BTC Troubleshooting & Repair 3

Question 1

An ECG machine produces a wandering baseline on all leads. Motion artifact has been ruled out. What is the most likely cause?

Accepted Answer

Poor electrode gel contact

Answer

Inadequate electrode-to-skin contact caused by dried or insufficient gel introduces impedance imbalance, producing a wandering baseline.

Question 2

Which safety test measures the current that flows from the device chassis to ground under normal operating conditions?

Accepted Answer

Equipment leakage current test

Answer

The equipment leakage current test measures chassis-to-ground current to ensure it remains within safe limits per IEC/AAMI standards.

Question 3

A portable suction unit motor runs but produces no suction. What should be inspected first?

Accepted Answer

Collection canister lid gasket and tubing connections

Answer

A failed canister gasket or loose tubing connection breaks the vacuum seal, eliminating suction even with a fully functional motor.

Question 4

A blood pressure monitor (NIBP) fails to deflate the cuff after inflation. Which component is most likely faulty?

Accepted Answer

Deflation valve or its control circuit

Answer

The deflation valve controls cuff pressure release; a stuck-closed valve or driver circuit failure prevents deflation.

Question 5

When troubleshooting a medical device, the technician finds a leaking electrolytic capacitor on the power supply board. What is the correct repair action?

Accepted Answer

Replace only the capacitor with an identical-spec part

Answer

A leaking electrolytic capacitor must be replaced with an identical-specification part; resoldering or cleaning does not restore its electrical characteristics.

(BTC) Biomedical Technician Certification Practice Test

(BTC) Biomedical Technician Certification Practice Test

BTC Troubleshooting & Repair 3