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徒弟:北京8320—2型(三洋83PG机芯)彩电出现“电源不能启动”故障,师傅!如何分析检修? 师傅:该机开关电源的开/关是由以微处理器TMP47C433AN为核心的遥控系统电路控制。其控制电路由+5V电源电压产生电路(由T_(371)副电源变压器,VD_(370)、C_(700)整流滤波,V_(700)稳压电路组成)和微处理器TMP47C433AN⑧脚(电源开/关控制端)及外围控制电路V_(751)、V_(701)和光电耦合器E_(315)等组成(参看图6)。
Apprentice: Beijing 8320-2 type (Sanyo 83PG movement) color TV appears “power can not start” fault, master! How to analyze and repair? Master: The machine switching power supply on / off by the microprocessor TMP47C433AN as the core of the remote control system Circuit control. The control circuit is composed of a + 5V supply voltage generating circuit (composed of T_ (371) secondary power transformer, VD_ (370) and C_ (700) rectification and filtering, and a V_ (700) voltage stabilizing circuit) and a microprocessor TMP47C433AN pin / Off control terminal) and the peripheral control circuit V_ (751), V_ (701) and optocoupler E_ (315) and so on (see Figure 6).