D-2

D-2

MAINTENANCE

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WARNING

ELECTRIC SHOCK can kill.

• Have an electrician install and service this equipment.

Turn the input power off at the fuse box before working on equipment.

Do not touch electrically hot parts.

Prior to performing preventative maintenance, per- form the following capacitor discharge procedure to avoid electric shock.

INPUT FILTER CAPACITOR

DISCHARGE PROCEDURE

1.Turn off input power or disconnect input power lines.

2.Remove the 5/16 in. hex head screws from the side and top of the machine and remove wrap-around machine cover.

3.Be careful not to make contact with the capacitor terminals that are located on the top and bottom of the Power Board on the right side of the machine.

4.Obtain a high resistance and high wattage resistor (25-1000 ohms and 25 watts minimum). This resis- tor is not supplied with machine. NEVER USE A SHORTING STRAP FOR THIS PROCEDURE.

5.Locate the two capacitor terminals (large hex head cap screws) on the top and bottom of the Power Board shown in Figure D.1.

6.Use electrically insulated gloves and insulated pli- ers. Hold the body of the resistor and connect resistor leads across the two capacitor terminals. Hold the resistor in place for 10 seconds. DO NOT TOUCH CAPACITOR TERMINALS WITH YOUR BARE HANDS.

7.Repeat the discharge procedure for the other capacitor.

8.Check voltage across the terminals of all capaci- tors with a DC voltmeter. Polarity of capacitor ter- minals is marked on the Power Board above termi- nals. Voltage should be zero. If any voltage remains, repeat this capacitor discharge proce- dure.

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FIGURE D.1 — LOCATION OF INPUT FILTER CAPACITOR TERMINALS

POWER￿

UPPER ￿

BOARD

CAPACITOR TERMINALS

LOWER ￿

CAPACITOR ￿

TERMINALS

POWER￿

RESISTOR

RIGHT SIDE OF MACHINE

INSULATED￿

 

PLIERS

INSULATED￿

GLOVES

PRO-CUT 55

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Lincoln Electric SVM140-A service manual Input Filter Capacitor Discharge Procedure, Electric Shock can kill