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F-36F-36
PRECISION TIG 275
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TROUBLESHOOTING & REPAIR
ACTIVE SCR TEST (continued)
TEST PROCEDURE
1. Remove main supply power to the PRECI-
SION TIG 275 machine.
2. Locate and remove plug J4 from the control
board. See Figure F.7.
3. Perform the following test for all four SCRs.
See Figure F.8.
4. Construct the circuit outline in Figure F.8.
One 6V lantern battery can be used. Resistor
values are +\- 10%. The voltmeter scale
should be approximately 0-5 or 0-10 volts.
5. Battery Test
- Check the battery by shorting
leads (A) and (C) and then close switch SW-
1. Replace the battery if voltage is less than
4.5 volts.
Plug
J4
G3909
Figure F.7 - Plug J4 Location