Keysight Technologies Infiniium MSOV 084A, Service Manual

Page: 71 / 164

Troubleshooting
4
Infiniium V-Series Oscilloscopes Service Guide 71
Apply AC power and turn the oscilloscope on if it does not start up on its own.
Notice whether the trigger ICs fan is turning. If it is not, replace it and redo this
part of the diagnostic test. If it is turning and the oscilloscope still turns off again,
then consider these possibilities:
• If the trigger ICs fan was turning, the problem is most likely that the rotation
sensor on the ICs fan is defective. Replace the trigger ICs fan and redo this part
of the diagnostic test.
• If the oscilloscope stays on after you reset the shutdown logic (by removing AC
power for 30 seconds) and powered it back on, then you have fixed the
shutdown problem.
• If the oscilloscope shuts down again after you have replaced the trigger ICs fan,
then the problem could be that the rotation sensor for all the fans located on
the backplane assembly failed, so replace the backplane assembly and redo
this part of the diagnostic test.
Trigger ICs fan on backplane assembly