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故障现象:无字符显示。分析与检修:彩电无字符显示,一般是因行、场脉冲丢失或字符显示振荡器损坏而引起。但此例却有一定的特殊性。参照图1。用示波器测微处理器 IC001(ZP023306)(26)脚的行脉冲幅度为5V(正常),但(27)脚的场脉冲幅度只有1.5V(正常应为4
Symptom: no character display. Analysis and overhaul: Colorless character display, usually due to line, field pulse loss or character display oscillator damage caused. However, this example has some particularities. Refer to Figure 1. The pulse amplitude of the foot of the IC microprocessor IC001 (ZP023306) (26) is 5V (normal), but the pulse amplitude of the foot of (27) is only 1.5V (normal should be 4