27NILES AUDIO CORPORATION – 1-800-BUY-HIFI – 1-760-710-09922 Channel, BridgaBle Power amPlifiersTROUBLE-ShOOTING GUIdEWhen there is a problem consult this guide first. If the problem persists, or youhave additional questions, call your local Niles dealer or call Niles TechnicalSupport at 1-800-289-4434. The most common problems relate to hook up.Have your configuration worksheet handy when you call.Symptom possible Causes and Test procedureno sound on onechannelbusmatrix™ DiP switch is not in the correct position. check your configuration worksheet forthe correct setting and verify.Short circuit or loose wire at speaker or amplifier terminals. check that connections are secureand that there are no loose strands of wire crossing from the positive to the negative terminalat the back of the amplifier and the speaker.Short circuit or a break in the speaker wire. Disconnect the speaker wire at both ends, separatethe 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. audiocable to dedicated input is bad. connect the non-working channel input to another cable that isknown to be good.bridging Switch is in the wrong position. check your configuration worksheet for the correctsetting and verify.The thermal protection circuit has operated because of overheating caused by over driving orinadequate ventilation.no sound on some orall channelsbusmatrix™ DiP switches are not in the correct positions. check your configuration worksheetand verify all settings.audio cable to the main bus inputs is bad. connect the non-working channel input to anothercable that is known to be good. Some or all of the internal amplifier fuses are blown. (returnthe amplifier to your dealer for service).hum from all thespeakershum may be caused by a ground loop between two components in the system. Test for aground loop by reversing the ac plugs of any components in the system with non polarized acplugs.check for faulty cables, faulty source material, an ungrounded phono system, cable TV feed ora defective component.amp will not turn onmaster 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 areblown. return the amplifier to your dealer for service.