User manual SENNHEISER HMD 25-1

[. . . ] 15 Replacing the wind screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Replacing the ear cushions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Connector assignment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 In case of difficulty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] Set the volume to safe levels that do not interfere with your ability to hear informational sounds and warning alarms. Do not attempt to repair the headset yourself. If problems occur, contact your Sennheiser agent for assistance. Only replace parts of the headset whose replacement is described in this manual. All other parts of the headset must be replaced by your Sennheiser agent. For information on how to clean the headset, contact your Sennheiser agent. 4 Headset features HME 100 headset New passive headset with excellent noise attenuation Excellent comfort due to very low weight, soft ear cushions STANDARD and padded headband as well as best possible freedom of movement due to unilateral connecting cable Foldable headband for easy and space-saving storage Clear communications due to MKE 45-1 electret microphone with adjustable sensitivity (sensitivity adjustment must be carried out by authorized personnel) Microphone can be easily positioned and worn on either left or right side due to flexible microphone boom with quick-fixing device Optimum radio reception due to headphone systems with wide frequency response Integrated volume control Adaption to the aircraft intercom system via Mono/Stereo switch JTSO approval Made in Germany, five-year warranty Personalization of the headset Name: 5 Product variants HME 105 headset The HME 105 differs from the HME 100 in the following features: No Mono/Stereo switch Connection of headphones and microphone via XLR-5 plug Headset HME 110 The HME 110 differs from the HME 100 in the following features: black caps soft earpads LUXURY headband with soft headcushion HME 120 headset The HME 120 differs from the HME 100 in the following features: No Mono/Stereo switch Coiled cable Connection of headphones and microphone via U-174/U jack plug to a high impedance interface in the helicopter 6 HMD 25-1 headset The HMD 25-1 differs from the HME 100 in the following features: No Mono/Stereo switch Coiled cable M-87/AIC dynamic microphone and low impedance headphones Connection of headphones and microphone via U-174/U jack plug to a low impedance interface in the helicopter 7 Delivery includes HME 100, HME 105, HME 110 and HME 120 headsets Headset Padded carry and storage bag for headset and accessories Wind screen for microphone Cable clip HMD 25-1 headset Headset Padded carry and storage bag for headset and accessories Cable clip Recommended Accessories Replaceable gel ear cushions GOP 8 Preparing the headsets for use Connecting the headsets HME 100, HME 110 headset 1 1/4" (6. 35 mm) stereo jack plug for connecting the headphones 1 PJ-068 jack plug for connecting the microphone Connecting cable for HME 100, HME 110 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. HME 105 headset 1 XLR-5 plug for connecting the headphones and the microphone Connect the XLR-5 plug for the headphones and the microphone to the XLR-5 socket of your intercom. Connecting cable for HME 105 9 HME 120 and HMD 25-1 headsets 1 U-174/U jack plug for connecting the headphones and the microphone Connect the U-174/U jack plug for the headphones and the microphone to the U-174/U socket of your intercom. Connecting cable for HME 120 and HMD 25-1 Adjusting the headband For good noise attenuation and best possible comfort, the headband has to be adjusted to properly fit your head: Wear the headset so that the headband runs over the top of your head. Adjust the length of the headband so that your ears are completely inside the ear cushions, you feel even, gentle pressure around your ears, a snug fit is ensured. Note: Make sure not to squeeze any connecting cable when adjusting the headband. Squeezing can damage the connecting cables. Final adjustment is best made in a noisy environment. 10 Positioning the microphone Relocating the microphone boom The microphone boom can be worn on either side of the mouth. Problem Communications in one ear only (HME 100, HME 110) Possible cause and what to do You are using a stereo intercom system but the headset is set to mono operation. Set the Mono/Stereo switch to `Stereo'. You are receiving a mono source but the headset is set to stereo operation. Set the Mono/Stereo switch to `Mono'. Very low volume communication The volume control is set too low. Check the volume setting of the headset. The headphone connection has been pulled out. Check to see if the headphone jack plug is correctly connected. Reduced intelligibility The microphone connection has been pulled out. Check to see if the microphone jack plug is correctly connected. Microphone output voltage too high or Re-adjust the output voltage on the microphone. [. . . ] 10 N HMD 25-1 dynamic circumaural, closed 45 ­ 15, 000 Hz 16 , mono > 10 ­ 40 dB approx. preamplifier (not HMD 25-1) HME 100, HME 110 Transducer principle electret mic capsule, noise-compensated MKE 45-1 300 ­ 5, 000 Hz 120 dB 150 HME 105 electret mic capsule, noise-compensated MKE 45-1 300 ­ 5, 000 Hz 120 dB 150 HME 120 electret mic capsule, noise-compensated MKE 45-1 300 ­ 5, 000 Hz 120 dB 150 HMD 25-1 dynamic, M-87/AIC 500 ­ 4, 000 Hz 1, 8 ­ 4 V/74 dB at 5 - Frequency response Sensitivity Max. terminating impedance 18 HME 100, HME 110 Output voltage 400 mV ± 3dB at 114 dB (nach RTCA/DO 214) typ. 8­25 mA as per RTCA/DO 214) HME 105 400 mV ± 3dB at 114 dB (nach RTCA/DO 214) typ. [. . . ]