Lincoln Electric SVM140-A service manual AIR/GAS Solenoid Test, Figure F.6 AIR Solenoid

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F-33 F-33

TROUBLESHOOTING & REPAIR

AIR/GAS SOLENOID TEST (continued)

FIGURE F.6 – AIR SOLENOID

AIR SOLENOID

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TEST PROCEDURE

1.Remove input power to the machine.

2.Perform the Input Capacitor Discharge Procedure detailed earlier in this section.

3.Locate the air solenoid and leads. See Figure F.6.

4.Carefully remove plug J31 from the output power board. See Figure F.7.

5.Check the coil resistance of the solenoid at plug J31 pin-6 to J31 pin-5. Normal resis- tance is approximately 20 ohms. If the resis- tance is abnormal, check the continuity (zero or very low resistance) of leads #366 and #361 between the solenoid and plug J31.

See the Wiring Diagram. If the leads are good, the solenoid coil may be faulty.

6.Carefully apply the 12 VDC supply to the solenoid leads at plug J31 (positive to J31 pin-6 lead #366 and negative to J31 pin-5 lead #361).

With proper air pressure applied, the sole- noid should activate and air should flow.

If the solenoid activates but air does not flow, check for a restriction in the air line.

7.Install plug J31 back into the output power board.

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FIGURE F.7 – PLUG J31 LOCATION

X4￿	B21
(B11)

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X2￿

(B12)

R5￿

Test￿

Point

G3326 - [ ] PRO-CUT 55 OUTPIUT

R5

B1

B2

J33

x40

x20

J31

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J32

PRO-CUT 55