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先检查并更换503kHz晶振无效,后重点检查AFC控制环路,发现IC501(TA8783N)輧輶訛脚外接积分电容C405(0.02μF)虚焊。重焊后故障排除。
First check and replace the 503kHz crystal invalid, after the key check AFC control loop and found IC501 (TA8783N) 外 輶 Erocode external integration capacitor C405 (0.02μF) Weld. After welding troubleshooting.