Hi, I have a LeCroy 9450A Oscilloscope.
It has problem about triggering mode.
LeCroy 9450A Oscilloscope displayed "NO or SLOW TRIGGER".
It works well most of times.
But sometime it does not run triggered mode but it run auto mode well.
I can not fix this problem.
Please let me know how to fix this problem without calling maker service.
I have not service manuals for LeCroy 9450A Oscilloscope.
Please give me any advices .

Kishikawa.