Typical scr gate voltage waveform, F-35, Troubleshooting and repair – Lincoln Electric POWER MIG SVM170-A User Manual
Page 75
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F-35
TROUBLESHOOTING AND REPAIR
POWER MIG 255C
F-35
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
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