Gibson Guitars 1550-07 GUS - Manual (Page 39)

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Now you are ready to engage String Up Mode. MCK should be on the green revolving arrow
as described on the previous page. After the display is pressed for 3 seconds, all strings will
wind themselves close to their correct pitches, whereupon you must fine tune your guitar
using Normal Tuning Mode. (When all strings are removed, don’t allow the tailpiece to move or
it could damage its connector!)
TO ACTIVATE STRING UP MODE FOR A SINGLE STRING
(as in the case of replacing a string broken while playing)
Install the string in the manner described above (remember saddle contact is crucial!).
Simply select the LED for the string you are replacing, turn to the green revolving arrow and
toggle it from green to red and back to green. Press the display for three seconds.
The Robot Tuners
TM of the selected string will begin winding close to normal tuning, and when
it stops, you will be ready to fine tune it using Normal Tuning Mode.