Regulated power supply common fault solution
1. Cov khoom siv hluav taws xob tswj tau muaj qhov tso tawm tab sis tsis kuaj tus kheej thaum nws hloov mus.
Qhov no feem ntau yog vim lub hwj chim mov PW-OK teeb liab ncua sij hawm tsis txaus los yog tsis muaj cov zis. Tom qab hloov ntawm lub hwj huam mov, siv lub voltmeter los ntsuas qhov tso zis ntawm PW-OK (8 pins ntawm lub hwj chim ntsaws) nrog lossis tsis muaj +5 V. Lub sijhawm no, koj yuav tsum xyuas seb qhov sib piv LM393 puas puas. Yog tias qhov ncua sij hawm tsis txaus, koj yuav tsum xyuas cov resistor R104 thiab capacitor C60 hauv qhov ncua sij hawm.
2. Kev tswj fais fab tso zis hluav taws xob tsis tso cai
Yog tias tsuas yog ib qho kev sib txawv ntawm qhov ntsuas tus nqi, thaum lwm cov ntaub ntawv yog qhov qub, qhov hluav taws xob ntawm kev sib txuas hluav taws xob hluav taws xob hluav taws xob lossis hluav taws xob rectifier diode puas. Yog tias txhua qhov sib txawv ntawm tus nqi ntsuas, nws yog los ntawm IC1 1, 2 ko taw yuam kev amplifier, R39, C32 yuam kev amplifier tsis zoo tawm tswv yim voj, sampling resistor R33, R34, R35, ua +5V, {{ 8}}V tsis siv neeg voltage regulator tswj Circuit Court muaj qhov txhaum.
Nyob rau hauv kev hloov ntawm kev tswj fais fab mov Circuit Court nyob rau hauv lub thib ob tube yuav tsum tau muab sau tseg, vim hais tias lub inverter khiav hauj lwm zaus yog siab, feem ntau ntau tshaj 20kHz, ntxiv rau lub load tam sim no kuj loj, yog li ntawd lub hwj chim mov nyob rau hauv lub +5 V iav Schottky high-frequency rectifier diode SBD, tus so ntawm lub zog kuj siv los kho cov yam ntxwv ntawm high-frequency rectifier diode FRD. yog li thaum hloov lub rectifier diode nrhiav tib hom kom deb li deb tau kom tsis txhob rov puas.
3. Ntxuam tsis tig los yog rattle
Lub khoos phis tawj tswj hwm lub hwj chim kiv cua feem ntau txuas nrog +12V DC tso zis DC kiv cua. Yog hais tias lub hwj huam mov input thiab tso zis txhua yam yog ib txwm, thiab kiv cua tsis tig, feem ntau yog rau cov kiv cua lub cev muaj zog puas tsuaj. Yog hais tias lub suab, ib qho ntawm cov laj thawj yog vim lub sijhawm ua haujlwm ntev ntawm lub tshuab lossis cov txheej txheem thauj khoom ntawm kev vibration khaus tshwm sim los ntawm tus kiv cua ntawm plaub lub screws xoob xoob; qhov thib ob yog cov plua plav ntau dhau hauv cov kiv cua lossis cov roj bearing roj, tsuav yog lub sijhawm tu kom huv lossis ntxiv cov roj nplua nyeem tsim nyog, qhov txhaum tuaj yeem raug tshem tawm.
4. Tswj pib DC fais fab mov tsis muaj cov zis
(1) T2 thawj sab VT3, VT4 laub raj puas, R54 resistor kuj tus nqi ua loj; (2) ib nrab ntawm DC fais fab mov tom qab tswj tau pib.
(2) ib nrab-txheej hluav taws xob hloov hluav taws xob hloov hluav taws xob hloov lub raj VT1, VT2 tsawg kawg yog ib qho qhib Circuit Court.
(3) anti-bias capacitor C8 muaj peev xwm ua me me los yog qhib Circuit Court.
5. Lub peev xwm tsis zoo ntawm cov khoom siv hluav taws xob tswj tau
Lub peev xwm tsis zoo ntawm cov khoom siv hluav taws xob tswj hwm feem ntau yog tshwm sim raws li: cov khoom siv hluav taws xob hauv lub teeb pom kev zoo, xws li tsuas yog rau lub rooj tsav xwm, floppy drive fais fab mov, tuaj yeem ua haujlwm ib txwm, thiab hauv kev sib tw nrog lub hard drive loj, nthuav tawm lwm yam khoom siv. , feem ntau cov khoom siv hluav taws xob ua haujlwm tsis zoo li qub. Qhov no feem ntau yog lub zog hloov hluav taws xob ntawm lub raj hloov VT1, VT2 kev ua haujlwm tsis zoo, lim capacitors C5, C6 muaj peev xwm tsis txaus. Kev hloov cov lim capacitors yuav tsum tau them sai sai rau lub peev xwm ntawm ob lub capacitors thiab cov nqi hluav taws xob tiv taus yuav tsum yog tib yam.
