Lincoln Electric 11519 Service Manual page 59

F-13
MAIN TRANSFORMER TEST (continued)
6. Connect main input power to the machine.
7. Turn the POWER MIG 255XT on/off power
switch to ON.
8. Carefully make the following voltage tests at
plug J6.
a. Turn the machine OFF between each test.
b. Carefully insert the meter probes into the
back of each Molex plug pin cavity to per-
form the test.
FROM
LEAD LEAD
X5
(6J6) (5J6)
X5
(6J6) (4J6)
X6
(5J6) (4J6)
9. Turn OFF the machine.
10. Locate the following leads on plug J5 on the
Control PC board. See Figure F.1.
LEAD
X8
X9
TROUBLESHOOTING AND REPAIR
TO EXPECTED
VOLTAGE
X6 15VAC
X7 30VAC
X7 15VAC
PLUG
LOCATION
16J5
8J5
Power MIG® 255XT
11. Turn the machine ON.
12. Make the following voltage tests at plug J5.
a. Turn the machine OFF between each test.
b. Carefully insert the meter probes into the
back of each Molex plug pin cavity to per-
form the test.
TO
FROM
LEAD LEAD
X9
X8
(16J5) (8J5)
c. If the voltage tested is incorrect, check for
loose or broken leads between the test
points and the main transformer.
d. If the voltage is not corrected, go to step
16.
13. Turn OFF the machine power.
F-13
EXPECTED
VOLTAGE
115VAC