Cochlear Nucleus 7 Hybrid Mode, Professionals Manual

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20
NUCLEUS® 7 HYBRID MODE PROFESSIONALS GUIDE
PROBLEM POSSIBLE CAUSE TEST / RESOLUTION
High distortion Wax is blocking a
filter 1. Replace the dome (with its built-in wax filter).
2. Check the wax filter on the speaker unit and
replace if necessary.
Educate the recipient to do this regularly.
Hybrid receiver is
broken Check the Hybrid receiver using a listening test, and
replace it if required.
If the test is not conclusive, reproduce the ‘Total
harmonic distortion’ measurement described in the
Data Sheet supplied with this guide and check
against the outlined limits.
Occlusion
(‘Head in a
bucket’
sensation) The dome vent is
blocked Check the vent for obstruction. Replace the dome if
necessary.
Dome vent is too
small Pull the speaker unit slightly out of the ear. If this
makes the sound quality improve, change to a dome
with a larger vent size.
Dome fit is too tight Change to a smaller dome.
Intermittent
contact,
crackling sound Wax or moisture 1. Wipe the system dry.
2. Replace the dome (with its built-in wax filter).
3. Check the wax filter on the speaker unit and
replace if necessary.
Educate the recipient to do this regularly.
Loose connection
point at the earhook Perform a listening test using a Stetoclip while
carefully moving all parts of the Hybrid system in
turn. Replace the Hybrid receiver if necessary.
Sound processor
fault Perform a listening test using a Stetoclip. If this
shows a problem, send the sound processor for
repair.