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F-26F-26

TROUBLESHOOTING & REPAIR

SP-250 KEYPAD RESISTANCE TEST

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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.

 

SP-250 CONTROL

 

 

G2252

J2

 

 

 

 

J8

 

J7

 

 

J4

 

 

J9

J3

J5

J6

 

 

 

FIGURE F.8A - Plug J2 Location on

G2252 PC Control Board.

 

SP-250 CONTROL

 

G1992

 

J2

 

J8

 

J7

 

J4

J5

J9

 

J3

J6

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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FIGURE F.8B - Plug J2 Location on G1992 PC Control Board (Code 9402 only).

IDEALARC SP-250

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Lincoln Electric SP-250 Figure F.8A Plug J2 Location on G2252 PC Control Board, Figure F.9 Plug J2 Test Points