Hi During the last week my T 743 have started to "freeze" and not responding to pushing the power on button. In the beginning it helped unplugging the power cable, but now it just wont start. Hope someone can tell me what to do.
Just had my t753 in bits... sounds like its overheating to me. Check that the fans on the bottom still turn and aren't clogged up with dust. Make sure that it has plenty of ventilation.
hmm, also try unplugging everything and leaving it on and see if it still freezes? ie check you're cabling is ok, there are no shorts from bare speaker wires etc...
Could try resetting it too? (in each case hold the buttons for 5 seconds then release) - Firmware version: hold video 6 and tone control - Reset DSP: video6 + tone defeat - Reset completely: video6 + right source button (this will wipe all settings - hold for 5 seconds, release and then unplug from the wall or turn off with the rear power switch)
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if everyting is frozen and you cannot do anything with your computer, you can wait a couple minutes to see if it is only working on something in the background that is taking up all its resources... if it does not start responding by itself, and you do not want to wait anymore... push the PC's start button that you use to turn your computer on (not the windows start button) for 8 seconds and it should turn off. NOTE: any changes to data that was open and and not saved will be lost.
They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.
A heat sink is just a finned heat-conducting device for radiating heat to the air which should be flowing freely through the unit's ventilation holes. It can't break in normal use. But it CAN get clogged with dust reducing its effectiveness.
Register and download the manual for free at retrevo.com
"Choose a location that is well ventilated (with at least several inches to both sides and behind), and that will provide a clear line of sight, within 25 feet/8 meters, between the receiver's front panel and your primary listening/viewing position-this will ensure reliable infrared remote control communications. The T 743 generates a modest amount of heat, but nothing that should trouble adjacent components. It is perfectly possible to stack the T 743 atop other components, but the reverse usually should be avoided. Nonetheless, it is generally preferable that the T 743 stand alone. It is especially important that sufficient ventilation be provided; if you are contemplating locating the T 743 within a cabinet or other furniture, consult your NAD audio/video specialist for advice on providing adequate airflow."
If you're lucky, you haven't finally toasted it. If you have, a hands on tech will need to sniff sround (literally) to find the dead component(s).
1: RESET: Go into the settings and scroll down to reset all, push center button, scroll to yes, push center this will restore factory settings..... 2: Reset All NOTE: THIS IS AN ADVANCED OPERATION AND RESTORES ALL SETTINGS TO THE FACTORY DEFAULTS. NORMAL USERS ARE NOT RECOMMENDED TO PERFORM THIS OPERATION! If your device freezes up press the Menu button and hold for 15 seconds. This is like a power down of the device. Once you perform the reset, the adjustments you made during last operation will be gone. This is what it states in the manual for the 260 sansa Page 29 3: Recovery Mode also resets system settings when unplugged... lock your sansa hold in the rec key on the left at the same time push the menu/power button this will take you to recovery mode then connect to the computer Start the update software
Start the sansa updater, set sansa to recovery mode plug into computer. unplug when told sansa should restart (Lock sansa press and hold rec and menu until recovery begins)
Also you can Try Reset All NOTE: THIS IS AN ADVANCED OPERATION AND RESTORES ALL SETTINGS TO THE FACTORY DEFAULTS. NORMAL USERS ARE NOT RECOMMENDED TO PERFORM THIS OPERATION! If your device freezes up press the Menu button and hold for 15 seconds. This is like a power down of the device. Once you perform the reset, the adjustments you made during last operation will be gone.....