Lincoln Electric LF-72/74 service manual Figure D.1

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D-3	MAINTENANCE	D-3
	FIGURE D.1

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4.Open the idle arm.

5.Turn power on to the LF-72.

6.Adjust the WFS knob to 300 ipm. Center the knob pointer with the name plate graphics.Activate the gun trigger.

7.Insert the shorting plug into connector J2 on the p.c. board. The shorting plug shorts pins 1 & 5.

(See Figure D.2)

8.Remove the shorting plug. Set aside.

(For Codes below 11289 use 9 thru 17)

9.Adjust the WFS knob to minimum.

10.Insert the shorting plug into connector J2.

11.Adjust the WFS knob until the motor measures 51

±5.5 ipm. (9.5 ± 1.0 rpm).

12.Remove the shorting plug.

13.Adjust the WFS knob to maximum.

14.Insert the shorting plug into connector J2.

15.Adjust the WFS until the motor measures 793 ± 5.5 ipm (146.7 ± 1.0 rpm.)

16.Remove the shorting plug.

17.Release the gun trigger.

(For Codes above 11290 use 18)

18.Replace P2 from the harness into connector J2.

19.Turn off power.

20.Secure the wraparound to the LF-72 with 5 screws.

FIGURE D.2

J2 CONNECTOR

LF-72/74 SINGLE/DUAL