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Alcorn McBride MP3 Audio Machine User’s Manual • Rev H • April 2, 2004
Status LED
A dual-color LED located on the front of the unit indicates status.
LED
Behavior
LED Meaning
Steady green
Drive access or serial communication activity.
Steady orange
Paused or Waiting.
Flashing red
Fault.
Flashing green
Copying or power-on self test.
Off
Idle.
The LED flashes green during power-up initialization, then glows steadily while
initializing the media. Do not attempt to communicate with the unit until the LED
goes out.
Voltage / Contact Closure Select Switch
A 4 key DIP switch (red with white keys) is located on the side of the unit next to the
DB-37 Control Connector. Its first key selects between voltage inputs or contact
closures for the discrete controls. More information on these inputs may be found in
the section entitled Rear Panel Connectors. For contact closure mode, push the DIP
switch #1 to “ON”.
Ground Lift
Be sure to configure the
MP3 Audio Machine’s
switches before rack
mounting the units, or
the switches may be
inaccessible.
In the event of AC hum or noise, the second key on the 4 key DIP switch, located at the rear
of the left side of the MP3 Audio Machine, may be opened to isolate the MP3 Audio
Machine’s ground from its chassis. For ground lifting, push the DIP switch #2 to OFF.
