Extron Electronics MLA-VC10 - Manual (Page 45)

MLA-VC10 • Configuration and Operation 3-17
Operation
To control audio volume when using a MLA-VC10, turn a
connected MediaLink Controller's Volume knob, or send
commmands through an RS-232 remote control device such as a
computer or third party control device.
Troubleshooting
If the MLA-VC10's LED does not light:
The MLA-VC10 is not receiving power. Check the wiring at the
MLA-VC10's MLC/Power port for the correct polarity. Verify
that the power supply has been connected to a functional power
outlet.
If the MLA-VC10's LED does not blink when volume
commands are sent:
The volume command may be out of the acceptable range (0 to
100 steps).
The MLA-VC10 may not be receiving RS-232 commands
correctly.
If there is no audio output:
Check the wiring at the amplifier/mixer to make sure the
MLA-VC10 is connected to the correct terminals.
Verify that the amplifier/mixer and speakers have been
powered on.
If the output is noisy or has lots of static:
If you are using a TOA 900 series amplifier, follow the
instructions on page 2-14.
For all other amplifiers/mixers, it may be necessary to move
the amplifier/mixer and MLA-VC10 away from sources of
electromagnetic interference, such as appliances and large
motors.
If the voltage control cable is too long, noise may be picked up
from many sources. Use a cable that is no longer than 6 feet
between the MLA-VC10 and the amplifer or mixer.
The ground line may be noisy. Use a different, "clean"
grounding source. The chassis of the MediaLink controller (if
used), the power supply, the MLA-VC10, and the amplifier or