机型:金鸡1700S单卡收录机故障现象:收音正常、放音时声音有时变调。检修方法:根据故障现象,重点检查电机与机械转动部分。打开机盖,首先测量整机电压,然后检查机械传动部分,均无发现故障。打开电机后盖测调速板各点电压也正常。后来,无意发现计数器转动到第二排时,且出现计数器的齿轮先慢了下来,然后快起来,最后又变成正常。卸下计数器,用无水酒精清洗后晾干、装机 Model: Rooster 1700S single card tape recorder Fault phenomenon: normal radio, voice sometimes tone change. Maintenance methods: According to the fault phenomenon, focusing on checking the motor and mechanical rotation part. Open the lid, first measure the voltage machine, and then check the mechanical transmission part, found no fault. Open the back cover motor speed measuring board voltage at all points is normal. Later, unintentionally found that the counter rotation to the second row, and the counter gear appeared to slow down, and then quickly up, and finally became normal. Remove the counter, dry with anhydrous alcohol, installed