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MODEL 5002IQ©
(1991-MSRP: $1200.00)
OWNER'S MANUAL AND
INSTALLATION GUIDE
INTRODUCTION
Latest technology, high sound quality, powerful delivery and LINEAR POWER™
reliability all describe LINEAR POWER™ amplifiers. With new "IQ©" circuitry,
their value increases. Versatile capabilities such as stereo, mono or mixed
stereo/mono operation and 2 ohm capability make these amplifiers extremely
desirable to build an entire system around or begin a system.
TECHNICAL DESCRIPTION
The "IQ©" series amplifiers are a series of inverted channel ("I") amplifiers. A
quiet turn on circuit ("Q") has been added for improved performance. The
amplifier design incorporates an unregulated power supply for increased dynamic
headroom and efficiency. The TO-3 output stages of these amplifiers will deliver
a significant increase in power into 2-ohm stereo loads. Amplifier reliability is
accomplished by operating the output transistors at 50% of their maximum rating
even into a 2-ohm stereo load.
CONSTRUCTION
Power Supply: Self oscillating for reliability and efficiency. The transformer is
epoxy dipped for extreme vibration resistance. Banks of high-speed TO-3
switching transistors provide massive current reserves. The amplifier design
incorporates an unregulated power supply for increased dynamic headroom and
efficiency.
Output Stages: Transformerless, direct coupled and fully complimentary. Output
transistors are high current and low distortion TO-3 devices, operating at a
fraction of their limitations. In 4-ohm stereo, the output devices in the 5002IQ
work at less than 30% of their design capabilities as engineered by Motorola.
Linear Power™ products are seriously over built!
© 2008 Linear Power, Inc. - ALL RIGHTS RESERVED
LINEAR POWER™ is a trademark of Linear Power, Inc.
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Protection: Our stable amplifier design is made virtually indestructible by three
protection circuits. One is a precision thermal protection circuit, which prevents
damage from high frequency oscillation, or an excessive ambient temperature.
The second protection circuit is a current sensing device guarding against
instantaneous abnormalities, such as short circuits. Both of these circuits
automatically reset. The third form of protection guards against component
damage from reversed power connections.
Construction Features: Our unique, variable input sensitivity control permits
optimal signal matching for lowest noise and lowest distortion with virtually any
source. All components used are rated for at least 150% of their intended use,
and are mounted on double-sided fiberglass epoxy circuit boards.
Quality Control: In-house construction of critical components like transformer
and chassis, as well as total assembly, allows LINEAR POWER™ to maintain
uniform quality. 100% of the finished units are tested, then burned in for four
hours, and tested again. Amplifiers, which pass this rigorous test, have truly
earned the LINEAR POWER™ logo.
WIRING
Disconnect battery ground cable before making any power connections.
RED WIRE: +12 volts. Connect directly to battery positive terminal and should be
fused within 18 inches from the battery and another fuse where the connection to
the amplifier is made. Remember to use the proper size fuses. WARNING:
USING OVERSIZED FUSES IS DANGEROUS AND WILL DAMAGE YOUR
AMPLIFIER! See specifications for proper fuse size.
BLACK WIRE: Negative Ground. Connect to clean unpainted metal surface on
char chassis.
RED/WHITE WIRE: Remote turn on lead requires 12 volts; connect to power
antenna lead from radio. When this is not available, you may connect to a +12
volts wire that is on with the ignition on or in the accessory position.
RCA CONNECTIONS: Connect with quality-shielded patch cords from source,
crossover, or any other sound processor.
SPEAKER CONNECTIONS: Connect speaker terminals to amplifier, facing the
terminal, left to right, Left (-), Left (+), Right (-), and Right (+). For mono
operation use left positive (+) and right negative (-). These amplifiers are capable
of 2-ohm operation in stereo or 4 ohms in mono.
OPERATING THE AMPLIFIER AT LESS THAN THESE RATINGS WILL
CAUSE AMPLIFIER FAILURE AND VOID YOUR WARRANTY.
© 2008 Linear Power, Inc. - ALL RIGHTS RESERVED
LINEAR POWER™ is a trademark of Linear Power, Inc.
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TWO-OHM CAPABILITY
NOTE: The 5002IQ© has internal taps for 2-ohm operation. To access, remove
bottom cover. They are located about the middle of the amplifier and are set to 4
ohm at the factory. To change to 2-ohm stereo operation, pull the quick
disconnects off the taps marked “4” and place them on the taps marked “2”. This
will ensure safe operation into 2-ohm stereo loads, as well as 4-ohm bridged
loads.
DYNAMICS IMPROVING PROCESSOR©
(D.I.P.): This switch is accessible through a plug on the bottom of the amplifier. In
the on position it redistributes power in the bass region to help overcome factors
in the mobile environment that limit bass response. This is not simply a "bass
boost" but a carefully measured EQ curve to enhance performance if needed.
WARNING
Your new LINEAR POWER™ amplifier, when used in conjunction with many of
the efficient speaker systems on the market today, can produce sound pressure
levels that are considered harmful to your hearing.
Exposure to loud music may lead to loss in hearing. This effect may not be
readily appreciated because the damage to hearing is progressive. Those who
are exposed to excessive sound pressure should utilize direct individual
protection in the form of earplugs or earmuffs, which are specifically designed for
noise reduction.
In accordance with the OSHA (Occupational Safety and Health Act) regulations
for noise levels as they relate to the work area, excessive sound pressure is
defined as 115db(a) continuous for any length of time.
We recommend that you exercise restraint while enjoying the performance of this
and other high-powered mobile audio equipment.
GAIN ADJUSTMENT
Set the amp gain to minimum, turn the source up until it just starts to distort, then
back down slightly. This is the point where the output of the source is cleanest.
Now adjust the amplifier gain up until it just starts to distort and back down
slightly. This will allow the source and amp to reach maximum usable output at
the same time.
© 2008 Linear Power, Inc. - ALL RIGHTS RESERVED
LINEAR POWER™ is a trademark of Linear Power, Inc.
3
MOUNTING
1.The amplifier works best if it is kept as cool as possible. Mount in a position
that allows air to flow freely through the fins. Be sure there is ample space above
the amplifier to avoid trapping heated air rising from the amplifier. The amplifier
should not be mounted upside down. Avoid mounting any amplifier in the dash or
on the firewall to avoid noises being radiated directly onto the case.
2.The case of your amplifier is designed to act as a noise shield. To maintain this
protection, be sure the metal case of the amp does not touch the metal of the
car. Do not remove or damage the rubber grommets, which provide electrical
insulation and vibration isolation.
GENERAL TROUBLESHOOTING
NO SOUND: Check all connections. Check fuses. With a meter be sure there is
+12 Volts on the main power wire and the turn on wire, but not on the ground
wire. Check by substitution or other method for proper operation of music source.
BLOWS FUSE: Check all connections to be sure all power wires and speaker
wires do not touch ground or each other. Re-check polarity of main power wires.
SHUTS OFF: This amplifier is equipped with a thermal and short circuit
protection. In the unlikely event of excessive temperature or improper speaker
impedances, the amp will turn itself off. When the condition is corrected
(temperature decreases or speaker short is fixed), the amp will turn itself back
on. To avoid damage to the speakers, turn volume to a minimum while waiting for
the amp to turn itself back on.
NOISE TROUBLESHOOTING PROCEDURES
In most any car, the possibility of picking up unwanted noises can be reduced if
the installation is done properly. Keep the system’s wiring away from the vehicles
wiring harness. Do not run the low level signal cables beside the power or ground
cables or next to the vehicle wiring harness. Attach the ground for the amplifier to
a clean, solid portion of the body or frame, as close to the amp as possible. Use
a good grade shielded cable for all low-level signals. Because of the
astronomical number of possible noise problems, a detailed solution to each and
every specific problem is impossible. Here we discuss the major noise types, and
try to proceed from cause and solution of each.
© 2008 Linear Power, Inc. - ALL RIGHTS RESERVED
LINEAR POWER™ is a trademark of Linear Power, Inc.
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TYPES OF NOISE
1. Alternator noise: This is the most common source of noise, and expresses
itself as a high-pitched whine, which increases and decreases in pitch with the
speed of the engine. Unfortunately for sound systems, the cable between the
alternator and the battery forms a beautiful antenna to transmit the alternator’s
noise to anything surrounding it.
2. Ignition noise: Ignition noise is formed by the primary and secondary ignition
systems in gas engines. It is characterized by a rapid ticking or popping noise
that increases or decreases with engine speed. The first form of ignition noise,
from the primary circuit, is caused by the points or solid-state circuitry that fires
the coil. These primary pulses can feed back through the ignition coil and into the
vehicle’s electrical system. The secondary ignition circuit is composed of the
ignition coil, the spark plug wires, and the spark plugs. Since the secondary
circuit operates at quite a high voltage, and since this voltage is pulsed, it forms a
nice radio (noise) station under the hood. This noise is often transmitted to the
vehicle’s wiring harness.
3. Accessory noise: Accessory noise is caused by the electrical noises formed
by the many electrical accessories in the vehicle. The most common noises are
the pops caused by high current switches (like the brake light switch) and
whirring noises caused by the various electrical motors in the vehicle (such as
the fuel pump or fan motor).
ENTRY METHODS
1. Radiation: Radiated noise is the most common problem found. As mentioned
earlier, the worst problem area is the wiring between the alternator and the
battery. The entire wiring harness can become contaminated if a portion of it
runs along side the alternator to battery cable.
2. Ground Loops: Ground loops are the most common way radiated noise gets
into a mobile stereo system. This is especially true of multiple amp systems.
They have more grounding points, and that means more possible locations
for ground loops to form. A ground loop is formed when any ground point is at
a different potential than at any other ground point in the system.
3. Power Lead (+12V) Noise: Since true power lead noise is the only noise that
isn’t radiated, and since the vehicle’s battery (if in good condition) provides
adequate filtering for alternator noise, then only ignition and accessory noise
could enter the system through power leads.
© 2008 Linear Power, Inc. - ALL RIGHTS RESERVED
LINEAR POWER™ is a trademark of Linear Power, Inc.
5
BUILT IN NOISE SUPRESSION
The vehicle’s battery forms a huge capacitor bank that does a fantastic job of
filtering noise. Unfortunately, batteries grow old and lose their ability to hold a
charge. At the same time, they lose their ability to filter noise; even corrosion on
the battery terminals will cause increased noise as it isolates the battery.
If the vehicle is in need of ignition repair or tune up, increased noise will result.
Specifically, check the condition of the points and condenser, as well as the
spark plug leads. More modern electronic ignition systems will have less noise
because of the use of solid-state parts. Don’t forget to check for resistor spark
plugs, too. They help reduce noise.
TROUBLESHOOTING NOISE
Once the type of noise has been determined, the entry method must be located.
The easiest place to start is the amplifier. Unplug the RCA jacks and listen for a
change in the noise level. If little or no change occurs, the amplifier’s power
source is contaminated. If the noise is gone, the possibilities are a ground loop or
a noise problem earlier in the system. If the problem is a ground loop, the best
solution is a better ground for the amp(s). Another solution is to carefully connect
a wire from the shield of the RCA connector, at the amplifier end of the RCA
cables, to a good ground on the vehicle. This will effective short circuit the
ground loop.
The next check is for radiated noise. With the radio still electrically connected to
the vehicle, slowly remove it from its installation, and listen for a change in noise
level, as it is pulled away from the dash and any vehicle wiring harnesses. If you
are dealing with radiated noise, the only solution is isolation. The easiest method
is usually to move the contaminated vehicle wiring harness away from the
stereo’s wiring.
The best way to eliminate power line noise is to install a filter capacitor across
the noise source. The best capacitors to use are .5 mfd 25v bypass capacitors
for the coil, as well as any accessory motors, and a .1 mfd 100v ceramic disc
capacitor for switches. Another way to suppress power line noise is with noise
filters, but be sure the filter is rated for the current of the circuit that you are
installing them on.
© 2008 Linear Power, Inc. - ALL RIGHTS RESERVED
LINEAR POWER™ is a trademark of Linear Power, Inc.
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SERVICE OR REPAIR
To obtain modification, service or repair, please contact our ONLY Authorized
LINEAR POWER™ Product Service Center:
T.I.P.S. INC.
3455 Lanell lane, Pearl, MS 39208
(601) 932-8477
E-mail: [email protected]
™
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© 2008 Linear Power, Inc. - ALL RIGHTS RESERVED
LINEAR POWER™ is a trademark of Linear Power, Inc.
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SPECIFICATIONS
5002IQ
©
5002IQ
RMS Power Output @ 4 Ohms stereo
250 x 2
THD @ full output 20 - 20Khz
.12%
Slew Rate volts/microsecond
16V/ms
Damping Factor @ 4 ohms
©
>210
>75dB
Channel separation
Maximum current
4 ohms
77A
2 ohms
90A
Idle
2A
Fuse rating
60A
Dimensions:
3" x 9.5" x 14.5"
™
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© 2008 Linear Power, Inc. - ALL RIGHTS RESERVED
LINEAR POWER™ is a trademark of Linear Power, Inc.
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