Lincoln Electric SVM138-A Service Manual page 107

F-43
METER CIRCUIT ACCURACY TEST (continued)
602
601
5. Test for AC supply to the meter PC board.
Check for 8 to 11 VAC from lead #601 to
#602. See Figure F.11.
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.11.
NOTE: The coating will have to be removed
from the test points.
TROUBLESHOOTING & REPAIR
FIGURE F.11 – METER PC BOARD TEST POINTS
TP5
TP4
510C
560
561
517
519
LN-9 GMA Wire Feeder
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.
F-43