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POWER MIG 255
TROUBLESHOOTING & REPAIR
F-35 F-35
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0 VOLTS
2.00 V 5 ms
TYPICAL SCR GATE VOLTAGE WAVEFORM
This is a typical SCR gate pulse voltage
waveform. The machine was in an open
circuit condition (no load) and operating
properly. Note that each vertical division
represents 2 volts and each horizontal
division represents 5 milliseconds in time.
NOTE: Scope probes connected at Plug J6
on the control board. The (+) probe to lead
G2, and the (-) probe to lead 204.
Volts/Div . . . . . . . . . . . . . . . . . . 2.0 V/Div
Horizontal Sweep . . . . . . . . . . 5 ms/Div
Coupling . . . . . . . . . . . . . . . . . . . . . . DC
Trigger . . . . . . . . . . . . . . . . . . . . Internal
SCOPE SETTINGS