Lincoln Electric SVM154-A Service Manual page 69

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1 1
2 2
TEST PROCEDURE
1. Remove input power to the LN-10 unit.
2. Using the 5/16 in. nut driver, remove
the two screws from the top of the con-
trol panel. See Figure F.3.
3. Carefully lower the control panel.
4. Remove plug J11 from the display
board.
5. Perform the Display Board Removal
Procedure.
TROUBLESHOOTING AND REPAIR
KEYPAD RESISTANCE TEST (continued)
FIGURE F.3 — KEYPAD RESISTANCE TEST.
DISPLAY
BOARD
3 3 5 5 7 7 9 9
J10
4 4 6 6 8 8
J11
6. Check the keypad resistances referenc-
ing Figure F.3 and Table F.1.
7. The resistances are checked at plug
J10 on the keypad. See Figure F.3.
8. If any of the resistances are not correct,
the keypad may be faulty.
9. When test is complete, carefully install
the display board and connect plugs
J10 and J11.
10. Reassemble the front panel.
LN-10
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