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故障现象 :开机后 ,按导联选择前进键(ＡＤＶ)和返回键 (ＲＥＤ)均不起作用 ,ＬＥＤ指示灯始终处于测试 (ＴＥＳＴ)位置 :选 50ｍｍ/ｓ时的走纸速度异常 ,实测速度为 2 5ｍｍ/ｓ ,且ＬＥＤ指示灯不亮。分析检修 :根据故障现象 ,首先怀疑加 /减计数器ＩＣ2 12 (ＭＣ14516)工作异
Symptom: After the power on, the ADV and RED buttons do not work. The LED indicator is always in the TEST position: the paper feed speed is abnormal when the speed is 50 mm/s. It is 2 5mm/s and the LED indicator is off. Analytical maintenance: According to the fault phenomenon, first suspect that the up/down counter IC2 12 (MC14516) operates differently