Lincoln Electric 11519 Service Manual page 60

F-14
MAIN TRANSFORMER TEST (continued)
14. Locate the following leads on plug J5 on the
Control PC board. See Figure F.1.
LEAD
206
LEAD
208
209
15. Turn the machine ON.
16. Make the following voltage tests at plug J5 on
the Control PC board.
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.
c. If any of the voltages tested are incorrect,
check for loose or broken leads between
the test points and the main transformer.
FROM
LEAD
208
(2J5)
208
(2J5)
209
(1J5)
TROUBLESHOOTING AND REPAIR
PLUG
LOCATION
3J5
PLUG
LOCATION
2J5
1J5
TO EXPECTED
LEAD VOLTAGE
209 56VAC
(1J5)
206 28VAC
206 28VAC
Power MIG® 255XT
17. Test for correct nameplate input voltage
between the H1 lead at the ON/OFF POWER
SWITCH to H2 or H3 (H5 if connected for 575
VAC) at the reconnect panel. Voltage tested
will vary depending on input voltage connec-
tion. See Wiring Diagram for test point loca-
tions.
a. If the voltage test is incorrect,
- Check for loose or broken leads between
the reconnect panel and the ON/OFF
POWER SWITCH.
- Test the ON/OFF POWER SWITCH for
proper operation.
b. If the correct nameplate voltage is being
applied to the main transformer and one or
more of the secondary voltages are miss-
ing or are incorrect, the main transformer
may be faulty. Replace.
F-14