Turning On The Power - Boss TU-2 Chromatic Tuner Owner's Manual

Turning on the power

* Always make sure to have the volume level of your amp turned down before switching on power.
Even with the volume all the way down, you may still hear some sound when the power is
switched on, but this is normal, and does not indicate a malfunction.
If you are using an AC adapter
The power will be turned on when you con-
nect the AC adapter to the DC 9V In jack.
When the power is turned on, the meter will light to indicate the current tuning mode. Then
the note name / string number indicator will indicate the first digit of the currently selected
standard pitch.
14
440 Hz
If you are using a battery
The power will be turned on when you insert
a plug into the Input jack.