Troubleshooting Testing - DLS Reference ACW68 User Manual

Troubleshooting testing

lf you experience operation or performance problems with this product, compare your installation
with the electrical wiring diagram on the previous pages. lf problems persist, read the following
troubleshooting tips which may help eliminate the problems.
Amplifier will not
power up.
Protection LED
comes on when
amplifier is
powered up.
No output.
Low output.
High hiss in the
sound.
Engine noise
(static type).
Engine noise
(alternator whine).
Amplifier gets very
hot.
Check to make sure you have a good ground connection.
Check that the Remote lnput {Turn-On) has at least 5VDC.
Check that there is battery power on the (+) terminal.
Check that there is at least 12v.
Check all fuse, replace if necessary.
Make sure that the Protection LED is not illuminated. lf it is lit, shut off the
amplifier briefly, and then repower it.
Check for short circuits on speaker leads.
Turn down the volume control on the head unit to prevent overdriving. Remote
speaker leads, and reset the amplifier. lf the Protection LED still comes on, then
the amplifier is faulty and needs servicing.
Check that all fuses are OK.
Check that unit is properly grounded.
Check that the Remote lnput {Turn-On) has at least 5VDC.
Check that the RCA audio cables are plugged in to the proper inputs.
Check all speaker wiring.
Reset the Level control.
Check the crossover control settings.
Disconnect all RCA inputs to the power sub's control panel. lf the hiss
disappears, then plug in the component driving the amplifier and unplug its
inputs. if the hiss disappears at this point, go on until the faulty noisy compo-
nent is found. It is best to set the amplifier's input level control as low as
possible. The best subjective signal-to-noise ratio is achieved in this manner.
Try to set the head unit as high as possible
This is usually caused by poor quality RCA cables, which can pick up radiated
noise. Use only the best quality cables, and route them away from power
cables.
Check that the RCA grounds are not shorted to the vehicle chassis Check that
the head unit is properly grounded.
Check that there is good air circulation around the amp. In same applications, it
may be necessary to add and external cooling fan.
8