APPENDIX
Troubleshooting Guide
The SunÞre AmpliÞer is expertly designed and built to provide years of
The following information will help you deal with common setup problems you may experience during normal use of your unit. If the problems still persist, please contact your SunÞre Dealer for assistance.
No sound from one or more speakers
•Speaker cables may have come undone. Turn off your system and check the cables, and tighten the ampliÞer and speaker binding posts.
•Broken audio cable.
•The preampliÞer volume level is low for the channels concerned. Recheck the preampliÞer calibra- tion procedure.
•A preampliÞer Mute switch may be on, or an external processor loop or a tape monitor loop is engaged.
•Check that your preampliÞer or source is running the correct sur- round sound mode. Maybe it is set for stereo when you were expect- ing 5.1 surround sound.
•Check in case any missing chan- nels have been turned off in a preampliÞer setup menu. For example, the center ampliÞer channel will not receive a signal if the preampliÞer has been set to "Phantom."
•The Auto/on/off switch might be in the off position.
•One of the fuses for the current source outputs may have blown.
The ampliÞer shuts down often or the line fuse blows often
•Check that the positive and nega- tive speaker wires are not shorted together.
•Make sure that no speakers are shorted internally. If you have an
•If you have connected speakers in Parallel, the overall impedance may be too low. It is recommended that you rearrange the speakers in Series to increase the overall impedance, thus taking some of the load off the ampliÞer.
•Make sure that the ampliÞer has good ventilation and is not over- heating. Use the crystal base to al- low good airßow underneath. If the ampliÞer is in a closed rack, open up the rear panel or use a quiet fan for improved ventilation.
A hum is heard in your speakers
This problem is more than likely caused by a “ground loop” in your sys- tem, rather than a fault in the ampliÞer. Follow these steps to isolate the main cause of the hum; there may even be more than one.
•If your preampliÞer has XLR bal- anced outputs, use them because they offer greater immunity to noise Þelds.
•Remember to turn off all compo- nents in your system, including the ampliÞer, before disconnecting or connecting any cables during troubleshooting.
•Try to have all of your equipment on the same electrical outlet or circuit. Group all the low power components (preamp, CD player, DVD etc.) on a single outlet or power strip. This is provided that the overall current draw from your equipment does not exceed the rating of the outlet or breaker.
•Disconnect all cables which come from outside the room, and check if the hum goes away. This in- cludes such connections as cable TV, satellite TV, or roof top an- tennas. Make sure that they are disconnected where they Þrst enter the room, so they are making no connection to the preampliÞer or the TV, or any other component. If the hum is caused by the cable TV line, then you will need a “ground loop isolator.” This is an inexpen- sive device Þtted in line with the coaxial cable feed. Contact your cable company or your SunÞre Dealer for assistance.
•Disconnect all connections from the preampliÞer to your TV, VCR or DVD.
•As a test, disconnect any other component which has a grounded power cord.
NOTE: Never remove the ground pin from any power cords. This is very dangerous.
•If the hum persists, disconnect all the source components one at a time from the back of the preampli- Þer, until you identify the problem.
•Ground loop isolators are available for audio lines and video. You can ask your SunÞre Dealer for assis- tance.
•Try moving the speaker cables away from any power cords. Try just one speaker, connecting it to each ampliÞer channel and see if one channel is bad.
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User's Manual