TM9-4120-370-14
TO35E9-229-1
Preliminary procedure:
Pull safety control box out far enough to gain access to panel mounting screws.
(See para 4-65.)
Inspection/Test
a.
(1)
Check to see that power has been disconnected.
(2)
Using screwdriver, remove four flat head screws from safety control box panel.
Carefully pull panel from safety control box far enough to gain access to circuit breaker terminal connec-
(3)
tions.
(4)
Check that wire leads are properly connected. (See wiring diagram Figure 4-20.)
Check circuit breakers for signs of overheating or other visible damage.
(5)
Set circuit breaker reset bars In OFF position.
(6)
(7)
Use Multimeter set on lowest OHMS scale to check continuity between terminals Al and A2 on circuit
breaker CB3 and terminals A1 and A2 and B1 and B2 on circuit breaker CB2. All contacts should be open.
If there is continuity on any check, replace circuit breaker(s).
Press reset bars toward the OFF stop, then place them in the ON position.
(8)
Use a Multimeter set on the lowest OHMS scale and repeat continuity checks between terminals Al and
(9)
A2 on circuit breaker CB3 and terminals A1 and A2 and B1 and B2 on circuit breaker CB2. All contacts
should be closed. If there is no continuity on any check, replace circuit breaker(s).
