BPM F-15 Assembly Instructions & Owner's Manual page 32

3.3 Button Definition
SW-LCD is equipped with special 30-button unit. This
operating button is suit for both L/R hand, button instruction
figures as follows:
30-button unit is connected to the bottom of the SW-LCD
display via lead cable.
In the following introduction, is named as
"MODE". is named as "UP" and is
named as "DOWN".
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