TROUBLESHOOTING & REPAIR
F-31
F-31
SQUARE WAVE TIG 275
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ACTIVE SCR TEST
(continued)
FIGURE F.7 – ACTIVE SCR TEST SETUP
R2
SW2
SW1
V
R1
6volt
Lantern
Battery
A
G
C
SCR
under
test
R1 = 4 ohms / 10 watts
R2 = 3 ohms / 10 watts
Resistor valves are ± 10%