)2????????0V(????????14.8V),???±·???N301·???,?é2?????§??????·????ì??,?ü??N301,????????.±????????ò???????????????·T8427K???????·,?ì?????÷???ó,
??27V???????÷????±??¤???·??×÷.??6?????????ù,??à?à??ù???????ó:???ú????????,???ù,???ú????????,????????4?????????????÷?ü????·???à?à??ù.·??????ì??:????C831????????115V??97V????±???.???????à???????·???¤×÷?????????é?????·,????TA8880CN 5?????¨?è??????????9V(????),????6?????¤?????????????±?÷??????2V,???????¤????V402????????43V,?ù????????0V(??????0.3V).????????V402?ù????×èR411,?ì?éR411,·?????±???????,?ü??R411?ó??????????7?????????ù,??à?à??ù???????ó:???ú????????,???ù,???ú????????.·??????ì??:????TA8880CN 5?????¨?è??????????0V.?????????¨?è???????·?ì?é .????V870·???????????0V,V870?ù??????(VD874.VD878?????à??????????????????)??0V,???ì?éR879(??????VD874.VD878?????÷??×è)??±??????·.?ü??R879,????????.±????????òTA8880CN?????????÷????????????????????????????.??8?????????ù,??à?à??ù???????ó:???¨????,?????????¤?±??×??????ú,???ú?????ó???????°à??±?????÷???ü???ù,??×????????¤;???¤??????,??×??????ú,????×??????ú?????°à?à??????±?ù.·??????ì??:?ù?????é????????CPU?ò??IC???·??????I2C×????????ò×??????????·?????????ì????.?×??????NA01(TMP87CM36N)CPU39??(SCL)??????4.5V.??????,40??(SDA)??2.3V??4.5V±???(??????????±???4.5V)????NA01??39,40?????????·,??40????????????.????CPU??×?????????????.????39,40 ?????????·,??·???????·¨?°??39,40??????????IC??×???×??ó????AV????°?(TA8851BN)?ó??????????9???ú?????????¤,????×??????ú???????ó:???ú?????????¤????±??¤???·?¤×÷,×??????ú.·??????ì??:???ú???????????¤×÷,×??????ú?ó????C831??????????56V???÷?????????
???,±??¤???·??×÷?????????èV471,C831??????????115V?????????????í±?,???????¨?è???·??????.????V471??????±??¤???·VD490,C831????????????115V,?¤?÷±??¤???·??×÷?????????¨?è????27V???÷?ù??.????N304(TA8427k)?????????????·2????????15V(????),4????????0.5V(????????1V),?????ì?é4??????????C314????±???,?ü???ó????????.??10?????????§?§???????ó:?????????÷°????????ü??????×÷??,????????°?°??ü????.·??????ì??:?ò????°?°??ü?¤×÷????,±í?÷CPU?????????????????????????÷±??í?ò?ì???????°OPT901.????OPT901??2??????,°????????÷?????ü??2????????·?±???(????4.1V-3.9V±???)????±??????????°??.??11 ???????????????????ó:???ú?ó????????????????.·??????ì??:?????????????????????¨?è???·????????????????N501(TA8880CN)64?????¤?????????±?÷??????3V(????)??????N302(TA8859CP)13???±?÷??????2V(????),????N301(TA8427K)4???±?÷??????1V(????)7????0V(????????1.9V),????N301?????ü???ó???§?????????ì?éN302,????15????????5.4V(????????5.8V),?ü??15??????????C322,????????????12 ???????????????????ó:???ú?ó??????????????????????????.·??????ì??:????N501(TA8880CN)64??,N302(TA8859CP)13???????ù????,????14????????????,?????¨?÷???ì15???¨??,???????¨?¨??.?ü??14??????C321?ó????????.±???????????TA8859CP??????·??ú?÷????????C321?§?§,???????¨???????·?????????¤×÷,?ì?????¨?è???????·???¤×÷,??????????????????.??13 ???ú°é??×??ó???????????????????ó°é?????????????ó:???ú?ó°é??×??ó??°é??????×?·????????????±??????????0?±???ù???ó??1???±°é????±?×??ó?????????ó?¨???±??????°é???????????????÷??????????·??????ì??:??????·???????T2988P????????????CPU??I2C×?????????°é?????
í?éTA8776N?????????ü??????L R?ù?????ó????????????·????ò??????????·???????????????×?????TA8776N?????????????ó°é????????????TA8776N°é?????í°??ó??????±???????°é?????í°???×???????????????°????¨?????????????ü??CPU???????÷?????????????????????????????§???????±????·??????????ú?±TA8776N??15????????????9V?¨??????12V????°é???????ó??????????12V???????ì?é????°???N860?????÷1????????????????10V?¨??????16V????L860??VD862??ZP82??????????·???ZP82±?????×è??0.12?????ó??4.5???????ó??????????