Lincoln Electric SVM146-A service manual AIR/GAS Solenoid Test, Figure F.6 AIR Solenoid

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F-26 F-26

TROUBLESHOOTING & REPAIR

AIR/GAS SOLENOID TEST (continued)

FIGURE F.6 – AIR SOLENOID

TEST PROCEDURE

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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.

FIGURE F.7 – PLUG J31 LOCATION

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X4

(B12)

(B21)

X2

(B11)

TEST POINT

D29

		G3439 PRO-CUT 80 OUTPUT
		+
TEST POINT			C13
	D25	LED3
		LED5
				LED1
		LED4
		LED2

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J33

X20

X40 J31

J34 J32 J30

PRO-CUT 80