Sony STR-DH770 Manual page 86

Select the setting you want.
3
STBY ON: The receiver switches to standby mode after approximately 20 minutes.
STBY OFF
Note
This function does not work when [FM] is selected as the input.
If you use the AUTO STBY function and the sleep timer at the same time, the sleep timer has
priority.
[126] Adjusting Settings Reverting to the factory default settings
Reverting to the factory default settings
You can clear all memorized settings and restore the receiver to the factory default settings by
the following procedure. This procedure can also be used to initialize the receiver before you
use it for the first time.
Be sure to use the buttons on the receiver to perform this operation.
Turn off the receiver.
1
Hold down (power) on the receiver for 5 seconds.
2
[CLEARING] flashes on the display panel for a while, then changes to [CLEARED *].
Note
It takes a few minutes for the memory to be cleared completely. Do not turn the receiver off until
[CLEARED *] appears on the display panel.
[127] Troubleshooting Error messages
PROTECTOR
The receiver will automatically turn off after a few seconds. Check the followings:
There may be an electrical surge or power failure. Unplug the AC power cord (mains lead)
and then plug in the cord again after 30 minutes.
The receiver is covered and the ventilation holes are blocked. Remove the object covering
the ventilation holes of the receiver.
The impedance of the connected speakers is below the rated impedance range indicated on
the back panel of the receiver. Reduce the volume level.
Unplug the AC power cord (mains lead) and let the receiver cool down for 30 minutes while
performing the following troubleshooting:
Disconnect all of the speakers and subwoofer.
Check that the speaker wires are tightly twisted on both ends.
Connect the front speaker first, increase the volume level and operate the receiver for at
least 30 minutes until it completely warms up. Then, connect each additional speaker
one by one and test each additional speaker until you detect which speaker is causing
the protection error.