What is a common fault associated with therapeutic medical equipment?

Power supply and battery issues are a common fault associated with therapeutic medical equipment due to the critical role these components play in the functioning of such devices. Many therapeutic devices, including infusion pumps and monitors, rely heavily on stable power sources to operate correctly. When the power supply or batteries fail or become unstable, it can lead to device malfunctions, inaccuracies in treatment delivery, or complete shutdowns. Diagnosing and resolving these issues is essential for ensuring that the equipment continues to provide effective patient care.

The other options relate to symptoms that could be observed in devices, such as display issues, physical alterations, or noise, but they do not encompass the more systemic and severe problems posed by power supply and battery failures. Power-related issues can compromise the entire operation of the device, making them a critical area of focus in biomedical equipment maintenance and troubleshooting.