Yamaha EMX68s - Manual (Page 28)

26
Troubleshooting
EMX88S/EMX68S—Owner’s Manual
Troubleshooting
The following table describes the possible malfunctions of this device, and the appropriate actions to be taken in
each case.
Powered Mixer Q&A
Problem Cause Action
Sound is no
longer out-
put from the
speakers.
The POWER
indicator is lit.
The load on the amplifier of this device
was too great, and the protection cir-
cuit for the amplifier has operated.
Possible reasons for the excessive load
are an excessive level setting in the
channel control section or main section,
insufficient ventilation, or insufficient
load impedance of the connected speak-
ers.
Please wait. When the device cools off, normal
operation will resume automatically. However,
please check the following three points to prevent
the problem from recurring.
• If the level setting is excessive, lower it to the
nominal level. You can refer to the peak level
indicators of the main section when doing so.
• If the device is not ventilated sufficiently, refer to
the cautions given at the beginning of this man-
ual and take appropriate measures to insure
adequate ventilation.
• If the load impedance (including a short) is too
low, refer to the chapter on connections (page
15) and change the connections so that the
impedance is correct.
Other
Connections between devices have
come loose. Inspect the connections, and correct any faulty con-
nections.
Other
The device may have malfunctioned. Please con-
tact your dealer.
Q: The built-in effect is not effective. A: The ON switch in the DIGITAL EFFECT section may
not be turned on. Or, you have adjusted the EFFECT
control in the Channel section or the EFFECT RTN
control in the MAIN section.
Q: The monitoring sound from the speakers is not power-
ful enough relative to the level of the input sound.
A: The equalizer LOW control for each channel may be set
to negative values.
Q: The signal is sent from the EFFECT OUT jack to the
connected effect processor. Then the effect sound is
returned to the AUX IN jack. However, no signal is input
to the mixer.
A: The AUX IN control in the MAIN section may not be
rotated to right.
Q: An external powered speaker is connected to the MON-
ITOR-OUTPUT jack.
However, the signal is not sent to the speaker even
when the MASTER control in the MONITOR section is
turned.
A: The MONITOR controls for input channels may not
have been adjusted.
Q: Can the Low-Z jack and the Hi-Z jack be used at the
same time?
A: You cannot use the Low-Z jack and the Hi-Z jack for the
same channel at the same time.
Q: Can a single speaker be connected to the mixer? A: Yes. Use a speaker with an impedance of 4-8 ohms.