Removing Case And Measuring Input Capacitor Voltage - Miller Electric Welder Owner's Manual

5-3. Removing Case and Measuring Input Capacitor Voltage

Tools Needed:
5/16 in
+ lead to lower right
upper right terminal
OM-196 188 Page 26
Y Significant DC voltage can remain on capacitors af-
ter unit is Off. Always check the voltage as shown
to be sure the input capacitors have discharged be-
fore working on unit.
1
2
3
terminal, – lead to
1
Turn Off welding power source, and
disconnect input power.
1 Outside Handle Screws
To loosen top, remove two outside
handle screws from both handles
and all side bolts.
2 Interconnect Board PC2
3 Voltmeter
Measure the dc voltage across the
screw terminals on PC2 as shown
until voltage drops to near 0 (zero)
volts.
Proceed with job inside unit. Rein-
stall cover when finished.
Ref. 801 914 / Ref. 801 917