Maintenance - Lincoln Electric INVERTEC 160SX Service Manual

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 preventive maintenance, perform
the following capacitor discharge procedure to avoid
electric shock.
B
INPUT BOOST BOARD

MAINTENANCE

Figure 1
INPUT FILTER CAPACITOR
DISCHARGE PROCEDURE
1. Remove input power to Invertec
2. Remove the cover following the instruction
available in this Service manual.
3. Obtain a high resistance and high wattage resistor
( 500-1000 ohms and 25 watts minimum ). This
resistor is NOT supplied with the machine. NEVER
USE A SHORTING STRAP FOR THIS
PROCEDURE.
4. Remove the transparent plexiglass protection (A)
and the two insulating caps (B), See Figure 1
5. Locate, under the insulating caps, the two terminals
DC+ and DC – on the Input Boost Board. See
Figure 2
6. Use electrically insulate gloves and insulated
pliers, See Figure 2a. Hold the body of the resistor
and connect the resistor leads across the two
terminals. Hold the resistor in place for 10 seconds.
DO NOT TOUCH CAPACITOR TERMINALS
WITH YOUR BARE HANDS.
7. Check the voltage across the two terminals.
Voltage should be zero. If any voltage remains,
repeat this procedure.
A
Page8
®
160SX
Figure 2a
DC+
DC-
INPUT BOOST BOARD
Figure 2