Sennheiser HE 1 Instruction manual HE 1 - Page 52
touch the transducers and that the cables are in perfect condition., LED goes off up to 30 seconds.
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If a problem occurs ... High-voltage protection In order to best protect you, the high voltage of the electrostatic headphones and tube headphone amplifier is permanently monitored at the transducers, cables and connections. If irregular values are observed, the high-voltage protection is activated immediately and the voltage is cut off. The status LED flashes red quickly two times. In this case, the HE 1 cannot be used. Should the high-voltage protection be activated, proceed as follows to deactivate it: ▷▷ 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 there is no moisture on or in the product, that no objects touch the transducers and that the cables are in perfect condition. ▷▷ 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. If the high-voltage protection is still activated, please contact your Sennheiser partner (see "Contact" on page 4). 50