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TROUBLESHOOTING & REPAIR
F-40 F-40
LN-9 Wire Feeder
METER CIRCUIT ACCURACY TEST (continued)
Test Digital Meter Accuracy. (For LN-9 models
above code 7980 with separable digital meter and
meter boards only).
1. Use a test meter with at least 3-1/2 digits and
+/- .5% accuracy.
2. Connect the + probe to TP4 and the - probe to
lead #510C.
NOTE: The coating will have to be removed from
the test points.
3. With the meter in SET volts, adjust the voltage
control until the test meter matches the set-
tings in the table below.
If the LN-9 digital meter does not match the
readings, the LN-9 digital meter may be faulty.
Replace the digital meter.
LN-9 SET VOLTS READING TEST VOLTMETER READING
15.0 V .150 +/- .004 VDC
30.0 V .300 +/- .004 VDC
60.0 V .600 +/- .006 VDC
Test Meter PC Board Accuracy. (All Models)
1. Use a test meter with at least 3-1/2 digits and
+/- .5% accuracy.
2. Connect the + probe to leads #517 and the -
probe to lead #510C.
NOTE: The coating will have to be removed from
the test points.
3. With the meter in SET volts, adjust the voltage
control until the LN-9 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.
LN-9 SET VOLTS READING TEST VOLTMETER READING
15.0 V 1.50 +/- .05 VDC
30.0 V 3.00 +/- .05 VDC
60.0 V 6.00 +/- .07 VDC
Test Meter PC Board Accuracy. (For LN9-H,
LN-9FH Models Only)
1. Use a test meter with at least 3-1/2 digits and
+/- .5% accuracy.
2. Connect the + probe to lead #519 and the -
probe to lead #510C.
NOTE: The coating will have to be removed from
the test points.
3. With the meter in SET IN/MIN, adjust the
speed control until the LN-9 meter matches
the settings 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.
LN-9 SET IN/MIN READING TEST VOLTMETER READING
082 IPM 0.50 +/- .05 VDC
49 IPM 3.00 +/- .05 VDC
978 IPM 6.00 +/- .07 VDC