Schumacher PI-400, Owner'S Manual

You can use an extension cord from the inverter to the 
appliance without significantly decreasing the power 
being generated by the inverter. For best operating 
results, the extension cord should be no longer than 50 
feet.

The LED Indicator briefly flashing when you first turn the 
inverter ON, is a sign if that there is a short circuit within 
the power supply.  Turn the inverter OFF.  Remove the 
12-volt plug from the cigarette lighter socket.  Firmly 
re-insert the plug.  Turn the inverter ON again.  If this 
does not remedy the problem try using a different 12-volt 
power source.

Using the Inverter to Operate a TV or Audio Appliance

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 recep-
tion.

Make sure the television antenna produces a clear signal 
under normal operating conditions (i.e., at home plugged 
into a standard 110 AC wall outlet). Also, ensure that the 
antenna cable is adequately shielded and of good quality.
Try altering the positions of the inverter, antenna cables, 
and television power cord.  Add an extension cord from 
the inverter to the TV so as to isolate its power cord and 
antenna cables from the 12-volt power source.
Try coiling the television power cord and the input cables 
running from the 12 -volt power source to the inverter.  

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