Specifications

CD-312
PRO WELD
17.0 TROUBLE SHOOTING – ELECTRICAL
When troubleshooting the power unit/controller (welder), the following precautions must be observed:
1. Welder must be TURNED OFF!
2. Unplug power cable from welder and wait at least two minutes before checking compo nents.
3. The use of a volt/ohmmeter is recommended where any voltage may be present.
4. Use a continuity tester ( or troubles hooting light) for continuity checks only.
5. Possible causes marked with a star (*) are generally the most common problems.
P ROBLEM POSSIBLE CAUSE CORRECTIVE ACTION
1. Welder does not turn on A. Power connections at Check connections.
and will not weld. Welder or 110 VAC outlet
not complete.
*B. Broken power cable or Check wires for continu ity.
loose wire connection in Repair break.
the plug.
C. Fuse blown. Replace fuse.
2. Fuse bl ows each time *A. Shorted weld capacitor. Check safety vent seal for
unit is turned on. Rupture hole. Replace
defective capacitor.
B. Shorted rectifier (BR1) Check for a short across the
rectifier with ohmmet er.
Replace rectifier module if
shorted.
C. Incorrect primary hookup. Check transformer connect ions.
D. Shorted transformer Replace transformer.
assembly.
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