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故障现象: 激光唱机通电工作时,拾音器不向内部限制开关处运动,唱片目录不能正常读出。分析检查:激光唱机接通电源工作时,拾音器应向内部限制开关处运动,同时微处理器提供目录SLR(反转)信号到拾音器伺服电路,Q_(103)、Q_(104)、Q_(301)构成开机复位电路,使IC_(301)在接通电源瞬间复位。IC_(301)的(60)脚SLR信号经IC_(101)、IC_(604)、Q_(102)加到拾音器电机,使拾音器向内部限位开关S_(01)处运动。如果这时唱片目录不能正常读出(整个放音期间,显示屏上不显示唱
Symptom: When the CD player is powered on, the pickup does not limit the switch to the inside and the record list can not be read normally. Analysis Check: When the CD player is connected to the power supply, the pickup should move inward to limit the switch. Meanwhile, the microprocessor provides the directory SLR signal to the pickup servo circuit, Q_ (103), Q_ (104), Q_ ) Constitute the power-on reset circuit, so that IC_ (301) is reset on power-on. The (60) foot SLR signal of IC 301 is added to the pickup motor via IC 101, IC 604 and Q 102 so that the pickup moves to the internal limit switch S 01. If at this time record catalog can not be read normally (the entire playback period, the display does not show singing