MODEL 51240B/53540B/53640B/61240B/63540B/63640B
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2. Basic Setting & Usage
2.1. The Function of PC Board
A. Time of day indicator
Lights on，display the time of day.
B. Button lock indicator
Lights on, indicate the buttons are locked. At this moment, press any
single button will not work (No operation in one minute, will light on
and lock the buttons.)
Solution：Press and hold both and for 5 seconds until the lights
off.
C. Program mode indicator
Lights on，enter program display mode. Use or to view all
values.
Flashes, enter program set mode. Press or to adjust values.
D. Manu/Confirm button
Press , lights on, enter program display mode and use or to
view all values.
In program display mode, press , flashes, enter program set mode,
press or and adjust values.
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