Lincoln Electric IDEALARC SP-250 Service Manual page 73

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TEST PROCEDURE
1. Disconnect main input power to the
machine.
2. Remove the Case Top and Side
Panels using the 5/16" nut driver.
3. Locate and disconnect Plug J2 con-
nected to the Control PC Board.
See Figures F.8A and F8B.
J2
J7
J4
J5
J6
FIGURE F.8A - Plug J2 Location on
G2252 PC Control Board.
J2
J7
J5
J3
FIGURE F.8B - Plug J2 Location on
G1992 PC Control Board (Code 9402
only).
TROUBLESHOOTING & REPAIR
SP-250 KEYPAD RESISTANCE TEST
SP-250 CONTROL
G2252
J8
J9
J3
SP-250 CONTROL
G1992
J8
J4
J9
J6
IDEALARC SP-250
4. Measure the resistance of each key
at Plug J2 using an analog volt-ohm
meter as described in Table F.1.
a. The resistance measurements
are taken from the pin locations
on Plug J2. See Figure F.9 for
each pin location.
b. If any of the resistance tests are
not correct, the keypad may be
faulty. Replace.
FIGURE F.9 - Plug J2 Test Points.
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