IHS Troubleshooting Hearing Instruments 3 — Questions and Answers
Question 1: A patient with a CIC hearing aid reports that sounds are muffled and the occlusion effect is severe. Which adjustment would most directly reduce the occlusion effect?
- Reduce high-frequency gain
- Open the vent or increase vent diameter (Correct answer)
- Switch from omnidirectional to directional mode
- Increase compression ratio
Correct answer: Open the vent or increase vent diameter
Enlarging the vent allows low-frequency energy produced by the patient's own voice to escape the ear canal, reducing the barrel or occlusion effect.
Question 2: A hearing aid suddenly stops working. The hearing care professional inserts a fresh battery and still gets no response on the listening stethoscope. What is the next step?
- Increase the master gain
- Check battery orientation and that the battery door fully closes (Correct answer)
- Reprogram via Bluetooth
- Replace the microphone screen
Correct answer: Check battery orientation and that the battery door fully closes
Even with a new battery, incorrect orientation or an incompletely closed battery door prevents current flow and will render the aid non-functional.
Question 3: Which of the following best describes the purpose of the 'stethoscope clip' or hearing aid stethoscope during troubleshooting?
- It measures the real-ear gain of the hearing aid
- It allows the clinician to listen to the hearing aid's output directly (Correct answer)
- It tests the telecoil sensitivity
- It measures harmonic distortion
Correct answer: It allows the clinician to listen to the hearing aid's output directly
A hearing aid stethoscope couples the hearing aid output to the clinician's ears so the clinician can assess sound quality, feedback, and output level.
Question 4: A patient reports their hearing aid whistles constantly even without anything near the ear. After confirming the earmold fits well, what should be assessed next?
- Check for a crack or hole in the earmold or tubing (Correct answer)
- Increase the attack time
- Lower the telecoil sensitivity
- Reduce the compression kneepoint
Correct answer: Check for a crack or hole in the earmold or tubing
A crack or hole in the earmold shell, tubing, or canal portion can create a sound leak that causes constant acoustic feedback independent of proximity to surfaces.
Question 5: A digital hearing aid is programmed but the patient reports the aid sounds identical regardless of the environment. Which feature is most likely malfunctioning?
- Automatic environment classification or scene detection (Correct answer)
- Volume control potentiometer
- Receiver output
- Battery voltage regulation
Correct answer: Automatic environment classification or scene detection
Modern hearing aids use automatic scene detection to switch programs; if that system fails, the aid defaults to one setting regardless of the acoustic environment.
Question 6: A patient reports that their hearing aid is louder in one program than another but both programs were set identically. What is the most likely explanation?
- The battery is dying
- One program has a different microphone mode or frequency response saved (Correct answer)
- The volume wheel is faulty
- The receiver is clogged
Correct answer: One program has a different microphone mode or frequency response saved
Even if overall gain targets appear the same, programs can differ in microphone polar pattern, frequency shaping, or noise reduction, resulting in perceived volume differences.
Question 7: Which hearing aid component failure would cause the aid to work normally in quiet but cut out specifically in loud environments?
- Weak battery unable to power the output stage at high drive levels (Correct answer)
- Defective microphone screen
- Blocked vent
- Loose volume control
Correct answer: Weak battery unable to power the output stage at high drive levels
A battery with insufficient current capacity can power the aid in quiet but fail to sustain the higher current draw needed during loud sounds, causing intermittent cutouts.
IHS Troubleshooting Hearing Instruments 3
A patient with a CIC hearing aid reports that sounds are muffled and the occlusion effect is severe.
Which adjustment would most directly reduce the occlusion effect?