例1 台湾菲利浦MKH-320机芯台式音座。故障现象:载片机构进、出功能正常、合仓正常,能显示“OPEN”和“disc”。但放音功能不正常。分析与检修:因载片机构进、出功能正常,合仓正常,说明系统单片机MC68HC05CB/P302功能正常,电源部分也应无问题。检修的重点应放在伺服控制电路部分,可采用“触摸法”。以左手接触+12V供电端子,右手握一小起子的金属部分,分别触及TCA0372集成块的脚和脚,发现光头组件摇臂不动,无聚焦 Example 1 Taiwan Philips MKH-320 movement desktop audio seat. Symptom: Slice mechanism into and out of the function of normal, together warehouse normal, can display “OPEN” and “disc.” But playback function is not normal. Analysis and Maintenance: Because the carrier body into and out of the function is normal, the normal position, indicating that the system microcontroller MC68HC05CB / P302 function is normal, the power part should be no problem. Maintenance focus should be placed on the servo control circuit part, you can use the “touch method.” Touch the + 12V power supply terminal with your left hand, and hold the metal part of a small screwdriver in the right hand to touch the feet and feet of the TCA0372 manifold respectively, and find that the optical head assembly does not move and focus