TM 9-4120-398-14
4-28. INTERNAL CONTROL BOARD (cont)
(a) Test for continuity between points L1-T1, L2-T2, L3-T3 while pressing in on center bar.
(b) If no continuity, replace defective motor starter.
(c) Test for continuity on micro switches, top and bottom leads.
NOTE
Center bar should not be depressed.
(d) If zero resistance replace defective motor starter.
(e) Depress center bar and microswitch should open or infinite resistance.