48
If a problem occurs ...
If a problem occurs ...
Problem Possible cause Corrective action Page
The headphones cannot be
switched on
No connection to the power
supply system.
Check if the HE 1 is connected to the
power supply system and if the power
switch is set to ON.
26
The power fuse has blown. Contact your Sennheiser partner. –
No audio signal The HE 1 is switched off. Switch the HE 1 on. 27
The volume is adjusted to low. Increase the volume. 37
The mute function (MUTE) is
activated.
Deactivate the mute function. 38
The INPUT rotary switch is set to a
different audio source.
Set the INPUT rotary switch to the
desired audio source.
32
No audio signal when a digital
audio source is connected
The data format of the digital
audio source is not PCM.
Set the audio source to PCM data
format.
16
The audio signal is very low or
distorted when an analog audio
source is connected
The volume of the audio signal on
the audio source is adjusted too
low or too high.
If possible, adjust the volume of the
audio signal on the audio source to a
medium level.
–
The signal level of the INPUT
audio input is adjusted too low/
too high.
Increase or reduce the signal level of the
INPUT audio input.
33
Cracking noise occurs when the
headphones are put on
This is no malfunction – the
cracking noise occurs due to a
temporary overpressure in the ear
cups.
Pressure compensation is performed
automatically within approx. 2 seconds.
The headphones are then fully
operational.
–
Audio signal only on one ear The analog audio cable is not
properly connected.
Properly connect the audio cable to the
playback device.
15
One tube is defective. Replace the tubes or contact your
Sennheiser partner.
42
The PC does not recognize the
HE 1 as the audio output device
No driver is installed. Install the USB Audio driver. 20
No audio signal when the HE 1
is connected to a PC via USB
Another audio output device is
selected.
Select “Sennheiser HE 1” as the audio
output device.
18
No driver is installed. Install the USB Audio driver. 20
Sound dropouts when con-
nected via USB
The USB cable is not sufficiently
shielded.
Use a USB cable that is at least USB 2.0
certified.
16
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