Troubleshooting - Boss Metal Core ML-2 Owner's Manual

Troubleshooting

The power won't come on /
the CHECK indicator doesn't light
● Is the specified adaptor (PSA-series, sold
separately) properly connected?
Check the AC adaptor connection (p. 7, 8).
* Never use any AC adapter other than one
specified for use with the ML-2.
● Is the battery low or dead?
Replace it with a new battery (p. 11).
* The battery that is supplied with the unit is for
temporary use, intended primarily for testing
the pedal's operation.
* The use of an AC adaptor is recommended as the
unit's power consumption is relatively high.
Should you prefer to use a battery, please use the
alkaline type.
* To prevent unnecessary battery consumption, be
sure to disconnect the plug from the INPUT jack
when not using the effects unit (p. 5).
● Is your guitar properly connected to the IN-
PUT jack?
Check the connection once more (p. 7, 8).
12
* A cable must be connected to the INPUT jack to
allow the effect to be turned on.
* If a cable is connected but no power is supplied
to the unit (either from a battery or an AC
adaptor), the CHECK indicator will not light
when you try to turn the effect on.
No sound / low volume
● Is your instrument properly connected to
the ML-2?
Check the connection once more (p. 7, 8).
● Is the LEVEL knob set too low?
The further counterclockwise you turn the
LEVEL knob, the more the volume is re-
duced when the effect is on. Turn the LEVEL
knob clockwise to increase the volume.
● Is the volume turned down on any guitar
amp or effects device you have connected?
Check the settings of the connected device.
● Is the battery low or dead?
Replace it with a new battery (p. 11).