高手翻译一段文字 电子类的 谢谢

来源：百度知道 编辑：UC知道 时间：2024/05/30 03:59:01
现象描述：
electric relay holding position第一次开机，继电器有吸合动作，5秒后自动关机，需开关3次以上才能正常，第2天故障又重复出现。

原因分析：
此机型，开机5秒保护，通常故障来自U板，DG板，IC1001不良和Q854保护动作等相关原因。

检修过程：
首先替换U板，DG板，排除了不良的可能。查Q854从开机到保护时的电压变化，测集电极2。4V正常，U板A1002—9脚保护端没有动作，测IC1001的电阻无短路，2脚输入端为4。3V，在自动关机前有缓慢上升，正常值应是IC2703三端稳压提供的5V电压，1脚无输出，多次开关能建立4V多电压，可开机。初步认为5V供电不稳定；沿着此供电回路顺查：IC1001—IC2703---A1，D1插排---D860，发现D860整流输出电压只有5。1V，明显低于6。3V正常植；续查，C858—1000微法电解失容，导至6。3V下降，引起IC2703，IC1001工作电压下降且不稳定，IC1001无5V输出至U板，引起自动关机。

提示：
34P700G，所用JAMICON标识的电解，已发现多处鼓包失容导至的故障；如L板C36O不良---图像和蓝屏下有水波纹；待机电源处C883不良---待机7。5V下降到5V，开机继电器反复吸合断开，带负载能力差，以上均有3台故障修理事例。

Electric relay holding position first boot, relays have a suction action, five seconds after the automatic shutdown, the need to switch more than three times normal, two days and repeated failures.

Analysis:
This model, five seconds of boot protection, usually from failure U plate, DG plate, and Q854 protection IC1001 adverse action, and other related reasons.

Repair process:
First U replacement plate, DG board, ruled out the possibility of adverse. Q854 investigations protection from the boot to a change in voltage, the measurement Collector 2.4 V normal, U-9 foot plate A1002-protection movement has not measured the resistance of IC1001 no short circuit, input 2 feet for the 4.3 V, in the automatic shutdown Before, there was a slow rise, the normal three-IC2703 should be provided by the 5 V regulator voltage, output without a foot, repeatedly switching to build more than 4 V voltage can be boot. The preliminary view of 5 V power supply instabilit