Ok.. I hooked up an Amp in my Ford Taurus, to the factory radio.. Worked
perfect.. My boyfriend (Whom doesnt know anything about electricity..)
Decides to touch a speaker that is connected to the amp, back to the factory
speaker out let... The speakers hum.. He lets them go.. Nothing..... Silence.
I checked Fuses, left and right.. Nothing. After all, I gave up, COMPLETELY
disconnected my Amp, returned all the wires back to their "out of the
factory" state, clamped them with insulated clamp connecters, Checked them,
they all are connected, and on right. Checked EVERY fuse in the fuse boxes...
even bought a new head unit for the car, and still, NO SOUND. The display and
clock come on.. You can channel surf, it shows you what stations come in..
You can turn the volume completely up.. But, No sound... What possibly is the
deal? Is there a fuse inside the radio that I can't find, that maybe is blown?
Also, My fiance's truck, (No amplifier) Hit a bump, no sound.. Everything
comes on.. No sound.. I checked his wires and fuses and well, Nothing is out
of place... Any info on that? I appreciate your help, and THANK YOU!!!
IC stands for Integrated Circuit chip. In this application, it's a series
of transistors that actually performs the task of "amplifying" the audio.
The source audio, which is a very low level, is fed into a transistor, and
it amplifies it as much as it can. Any single transistor can't amplify a
whole lot, but the output is "louder" than the input, which is the key.
Manufacturers chain transistors together so that the output of one
transistor goes to the input of the next transistor and so on, until the
signal level is powerful enough to drive the speakers. Since no single
transistor provides sufficient "gain" to the signal, usually multiple
transistors are put together into a single unit, called an Integrated
Circuit. This makes things easier for the manufacturers, and makes things
What Steve R. was saying was, when you shorted the add on amplifier, you
sent that "load" back through that amp to the factory amplification stage,
and almost certainly "overloaded" the IC's and burned them up. Each
amplifier is designed to handle a certain load. Speakers usually provide
that load. The most common load is 8 ohms, but there are some amps that can
drive 4 ohm loads, or even 2 ohm loads. Even so, when you short the wires,
you're providing what's basically a 0 ohm load. No amp will handle that for
In another post, I mentioned that if you could disassemble the RCU, and if
you could find the amplifier IC's, and if they were socket mounted, you
might be able to fix this yourself. Otherwise, you're going to have to
replace the RCU.
Ok, Say I take apart the RCU, Is there any description on the IC's? what they
look like? Where I can go to pick up new ones? We have a part store here, But
I garantee they wouldnt carry stuff like that.. Perhaps Cartunes, O'rielys?
The first thing to do is get a schematic of the RCU, and I have no idea
where to point you to find that. Then you'd have to hope that the IC's are
socket mounted. If they're surface mounted, and soldered in place, you have
little chance of doing the intricate soldering needed.
The best thing for you to do is go to the junkyard and get another RCU.
If the amp IS bad... The speaker wires should have input into the amp, just
since the amp is blown the sound doesnt pass 'Through' the amp.... Correct???
So perhaps if I splice one speaker connection (Both negative and positive)
before they enter the factory amp, and attach the neg and pos directly into a
speaker.... shouldnt they're be sound???? I done this, and, well... there
wasnt any sound... Does this mean the factory amp ISNT the problem? Perhaps
its something BEFORE the amp? GAH... now Im WAY confused again..
No, not at all. The audio signal coming in from the airwaves, and picked up
by your tuner, for example, is measured in milliwats. There's no way that
signal can drive a speaker. It has to be amplified. You're thinking of the
idea of an "amp" as an add on to the radio. What I'm trying to tell you is
that amplification is part and parcel to the radio's working. Immediately
after the tuning stage in a radio is an amplification stage. This is
separate from any additional high power amplifier you might add on later.
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