Troubleshooting
When No Sound Is Output
Refer to this section when no sound is output or the volume is very low. This information is for when sound is output from the
[STEREO OUT] jacks or the [PHONES] jack.
For details about these functions, see “Controls and Functions” on pages 12 – 16.
STEP 1 Connections and Signal Flow
Check if the instruments, microphones, and speakers are connected correctly, and if any of the cables are damaged.
When connecting guitars or basses to the MG, use
DI boxes.
DI
1
Signal is input from a microphone or instrument.
2
Adjust tone and level for each channel.
3 Route signals from channels to the master block.
[STEREO OUT] jacks
5
The signal is output to speakers and/or headphones.
[PHONES] jack
4
Make final adjustments to the level of the signal.
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Troubleshooting
STEP 2 Setting Switches and Controls
Check the overall balance
Use the settings shown in the illustration to check the overall balance from speakers or headphones.
[PHANTOM +48V] switch
Turn this switch on (the indicator lit) when using a condenser microphone.
• To prevent an unwanted burst of noise from the speakers, turn off powered speakers (or power amps) before turning on the [PHANTOM +48V] switch.
[GAIN] knobs
Turn until the [PEAK] indicator begins to flash intermittently.
Level meter
If the level meter [PEAK] indicator flashes frequently, lower the
[LEVEL] knobs for each channel.
[PEAK] indicators
[MONITOR/PHONES] knob
For adjusting the headphone level and the MONITOR level.
[LEVEL] knobs
For adjusting the level for each channel.
[STEREO LEVEL] knob
For adjusting the overall volume, with “” as the nominal level.
MG12XUK Owner’s Manual 19
Troubleshooting
Other
The power does not come on.
No sound is output.
The sound is low, distorted, or noisy.
Effects are not applied.
Speaking voices are not clear.
No mixer monitor signal is output.
Left and right levels are different for a stereo signal input.
The sound level is unstable and inconsistent.
The volume of audio play-back from a computer need to be adjusted.
Is the mixer connected to an independent power source (generator, etc.) or a power strip with switches?
Check that the power of that device is turned on.
Are external instruments (including microphones) and speakers connected correctly?
Are your cables shorted?
Are the [GAIN] knobs for each channel, [LEVEL] knobs, [STEREO LEVEL] knob adjusted to appropriate levels?
Are the[LINE /USB ] switch set appropriately?
Is the microphone connected to a [MIC/LINE] jack?
When using a condenser microphone, is the [PHANTOM +48V] switch turned on?
Is the [PAD] switch on?
Turn this switch off for sources with low output levels, such as microphones.
Is the output signal level for the instrument connected to the mixer appropriate?
When connecting an instrument with an output level of +4 dBu, either turn on the [PAD] switch on a mono input channel or use a stereo input channel.
Where an input channel provides both a XLR input jack and a phone input jack, or a phone input jack and an RCA pin jack, are there connections made at both jacks?
Use only one of these jacks.
Are the [GAIN] knobs for each channel, [LEVEL] knobs, [STEREO LEVEL] knob adjusted to appropriate levels?
Are effect or compressor levels too high?
Use the [FX] knobs, [FX RTN LEVEL] knob, and [COMP] knobs to lower their levels.
Are the [FX] knobs for each channel adjusted to appropriate levels?
Is the [FX ON] button for [FX RTN] turned on?
Are the [PARAMETER] knob and [FX RTN LEVEL] knob adjusted to appropriate levels?
Is the [HPF] switch turned on?
Is the equalizer ([HIGH]/[MID]/[LOW]) adjusted appropriately?
Are powered speakers connected to the [MONITOR OUT] jacks?
Use the [MONITOR/PHONES] knob to adjust the signal output from the [MONITOR OUT] jacks.
Is [PAN] set to the center?
If panned to the center, try reversing the left and right input connections. If, after switching the left and right connections, the side with the low volume level also switches, check the instrument or device that is the source of the signal.
Are you using the same type of cable to connect both the left and right input signals?
Cables with built-in resistors will attenuate the signal.
Is the compressor level set too high?
Use the [COMP] knob to lower the level.
Use the “Attenuator Function”. For details, see page 16.
If any specific problem should persist, please contact your Yamaha dealer.
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