Lincoln Electric SVM166-A service manual Leads 550

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F-20 TROUBLESHOOTING AND REPAIR F-20

DRIVE MOTOR TEST (Continued)

Figure F.6- Motor Leads

LEADS 550 & 551

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TEST PROCEDURE

1.Remove the input power to the LN-15.

2.Perform the Wire Drive Assembly

Removal procedure.

3.Locate the Positive lead 550 (white) and disconnect from motor. Note pin location for reassembly. See Figure F.6.

4.Locate the Negative lead 551 (gray) and disconnect from motor. Note pin location for reassembly. See Figure F.6.

5.Apply a variable DC voltage to the drive motor from lead 550(white)(+) to lead 551(gray)(-).

6.When the supply voltage is varied from 3 to 26 VDC, the drive motor speed (RPM) should vary accordingly. If the motor does not run or vary in speed, the motor, gearbox or motor brushes may be faulty. Check or replace.

7.Check the resistance between each of the motor leads and the motor case. The resistance should be very high (at least 500,000 ohms). If the resistance is low, the motor is grounded to the motor case and should be replaced.

LN-15