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录像机的电源电路是整机的能源供给系统,它提供给各电路系统的电源电压。在维修录像机时,很多情况要先对电路的电压进行检查。若发现电压不正常,往往涉及到电源电路。录像机的电源部分的温升较高,且直接与 220V市电有关,因而是整机电路系统中故障率较高的部分,成为检修的重点。早期的电源电路大多采用传统的降(变)压整流、滤波、稳压程式电路,具有简单、可靠、无辐射干扰等优点,缺点是功耗较大、温升偏高,容易损坏质量较差的大功率稳压管或稳压集成电路等器件。目前少数新型录像机(如夏普VC-A62 DT、VC-K88/K89等)仍采
The video recorder power circuit is the machine’s energy supply system, which provides power supply voltage to each circuit system. In the maintenance of VCR, in many cases, first check the voltage of the circuit. If you find that the voltage is not normal, often involving the power circuit. VCR power supply part of the higher temperature, and directly related to the 220V electricity, which is the whole circuit system, the higher the failure rate, a maintenance focus. Most of the early power supply circuits adopt traditional methods of voltage drop rectification, filtering and voltage regulation, which have the advantages of simple, reliable and non-radiated interference. The disadvantage is that the power consumption is large, the temperature rise is relatively high, and the quality is easily damaged Power regulator or regulator integrated circuits and other devices. Currently a small number of new VCRs (such as Sharp VC-A62 DT, VC-K88 / K89, etc.) are still mining