Welch Allyn 767 Diagnostic System - User Manual - Manual (Page 7)

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Operating Instructions
Handles will accept any Welch Allyn 3.5v instrument head.
After plugging power cord into outlet, turn power switch to ON position, illuminating
the pilot light.
With power switch in ON position, instruments will automatically light when
handles are lifted from the handle cradle and the OptiSense Optical Sensor is
engaged. Adjust rheostat on handle until desired light output is obtained.
Turning rheostat clockwise increases light output, counterclockwise decreases
light output. Note: Rheostat does not turn instrument completely off. Returning
handle to cradle will disengage
the OptiSense Optical Sensor
and turn the instrument
completely off.
A built-in, automatic voltage
regulator provides maximum
illumination and lamp life.
Instruments will automatically
turn off when the handle is
placed back in the cradle.
The Welch Allyn 767 Wall
Transformer can be turned off by
simply turning the power switch
to the OFF position. Pilot light
alone draws current when
instruments are not in use.
When unit is not in use for more
than a few hours, turn power
switch to OFF position to ensure
longer operating life. Unit can
remain plugged in permanently.
The clock is powered by a battery
and will keep time when power
switch is turned off.
RHEOSTAT