The carefusion failure analysis technician examined the driver power module assy and found that it does not operate.Installed driver power module into a known good 3100a test vent and found that the driver did not operate when the start/stop button was pushed.Noted that the led on the p.W.M.Module was very dim red and did not change to green.Replaced the p.W.M.Module with a known good p.W.M.Module and found that the 3100a test vent now functions normally.Duplicated, the unit won't start and the oscillator stopped alarm will sound, complaint allegation.
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