Troubleshooting a System

The key to finding the problem in a misbehaving sound system is to isolate parts of that system in a logical fashion to track down the fault.

Description of the PROTECT system built into all Autotek amplifiers

The diagnostic system will shut down the amplifier, until reset by turning the head unit off, and back on. This state of affairs will be indicated by the front panel PROTECT LED lighting up under the following conditions:

1 - A sort circuit on the loudspeaker leads.

2 - An internal amplifier fault that causes a DC offset on the loudspeaker output.

Should the amplifier go into protect mode, simply disconnect all RCA and speaker leads, while keeping +12 volt, power ground and remote leads connected.

1.Now turn the amplifier back on, and if the diagnostic LED lights, the amplifier has an internal fault.

2.If not, plug the RCA cables back, and reset the amplifier. If it goes into diagnostic now, the fault lies in the input, either with bad cables or source unit.

3.If the amplifier seems fine with RCA cables plugged in, connect the speakers, one at a time, and if one of the speakers or its wiring is faulty, it will activate the diagnostic system.

Amplifier heatsink overheating

The amplifiers will shut down when the heatsink temperature reaches 80 degrees centigrade, and turn back on once the unit has cooled down below that point. Causes of overheating:

1 - Inadequate cooling - relocate or remount to provide better natural airflow over the fins.

2 - Driving high power levels into low impedances - back off on the volume control, and/or make sure you are not loading the amplifier with less than the recommended loudspeaker impedance.

Low output power

1 - Check that level controls have been set up properly.

2 - Make sure that the battery voltage, as measured at the amplifier’s +12 volt and ground terminals, is 11 volts or more. 3 - Check all +12 volt and ground connections.

Fuses blowing

1 - The use of loudspeaker impedances below the recommended minimums will draw more current - check.

2 - A short on the main +12 volt cable from the battery to the vehicle chassis will cause the main fuse to blow.

3 - If an amplifier fuse blows continually, with only +12 volt, ground and remote leads connected, the amplifier may be faulty.

System does not turn on 1 - Check all fuses.

2 - Check all connections.

3 - Measure the +12 volt and remote turn on voltages at the amplifier terminals. If these are non existent or low, take voltage measurements at fuse holders, distribution blocks, the head unit’s +12 volt and remote leads to localize the problem.

Noise problems

System noise can be divided into two categories, hiss, and electrical interference.

Hiss, or white noise

1 - High levels of white noise usually occurs when amplifier level controls are turned up too high - readjust according to the procedures in section ”Setting up systems after installation for best performance”

2 - Another major problem that can cause excessive hiss, is a noisy head unit - unplug the amplifier input RCA cables, and if the hiss level reduces, the source unit is at fault.

Electrical interference

The inside of an automobile is a very hostile electrical environment. The multitude of electrical systems, such as the ignition system, alternator, fuel pumps, air conditioners, to mention just a few, create radiated electrical fields, as well as noise on the +12 volt supply and ground. Remember to isolate the problem - first unplug amplifier input RCA cables, if the noise is still present, check the speaker leads, if not, plug the RCA’s back, and investigate the source driving the amplifier, one component at a time.

A ticking or whine that changes with engine RPM:

1 - This problem could be caused by radiation pickup of RCA cables too near to a fuel pump or a distributor, for instance, - relocate cables.

2 - Check that the head unit ground is connected straight to the vehicle chassis, and does not use factory wiring for ground.

3 - Try to supply the head unit with a clean +12 volt supply directly from the battery +, instead of using a supply from the in dash wiring/fusebox.

A constant whine:

This type of noise can be more difficult to pinpoint, but is usually caused by some kind of instability, causing oscillations in the system. 1 - Check all connections, especially for good grounds.

2 - Make sure that no speaker leads are shorting to exposed metal on the vehicle chassis.

3 -RCA cables are notorious for their problematic nature, so check that these are good, in particular the shield connections.

AT1500, AT-Series, AT1200, AT3000.1, AT2000.1 specifications

AutoTek has made significant strides in the automotive technology landscape with the introduction of its AT-Series products, including the AT1000, AT2000.1, AT3000.1, and AT1200. These devices are tailored for both automotive professionals and DIY enthusiasts, showcasing advanced features and cutting-edge technologies that facilitate efficient vehicle maintenance and diagnostics.

The AT1000 is the entry-level model in the AT-Series, designed to offer an easy-to-use interface with essential diagnostic functions. Key features include basic OBDII scanning capabilities, enabling users to read and clear trouble codes, along with a live data stream for monitoring vehicle performance. Its compact design makes it an excellent choice for those new to vehicle diagnostics, providing valuable insights without unnecessary complexities.

Stepping up, the AT2000.1 enhances the diagnostic experience by integrating more advanced functions. It supports a wider range of vehicles and protocols, making it suitable for professionals dealing with various automotive brands. The AT2000.1 introduces advanced features like freeze frame data and enhanced live data parameters, allowing users to analyze vehicle performance in real-time and make informed repair decisions. Its intuitive graphical interface simplifies complex data presentation, catering to both novices and experts.

For those seeking the pinnacle of diagnostic technology, the AT3000.1 stands out with its comprehensive coverage and advanced capabilities. This model integrates advanced fault code analysis, bi-directional control, and extensive vehicle coverage across multiple makes and models. Additionally, the AT3000.1 offers advanced features like ECU programming and key coding, positioning it as an essential tool for professional mechanics and automotive technicians.

The AT1200 bridges the gap between simplicity and advanced technology, offering features like vehicle health reports and an extensive database of repair information. It also includes a touchscreen interface for ease of navigation, comprehensive vehicle coverage, and capabilities for both basic and advanced functions, making it an ideal tool for technicians who need versatility in their work.

All models in the AT-Series are designed with user experience in mind, featuring rugged build quality for durability, easy firmware updates, and compatibility with various operating systems. With a focus on making vehicle diagnostics accessible and efficient, AutoTek's AT-Series represents a reliable choice for anyone in the automotive field. The blend of affordability, advanced features, and robust performance across the AT1000, AT2000.1, AT3000.1, and AT1200 ensures that every user can find a model suited to their needs, paving the way for a new standard in automotive diagnostics.