PTC: Yuav ua li cas mus saib rau serviceability?

Nyob rau hauv feem ntau CRT TVs siv degaussing system, uas yog kev PTC. Yuav ua li cas mus xyuas ib tug Circuit Court nyob rau hauv cov ntaub ntawv ntawm tsis ua hauj lwm los ntawm koj tus kheej, koj yuav tsum paub, xav mus nqa tawm kho rau lawv tus kheej cov tswv. Caij muaj lub zog uas yuav xyuas li ib txwm ohmmeter.

caij zog

Nws yuav tsum xav txog dab tsi PTC yog, yuav ua li cas los ntsuam xyuas nws nyob rau hauv ib cov saw - yuav ua tseeb tom qab. Qhov no lub caij muaj peev xwm sawv ntawm hloov chaw nyob ntawm kub. Nws lub cev kom muaj nuj nqis ntsuas kuj. Thaum chav tsev kub qhov tseem ceeb ohmmeter qhia units los yog kaum ntawm ohms.

Thaum rhuab, cov kuj nyob rau hauv lub loj tog pib hloov. Qhov tseem ceeb ohmmeter twb qhia pua pua ntawm phaus, thiab hais tias lub cev lub xeev ntawm lub caij - ib tug puas PTC. Yuav ua li cas rau kos yog hais tias muaj yog ib tug suspicion ntawm ib tug faulty Circuit Court? Txoj kev uas daws qhov teeb meem no yog qhia hauv qab no.

Vim nws cov khoom PTC thermistors yog lug siv nyob rau hauv microelectronics rau ntau lub hom phiaj:

• Fais fab kev tiv thaiv Circuit Court. Nrog nce tam sim no noj heats caij thiab kuj nce mus rau ib tug tshaj plaws, thaum muaj tam sim no cutoff.
• Cov cua kub circuits. Tsaug rau lub PTC thermistor yog DVR automatic cua kub tswj system.
• Nyob rau hauv circuits ntawm kub sensors.

Lub puab neeg ntaus ntawv

Resistor hloov nws kuj mus tshav kub, raws li tau zoo raws li PTC. Yuav ua li cas mus xyuas tus thawj yam khoom? Nrog rau qhov no yooj yim. Resistor qhov tseem ceeb ywj faj ywj fwm tsis pub dhau ib tug me me ntau yam. PTC thermistor yog tau los thaiv kiag li tam sim no dhau los ntawm nws raws li temistor. Tsuas yog tus tom kawg muaj ib tug rov qab sib raug zoo rau qhov kub thiab txias.

Yuav kom paub yuav ua li cas mus saib hauv lub serviceability ntawm PTC thermistor, koj yuav tsum txhais tau nws cov ntsiab kev ua tau zoo. Cov muaj xws li:

• Nominal kuj ntawm ambient kub (feem ntau yog 20-25 degrees);
• switching cov kuj yog txiav txim ntawm tus taw tes ntawm cov yam ntxwv ntawm kuj dependence rau kub, thaum thawj parameter yog nce los ntawm 2 lub sij hawm muab piv rau lub nominal tus nqi;
• lub siab tshaj plaws voltage ntawd mas lub caij tsis muaj ua hauj lwm;
• tam sim no load qhov tseem ceeb: nominal switching, lub siab tshaj plaws tau thiab overturning; mus xyuas cov tsis muaj ib qho tseem ceeb yog hais tias qhov PTC thermistor yog siv nyob rau hauv high-precision circuits.

Caij nyob rau hauv lub demagnetization Circuit Court

Yuav ua li cas mus saib hauv lub PTC rau TV? Cov lus teb rau lo lus nug li nram no los ntawm lub hauv paus ntsiab lus ntawm nws cov lag luam. Lub txhaum caij duab distortion yog manifested los ntawm magnetization. Yuav kom tshem tawm no kho raws tsim daim phiaj cov ntxaij vab tshaus siv nyob rau hauv series nrog lub PTC thermistor. Qhov no tsim yog hu ua tus txheej voj, yuav tsum vov tag nrho cov nto ntawm qhov screen los ntawm lub sab hauv.

PTC yog feem ntau kev sib khi hauv lub screen daim npog qhov ncauj Circuit Court uas complicates nws on-site soj ntsuam. Ua ntej cov kev ntsuam yuav tsum tau kaw-off tsawg kawg yog ib kawg ntawm daim phiaj. Qhov zoo tshaj plaws kev xaiv yuav tsum muaj ib tug ua tiav extraction ntawm lub Circuit Court.

Rau ib txwm siv lub caij cua kub los yog los ua ke chav. Mus xyuas tsis sab nraud cua kub yuav tsum tau mus sib sau ua ke Circuit Court daim duab thiab txiav txim seb lub npav hom PTC. Tswv yim los ntawm lub ntaus ntawv nameplate cov ntaub ntawv txheej txawv tebchaws tam sim no lub caij thiab lub coj kub.

Serviceability thermistor yuav arbitrarily teem thaum tshuab cua sov. Yog hais tias tus kuj tsub kom, ces haum rau lub caij. Txawm li cas los, nyob rau hauv no embodiment nws tseem yuav tshwm sim ntawm erroneous kev xeem. Vim hais tias cov kuj Circuit Court hais mas nws txawv nrog lub hnub nyoog, ua rau khov ntawm cov los ua ke ua hauj lwm.

Vim li cas peb yuav tsum tau ib tug system nyob rau hauv CRT?

Nyob rau cov tshooj TV hauv tsis muaj degaussing system duab yuav distorted nrog ib tug me ntsis cawv ntawm lub electromagnetic teb. Nws radiate tag nrho cov khoom siv, lub ntiaj teb nto riddled nrog pom tsis.

Txij li thaum amplifiers, loj hais lus, lub cua sov ntsiab yog feem ntau nyob rau tom ntej mus rau lub TV. Tsis muaj ib tug kev tshuaj ntsuam daim npog qhov ncauj duab yuav tau mus tas li distorted. Nyob rau hauv thawj zaug ua hauj lwm ntws los ntawm lub PTC thermistor me me tam sim no tsis ua cua sov nws. Thaum zoo li no daim npog qhov ncauj yog lub cev muaj kev nyuaj siab sawv los ntawm lub teb.

Nws yog ib qho thov magnetic teb thiab demagnetize lub daim npog qhov ncauj thaum lub sij hawm uas muaj txoj siav lub TV. Feem ntau qhov no yog nrog los ntawm ib tug lub suab piv rau ib lub tshuab rau lub nruas. Qhov loj qhov screen loj, ntau dua qhov lub suab ntawm suab. PTC thermistor ntawm no taw tes kis tau los ntawm ib tug high-amplitude tam sim no, yuav ua rau nws sov. Kom nyob rau hauv kuj tshwm sim thiab lub Circuit Court caij locks.

Options txhaum nyob rau hauv daim duab hlab

Thaum xub thawj muab rau los yog cov duab distorted thiab lub ripples cai bands, ces ib tug siab ntau yam txhaum posistor. Yuav ua li cas mus saib hauv lub multimeter caij nyob rau hauv cov saw hlau? Nyob rau hauv txias Circuit Court yog yooj yim los mus ua li cas, vim hais tias cov thermistor kuj mus rau ib tug tsawg kawg nkaus.

Feem ntau soldering hu tsuas poob tawm ntawm lub sij hawm ntev ua hauj lwm. PTC yog hais txog lub ntsiab ntawm lub tswvyim, uas yog tas li ua hauj lwm nyob rau hauv ib tug rhuab lub xeev. Ib ohmmeter check screen daim npog qhov ncauj kev twb kev txuas nrog lub thib ob davhlau ya nyob twg ntawm thermistor ob txhais ceg. Yog hais tias nws yog ib tug tsawg kawg nkaus, nws qhia tias ib tug ruaj ntseg kev twb kev txuas. Tej zaum lub caij tsis ua hauj lwm rau ib tug txiav-off.

Yog hais tias lub PTC thermistor yog cov thiab luv luv-circuited, thawj thawj zaug koj tig mus rau ntawm fuse Burns tawm lub hwj huam mov. Yog tias nws tshwm sim tsis khees luv luv Circuit Court nyob rau hauv cov saw hlau, xyuas tus txhaum yuav tau kiag li disabling lub screen daim npog qhov ncauj thiab PTC.

Caij nyob rau hauv cooler saw

Yog hais tias tsis rhuab rear ntawm lub thawv txias - radiator, ces nws tus kheej-kho yuav tsum tau paub yuav ua li cas kom paub tseeb lub PTC. Lub tub yees tej zaum yuav siv 2 hom actuators: ib tug PTC thermistors nrog electromagnetic relays. Thawj feem ntawm lub zog siv los ua cua sov tsis nyob rau hauv cov kuj caij, lub thib ob tsawg txhim khu kev qha, tab sis tsis rhuab.

Feem ntau cov PTC nyob rau hauv tub yees yuav tsum muaj ib tug tsis kam ntawm txog 20-30 ohms. Nyob rau hauv lub rhuab xeev tej zaum yuav ob peb kilohms. Yog hais tias qhov tseem ceeb yog considerably siab tshaj qhia, ces lub caij yuav tsum tau hloov. Nws yog ib qho tseem ceeb los mus muab cov thermistor kom txias rau chav tsev kub ua ntej ntsuas.