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F-13

F-13

TROUBLESHOOTING & REPAIR

CHOPPER BOARD CAPACITOR DISCHARGE PROCEDURE (continued)

FIGURE F.1 – CHOPPER BOARD CAPACITOR TERMINAL DISCHARGE

300 CHOPPER

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_ B1

C11 + B1

B2

_

B2

C10 +

C3

C2

C1 +

C4

C12 +

B4

B4 + C8

_

B5

B5

+ C9

B3

B6

_

B3 B6

J99

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PROCEDURE

WARNING

ELECTRIC SHOCK can kill.

High voltage is present when input power is applied to the machine.

Refer to Figure F.1.

1.Remove main input power supply to the machine.

2.Lift the hinged right side case cover.

3.Using the 3/8 in. nutdriver, remove the bottom right case cover.

4.Locate the Chopper Board with capacitors mount- ed on the center of the machine base, right side. See Figure F.1.

5.Using the resistor and jumper leads, CAREFULLY discharge the capacitor terminals. There are 5 capacitors. NEVER USE A SHORTING STRAP FOR THIS PURPOSE. DO NOT TOUCH THE TERMINALS WITH YOUR BARE HANDS.

To discharge the capacitors, hold the jumper leads to the following terminals for a minimum of 10 seconds each. See Figure F.1 and the Wiring Diagram.

Capacitors

Terminals

 

 

C10 and C11

B1 and B2

 

 

C5

B1 and B5

 

 

C8 and C9

B4 and B5

 

 

6.Using the volt/ohmmeter, check the voltage across terminals B1 and B2 and B1 and B5 and B4 and B5. Each reading should now be zero volts.

POWER MIG 300

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Image 57
Lincoln Electric SVM160-B service manual Chopper Board Capacitor Discharge Procedure, Capacitors Terminals

SVM160-B specifications

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