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CHAPTER 2: MPS-482HP FRONT AND REAR PANELS
MPS-482HP FRONT PANEL
The MPS-482HP front panel includes a power switch and
LEDs for monitoring each loudspeaker channel.
MPS-482HP Power Supply Front Panel
AC Power
The MPS-482HP is powered on and off with the AC Power
switch.
Fuse, Voltage, and Load Current LEDs (1–2)
The Fuse, Voltage and Load Current LEDs are useful for
verifying if a channel fuse is open/blown, whether each
channel output has voltage, and whether the connected
loudspeakers are receiving DC power and audio.
MPS-482HP Channel LEDs
Red Fuse LEDs (1-2)
A lit red LED indicates a blown or open fuse on that channel.
If the Red LED is lit, power down the MPS-482HP and
replace the fuse for that channel.
TIP:
To replace a fuse, use a screwdriver to
gently turn the appropriate fuse cover
(open: counterclockwise; close: clockwise).
Fuse Access
Blue Voltage LEDs (1–2)
The blue Voltage LEDs indicate whether voltage is present
for the channel outputs. These LEDs should be lit when the
MPS-482HP is powered on. The MPS-482HP's intelligent
circuit protection shields connected loudspeakers from
surges and shorts. When a blue Voltage LED is unlit and its
corresponding green Load Current LED is off, a surge or
short has been detected for the channel. If a surge or short
is encountered, or the Red LED is lit, power down the
MPS-482HP, inspect the loudspeaker cabling, and replace
the fuse for that channel.
Table 1 lists the possible states for the Blue Voltage LEDs.
Table 1: Blue Voltage LEDs
State
Cause
Unlit
MPS-482HP not
(all LEDs)
powered on or is
unplugged
Unlit
Surge or short
(single LED)
encountered for channel
CAUTION:
When a blue Voltage LED is unlit,
power down the MPS-482HP, inspect the
loudspeaker cabling for that channel, and check the
fuse.
Green Load Current LEDs (1–2)
The green Load Current LEDs indicate whether
loudspeakers are connected to the channel outputs and
receiving power. As a channel's audio signal level increases,
its LED glows brighter. If an LED is not lit, check that the
channel's Voltage LED is lit and verify the cable connection
to the loudspeaker. Also check to see if the red LED is lit,
indicating a blown fuse for that channel. If a surge or short is
encountered, power down the MPS-482HP, inspect the
loudspeaker cabling for that channel, and check the fuse
and replace if necessary.
Table 2 lists the possible states for the Load Current LEDs.
MPS-482HP OPERATING INSTRUCTIONS
Recommended Action
Verify the MPS-482HP is
powered on and verify its
power source
Power down the MPS-
482HP, inspect the
loudspeaker cabling for
the channel and check
fuse
11
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