Indicator Removal and Replacement

TM 11-7010-201-40-5/ET821-AA-MMI-050/E154 MTS/T O 31S5-2TSQ73-2-5

5-9. Indicator Removal and Replacement. (See figure 5-1.) Any of the 108 indicators (20) located on the MTS test aid

front panel (17) may be removed and replaced by performing the following procedures.

a. Removal. Perform the following procedure to remove an indicator (20).

(1) Loosen three knurled captive screws securing front panel (17) to chassis (1); open front panel (17).

(2) Tag wires to be removed. Using unwrapping tool (Gardner-Denver Model 515666-30 or equivalent), unwrap

and remove three wires from indicator (20).

(3) Remove nut and lockwasher securing indicator (20) to rear of front panel (17); remove indicator (20).

b. Replacement. Perform the following procedure to replace an indicator (20).

(1) Observing pin orientation, insert indicator (20) into front panel, and secure with nut and lockwasher.

NOTE

That portion of a wire termination that has been unwrapped shall not be used again. If there is sufficient

unused wire, as from a service loop, the wire may be cut, re-stripped and a new wrap termination made.

If not, replace the wire.

(2) Using wire wrap tool (Gardner-Denver Models 14B1, 14R, or equivalent, with bit number 507573 and sleeve

number 507100 or equivalent), wrap three wires on the appropriate indicator pins as tagged.

(3) Close front panel (17) and secure to chassis (1) with three knurled captive screws.

5-10. Rotary Switch Removal and Replacement. (See figure 5-1.) Rotary switch (23) located on the MTS test aid

front panel (17) may be removed and replaced by performing the following procedures.

a. Removal. Perform the following procedure to remove rotary switch (23).

(1) Loosen two set screws securing rotary switch knob (24) to rotary switch (23), and remove knob (24).

(2) Loosen three knurled captive screws securing front panel (17) to chassis (1), and open front panel (17).

(3) Tag, unsolder, and remove four wires attached to rotary switch (23).

(4) Remove nut and lockwasher securing rotary switch (23) to front panel (17), and remove rotary switch (23).

b. Replacement. Perform the following procedure to replace rotary switch (23).

(1) Install rotary switch (23) in front panel (17) and secure with nut and lockwasher. Ensure rotary switch guide pin

fits in front panel hole.

(2) Install and solder four wires as tagged.

5-8