Gibson Guitars 1550-07 GUS - Manual (Page 41)

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Function MCK Position Display LEDs Action Remarks
Intonation Mode
For each green LED
turn the screw half
turn clockwise
For each red LED
turn the screw
half turn counter-
clockwise
Now a colored blink
code displays the
appropriate correction
for the intonation screw.
For example:
= 5 half turns
clockwise
For example:
= 6 half turns counter-
clockwise
Repeat Intonation
Mode for each string.
A correctly intonated
string is indicated by a
blue LED.
I LED shining blue MCK is now in the
position of the string
you are intonating.