AC Fuse
Your amplifier is supplied with a rear panel mounted main AC fuse. This main fuse may need replacement if the unit will not turn on. Never replace the the main fuse with other than the one indicated.
Clip Limiters
Your amplifier is equipped with a unique clip limiting circuit. If the amplifier is driven beyond the point of maximum output the clip limiting circuit will engage and prevent potentially damaging distortion from reaching your loudspeakers. The amplifier will continue to operate with no apparent change in performance. This feature is automatic and requires no adjustment or maintenance.
Protection Circuitry
Your ATI amplifier uses an advanced optically coupled protection circuit that does not require fuses and is completely isolated from the audio path. In the event that the amplifier senses a shorted speaker wire the protection circuit will engage shutting down the output and will sample the state of the amplifier every 7 seconds (nominal). The output will be cut off as long as the short exists. The amplifier will begin to operate normally after the shorted situation is repaired.
If this should happen, first check all speaker wire connections, both at the speakers themselves and at the speaker terminals on the back of the amplifier to make certain that none of the strands from any channel touch another channel, and that none of the strands from a "positive" terminal touch those from a "negative" terminal. Even a few stray wire strands can cause the unit to go into the protection mode. After checking all speaker connections, turn the unit back on. If it continues to turn off, check your speakers to verify that they are operating properly. If all other potential sources of trouble check out properly, contact ATI for further assistance and information.
ATI Service Information
The AT602 and the AT1202 do not contain any user serviceable parts inside. If you suspect a problem that may require service assistance, contact us at amptech@ix.netcom.com, or by phone at
Care, Maintenance and Cleaning
When the unit becomes dirty, wipe it with a clean, soft, dry cloth. If necessary, first wipe the surface with a slightly dampened soft cloth with mild soapy water, then with a fresh cloth dampened with clean water. Wipe dry immediately with a dry cloth.
NEVER use benzene, thinner, alcohol or any other volatile cleaning agent. Do not use abrasive cleaners, as they will damage the finish of the metal parts. Avoid spraying insecticide, waxes, polishing agents, or any aerosol product near the unit.
Troubleshooting
Your ATI amplifier is designed for trouble free operation.
If you follow the instructions in this manual you should enjoy many years of high quality listening enjoyment. However, as with any sophisticated electronic device, there may be occasional problems upon initial installation, or during the life of the unit. The items on the list below are a brief guide to the minor problems that you may be able to correct yourself. If these solutions do not rectify a problem, or if the problem persists, contact us for assistance.
Problem | Solutions |
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|
Amplifier will not turn on | Master Power Switch tuned off (No power light LED). |
| Turn on Master Power Switch. |
|
|
Amplifier will not turn off. | Remote trigger cable not properly connected. |
| Verify connection of trigger cable at both ends. |
|
|
Amplifier turns on, but no audio from one or more channels. | Input plugs not connected to proper jack or are loose. |
| Check input connections. |
No audio from one or more channels.
Speakers not connected properly.
Check speaker connections at amp and speaker.
Audio levels differ. | Improper settings or output levels from source device. | |
| Check the settings on your preamp, processor or controller. | |
| Also check settings of the rear panel gain conrols on your amp. | |
|
|
|
Audio plays, then cuts off. | Amplifier shorted. | |
| Check speaker connections for short circuit at amp and speaker. | |
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