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F-24TROUBLESHOOTING & REPAIRF-24

CHOPPER MODULE CAPACITOR DISCHARGE PROCEDURE (continued)

FIGURE F.2 – CHOPPER MODULE CAPACITOR TERMINAL DISCHARGE

INSULATEDPLIERS

B4

 

B1

B5

 

B6

B2

 

B3

INSULATED

GLOVES

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TEST PROCEDURE

1.

Turn the engine off.

2.

Perform the Case Cover Removal proce-

 

dure.

NOTE: It is necessary to remove the fuel cap in

order to take the case cover off the machine.

Be sure the fuel cap is ON when discharging

the chopper module capacitors.

3.

Locate the chopper module and capacitor

 

assembly on the inner machine baffle. See

 

Figure F.2 and the Wiring Diagram.

NEVER USE A SHORTING STRAP TO DIS- CHARGE CAPACITORS. If the Lincoln rec- ommended resistor, or an equivalent resistor is used, the capacitors can be discharged by holding the resistor with insulated pliers and using the resistor terminals to bridge Chopper Module terminals B1 to B2, and B4 to B5. DO NOT TOUCH THE TERMINALS OR METAL PARTS OF THE PLIERS WITH YOUR BARE HANDS. Hold the resistor in place for about 10 seconds.

If another type of resistor is used, jumper leads may need to be attached to the resis- tor. The leads can then be used to connect terminals B1 to B2, and B4 to B5.

4. Using the volt/ohmmeter, check the voltage across B1 and B2, then B4 and B5. It should be zero volts in both cases.

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RANGER 305D

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Lincoln Electric SVM175-A service manual Test Procedure, Perform the Case Cover Removal proce