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F-21F-21
PRECISION TIG 275
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TROUBLESHOOTING & REPAIR
AMMETER CALIBRATION PROCEDURE
1. Locate the Ammeter Calibration Trimmer (R5). See
Figure F.1.
2. Set to TIG mode with DC polarity and LOCAL con-
trol. Without closing the arc start switch, preset the
maximum output panel control so the panel digital
meter reads approx. 200 amps.
3. Using a DC (AVG.) test ammeter with at least 1%
accuracy at up to 300 amps, connect it to measure
the DC current through a short weld cable shorting
out the work(+) to electrode(-) studs on the front stud
panel. Remove the TIG torch if connected.
4. Close the arc start switch just long enough to com-
pare the panel meter reading to that of the test
ammeter. The short circuit current readings should
match within 4% +/-2A. If not, adjust the trimmer so
that the panel meter accuracy is corrected.
VOLTMETER CALIBRATION PROCEDURE
1. Locate the Voltmeter Calibration Trimmer (R2) on
the control board. See Figure F1.
2. To prevent maximum OCV output, disconnect the
SCR gate lead plug from receptacle J4.
3. Set to TIG mode with DC- polarity without closing the
arc start switch.
4. Using a DC (avg.) test voltmeter with at least 1%
accuracy at up to 100 volts, connect it across the
work (+) and electrode (-) studs on the front stud
panel. Remove the TIG torch, if connected.
5. Press the display panel switch to V (volts) position,
then close the arc start switch just long enough to
compare the panel meter reading to that of the test
volt meter. The open circuit voltage readings (about
50 VDC) should match within 3% +/-1v. If not, adjust
the trimmer so that the panel meter accuracy is cor-
rected.
NOTE: If the Arc Start switch is held closed longer than
about 15 seconds, the machine will shut down
to protect internal holding resistor from over-
heating.
METER CALIBRATION ADJUSTMENTS (continued)
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R-5
R-2
FIGURE F.2 - CONTROL BOARD TRIMMERS