Question about Eclipse (XA1000) Car Audio Amplifier
I recently replaced my two 12" subs due to a problem in the voice coils. It seems they were pushed beyond their limits and they broke. These I had installed in parallel and enclosed in a dual bandpass box. I replaced them with a pair which I initially thought would provide more options a pair of dual voice coil 12" subs. The problem that I have is that when I initially wired them in parallel I believe that presented my amp with a 1 ohm load, this was only temporary as both of the 20amp fuses in my amp blew and I discontinued testing. I disconnected the box and tried rewiring the subs dvc in a 4 ohm configuration, which is a combo of parallel and series wiring. This when reconnected and with fresh fuses in my amplifier provided a different but equally disappointing outcome. It worked for a short while and when then the amp began going into protect mode. What happens here is the logo which lights up and the clipping light blink on and off, the clipping light is red not yellow as it normally would be in a clipping situation. So once again I disconnected the box pulled the subs and wired them exactly as if they were single voice coil subs, only connecting positive and negative to one set of terminals. this time when I hooked it back up to the system and did a test with the vehicle off they sounded fine. so I turned the vehicle on and they worked for about ten minutes as I was driving the vehicle then the same thing happened. The amp went into protect mode, blinking on and off. Another thing I noticed was that there seems to be no problem in operation at a voltage of about 12volts, when the vehicle is running this is obviously not the case and the voltage is around 14volts which the amp never had a problem with before. Is there any way to fix this without taking the amp apart or having it serviced? Also as part of my system I have two other amps which run the full range speakers and they have not been affected. The sub amp is an Eclipse d class XA1000, its power is taken directly from a 2.0 farad capacitor and I've only had it for two months. Any help or thoughts would be greatly appreciated.
It's likely that the output transistors failed. That's the most common cause for an amplifier to go into protection. With no power applied to the amp, set your meter to ohms and measure the resistance between the terminals of the output transistors. You should find none that have anything close to zero ohms between any of the terminals. If you find one or more that have ~0 ohms between therminals, they need to be removed from the circuit and checked. If you have several in parallel, it may seem as though the entire group is shorted but generally one fails and the others are OK. Of course, when you have one defective transistor in a group of parallel transistors, you must replace all of the transistors in that group. Open or broken emitter resistors can cause an amp to go into protect. If you don't find any shorted outputs, make sure there are no broken terminals on the emitter resistors.
Posted on Jul 16, 2006
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