Sennheiser HMD120 Service Manual

HeadsetHME 100HME 105HME 120HMD 12025Instructions for use

34Adjusting the headbandFor good noise attenuation and best possible comfort, the headband has to be adjustedto properly fit your head:씰 Wear the head

35Positioning the microphoneRelocating the microphone boomThe microphone boom can be worn on either side of the mouth.씰 Loosen the quick-fixing device

36For positioning the microphone of the HMD 120 headset, proceed as follows:씰 Adjust the length of the microphone boom so that the microphone is place

37Using the headsetsMono/Stereo selection (HME 100 only)In general, you‘ll receive a mono sound source so that the Mono/Stereo switch can remainset to

38Mic Gain AdjustmentAdjusting the microphone gainAccording to JTSO approval C58a, the microphone output voltage is factory-preset to400 mV. If the mi

39Additional information for helicopter use of the HME 120 headsetThe polarity of the microphone connection in helicopters is not standardized. If the

40Spare partsThe following spare parts are available from your Sennheiser agent:• Wind screen for MKE 45-1 electret microphone• Cable clip• Carry and

4131 2231123 44213solder side5U174/U jack plug1 Microphone Lo2 Audio Hi3 Microphone Hi4 Audio LoPJ-068 jack plug1 Not assigned!2 Microphone Hi3 Microp

42In case of difficultyIf problems occur that are not listed in the below table, please contact your Sennheiseragent.Possible cause and what to doYou

43Possible cause and what to doRe-adjust the output voltage on the microphone.씰 To do so, use a small slotted screwdriver and turn the ‘Mic Gain Adjus

26ContentsSafety tips ...27Headset features ...

44Technical dataHME 100 HME 105 and HME 120 HMD 120HeadphonesTransducer principle dynamicEar coupling circumaural, closedFrequency response 45–15,00

45HME 100 HME 105 HME 120 HMD 120Supply voltage typ. 16 V DC typ. 16 V DC typ. 16 V DC –(8–16 V DC, (8–16 V DC, (8–16 V DC, approx. 8–25 mA 

46Certificate of ConformitySennheiser electronic GmbH & Co. KG declare that this device conforms to the applicable CE standards and regulations.Fo

136Sennheiser electronic GmbH & Co. KG Telefon 05130/600-0D-30900 Wedemark Telefax 05130/600-300Printed in Germany Publ. 01/03 8356

27The HME 100, HME 105, HME 120 and HMD 120 are pilot headsets with closed earprotector headphones for use in helicopters, propeller and turboprop air

28Headset featuresHME 100 headset• New passive headset with excellent noise attenuation• Excellent comfort due to very low weight, soft ear cushions a

29Product variantsHME 105 headsetThe HME 105 differs from the HME 100 in the following features:• No Mono/Stereo switch• Connection of headphones and

30HMD 120 headsetThe HMD 120 differs from the HME 100 in the following features:• No Mono/Stereo switch• Coiled cable• M-87/AIC dynamic microphone and

31Delivery includesHME 100, HME 105 and HME 120 headsets• Headset• Padded carry and storage bag with shoulder strap for headset and accessories• Wind

32Preparing the headsets for useConnecting the headsetsHME 100 headset:11/4” (6.35 mm) stereo jack plug for connecting the headphones1 PJ-068 jack plu

33Connecting cable forHME 120 and HMD 120HME 120 and HMD 120 headsets:1 U-174/U jack plug for connecting the headphones and the microphone씰 Connect th