Overhaul ntawm STR-F6454 Switching Power Supply
STR-F6454STR-F6454 yog ib qho tshwj xeeb tuab zaj duab xis Circuit Court rau hloov fais fab mov uas tsim los ntawm Sanken, muaj oscillation circuit, dhau-tam sim no, dhau-voltage, voltage regulator thiab switching mem tes amplification circuits. Cov yeeb yaj kiab tuab hauv Changhong CN-11 txav xim TV (H25K6O, 25Kl8, 29Kl9, C-29E6 thiab lwm yam qauv) hauv daim ntawv thov ntawm lub voj voog qhia hauv daim duab. Cov kauj ruam kho dua tshiab rau qhov kev txav no xim TV rov hlawv STR-F6454 yog raws li hauv qab no:
1. Xyuas lub rectifier lim Circuit Court yog tias lub fuse yog blackened thiab STR-F6454 (NQB21) tau tawg thiab puas, koj yuav tsum xyuas lub rectifier diode VD801A ~ VD8O4A, surge absorbing capacitor C805 ~ C808, +300V filtering capacitor C810, spike absorbing capacitor C811, C827 (qee tus qauv tsis muaj C827, R823, R824, UB822). UB 822).
2. Tshawb xyuas STR-F6454 (4) ko taw sab nraud Circuit Court STR-F6454 (4) ko taw rau cov khoom siv hluav taws xob pib hluav taws xob, qhov hluav taws xob ib txwm yog 18.2 V. Yog tias ko taw ntawm qhov hluav taws xob tsawg dua 11 V thiab ruaj khov, tom qab ntawd xyuas V801, VD808 (l8V), VD803 (22V) thiab lwm yam khoom raws li cov tub ntxhais ntawm cov hluav taws xob hluav taws xob tswj hluav taws xob; Yog hais tias qhov kev hloov pauv ntawm lllV ~ l5V, uas lub Switching fais fab mov tau vibration, ces xyuas lub switching transformer thib ob rectifier, filtering Cheebtsam thiab load circuits nrog los yog tsis muaj short-circuit tshwm sim, tshwj xeeb tshaj yog cov kab Circuit Court.
3. Txheeb xyuas qhov ntsuas hluav taws xob tswj lub voj voog yog tias lub zog ntawm lub sijhawm + B voltage ntawm 160V maj mam poob mus rau xoom, tom qab ntawd xyuas cov khoom siv hluav taws xob tswj lub voj, koj tuaj yeem hloov lub optocoupler N830, thiab tom qab ntawd hloov qhov yuam kev amplifier N831, nws yog Qhov zoo tshaj plaws los xyuas seb R807 yog qhib-circuit.
Tswv yim: IC's (4), (5) taw ntawm sab nraud Schottky diode AKO3. kho tej zaum yuav tsis raug ntsia rau hauv no diode, los yog hloov nrog RU2, RU4, 55295 thiab lwm yam diodes.
