Microphone maintenance. The maintenance of microphones is-not so much in the microphone-
itself but rather in the cords and connectors. If, for instance, you were told a carbon microphone did not
have an adequate output, the first thing you should check is the carbon granules for a "packed"
condition. This condition is caused by excessive current which causes the carbon granules to stick.
Carbon granules that are packed can sometimes be loosened if you turn off the applied current and shake
the microphone while holding it in various positions. If this does not correct the situation, you may have
to replace the carbon granule mass. Do not shake a dynamic microphone, as this will not accomplish
anything desirable and may damage the internal unit.