Troubleshooting and Repair

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F-43

FAN CONTROL AND MOTOR TEST (continued)

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7.If the 115VAC is low or not present check cir- cuit breaker CB2 located on the front panel. If the circuit breaker is OK, perform The Auxiliary Transformer Test. Check plug J22, circuit breaker CB2 and associated leads for loose or faulty connections. See the Wiring Diagram.

8.Energize the weld output terminals (Select Weld Terminals ON) and carefully check for 115VAC at plug J22 pin-1 to J22 pin-4 (fan leads). See Figure F.13. If the 115VAC is pre- sent and the fan is not running then the fan motor may be faulty. Also check the associat- ed leads between plug J22 and the fan motor for loose or faulty connections. See the Wiring Diagram. WARNING: HIGH VOLTAGE IS

PRESENT AT THE SWITCH BOARD.

9.If the 115VAC is NOT present in the previous step then proceed to the fan control test.

FAN CONTROL TEST PROCEDURE

1.Locate plug J20 on the switch board. Do not remove the plug from the switch board. See Figure F.12 and F.14.

2.Energize the weld output terminals (Select Weld Terminals ON) and carefully check for +15VDC at plug J20 pin-6+ to J20 pin-2- (leads 715 to 716). See Figure F.14. If the 15VDC is present and the fan is not running then the switch board may be faulty. If the 15VDC is not present when the weld terminals are energized then the control board may be faulty. Also check plugs J20, J7, and all asso- ciated leads for loose or faulty connections. See the Wiring Diagram.

WARNING: HIGH VOLTAGE IS PRESENT AT THE SWITCH BOARD.

3.Remove the input power to the V350-PRO.

Note: The fan motor may be accessed by the removal of the rear panel detailed in The

Current Transducer Removal and Replacement Procedure.

4.Replace the case wrap-around cover.

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FIGURE F.14 PLUG J20

Lead 716-

1	2	3	4
5	6	7	8

Lincoln Electric SVM158-A service manual Troubleshooting and Repair

Models: SVM158-A