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F-35

TROUBLESHOOTING & REPAIR

F-35

TYPICAL SCR GATE VOLTAGE WAVEFORM

0 VOLTS

2.00 V

5 ms

 

SCOPE SETTINGS

 

 

 

 

This is a typical SCR gate pulse voltage

 

 

waveform. The machine was in an open

Volts/Div

2.0 V/Div

circuit condition (no load) and operating

 

 

properly. Note that each vertical division

Horizontal Sweep

5 ms/Div

represents 2 volts and each horizontal

 

 

division represents 5 milliseconds in time.

Coupling

. . . . DC

NOTE: Scope probes connected at Plug J6

Trigger

. Internal

on the control board. The (+) probe to lead

 

 

G2, and the (-) probe to lead 204.

 

 

 

 

 

POWER MIG 255

Page 73
Image 73
Lincoln Electric SVM144-B service manual Typical SCR Gate Voltage Waveform