Sony SRF-DR2000 - Manual (Page 6)

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Using External Power Sources
You can connect the following external power sources through
the DC IN 3 V jack located on the left side of the unit. (When
you plug a cord into the DC IN 3 V jack, the internal batteries
are automatically bypassed.)
• House current using a Sony AC-E30HG (not supplied) AC
power adaptor
• 12/24 V car battery using a Sony DCC-E230 (not supplied)
car battery cord
Notes
• When operating the unit with an external power source, do not
remove the batteries in the battery compartment which serve as a
backup of the memory.
• Use only the recommended AC power adaptor or car battery cord
manufactured by Sony. The polarity of the plugs of other
manufacturers may be different.
Polarity of the plug
When the radio turns off unexpectedly
When you set the Auto Power OFF function to ON, the radio
turns off automatically approximately after 120 minutes to
prevent unnecessary wear of the batteries. To listen to the
radio continuously, press POWER.
If the radio does not turn on after pressing POWER, or if the
radio turns off unrelated to the Auto Power OFF feature, the
batteries are exhausted.
Replace both batteries with new ones.
To set this function see “To set the Auto Power OFF” (page 21)
under “Setting the Functions” (page 20).