*Precision Dose Controller failed and pulled out from Varian Kestrel Proton machine.
*The owner doesn’t have a clear failure info, just said unit have error.
*Powered up the unit and explored, discovered a self test option and run.
*Unit failed self test.
*Removed cover then performed components level troubleshooting.
OPEN link below for tips in troubleshooting without schematic.
>>Troubleshooting without schematic
*Found one defective IC , confirmed self test pass after replaced.
*Saved USD 10K.
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