Lincoln Electric IDEALARC SP-255 Service Manual page 77

F-24
TEST PROCEDURE
1. Disconnect main input power to the
machine.
2. Remove the Case Top and Side Pan-
els using the 5/16" nut driver.
3. Locate and disconnect Plug J2 con-
nected to the Control PC Board. See
Figure F.8.
J2 J2
J7
J4
J5
J6
FIGURE F.8 - Plug J2 Location on
G2801 PC Control Board.
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
b. If any of the resistance tests are
TROUBLESHOOTING & REPAIR
SP-255 KEYPAD RESISTANCE TEST
SP-255 CONTROL
G2801
J8
J9
J3
are taken from the pin locations
on Plug J2. See Figure F.9 for
each pin location.
not correct, the keypad may be
faulty. Replace.
IDEALARC
FIGURE F.9 - Plug J2 Test Points.
® SP-255
F-24