Low and unstable mA on an EBT C150
Symptom
Low and unstable mA on an EBT C150 Beam current is low, and fluctuates so that tuning is difficult. Gun conditioning and heating the cathode do not cure it. High voltage is stable as radius and timing look OK in TNM but the focus is poor. The Problem does not change with leak nitrogen pressure, and the ICE voltage test passes. Low and unstable mA on an EBT C150 Beam current is low, and fluctuates so that tuning is difficult. Gun conditioning and heating the cathode do not cure it. High voltage is stable as radius and timing look OK in TNM but the focus is poor.The problem does not change with leak nitrogen pressure, and the ICE voltage test passes.
Error message
Beam current is noticeably low when conditioning the electron gun, and running TNM. AFT may fail with with a message: check a water scan.
Applies to
- Product
- EBT C150 EBT C150 EBT C150 Links to the updated Product Service Manuals, FMIs, Service Notes, Option Manuals and Operator Documents can be found online at the attached sites. Always use the most appropriate documentation for your system.
- Component
- 100-09-789 ICE Box assy, Ion Clearing Electrod (electrode). 100-09-789 ICE Box assy, Ion Clearing Electrod (electrode). 100-09-789 ICE Box assy, Ion Clearing Electrod (electrode).
- Area
- CT
Full cause & step-by-step resolution
The complete cause analysis, the step-by-step remedy and the attached service documents for this GE Healthcare CT issue are available to FSELIB subscribers — re-authored, web-first, searchable.
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