Lincoln Electric INVERTEC V275-S Service Manual page 42

F-12
INPUT FILTER CAPACITOR DISCHARGE PROCEDURE (continued)
WARNING
ELECTRIC SHOCK
• 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 a 5/16" nut driver remove the screws secur-
ing the case wraparound cover.
3. Be careful not to make contact with the capacitor
terminals located at the top and bottom of the
switch board.
TROUBLESHOOTING & REPAIR
can kill.
FIGURE F.1 – Location of Input Filter Capacitor Terminals
CAPACITOR
TERMINALS
POWER
RESISTOR
4. Obtain a high resistance and high wattage resistor
(25-1000 ohms and 25 watts minimum).
resistor is not with the machine. NEVER USE A
SHORTING STRAP FOR THIS PROCEDURE.
5. Locate the four capacitor terminals shown in
Figure F.1.
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
terminals. Hold the resistor in place for 10 sec-
onds. DO NOT TOUCH CAPACITOR TERMINALS
WITH YOUR BARE HANDS.
7. Repeat the discharge procedure for the other
capacitor. (2 total)
8. Check the voltage across the terminals of both
capacitors with a DC voltmeter. Voltage should be
zero. If any voltage remains, repeat this capacitor
discharge procedure.
FOUR
V275-S
F-12
This
INSULATED
PLIERS
INSULATED
GLOVES