Lincoln Electric SVM153-A service manual 40F-40, Control Circuit Input Power, J41

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F-40F-40

TROUBLESHOOTING & REPAIR

ANALOG POWER SUPPLY PC BOARD VOLTAGE TEST (CONTINUED)

FIGURE F.17 – ANALOG POWER SUPPLY PC BOARD

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CONTROL CIRCUIT INPUT POWER

13 1J41 to POS TERMINAL ON C2 - 85V SUPPLY

14 2J41 to NEG TERMINAL ON C2 - 85V SUPPLY

PCB2

ANALOG

J41 POWER PC BOARD

J42

3	1
4	2
J41

6 1

7 2 8 3 9 4 10 5

J42

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TEST PROCEDURE

1.Turn the engine off.

2.Perform the Case Cover Removal proce- dure.

3.Locate plugs J41 and J42 from the Analog Power Supply PC board. See Figure F.17.

4.Start the engine and run it at high idle (1900 RPM) with no load.

5.Check for the correct input voltage:

a.Set the volt/ohmmeter to the Volts DC position.

b.Place the negative probe on J41 pin 2 and the positive probe on J41 pin 1.

c.The reading should be between 75 and 85 VDC.

If the reading is not correct, the stator out- put may be incorrect, the rectifier output may be incorrect, the power capacitors may be faulty, or the Power Module PC board may be faulty. Perform the Stator Voltage Test, the Output Rectifier Bridge Test, and the Power Module PC Board Test. The capacitors C1, C2, C3 or C4 may be faulty. Test and replace if necessary.

6.Check for the correct output voltage read- ings per Table F.1. If any of the readings are not correct, the Analog Power Supply PC board may be faulty.

7.When finished testing, perform the Case Cover Replacement procedure.

COMMANDER 500