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OM-206 Page 19
ST-153 136-B
Turn Off welding power source and
disconnect input power.
Remove wrapper.
1 Input Capacitor C1 (Both
Models)
2 Input Capacitor C2 (175
Models Only)
3 Voltmeter
Check input capacitor(s).
Measure the dc voltage across the
positive (+) and negative (–)
terminals until voltage drops to near
0 (zero) volts.
Proceed with job inside unit.
Reinstall wrapper when finished.
1
2
3
Tools Needed:
5/16 in
Significant DC voltage can remain on capacitors after unit
is Off. Always check capacitors as shown to be sure they
have discharged before working on unit.
5-2. Measuring Input Capacitor Voltage