Teeb meem nrog lub zog hloov hluav taws xob ntawm lub rooj sib tham splitter

1. Lub PCB pawg thawj coj saib xyuas seb lub rectifier Circuit Court D1-D4 yog faulty los yog qhib-circuited, seb lub capacitor ntawm lub lim Circuit Court puas puas, seb qhov ntsuas resistors R1 thiab R2 yog ib txwm, seb lub kauj ruam-down resistor R3 yog hlawv tawm, thiab seb tus nqi kuj nce thiab ua tsis tiav (kuaj thaum lub hwj chim tawm).

2. Txheeb xyuas seb BE junction thiab CE junction ntawm lub raj hloov pauv puas tawg thiab luv luv, thiab ntsuas seb cov windings ntawm qhov hloov pauv ntawm lub PCB cais tawm yog luv luv los txiav txim siab qhov zoo ntawm lub raj hloov thiab qhov hloov. transformer (kuaj thaum lub hwj chim tawm).

3. Tshawb xyuas lub rectifier thiab lim cov ntsiab lus ntawm cov zis thib ob winding, thiab tsom mus rau kev tshuaj xyuas seb lub lim capacitor puas bulging los yog puas los tshem tawm qhov ua tau ntawm luv luv Circuit Court nyob rau theem nrab.

4. Xyuas seb qhov nqus hluav taws xob D5, R11 thiab C9 puas zoo li qub (kuaj thaum lub hwj chim tawm).

5. Tom qab paub tseeb tias cov khoom siv saum toj no yog qhov qub, peb tuaj yeem tshem tawm cov hloov hluav taws xob hloov hluav taws xob los ntawm lub inverter thiab ua qhov ntsuas hluav taws xob sib cais. Siv lub ntsuas hluav taws xob kom maj mam qhib thiab kaw.
Raws li tus nqi ntsuas hluav taws xob ntawm lub zog hluav taws xob, lub suab squeaking emitted los ntawm transformer vibration yuav tsum tau hnov ​​nyob rau lub sij hawm no. Yog tias koj tsis tuaj yeem hnov ​​​​lub suab vibration, siv multimeter los xyuas seb puas muaj DC voltage ntawm 12v-16v ntawm qhov zoo thiab qhov tsis zoo ntawm cov khoom siv hluav taws xob uc3844.

6. Tom qab paub meej tias qhov voltage ntawm uc3844 fais fab mov davhlau ya nyob twg yog qhov qub, siv lub oscilloscope los xyuas seb puas muaj PWM nthwv dej tawm mus rau qhov kawg ntawm uc3844 tus pin 6 hloov raj (nyob ntawm cov qauv sib txawv, qhov zaus ntawm qhov PWM yoj feem ntau nyob nruab nrab ntawm 20khz-100khz).