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一、电源部分 1.由电源(取样)可调电阻引起的两种常见故障例一故障现象:声音正常,图像整幅缩小(但正常),屏幕显示如图1所示。分析:引起此故障的电源可调电阻多为封闭式,而且塑封型的居多。所以,动片及滑动触点氧化变值而电源输出电压偏低(有的机型是8V或9V左右)。常见机型:熊猫DB44H3—5型(7W1—470Ω)。
First, the power part 1. By the power (sampling) Adjustable resistance caused by two common failures Example A fault phenomenon: the sound is normal, the image is reduced (but normal), the screen shown in Figure 1. Analysis: Caused by this fault power adjustable resistance and more closed, and most of the plastic type. Therefore, the chip and sliding contact oxidation variable value and the power output voltage is low (some models are 8V or 9V or so). Common models: Panda DB44H3-5 type (7W1-470Ω).