Schumacher PI-1500 - Manual (Page 15)

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StAGe 2: The inverter then converts the 145-volts dC
into 110-volts AC (household voltage) using advanced
MOSFET transistors in a full bridge configuration. A "modi-
fied sine wave" waveform is generated by this conversion.
troubleshooting
PRoBLeM: Low or No output Voltage
Reason/Solution
1. Poor contact at terminals.
Unhook and rehook the 12-volt connections.
2. Using incorrect type of voltmeter to test output
voltage.
Use a true RMS reading meter.
PRoBLeM: Red LeD on
Reason/Solution
1. Battery voltage below 11 volts.
Recharge or replace battery.
2. equipment being operated is drawing too much
power.
Use a higher capacity inverter or do not use this
equipment.
3. Inverter is too hot (thermal shut down mode).
Allow inverter to cool. Check for adequate ventilation.
Reduce the load on the inverter to rated continuous
power output.