Power Supply; Using Batteries - Yamaha QY20 Owner's Manual

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Setting Up: Power & Connections

Power Supply

Your QY20 will run either from batteries or an optional AC adaptor. Follow the instructions
below according to the power source you intend to use.
Using Batteries ——————————————————————————
Z
Open Battery
Compartment Cover
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Six 1.5V AA size (SUM-3 or R6P) or equivalent alkaline batteries
must first be installed in the battery compartment.
Open the battery compartment cover — located on the instrument's
bottom panel — by pressing down on the grooved section of the cover
and sliding in the direction of the arrow, as shown in the illustration.