APPENDIX
"Protect" shows in the display
The Receiver has thermal and
If the temperature increases further, the Receiver will go into a standby mode and "Protect" will appear in the display. When it cools sufÞciently, the Receiver will turn back on.
If the Receiver goes into protect mode often, check the following:
•Each speaker's average imped- ance is not less than 4 ohms.
•The Receiver has good ventilation, none of its vents are covered.
•Try setting all the speakers to Small, and let your subwoofers handle the heavy bass.
•Check that the ampliÞer power output is a good match for your speakers. If your speakers are inefÞcient, consider using an exter- nal power ampliÞer.
Reset procedure
The Receiver is a micro-
processor controlled device of great complexity. Occasional
power ßuctuations and spikes may cause the Receiver to "lock up" or act strangely. The Receiver can be reset as follows.
Warning: the Receiver will be reset to the factory defaults, and will clear all memory. All your stored OSD settings and Tuner presets will be erased.
•On page 57, write down your calibration settings, input settings, Tuner presets, and any other set- tings you have made.
•Press the power button to turn the unit off, or turn it off from the wall for a moment.
•Press and continue to hold down the front panel Power button and the Tone DOWN button at the same time.
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•The Receiver will power on and cycle through the display. Keep holding the buttons down until "Resetting to Factory Defaults" ap- pears in the front panel display
•When the Receiver has been re- set, it will shut off.
•Turn the Receiver back on and it will go to the default screen. It has now been reset.
•If the Receiver has to be reset regularly, you should invest in a good quality AC line conditioner.
Updating Þrmware problems
•See page 51
•If you have a Palm Pilot™ or simi- lar device with “HotSync™” or its equivalent, you may need to dis- able this software before proceed- ing. This software ‘seizes’ control of a serial port on your machine and prevents the SunÞre software from accessing that port. Use an- other port or disable HotSync.
•Check that the serial cable is connected correctly between the Receiver and your computer's se- rial port.
A Hum is heard in your speakers
This problem is more than likely caused by a “ground loop” in your system, rather than a fault in the Receiver. Follow these steps to isolate the main cause of the hum, there may even be more than one.
•Remember to turn off all compo- nents in your system, including the Receiver, before disconnecting or connecting any cables.
•Disconnect the following items in order, and check each time if the hum has gone away:
•Disconnect all cables which come from outside the room, such as cable TV, satellite TV, or roof top antennas. Make sure that they are disconnected where they Þrst enter the room, so they are making no connection to the Receiver 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 Receiver to your TV.
•Disconnect any component which has a grounded power cord.
•If the hum persists, disconnect all the source components one at a time from the back of the Receiver, until you identify the problem.
•Ground loop isolators are available for audio lines and video. Ask your SunÞre Dealer for assistance.
•Try moving the speaker cables away from any power cords. Try just one speaker, connecting it to different channels and see if an ampliÞer channel is bad.
•If you are still having a problem, remember that SunÞre’s dealers and technical support staff will as- sist you.
Other causes of noise
•Speaker noise may also be caused by interference or noise on your AC line. Make sure there are no large appliances sharing the line, or halogen lamps or
•Try connecting your system to an- other AC socket on a separate line.
•If the hum is heard from within the Receiver and not through the speakers, this may also be caused by interference on the AC or DC lines. The power transformers may turn this interference into an audible noise. Internal hum can be made worse by a shelf or cabinet resonating, so try moving the Re- ceiver to another shelf.
•Try moving your components further away from the TV, especially if you ever notice the screen has changed color in the area closest to the component.
•High efÞciency speakers may show up noises other speakers do not.
User's Manual