Roland SH-4d Digital Desktop Synthesizer - Manual (Page 83)

Prioritizing the Battery (Battery Fixed Operation Mode)
83
Prioritizing the Battery (Battery Fixed Operation
Mode)
In this mode, the unit does not switch to using bus power, even when a USB power supply is connected to the USB port.
Although the unit does normally switch to bus power when batteries are installed and you connect a power supply to the USB
port, you can make the unit run on batteries only when using battery fixed operation mode, regardless of the bus power supply.
When the power is turned off, the fixed battery operation mode is canceled.
1. While holding down the [ å ] button, turn on the power.
This makes this unit operate on batteries.