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NILES AUDIO CORPORATION – 1-800-BUY-HIFI – 1-760-710-0992
2 Channel, BridgaBle Power amPlifiers
TROUBLE-ShOOTING GUIdE
When there is a problem consult this guide rst. If the problem persists, or you
have additional questions, call your local Niles dealer or call Niles Technical
Support at 1-800-289-4434. The most common problems relate to hook up.
Have your conguration worksheet handy when you call.
Symptom Possible Causes and Test Procedure
No sound on one
channel
BusMatrix™ DIP switch is not in the correct position. Check your configuration worksheet for
the correct setting and verify.
Short circuit or loose wire at speaker or amplifier terminals. Check that connections are secure
and that there are no loose strands of wire crossing from the positive to the negative terminal
at the back of the amplifier and the speaker.
Short circuit or a break in the speaker wire. Disconnect the speaker wire at both ends, separate
the 2 conductors at both ends and test with a meter for a short circuit. If there is no short,
connect the two conductors at one end and test with a meter for continuity.
Speaker is not working. Connect the speaker to a channel that plays another speaker. Audio
cable to dedicated input is bad. Connect the non-working channel input to another cable that is
known to be good.
Bridging Switch is in the wrong position. Check your configuration worksheet for the correct
setting and verify.
The thermal protection circuit has operated because of overheating caused by over driving or
inadequate ventilation.
No sound on some or
all channels
BusMatrix™ DIP switches are not in the correct positions. Check your configuration worksheet
and verify all settings.
Audio cable to the main bus inputs is bad. Connect the non-working channel input to another
cable that is known to be good. Some or all of the internal amplifier fuses are blown. (Return
the amplifier to your dealer for service).
Hum from all the
speakers
Hum may be caused by a ground loop between two components in the system. Test for a
ground loop by reversing the AC plugs of any components in the system with non polarized AC
plugs.
Check for faulty cables, faulty source material, an ungrounded phono system, cable TV feed or
a defective component.
Amp will not turn on
Master power switch must be on.
AC power cord must be plugged into a working outlet.
Test that the AC power receptacle is working. If the outlet tests O.K., the internal fuses are
blown. Return the amplifier to your dealer for service.