Figure f.4, Troubleshooting & repair, Voltage board transformer test – Lincoln Electric NA-5S User Manual
Page 100
F-47
TROUBLESHOOTING & REPAIR
F-47
7. Using the 115VAC supply carefully
apply 115VAC to pins #8 and #9 in
the nine pin molex plug cavity on the
voltage board. See Figure F.4
Make sure the board and leads are
insulated from each other and any
metal conductors.
8. Using the voltmeter check for
approximately 24VAC at the sec-
ondary test points. See Figure F.4
Note: The secondary voltage will vary
with the input primary voltage. The
insulating material will have to be
removed from the secondary test
points to insure that the meter probes
make good electrical contact.
9. If the secondary voltage is correct
the transformer is functioning proper-
ly.
10. If the secondary voltage is low or
not present the transformer may be
faulty.
11. Carefully remove the 115VAC sup-
ply from the voltage board.
12. Install the voltage board and con-
nect the molex plugs.
13. Close and secure the access door.
VOLTAGE BOARD TRANSFORMER TEST
(Continued)
NA-5
FIGURE F.4 TRANSFORMER TEST POINTS
NA-5
VOL
T
AGE
G1556-[ ]
VOLTAGE BOARD
TRANSFORMER
PIN #8
PIN #9
24VAC
SECONDARY
TEST POINTS
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