AEC206 Reference Manual
Ear Simulator and Preamplifier
2-4
2.3.2 Removing Ear Simulator and Preamplifier
The AEC304 will already be assembled in the head of the AEC206 test
fixture. Larson Davis recommends that the entire system be shipped for
factory calibration, however, the following procedures describe removing
the ear simulator and preamplifier to ship to Larson Davis separately. It is
important to reassemble using the steps below exactly in order to
maintain acoustic quality, see 2.3.3 "Assembling AEC304" on page 2-7.
To remove the AEC304 follow these steps:
Step 1
Disconnect the preamplifier cable from the analyzer.
Step 2
Using the supplied 2.5 mm hex driver, remove the set screws
on the head by turning the recessed set screw
counterclockwise. Ensure you store the screws as they are
imperative to the acoustical quality of the device.
FIGURE 2-4
Remove head set screws
Step 3
To release the vacuum like seal inside the head, allowing for
easy removal of the head, you can loosen one AEC304 and
set it out slightly, though this is not necessary. DO NOT pull
cable slack; only remove <1 inch of cable.
Alternatively, to assist in removal, you can attach the
calibrator and pull horizontally. Extreme force is not
necessary and may result in damaging the equipment.
Step 4
Using the supplied 2.5 mm hex driver, release the clamp on
the neck by turning the neck screws counterclockwise until
two or three threads are visible.
FIGURE 2-5
Loosen neck set screws
Use the hex
driver to
remove set
screws
Neck
screw
locations
