Lincoln Electric LN-25 PRO DUAL POWER Service Manual page 73

F-23
PROCEDURE
To test either bridge rectifier (located on the back-
side of the front nameplate) follow the procedure
below.
1. Set your volt/ohm meter to check for continuity.
2. Make note of where the leads are currently on
the rectifier and then remove the leads to iso-
late the bridge rectifier for this test.
3. Verify values in the table and confirm the
expected results.
Positive Lead Negative Lead
Pin 1 Pins 2 or 4
Pins 2 or 4
Pins 2 or 4
Pin 3 Pins 2 or 4
Short = Low Ohm Value
Open = High Ohm Value
TROUBLESHOOTING AND REPAIR
BRIDGE RECTIFIER TEST (continued)
FIGURE F.8 – BRIDGE RECTIFIER
1
+
4
Expected Result
Open
Pin 1 Short
Pin 3 Open
Short
LN-25™ PRO DUAL POWER
2
-
3
4. If test results do not match the table, the Bridge
Rectifier may be faulty.
F-23