JBL Grand touring series User Manual page 26

Other Important Characteristics
26
Power Consumption
- Operating
the GTS180x when the vehicle is
not running may discharge the
battery. At high volumes, the
amplifier can draw large
amounts of current during brief
bursts. After even a short period
of time, this current drain can
discharge the battery to the
point that it will not start the
vehicle. Although power con-
sumption under "no signal"
conditions is less than a few
amperes, even this small power
usage can discharge a battery
over several hours. When the
GTS180x is turned off, there is no
current drawn from the battery
despite the direct-to-battery
power connection.
Overload Protection -
The
GTSl8Ox incorporates elaborate
protection circuitry to prevent
damage to the amplifier circuitry
and ensure reliable operation.
This circuitry will turn the ampli-
fier off and cause the power indi-
cator to blink in the event of a
short circuit on the speaker output
wiring, or improper power supply
connections. If the amplifier cy-
cles on and off, or does not work
at all, either a problem in installa-
tion or an abnormal electrical
condition is indicated. Check
speaker wiring for short circuits
or impedance loads significantly
below 2 ohms (4 ohms in bridged
mode). Check the power supply
voltage at the input of the ampli-
fier to be sure that it is normal,
between 11 V and 16V. Check that
the power wires are not reversed.
If the GTS180x is operated at
very high power levels in a high
ambient temperature situation,
the unit may not be able to radi-
ate all the heat generated by
such operation. If the tempera-
ture of the amplifier reaches a
level that could cause damage,
the thermal overload protection
circuit will turn the amplifier and
the power indicator off. It will
turn the amp back on again when
it cools off. Repeated activation
of the protection circuits indi-
cates that the system is being im-
properly operated or that the
amplifier should be relocated to
an area that either has a lower
ambient temperature or one
which allows more air circulation
around the unit.
Fuse Replacement -
If the fuse
on the GTSlEOx must be re-
placed, DO NOT use a fuse rated
for higher current levels. The
maximum fuse size for the
GTS180x is listed in the specifica-
tions. Exceeding the standard
fuse size or bypassing the fuse-
holder will void the warranty and
may cause serious damage. It is
extremely rare for this fuse to
blow. If it blows repeatedly, it is
most likely that the amplifier has
an internal problem that will
need to be repaired by an autho-
rized service center. The only ex-
ternal cause for this fuse to blow
is reversed polarity of the power
wire connections.