Yamaha EMX66M Manual Do Utilizador

Troubleshooting

The following table describes the possible malfunctions of this device, and the appropriate actions to be taken in 
each case.

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 indi-
cators of the main section when doing so.

•

If the device is not ventilated sufficiently, refer to 
the cautions given at the beginning of this manual 
and take appropriate measures to insure ade-
quate ventilation.

•

If the load impedance (including a short) is too 
low, refer to the chapter on connections (page 16) 
and change the connections so that the imped-
ance 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 stereo output from the synthesizer has been routed 

to the Super Hi-Z jack of channel 6, but the monitoring 
sound is not stereo.

A: You can use Super Hi-Z (or LINE) 1 and 2 jacks at the 

same time. 
However, they are internally routed into a mono chan-
nel, and therefore the signals from 1 and 2 jacks are 
output as mono signal.

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 

Ω

.