Marantz SR7200 - Manual (Page 37)

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ENGLISH GENERAL MALFUNCTION
If the equipment malfunctions, this may be because an electrostatic
discharge or AC line interference has corrupted the information in
the equipment memory circuits. Therefore:
- disconnect the plug from the AC line supply
- after waiting at least three minutes, reconnect the plug to the AC
line supply
- re-attempt to operate the equipment
Memory backup
• In case a power outage occurs or the power cord is
accidentally unplugged, the SR7200 is equipped with a
backup function to prevent memory data such as the preset
memory from being erased.
The memory functions are backed up for up to about one
week.
NOTE:
First of all keep SR7200 Standby or Powered-on more than 6
hours, to sufficient time for memory back up.