Hyundai IT H-CMD7075 - Manual (Page 12)

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General operations
Reset the unit
Operating the unit for the first time or after replacing the car battery, you must reset the unit.
Press OPEN button and remove the panel, then press the RESET button to restore the unit to the original factory settings.
Power button
Press any button to turn the unit on.
Press the POWER button to switch the unit off.
Note: After the unit is off, the clock, volume level and radio current settings will be memorized, and when you turn the unit on it will
resume the stored status you set.
Volume adjustment
Rotate VOL knob on the panel clockwise or press the VOL+ button on the RC to increase the volume level; rotate anticlockwise or
press VOL- to decrease the volume level.
Mute function
Press the MUTE button to cancel the sound. Press again to resume.
Mode selecting
Press the MOD button (TUN knob) on the front panel or MODE button on RC repeatedly to select the mode: RADIO => DISC (the
type of disc inserted) => USB (if any is inserted) => CARD (the type of card inserted).
Subwoofer control
Press and hold the BAND/ NP/ SUB button on the panel to turn the Subwoofer output ON. An external amplifier is required to
operate a subwoofer.