TM 9-4910-663-34
(18)
Reverse the procedures of steps (1) through (17) to assemble the SPEED CONTROL components after
replacing defective parts.
c. Testing Current Transformers CT1, CT2, and CT3.
(1)
Disconnect main power from the test stand.
(2)
Remove 10 1/4-20 screws and lockwashers that attach the right side panel to the test stand, and remove
the right side panel.
(3)
Disconnect the three leads of each control transformer from the terminal block.
(4)
Using an ohmmeter, measure the resistance between the white (center) lead of each control transformer,
and each of the end (black) leads of that control transformer. The ohmmeter indication should be essentially zero ohm.
If an open circuit or high resistance is indicated, replace the current transformer.
d. Removal and Replacement of Current Transformer CT1, CT2, or CT3.
(1)
Disconnect main power from the test stand.
(2)
Remove the panel retaining hardware from the front and sides of the control panel, raise the control panel,
and secure it in the up position with the lock bolt.
(3)
Remove the 10 1/4-20 screws and lockwashers that attach the right side access panel to the test stand,
and remove the right side access panel.
(4)
Disconnect the three leads of the current transformer that is to be replaced from the terminal block.
(5)
Disconnect the power cable associated with the current transformer that is to be removed from the
ALTERNATOR T1, T2, or T3 binding post on the binding post panel assembly (fig 2-6) by removing the attaching nut and
lockwasher at the rear of the binding post.
(6)
Remove the retaining hardware of the current transformer that is to be replaced.
(7)
Slide the current transformer along the power cable to the free end of the power cable, cutting and
removing cable ties as necessary, and remove the current transformer.
(8)
Reverse the procedures of steps (1) through (7) to install the replacement current transformer. Install new
cable ties as required.
e. Testing Starter Coil Resistor R1.
Change 1 3-21
