Testing. Use a multimeter and test the rheostat and the direct cur-
rent resistance element for smooth operation through out the range.
Test the rheostat for resistance of 121.5 plus or minus 5 percent.
Replace a defective rheostat.
Wipe clean using a lint-tree rag.
Refer to schematic wiring diagrams.
Disassemble the control cabinet as illustrated in fig-
ures 18-7, 18-8, and 18-9.
Assemble the control cabinet as illustrated in figures