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6.Connect main input power to the machine.
7.Turn the POWER MIG 255 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 perform the test.
FROM | TO | EXPECTED |
LEAD | LEAD | VOLTAGE |
|
|
|
X5 | X6 | 15VAC |
(6J6) | (5J6) |
|
X5 | X7 | 30VAC |
(6J6) | (4J6) |
|
X6 | X7 | 15VAC |
(5J6) | (4J6) |
|
|
|
|
9.Turn OFF the machine.
10.Locate the following leads on plug J5 on the G3521 control PC board. See
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 perform the test.
FROM | TO | EXPECTED |
LEAD | LEAD | VOLTAGE |
|
|
|
X8 | X9 | 115VAC |
(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.
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