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TROUBLESHOOTING AND REPAIR
F-33 F-33
RANGER® 3 PHASE
This is NOT the typical CV output volt-
age waveform. One output diode is
not functioning. Note the “gap” in the
waveform. One output diode was dis-
connected to simulate an open or non-
functioning output diode. Each vertical
division represents 20 volts and each
horizontal division represents 5 mil-
liseconds in time.
Note: Scope probes connected at
machine 115VAC receptacle.
SCOPE SETTINGS
Volts/Div.....................20V/Div.
Horizontal Sweep.....5 ms/Div.
Coupling.............................DC
Trigger.........................Internal
ABNORMAL OPEN CIRCUIT WELD VOLTAGE WAVEFORM (CV MODE)
HIGH IDLE - NO LOAD - OUTPUT CONTROL AT MAXIMUM
ONE OUTPUT DIODE NOT FUNCTIONING
CH1
0 volts
5 ms
20 volts
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