Sennheiser HE 1 - Page 30

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Using the HE 1 | Switching the tube headphone amplier on
Deactivating the blockage protection
If, during initialization, the operating elements and the amplier tubes cannot
extend automatically because they are blocked or if the glass cover cannot
open because it is blocked, the blockage protection will be activated. The
status LED ashes red. In this case, the HE 1 cannot be used.
To deactivate the blockage protection of the HE 1:
▷ Set the power switch to OFF to switch the HE 1 off and wait until the status
LED goes off (up to 30 seconds).
▷ Make sure that the operating elements, the amplier tubes and the glass
cover are not blocked.
▷ Set the power switch to ON to switch the HE 1 on again.
It might be that the operating elements retract to the “off” position.
▷ Press the on/off button.
The HE 1 switches on normally (see previous page).