Lincoln Electric SVM192-A OUTPUT RECTIFIER BRIDGE TEST continued, Engine, F-24, Output Rectifier

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F-24 TROUBLESHOOTING AND REPAIR F-24

OUTPUT RECTIFIER BRIDGE TEST (continued)

FIGURE F.4 – LOCATION OF OUTPUT RECTIFIER LEADS

OUTPUT RECTIFIER

(-)

(+)

(-)

(+)

(-) (+)

ENGINE

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TEST PROCEDURE

1.Remove the spark plug wires to prevent acci- dental engine kickback or starting.

2.With the 5/16” nut driver, remove the 6 sheet metal screws from the case top.

3.Remove the rubber gasket (cover seal) from the lift bail.

4.Remove the fuel cap. The rubber gasket for the fill tube will come off with the case top.

5.Remove the case top, then replace the fuel cap.

6.With the 5/16” nut driver, remove the 5 screws holding the right case side.

7.Remove the right case side by lifting up and out.

8.Conduct the test with the gasoline engine OFF.

9.Locate the Output Rectifier Bridge behind the machine case front.

10.With the 7/16” wrench or socket wrench and 6” extension, remove the nuts and washers hold- ing the diode bridge pigtails and the heavy cur- rent-carrying leads to the studs located in the middle of the rectifier assembly. Note their locations and the order of fasteners for reassembly.

11.Electrically isolate the (-) diode connectors by slightly bending them back into “free air.”

12.With an ohmmeter or diode tester, check each of the four diodes from their connector to their respective heat sinks. See Figure F.4.

13.Reverse the tester leads and check the diodes again. Diodes should have a low resistance in one polarity and a very high resistance in the opposite polarity.

14.Replace any “shorted” or “open” diode bridge assembly the tests indicate.

15.Reconnect the diode connectors and heavy leads to their respective studs.

16.Reinstall the case side, case top, fuel cap, lift bail gasket and spark plug wires.

EAGLE™ 10,000