Niles Audio SI-1260 - Manual (Page 29)

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TROUBLESHOOTING GUIDE
Very low or no sound on
some or all channels.
Hum from all of the speakers.
Sound is distorted on one or
more channels at normal
volume.
No sound on any channels
and power LED is slowly
blinking.
Bass is weak and stereo
sound is "phasey".
A speaker connected to a
bridged pair of amplifier
channels sounds weak.
1. Bridging Switch is in wrong position. Check your con-
figuration worksheet for the correct setting and verify.
2. Audio cable to the input is bad. Connect a cable
known to be good to the non-working channel.
Hum can be caused due to a ground potential differ-
ence between connected components (especially those
connected to antenna or cable TV feeds).
1. Check for faulty cables; faulty source signals; an
ungrounded phono system, cable feed, and/or a
defective component.
2. Reverse the AC plug of components with non-polar-
ized plugs.
3. Test the AC receptacle using a Ground Tester.
1. DIP switch(es) are not in the correct position(s).
Check the worksheet and verify all settings.
2. If the channel pair LED is Yellow, then the channel is
being overdriven (volume set too high on the pream-
plifier). The channel volume level should be re-cali-
brated to avoid this condition (refer to page 25 for infor-
mation on Using Level Controls as Limiters).
Amplifier has an internal defect requiring service.
Contact your Niles dealer for service information.
1. Check that the Bridging Switch is "OFF". If two adja-
cent channels are connected normally but the bridg-
ing switch is set to the "BRIDGED" position, the two
speakers will be out of phase.
2. The speakers are wired out of phase. Recheck polar-
ity and reverse the connections on the back of one
speaker if necessary.
Check that the Bridging Switch is "ON".
POSSIBLE CAUSES AND TEST PROCEDURE SYMPTOM