Sennheiser HD400 manual Connecting the headset to the on-board system, Danger of short circuit

Power supply for

NoiseGard™

Ground

Do not connect!

XLR-3 socket for HMEC 300, HMEC 305-C, HMEC 322, HMEC 400 and HMDC 322 headsets

1. Connecting the headset to the on-board system

The NoiseGard™ electronics can be connected to on-board power supply systems with operating voltages between 12–35 V DC.

Danger of short circuit!

Before turning on NoiseGard™, ensure that the on-board power supply system is protected by a 1 A fuse.

The HMEC 300, HMEC 305-C, HMEC 322, HMEC 400 and HMDC 322 headsets are supplied with an XLR-3 socket for panel mounting in the aircraft. The XLR-3 socket must be mounted by a technician qualified to perform this type of installation.

HMEC 300 and HMEC 400 headsets:

￿Connect the 1/4” (6.35 mm) stereo jack plug for the headphones and the PJ-068 jack plug for the microphone to the corresponding jack sockets of your intercom.

￿Connect the XLR-3 plug to the XLR-3 socket.

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