Pioneer HTP-073 - Manual (Page 19)

Basic setup
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Chapter 3:
Basic setup
Canceling the Auto Power Down
When this receiver is not used over a period of several hours,
it will power down automatically. The automatic power-off
timer is set to six hours under factory settings, and the timing
can be changed or the power-off function switched off
altogether. For details, see The Auto Power Down menu on
page 32.