Lincoln Electric IDEALARC DC-1500 Service Manual page 90

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SCR OUTPUT BRIDGE REPLACEMENT (continued)
PRE-ASSEMBLY OF RECTIFIERS
L5348-4 Rectifier
1. Remove the steel vertical baffle from the
removed rectifier and mount to a new -4 rectifi-
er.
2. Remove the bottom fiber baffle from the
removed rectifier and mount to a new -4 rectifi-
er. Note: The location of the notch in the baffle
must be positioned correctly.
3. Remove the L6981-1 snubber p.c. board from
the removed rectifier and mount to a new -4 rec-
tifier.
4. Disconnect the red and white SCR leads from
the terminal strip. Remove the terminal strip and
number plate from the removed rectifier and
mount to a new -4 rectifier. Connect the red lead
on top and the white lead on the bottom of the
terminal strip.
5. Apply E1868 Joint Compound on the heat sink
surfaces (2 places) where the aluminum sec-
ondary leads connect.
L5348-5 Rectifier
1. Disconnect the red and white SCR leads from
the terminal strip. Remove the terminal strip and
number plate from the removed rectifier and
mount to a new -5 rectifier. Connect the red lead
on top and the white lead on the bottom of the
terminal strip.
2. Apply E1868 Joint Compound on the heat sink
surfaces (2 places) where the aluminum sec-
ondary leads connect.
TROUBLESHOOTING AND REPAIR
IDEALARC® DC-1500
L5348-6 Rectifier
1. Remove the steel vertical baffle from the
removed rectifier and mount to a new -6 rectifi-
er.
2. Remove the bottom fiber baffle from the
removed rectifier and mount to a new -6 rectifi-
er.
3. Remove the L6980-1 snubber p.c. board from
the removed rectifier and mount to a new -6 rec-
tifier.
4. Disconnect the red and white SCR leads from
the terminal strip. Remove the terminal strip and
number plate from the removed rectifier and
mount to a new -4 rectifier. Connect the red lead
on top and the white lead on the bottom of the
terminal strip.
5. Apply E1868 Joint Compound on the heat sink
surfaces (2 places) where the aluminum sec-
ondary leads connect.
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