APX_DPX Amps.qxd 2/6/2008 11:53 AM Page 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 speakers. Refer to Troubleshooting.

6.TROUBLESHOOTING Indicator lights

The APX2181, APX4361, DPX1851 and DPX11551 have lights that indicate amplifier status.

Blue top

Red end-

Blue end-

 

LED

panel light

panel light

Meaning

On

Off

Off

Amplifier running normally

On

Alternating between

In thermal protection mode

 

red and blue

 

 

Slow blink

Slow out-of-sync

Off

Over voltage;

 

blink

 

reduce the input voltage

Quick blink

Quick in-sync

Off

Short circuit protection

 

blink

 

 

3 blinks,

3 blinks,

Off

Repeated shorts detected;

then pause

then pause

 

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.

 

 

 

 

English

No Audio

Low or no remote turn-on voltage: check remote connections at the amplifier and source unit.

Blown amplifier fuse: replace with a new fast-blow fuse (same rating).

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 amplifier and measure at speakers. Measure coil impedance at amplifier with speaker wires disconnected.

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Clarion DPX11551, APX2181, APX4361 owner manual No Audio, Blue top Red end Blue end