AT500NC Manual
Rev-10/17
Appendix A - Troubleshooting Guide
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 oc-
casional 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. Please be sure to thoroughly check all other connected
components such as speakers and preamplifiers, as well as cables. If the problem persists, please consult your installer,
dealer, distributor or us for assistance.
10
Problem
Possible Cause(s)
Solution
No power or front panel lights
The power cable is not inserted
100% into the AC input connector.
Ensure that the AC cord is fully inserted into the
amplifier and that the wall outlet is active.
No power or front panel lights
Circuit breaker is open (AC wall
outlet)
Check the AC outlet circuit breaker and reset, if
necessary, or contact your dealer.
No power or front panel lights
Chassis Fuse is open
Replace chassis fuse with the same type and current
rating.
Amplifier will not turn on or off when a
trigger cable is connected.
Improper wiring of remote trigger Check voltage , polarity and connection of trigger
wire.
Amplifier turns on, but there is no audio
from one or more channels.
Input cables are not connected to
proper jack or are loose.
Check all input connections.
Amplifier turns on, but there is no audio
from one or more channels.
Input select switches are in the
wrong position.
Check all input select switches and make sure they
are in the correct position for the connection type,
XLR or RCA
Amplifier turns on, but there is no audio
from one or more channels.
Speakers are not connected
properly.
Check speaker connections at the amplifier and
speaker.
Audio levels differ.
Improper settings or output levels
from processor or controller.
Check the settings on you preamp, processor or con-
troller.
No audio output
Overheating, DC at output, Cata-
strophic failure
The amplifier will turn off. For any but a cata-
strophic failure, the amplifier can be reset by remov-
ing the fault and completing the turn-on sequence
again.
Model
AT528
NC
AT527
NC
AT526
NC
AT525
NC
AT524
NC
Fuse Rating (120VAC)
20A
20A
16A
16A
12.5A
Fuse Rating (240VAC)
12.5A
10A
8A
8A
6.3A
Model
AT523
NC
AT522
NC
AT544
NC
AT543
NC
AT542
NC
Fuse Rating (120VAC)
10A
6.3A
20A
16A
12.5A
Fuse Rating (240VAC)
5A
4A
12.5A
8A
6.3A
Appendix B - Model Fuse Ratings
All fuses are 5×20mm Time-Lag surge withstand ceramic body cartridge fuses. If needed, replace the fuse with the
same type and current rating for your model. Please contact ATI customer service if you need more information.
