Sigtronics Corporation
178 East Arrow Highway
San Dimas, CA 91773
Phone: 909 305-9399
E-mail: [email protected]
Web Site: www.sigtronics.com
igtronics
®
S
…when it counts!
igtronics
®
S
Model SH-40C
Headphone Instructions
The SH-40C series headphones are adjusted at the factory for immedi-
ate use with all current standard radio systems in general aviation aircraft.
SH-40C headphones are equipped with one plug in the standard configura-
tion. The headphone plug is a large diameter plug and should be inserted
into the headphone jack (.250” standard monaural jack).
The headband is adjustable through a full range of motion, or the locking
nuts may be tightened to allow you to custom fit the headphone. Place the
headphone over your head, adjust the slides up until minimum pressure
is felt on the top of your head. The headphone is now properly adjusted.
For maximum noise attenuation, the clamping pressure has been set at the
factory. Releasing the clamping pressure by bending the headband is not
advised, because loss of attenuation will result. Note: If especially small (chil-
dren) or large headbands are needed, they may be ordered from Sigtronics.
When you first connect the headphone, turn the volume control on the
headphone up to the full clockwise position, then adjust the listening
volume with the audio control of either your radio or intercom as appro-
priate. Passengers should also turn their individual headphone volumes up
fully. Doing this allows for a full range of adjustment for each passenger,
since those with the most acute hearing can turn their headphone volume
down, if necessary.
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The headphone parts may be cleaned with mild soap and water using a
soft cloth. Then dry immediately. Caution: Do Not immerse any part of the
headphone in water or any other liquid. Exposure to moisture may cause
internal corrosion and failure and will void your manufacturers warranty.
Cleaning will help the headphone maintain its “like new” condition for
many years.
WARRANTY
Your headphone is covered by a limited three-year parts and labor warranty.
Please see the enclosed warranty card for details.
You may refer to the parts list on the reverse side, if you choose to replace
parts yourself. The parts list describes parts for this particular headphone
only. Parts lists for other models are available on our Web Site or can be
obtained by contacting Sigtronics Corporation
