Instruction/ maintenance manual of the product HMEC 250 Sennheiser
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HMEC 250 Headset for general aviation Instruction manual.
1 Contents Important safety instructions ..... ...... .............. .............. ............ 2 Delivery includes ....................... .............. .............. .............. ......... 4 The HMEC 250 headset ............ .............. ....
2 Important safety instructions • Please read this instruction manual careful ly and completely before usin g the headset. • Make these this instruction manu al easily accessible to all users at all times. Always include this instruction manual when pa ssing the headset on to third parties.
3 Safety instructions for batteries If abused or misused, batter ies m ay leak and, in extreme cases, may even present an explosion and fire hazard. Sennheiser does not accept any liability for damage arising from abuse or misuse. Keep batteries out of reach of children.
4 Intended use of the headset Intended use includes: • havin g read this instruction manual, especia lly the chapter “Important safety instructions” on page 2, • using the headset withi n the operating conditio ns and limitations de scribed in this instruction manual.
5 The HMEC 250 headset The HMEC 250 headset with Noi seGard 2.0 active noise compensation features closed, dynamic, circumaural stereo headphones. The HMEC 250 is a headset for general aviation use.
6 Additional features • Outstanding tran smission quality for clear communi - cations • Good passive attenuation of ambient noise • Foldable design for space-saving stor age and transpor - tatio.
7 Operating elements Headset Microphone sensitivity contro l Headset c able Microphone boom Ear pads, erg onomic Headband Battery compartment (on both sides) Operating control .
8 LED indications Meanings of the LED : Putting the headset into operation Inserting the batte ries Insert the batteries into the battery compartments on the left and right ea r cups as follows: 왘 Open the battery compartment by pushing the catch and open the cover.
9 Connecting a mobile telephone The 2.5 mm jack socket allows you to connect a mobile telephone. For this purpose, the NoiseGard active noise compensation must be switch ed on and the microphone connector must be connected to the aircraft intercom. A suitable adapter for your mo bile telephone with 2.
10 Connecting an additio nal audio player The 3.5 mm jack socket allows you to connect an additional audi o play er (e.g. MP3 player) . 왘 Connect the audio cable to the 3.5 mm jack socket on the operating control and to the corresponding jack socket on your audio player.
11 Adjusting the mi crop hone sensitivity The microphone sensitivity has been factory preset to 80 mV/Pa. T o change the input sensit ivity of the microphone : 왘 Use a suitable s lotted screwdriver. 왘 T urn the microphone s ensitivity control as shown.
12 Using the headset Attaching the cable clip The cable clip allows you to attach the headset cable to your clothing so that the cabl e doesn’t hinder or distract you. Guide the headset cable through the cable clip as shown. Attach the cable clip to y our clothing.
13 Adjusting the mi crophone boom Bend the microphone boom so th at th e mi c ro pho ne is placed at the c orner of the mouth. Maintain a distance of approx. 2 cm between micr ophone and mouth. Adjusting the volume You can adjust the volume dire ctly on the intercom or via the operating control integ rat ed into the headset cable.
14 Switching the T alkThrough function on/off The HMEC 250 provides excellent attenuatio n of ambient noise. In order to allow yo u to communicate undistur bed with the people around y ou while wearing the head set, the HMEC 250 features a TalkThrough function.
15 Switching No iseGard on/off T o switch the NoiseGard active noise compensation on or off: Press the ON/OFF button for approx. one second. When NoiseGard is switched on: –t h e L E D lights up red and – you can listen to music and make teleph one calls at the same time .
16 Replacing the batteries When the batteries are almost flat, the LED flashes. When the batteries are completely discharged, NoiseGard automatically switches off (fail sa fe operation). Replace the batteries or the rechargeab le batteries as follows: Open the battery compartment by pushing the catch and open the cover.
17 Folding up the headset For space-saving transportation , the headset can be folded up in different ways: T o fold up the headphones as flat as possible: Rotate the ear cups by 90° and turn the microphone boom flat as sho wn. T o fold up the headphones as compac t as possible: Fold the ear cups in as shown.
18 Care and maintenance Use a sof t, slightly damp cloth to clean the headset from time to time. Replacing t he ear pads You can replace the ear pads. Spare ear pads are available as accessories. Grasp the edge of the ear pad and peel it up and away from the ear cup.
19 Attach the ear pad so that the side with the thicker padding points downw ards as shown. Press the new ear pad onto the ear cup until it clicks audibly into place. Repeat for the other ear cup. Replacing the wind shield You can replace the wind shield.
20 Specifications General data W eight without cable and without batteri es approx. 285 g T emperature range (operation ) − 10 to +55°C T emperature range (storage) − 55 to +55°C Power supply for NoiseGard 2 x 1.5 V AAA size battery or 2 x 1.2 V AAA size rechargeable battery Operating time approx.
21 Connector a ssignment Frequency response (headphones) 8–28,000 Hz Frequency response (T alkThrough) 300–5,000 Hz Nominal impedance passi ve 150 Ω mono/300 Ω stereo Nominal impedance active 600 Ω mono/1.
22 Manufacturer declarations Wa rr a n ty Sennheiser electronic GmbH & Co. KG gives a warranty of 36 months on this product. For the current warra nty conditions, please visit ou r website at www.
Sennheiser electronic GmbH & Co. KG Am Labor 1, 30900 W edemark, Germany www.sennheiser.com Printed in China, Publ. 05/10, 516578/A04.
An important point after buying a device Sennheiser HMEC 250 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Sennheiser HMEC 250 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Sennheiser HMEC 250 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Sennheiser HMEC 250 you will learn all the available features of the product, as well as information on its operation. The information that you get Sennheiser HMEC 250 will certainly help you make a decision on the purchase.
If you already are a holder of Sennheiser HMEC 250, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Sennheiser HMEC 250.
However, one of the most important roles played by the user manual is to help in solving problems with Sennheiser HMEC 250. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Sennheiser HMEC 250 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
