a/d/s/ P850 - Manual (Page 5)

23 4
Troubleshooting
symptom possible cause action to take
no output low or no remote turn-on input check remote turn-on voltage
output at amplifier and correct
as needed
fuse blown check power wire integrity
and reversed polarity, repair
as needed and replace fuse
power wires not connected check power wire and ground
connections and repair or
replace as needed
audio input not connected or check input connections and
no output from source signal integrity, repair or
replace as needed
speaker wires not connected check speaker wires and repair
or replace as needed
audio cycles on and off speakers are blown check system with known
working speaker and repair or
replace speakers as needed
thermal protection engages make sure there is proper
when amplifier heatsink ventilation for amplifier and
temperature exceeds 90° C improve ventilation as needed
loose or poor audio input check input connections and
repair or replace as needed
distorted output amplifier level sensitivity set too reset gain referring to the
high; exceeding maximum
tuning section of the manual
output capability of amplifier for detailed instructions
impedance load to amplifier too check speaker impedance load
low
if below 2 W stereo or 4W
mono rewire speakers to
achieve a higher impedance
shorted speaker wires check speaker wire
connections and repair or
replace as needed
speaker not connected to check speaker wiring and
amplifier properly repair or replace as needed
refer to the installation section
of this manual for detailed
instructions
internal crossover not set reset crossovers referring to the
properly for speaker multi-cross TM crossover
configuration section of this
manual
system planning
Proper system planning is the best way to maximize your PowerPlate TM ’s performance. By planning
your installation carefully you can avoid situations where the performance or the reliability of your
system is compromised. Your authorized a/d/s/ dealer has been trained to maximize your
system’s sonic potential. Your a/d/s/ dealer is a valuable resource in helping you with your system
design and installation.
speaker requirements
Each channel of your PowerPlate
TM can easily drive 2 W speak-
er loads when used in the stereo mode. When a channel-pair
is bridged, the recommended minimum load impedance is
3
W for subwoofer use, and 4 W for full range operation.
Although operation with lower impedances is not likely to
cause immediate damage to the internal circuitry, the unit
will most likely overheat, causing the thermal protection cir-
cuitry to shut down the amplifier. When the chassis cools
down, normal operation will resume. Continuing to operate
the amplifier under these conditions is not recommended
and will reduce its life expectancy.
Most speakers designed for car audio operation are 4 W
impedance. Connecting two such speakers in parallel will
result in a 2
W
impedance load as seen by the amplifier. Some a/d/s/ sub-
woofer models feature a dual 4
W voice coil design. Connect-
ing these voice coils in parallel will result in a 2 W nominal
impedance which is not recommended for use with bridged
channels of your PowerPlate
TM .
system configurations
All a/d/s/ PowerPlates TM provide extensive features which make a variety of system configurations
possible. It is not feasible to cover all of the possibilities within the few pages of this manual.
There are a few system configurations, however, which are extremely popular when used alone or
as a "building block" of a larger more elaborate system. Please review systems 1 through 4
described below for suggestions on how to configure the most popular combinations. Larger
systems may be built from a combination of the simpler building blocks as shown in systems
5 and 6.
button is disengaged control is non-operational
control is operational button is engaged