Lincoln Electric IDEALARC SP-255 Service Manual page 85

F-32
OUTPUT CAPACITOR BANK NOT FUNCTIONING
This is NOT the typical DC output voltage
waveform. The output capacitors are not
functioning. Note the lack of "filtering" in the
output waveform. The output capacitor bank
was disconnected. Each vertical division
represents 20 volts and each horizontal divi-
sion represents 5 milliseconds in time.
Note: Scope probes connected at machine
output terminals: (+) probe to electrode, (-)
probe to work.
TROUBLESHOOTING & REPAIR
ABNORMAL OPEN CIRCUIT VOLTAGE
IDEALARC
SCOPE SETTINGS
Volts/Div . . . . . . . . . . . . . . . . . .20 V/Div.
Horizontal Sweep . . . . . . . . . .5 ms/Div.
Coupling . . . . . . . . . . . . . . . . . . . . . .DC.
Trigger . . . . . . . . . . . . . . . . . . . .Internal.
® SP-255
F-32