Lincoln Electric SVM138-A Service Manual page 108

F-44
METER CIRCUIT ACCURACY TEST (continued)
Test Digital Meter Accuracy. (For LN-9 GMA
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
± 0.5% 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 GMA digital meter does not match
the readings, the LN-9 GMA digital meter may
be faulty. Replace the digital meter.
LN-9 GMA SET
VOLTS READING
15.0 V
30.0 V
60.0 V
Test Meter PC Board Voltage Accuracy.
(All Models)
1. Use a test meter with at least 3-1/2 digits and
± 0.5% 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 GMA meter matches the
settings in the table below.
TROUBLESHOOTING & REPAIR
TEST VOLTMETER
READING
.150 ± .004 VDC
.300 ± .004 VDC
.600 ± .006 VDC
LN-9 GMA Wire Feeder
If the test meter does not match the readings, the
meter PC board may be faulty.
meter PC board.
LN-9 GMA SET
VOLTS READING
15.0 V
30.0 V
60.0 V
Test Meter PC Board Wire Feed Speed
Accuracy. (For LN-9 GMA, LN-9F GMA Models
Only)
1. Use a test meter with at least 3-1/2 digits and
± 0.5% 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 GMA 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 GMA SET
VOLTS READING
082 IPM
489 IPM
978 IPM
F-44
Replace the
TEST VOLTMETER
READING
1.50 ± .05 VDC
3.00 ± .05 VDC
6.00 ± .07 VDC
TEST VOLTMETER
READING
0.50 .05 VDC
±
3.00 ± .05 VDC
6.00 ± .07 VDC