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DPA250 OPERATION
Troubleshooting
Problem
Unit will not turn on
(no power LED indicator)
Unit has power - power
LED is green
(but no sound)
Unit blows fuse(s)
Engine noise
Protect LED illuminates
red
(protect mode)
Distorted audio output Incorrect input signal type or
Low audio output
Weak bass
10
Cause
+12V wire not connected or incorrect voltage
REM wire not connected or incorrect voltage
GND wire not connected
Fuse(s) blown
Speaker wires not connected
Volume turned all the way down
One or more speaker wires touching each
other or touching chassis ground
Speaker(s) defective or damaged
Input signal not connected
Incorrect fuse rating
+12V wire touching chassis ground
Speaker(s) defective or damaged
Bad ground connection
Signal ground loop or RFI (radio frequency
interference)
One or more speaker wires touching each
other or touching chassis ground
Speaker(s) defective or
damaged internally (shorted)
Speaker load less than 2 ohms (stereo)
Speaker load less than 4 ohms (bridged)
input level too high
Incorrect input signal type or
input level too low
Speaker(s) are wired out of phase
Action
Check connections for proper voltage
(11~16VDC)
Check connection to ground
Replace fuse(s)
Check connections at speakers
Increase volume level at head unit
Insulate all bare speaker wires from each
other and chassis ground
Check/replace speaker(s)
Check low level inputs for proper
connection
Use fuse(s) with correct rating
Check for pinched wire
Check/replace speaker(s)
Make sure amplifier ground wire is
connected to clean bare metal
Re-route RCA cables from existing high
current wiring
Insulate all bare speaker wires from each
other and chassis ground
Check/replace speaker(s)
Adjust speaker load - amplifier will not
operate at less than 4 ohms when bridged
Check connections and reduce/adjust input
level
Check connections and increase/adjust
input level
Check (+) and (-) speaker connections
(Observe correct polarity)
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