示波器触发持续时间失败

我有一个示波器（DSO6054A），它有一个触发问题。
我执行了User Cal，其失败2X，触发持续时间失败，第3次尝试通过。
但是，当设备断电时，“自动”触发功能会丢失，导致无法同步到波形。
每次循环电源时都会出现此问题。
当应用“新”波形并切换“自动/正常”时，触发似乎开始起作用。
我需要更好地理解“触发”电路的功能，逻辑流程或原理图，以帮助进行可能的电路板级修复。
任何帮助将不胜感激。
送修不是一种选择。
按照以下步骤显示非触发波形，闪烁“自动？”
无论设置了什么触发灵敏度，按前面板上的Save / Recall键，然后按显示屏下方的Default Setup软键。
示波器现在配置为其默认设置。
2将示波器探头从通道1连接到前面板上的Probe Comp信号端子。
3将探头的接地导线连接到Probe Comp端子旁边的接地端子。
4按AutoScale。
这样做是一种不可思议的，不同寻常的浪潮，只有当你点击“单身”才能看到它。编辑：Jesse42181于2014年11月19日上午8:55



     以下为原文

  I have an oscilliscope (DSO6054A) which has a triggering issue. I performed User Cal which failed 2X with trigger duration fail, 3rd attempt passed. However when unit is powered off the "auto" trigger function is lost resulting in a inability to sync to the waveform. This issue occurs everytime power is cycled. The trigger seems to begin functioning when a "new" waveform is applied and "Auto/Normal" is toggled. I need a better understanding of how the "trigger" circuit functions, logic flow or schematic anything to assist a possible board level repair. Any help would be greatly appreciated. Sending in for repair is not an option.

Following the below procedure yeilds non triggered waveform with blinking "Auto?" no matter what the trigger sensitivity is set,

Press the Save/Recall key on the front panel, then press
the Default Setup softkey under the display. The oscilloscope
is now configured to its default settings.
2 Connect an oscilloscope probe from channel 1 to the Probe
Comp signal terminal on the front panel.
3 Connect the probe’s ground lead to the ground terminal
that is next to the Probe Comp terminal.
4 Press AutoScale.


Doing this yieds a unastable, unsynced wave which can only be seen if you hit "Single".

Edited by: Jesse42181 on Nov 19, 2014 8:55 AM