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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 maintenance, perform the following capacitor discharge procedure to avoid electric shock.
DISCHARGE PROCEDURE
1.Remove the input power to the machine.
2.Using the phillips head screwdriver remove the screws securing the case wraparound cover.
3.Be careful not to make contact with the capacitor solder pads located at the top of the IGBT power board.
4.Obtain a high resistance and high wattage resistor
5.Locate the eight capacitor solder pads shown in Figure F.3.
6.Using electrically insulated gloves and pliers, hold the body of the resistor with the pliers and con- nect the resistor leads across the two capacitor solder pads. Hold the resistor in place for 10 sec- onds. DO NOT TOUCH CAPACITOR SOLDER PADS WITH YOUR BARE HANDS.
7.Repeat the discharge procedure for the other three capacitors.
8.Check the voltage across the terminals of all capacitors with a DC voltmeter. Voltage should be zero. If any voltage remains, repeat this capacitor discharge procedure.
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FIGURE F.3 – LOCATION OF INPUT FILTER CAPACITOR TERMINALS ON MAIN IGBT INVERTER BOARD
Capacitor Solder
Resistor Pads