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F-11

F-11

TROUBLESHOOTING & REPAIR

INPUT FILTER CAPACITOR DISCHARGE PROCEDURE (continued)

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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 mainte- nance, perform the following capacitor dis- charge procedure to avoid electric shock.

DISCHARGE PROCEDURE

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

2.Remove the 5/16" hex head screws from the wraparound machine cover.

3.Be careful not to make contact with the capacitor terminals located at the bottom of the Input Power Board.

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

5.Locate the four capacitor terminals (large hex head cap screws) shown in Figure F.1. At the bottom of the PowerBoard

(203,206)(207,202)

6.Use electrically insulated gloves and insu- lated pliers. Hold the body of the resistor and connect the 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 capacitor on the other two terminals.

8.Check the voltage across the terminals of all capacitors with a DC voltmeter. Polarity of the capacitor terminals is marked on the PC board above the terminals. Voltage should be zero. If any voltage remains, repeat this capacitor discharge procedure.

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FIGURE F.1 – LOCATION OF INPUT FILTER CAPACITOR TERMINALS

POWER

BOARD

CAPACITOR

TERMINALS

POWER

RESISTOR

RIGHT SIDE OF MACHINE

INSULATED

 

PLIERS

INSULATED

GLOVES

PRO-CUT 80

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Image 51
Lincoln Electric SVM146-A service manual Input Filter Capacitor Discharge Procedure

SVM146-A specifications

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