Clear-Com RS-602 (No longer available) - Manual (Page 19)

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R S - 6 0 2 / 6 2 2 B E L T P A C K
Turn the screwdriver until you can no longer hear any
sidetone in the headset. This is called the “null” setting.
When you turn the screwdriver again, either clockwise
or counterclockwise, the sidetone increases. Adjust the
sidetone so that it is somewhere in the mid-range of
possible settings, at a level that feels comfortable to you.
The need for an extreme sidetone setting to either limit
could indicate a problem with the overall intercom
system, such as lack of terminations or multiple
terminations. A malfunctioning headset could also be
the cause.
Note: The small raised dots next to the sidetone controls
help you to identify the correct control in darkened
environments. The channel A control has one raised dot
adjacent to it. The channel B control has two raised dots
adjacent to it.
Do not force the sidetone adjustment control past its stop
points as this will damage it.