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TROUBLESHOOTING & REPAIR
F-46 F-46
RANGER 300 D AND 300 DLX
This is NOT the typical CV output
voltage waveform. The capacitor
bank is not functioning. Note the
“ripple” in the waveform. The capac-
itor bank was disconnected to simu-
late an open or non-functioning
capacitor bank. Each vertical divi-
sion represents 50 volts and each
horizontal division represents 5 mil-
liseconds in time.
Note: Scope probes connected at
machine output terminals.
SCOPE SETTINGS
Volts/Div.....................50V/Div.
Horizontal Sweep.....5 ms/Div.
Coupling ............................DC
Trigger .........................Internal
ABNORMAL OPEN CIRCUIT WELD VOLTAGE WAVEFORM
(HIGH CV MODE)
HIGH IDLE – NO LOAD – OUTPUT CONTROL AT MAXIMUM
OUTPUT CAPACITOR BANK NOT FUNCTIONING
0 volts
5 ms
50 volts