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Diagnostics & Trouble Shooting
The key to finding the problem in a troubled sound system is to isolate parts of that
system in a logical fashion to track down the fault and correct the issue.
The diagnostic system will not shut down the crossover or the amplifier(s), although
the amplifier(s) own protection circuitry may shut the amplifier(s) down, should a fault
status occur. You will need to consult the owners manual for that particular amplifier.
Low Output
Power
Fuses
Blowing
Fuses
Blowing
Hiss, or
White Noise
Electrical
Interference
1) Check that level controls have been set up properly.
2) Make sure that the battery voltage, as measured at the
amplifier(s) and crossover +12 volt and ground terminals,
is 11 volts or more.
3) Check all +12 volt and ground connections.
1) Insure that the voltage to the unit does not exceed 15 volts.
2) A short on the main +12 volt cable from the battery to the vehicle
chassis will cause the main fuse to blow.
3) If the HF7BEQ is blowing fuses continually with only +12 volt,
ground and remote leads connected, the unit may be faulty.
1) Check all fuses.
2) Check all connections.
3) Measure the +12 volt and remote turn on voltages at the
amplifier(s) and crossover terminals. If these are nonexistent or
low, take voltage measurements at fuse holders, distribution
blocks, the head unit's +12 volt, and remote leads to localize
the problem.
1) High levels of white noise usually occur when level controls are
turned up too high – reduce the levels until the noise is no
longer present.
2) Another problem that can cause excessive hiss, is a noisy
head unit – unplug the crossover input RCA's, and if the hiss level
reduces, the source unit is at fault.
The inside of an automobile is a very hostile electrical environment. The
multitude of electrical systems, such as the ignition system, alternator, fuel
pumps, and air conditioners, create radiated electrical fields, as well as
noise on the +12 volt supply and ground. To try and eliminate this noise,
run a wire from the radio ground wire to the ground input on the equalizer.
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