TU-15: Calibrating the Tuner Needle
The following procedure can be used to calibrate the tuning needle:
1. While holding the PITCH button, switch on the power.
2. Confirm that the tuner's needle is pointing to "0". If the needle is pointed to "0," no adjustments are needed. If the needle is not pointing to "0," continue to step 3.
3. Continue to hold PITCH and use a small flathead screwdriver to adjust the needle from the underside of the tuner. ( Insert the screwdriver into the small hole just below "SER.NO." )
4. When the needle is pointing directly to "0", release PITCH. The calibration is complete.