Schumacher PID-760 Owner's Manual page 7

8. To disconnect, reverse the above procedure.
9. Press and hold the ON/OFF switch to turn the inverter off.
NOTE: If more than one device is to be powered, start one device at a time to
avoid a power surge and overloading the inverter. The surge load of each device
should not exceed the inverter's Continuous Operation wattage rate.
CAUTION: If there is a short circuit or power surge in the device,  will display
and the alarm will sound. Press the ON/OFF switch to turn off the alarm. If the 
displays after several attempts, there is a short circuit or the device requires more
"starting" or "peak" load than the inverter is capable of providing.
USING THE USB PORT
The USB port provides up to 2.0A at 5V DC.
1. Plug the device into the USB port.
2. Press and hold the ON/OFF switch to turn the inverter on. (The internal
speaker will make a brief "beep". This is normal.)
3. Turn the USB device on.
4. Reverse these steps when finished using the USB port.
USING THE INVERTER TO OPERATE A TV OR AUDIO DEVICE:
The inverter is shielded and filtered to minimize signal interference. Despite this,
some interference may occur with your television picture, especially with weak
signals. Below are some suggestions to try and improve reception.
1. Try altering the position of the inverter, antenna cables, and television
power cord. Add an extension cord from the inverter to the TV, to isolate its
power cord and antenna cables from the 12 volt power source.
2. Try coiling the television power cord and the input cables running from the
12 volt power source to the inverter.
3. Affix one or several "Ferrite Data Line Filters" to the television power cord.
Ferrite Data Line Filters can be purchased at most electronic supply stores.
4. Try grounding the inverter with an 18 AWG (minimum) wire, using as short
a length as possible.
NOTE: You may hear a "buzzing" sound being emitted from inexpensive
sound systems when operated with the inverter. This is due to ineffective filters
in the sound system's power supply. Unfortunately, this problem can only be
resolved by purchasing a sound system with a higher quality power supply or
higher quality filter.
WARNING: The inverter draws power, even when the switch is OFF.
To avoid battery drain, disconnect the inverter when not in use.
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