Dual Electronics DA704L - Manual (Page 9)

Problem Cause Action
Unit will not turn on
(no power LED
indicator)
+12V wire not connected or incorrect
voltage. REM wire not connected or
incorrect voltage
Check connections for proper voltage
(11~16VDC)
GND wire not connected Check connection to ground
Fuse(s) blown Replace fuse(s)
Unit has power -
LED is green (but
no sound)
Speaker wires not connected Check connections at speakers
Volume turned all the way down Increase volume level at head unit
One or more speaker wires touching
each other or touching chassis
ground
Insulate all bare speaker wires from
each other and chassis ground
Speaker(s) defective or damaged Check/replace speaker(s)
Input signal not connected
Check high or low level inputs for
proper connection
Unit blows fuse(s)
Incorrect fuse rating Use fuse(s) with correct rating
+12V wire touching chassis ground Check for pinched wire
Speaker(s) defective or damaged Check/replace speaker(s)
Engine noise
Bad ground connection
Make sure amplifier is grounded to
clean bare metal
Signal ground loop or RFI (radio
frequency interference) Re-route RCA cables from existing
high current wiring
LED illuminates red
(protect mode)
One or more speaker wires touching
each other or touching chassis
ground
Insulate all bare speaker wires from
each other and chassis ground
Speaker(s) defective or
damaged internally (shorted)
Check/replace speaker(s)
Speaker load less than 2 ohms
(stereo). Speaker load less than 4
ohms (bridged) Adjust speaker load - amplifier will
not operate at less than 4 ohms
when bridged
Distorted audio
output
Incorrect input signal type or
input level too high Check connections and reduce/
adjust input level
Low audio output
Incorrect input signal type or
input level too low Check connections and increase/
adjust input level
Weak bass Speaker(s) are wired out of phase
Check (+) and (-) speaker
connections
(Observe correct polarity)
INSTALLATION
Troubleshooting
9