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6.Turn the POWER MIG 255C ON/OFF POWER SWITCH to ON.
7.Carefully make the following voltage tests:
a.Turn the machine OFF between each test.
b.Carefully connect the meter plugs to the exposed lead connections.
c.Turn the machine ON to conduct the voltage test at J5 connector Control board
FROM | TO | EXPECTED |
LEAD | LEAD | VOLTAGE |
|
|
|
208 | 206 | 28 VAC |
209 | 206 | 28 VAC |
|
|
|
8.If any of the AC voltages tested are incorrect or missing, check the leads and connections. See the wiring dia- gram.
9. Make the following voltage test:
a. Turn the machine OFF between each test.
b. Carefully connect the meter probes to the exposed lead connections.
c. Turn the machine ON to conduct the voltage test.
FROM | TO | EXPECTED |
LEAD | LEAD | VOLTAGE |
|
|
|
354 | 206 | 36 VDC |
|
|
|
10. If the DC voltage tested is incorrect or missing, and the AC voltages are cor- rect, the rectifier diode bridge may be faulty.
