Sennheiser HE 1 Instruction manual HE 1 - Page 30

It might be that the operating elements retract to the off position.

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Page 30 highlights

Using the HE 1 | Switching the tube headphone amplifier on Deactivating the blockage protection If, during initialization, the operating elements and the amplifier 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 flashes 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 amplifier 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). 28

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28
Using the HE 1
|
Switching the tube headphone amplifier on
Deactivating the blockage protection
If, during initialization, the operating elements and the amplifier 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 flashes 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 amplifier 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).