We are trying to repair the single (X) channel AMT from our Inova-600. Apparently the cooling fan failed and caused an overheat condition that fried some thermal fuses. But we can't seem to get the overheat logic to go back to a green light condition, even after replacing the thermal fuses. Here is what our electronics engineer wants to know:
We have a Harley AMT amplifier, Model 3900-1S, is not working due to the cooling fan failure which caused overheat condition. The red LED (overheat) is lid on the front panel. We found one thermal fusible switch on the RF module heat sink and replaced it. We also found another one thermal fusible switch on the heat sink of the big transistor bank and replaced it. However, it still has the red LED (overheat) lid, and the power supply to the RF module is cut off. Is there another thermal fusible switch somewhere else in the system such that the logic function still disables the power supply to the RF module? Please help.
Best regards,
Kevin Bao, Ph.D.
Chemistry Instrument and Electronics Facility (ChIEF)
Received on Tue May 12 2015 - 07:40:04 MST