Lincoln Electric PRECISION TIG 275 SVM162-B - Manual (Page 83)

F-37 F-37
PRECISION TIG 275
TROUBLESHOOTING & REPAIR
ACTIVE SCR TEST (continued)
SW2
R2
R1
V
A
G
C
SCR
under
test
6 volt
lantern
battery
+
SW1
Figure F.8 - Active SCR Test Set-Up
R1 = 4 ohms / 10 watts
R2 = 3 ohms / 10 watts
Resistor values are +/- 10%
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