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Yamaha emx212s 8 kanaals powermixer Manual

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Troubleshooting
EMX512SC/EMX312SC/EMX212S
31
Troubleshooting
■
Power doesn’t come on.
❑
Be sure that you are using the supplied power cord, and that it is correctly
connected to the AC IN connector and plugged into a working power out-
let.
■
Power suddenly went off.
❑
Check whether the vents at the sides and rear of the unit are blocked.
The EMX unit may overheat if the vents are blocked. If the unit overheats,
the power may automatically go off. Wait for the unit to cool down, and
then turn the power back on.
■
Sound suddenly
stopped.
❑
Check whether the vents at the sides and rear of the unit are blocked.
The EMX unit may overheat if the vents are blocked. If the unit overheats,
it may cut off the output to the internal amp until things cool down.
■
No sound.
❑
Are microphones, external devices, and speakers connected correctly?
❑
Are the channel LEVEL knobs and the two MASTER knobs set to appro-
priate levels?
❑
Is the POWER AMP switch set correctly?
When outputting a stereo signal, set it to the up (MAIN L/R) position.
❑
Check that the speaker cables are not shorted.
❑
If the above checks do not identify the problem, call Yamaha for service.
(Refer to the end of this manual for a list of Yamaha dealers.)
■
Sound is faint, distorted,
or noisy.
❑
Check that the channel LEVEL knobs and the two MASTER knobs are set
appropriately.
❑
Check that the LINE/MIC switches on channels 1 to 4 are set correctly.
❑
On channels 1 to 4, be sure that you have not connected to both INPUT A
and INPUT B. On each of these channels you may use one input or the
other, but not both.
❑
Is the input signal from the connected device set to an appropriate level?
■
An FCL lamp comes
even though there is no
howling on the channel.
❑
Input of a continuous sound (from a CD player or other such source) may
cause the lamp to come on even in the absence of howling.
■
Can’t hear the internal
digital effect.
❑
Check that the EFFECT knob on each channel is correctly adjusted.
❑
Be sure that the internal effector’s ON switch is turned on.
❑
Be sure that the EFFECT RETURN knobs in the MAIN and MONITOR
sections are correctly adjusted.
■
The sound from the
speakers seems dull.
I want a more forceful
sound.
❑
Try turning on the YS Processing switch.
❑
Adjust the equalizers (HIGH, MID, and LOW knobs) on each channel.
❑
Adjust the graphic equalizers.
■
I want spoken words to
be heard more clearly.
❑
Be sure that the YS Processing switch is turned off.
❑
Adjusting the equalizers (HIGH, MID, and LOW knobs) on each channel.
❑
Adjusting the graphic equalizers.
■
I want to listen to moni-
tor output.
❑
Connected a powered speaker to the MONITOR OUT jack. Then adjust
the MONITOR OUT signal by adjusting the channel MONITOR knobs and
the MONITOR section’s MASTER knob.
❑
If you want to send the monitor signal to SPEAKERS jacks B1 and B2, set
the POWER AMP switch to the down position (to MAIN(L+R) / MON).
Note that in this case the B jacks will output the monitor signal, and the A
jacks will output a mix of the MAIN L and MAIN R signals.
… 31 …


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