4.
Increase the volume and verify that the amplifier reproduces the audio at full
frequencies without distortion.
If
you hear distortion check the connections and verify that the gain control is set
correctly. Another cause of distortion could be underpowered or damaged speak-
ers. Refer to Troubleshooting.
Indicator lights
The APX2180, APX4360, DPX1800 and DPX11500 have lights that indicate amplifier
status.
Blue top
LEO
on
Red end-
panel
light
off
Blue end-
panel light
off
Meaning
Amplifier running normally
on
slow blink
quick blink
alternating between red and blue
slow out-of-sync off
blink
quick in-sync off
blink
In
thermal protection mode
Over voltage;
reduce the input voltage
Short circuit protection
3 blinks, then pause 3 blinks, then pause off
No Audio
Repeated shorts detected;
remove the short circuit, wait
5 minutes for error condition
to clear; or clear condition by
removing the main power, for
example, by pulling the fuse.
• Low or no remote turn-on voltage: check remote connections at the amplifier and
source unit.
•
Blown
amplifier
,fuse:
replace with a
new
fa8t-bl~w
fus~
(sam~
rAtil"lg).
• Power wires not connected: check battery and ground wiring at the amplifier and
check the battery connections.
• Speaker leads shorted: check speaker continuity to ground; it should not show a
common ground.
• Speakers not connected or are blown: check speaker connections at the ampli-
fier and measure at speakers. Measure coil impedance at amplifier with speaker
wires disconnected.
APXlDPX Amplifiers
21
4.
Increase the volume and verify that the amplifier reproduces the audio at full
frequencies without distortion.
If
you hear distortion check the connections and verify that the gain control is set
correctly. Another cause of distortion could be underpowered or damaged speak-
ers. Refer to Troubleshooting.
Indicator lights
The APX2180, APX4360, DPX1800 and DPX11500 have lights that indicate amplifier
status.
Blue top
LEO
on
Red end-
panel
light
off
Blue end-
panel light
off
Meaning
Amplifier running normally
on
slow blink
quick blink
alternating between red and blue
slow out-of-sync off
blink
quick in-sync off
blink
In
thermal protection mode
Over voltage;
reduce the input voltage
Short circuit protection
3 blinks, then pause 3 blinks, then pause off
No Audio
Repeated shorts detected;
remove the short circuit, wait
5 minutes for error condition
to clear; or clear condition by
removing the main power, for
example, by pulling the fuse.
• Low or no remote turn-on voltage: check remote connections at the amplifier and
source unit.
•
Blown
amplifier
,fuse:
replace with a
new
fa8t-bl~w
fus~
(sam~
rAtil"lg).
• Power wires not connected: check battery and ground wiring at the amplifier and
check the battery connections.
• Speaker leads shorted: check speaker continuity to ground; it should not show a
common ground.
• Speakers not connected or are blown: check speaker connections at the ampli-
fier and measure at speakers. Measure coil impedance at amplifier with speaker
wires disconnected.
APXlDPX Amplifiers
21
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