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Test Meter PC Board Wire Feed Speed Accuracy.
(Metric Models Only)
1. Use a test meter with at least 3-1/2 digits and
± 0.5% accuracy.
2. Connect the + probe to lead called for in the table
below and the - probe to lead #510C.
NOTE: The coating will have to be removed from the
test points.
3. With the meter in SET M/MIN, adjust the speed
control until the LN-9 GMA meter matches the set-
tings in the table below. If the test meter does not
match the readings, the meter PC board may be
faulty. Replace the meter PC board.
TROUBLESHOOTING & REPAIR
F-45 F-45
LN-9 GMA Wire Feeder
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METER CIRCUIT ACCURACY TEST (continued)
METRIC MODEL METRIC RANGE SET M/MIN READING TEST VOLTMETER
READING
LN-9 GMA or LN-9F GMA LO 8.28 LEAD #560
2.00 ± .05VDC
HI 24.8 LEAD #561
6.00 ± .07VDC