Schumacher PI-70 - Manual (Page 5)

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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.
OPERATiNG iNSTRUCTiONS (MOdEL Pi-120) 5.
Plug the included power cable into the inverter. Note the plug 1.
will only fit into the outlet one way.
Push the 12-volt power plug firmly into the 12V accessory
2.
outlet. Note: In an airplane power outlet, the plug will only fit into
the outlet one way.
The LED indicator light should glow BLUE, verifying the inverter
3.
is receiving power. If the LED indicator is not on, read “LED
INDICATOR AND SHUTDOWN PROTECTION” section.
Make sure the device to be operated is turned OFF.
4.
Plug the device into the inverter AC outlet or USB outlet. 5.
Turn the device on. 6.
To disconnect, reverse the above procedure. 7.
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.
POWER SOURCE 6.
To get the best performance out of your inverter, we recommend that
you use it with the vehicle’s engine running.
Your average automobile or marine battery at full charge will provide
an ample power supply to the inverter for approximately 3 hours when
the engine is off. The actual length of time the inverter will function
depends on the age and condition of the battery and the power
demand being placed by the device being operated with the inverter.
If you decide to use the inverter while the engine is off, we recommend
you turn OFF the device plugged into the inverter and disconnect the
inverter’s plug from the 12-volt accessory outlet before starting the