Troubleshooting & repair, Meter circuit accuracy test (continued) – Lincoln Electric LN-9 SVM127-A User Manual
Page 97
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TROUBLESHOOTING & REPAIR
F-39
F-39
LN-9 Wire Feeder
METER CIRCUIT ACCURACY TEST
(continued)
5.
Test for AC supply to the meter PC board.
Check for 8 to 11 VAC from lead #601 to
#602. See Figure F.10.
Note: The coating will have to be removed
from the test points.
6.
Test for DC volts on the meter PC board.
Check for 4.75 to 5.25 VDC from TP5 to lead
#510C. See Figure F.10.
NOTE: The coating will have to be removed
from the test points.
If the display is NOT lit and the correct DC volt-
age is present at TP5 to lead #510C, the digital
meter may be faulty. Replace the digital meter.
If AC voltage IS present at leads #601 to #602
and the DC voltage is missing, the meter PC
board may be faulty.
FIGURE F.10 – METER PC BOARD TEST POINTS
561
601
602
510C
517
560
TP5
TP4
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