Removal and Replacement of Electronic Signal A7DS1

TM 11-5895-1179-13 E132-EA-OMP-010/E106 KY883 TO 31S1-2GGSC-161

MODE select switch knob and the DECODER MODE select switch knob. Remove the knobs, nuts and

washers.

b. Release the four front panel assembly fasteners (figure 2-1), lower the front panel assembly and disconnect the

interconnect cable assembly A8A3 from connector A6A1J1 (figures 5-5, 5-3, and 5-7). Disconnect the

electronic signal connector assembly A8A2 from A6A1J2 (figures 5-5, 5-3, and 5-7).

c. Remove the five display and control circuit card assembly mounting screws, flat washers, lockwashers and

fiber washers (figure 5-3). Remove the two clamping block mounting screws, flat washers, and lockwashers

(figure 5-3). Remove the display and control circuit card assembly A6A1 from the front panel assembly A6.

d. Install the replacement display and control circuit card assembly and secure with the five screws, washers,

lock washers and fiberwashers removed in-step c. Install the clamping block with the two screws and

washers removed in step c. Connect the interconnect cable assembly A8A3 to connector A6AlJl and the

electronic signal connector assembly A8A2 to A6A1J2.

e. Close and secure the front panel assembly.

Replace the toggle switch washers and nuts removed in step A. Install the nuts and washers removed from

the FUNCTION select switch, the ENCODER MODE select switch, and the DECODER MODE select switch

in step a. Install the switch knobs and tighten the set screws (paragraph 4-6).

5-16.

Removal and Replacement of Electronic Signal A7DS1

Remove the chassis cover and the four plug-in-circuit card assemblies as described in paragraphs 5-6 and

4-7, respectively.

b. Disconnect the two leads from the terminals on the electronic signal A7DS1 (figure 5-5).

c. Unscrew the knurled mounting ring which secures the electronic signal to the mounting plate (figure 5-5) and

remove the electronic signal.

d. Position the replacement electronic signal on the mounting plate and install the knurled mounting ring.

Reconnect the two leads to the electronic signal removed in step h, making sure that the lead from A7TB2-5

(figure 5-2) is connected to the positive terminal on the electronic signal.

e. Install the four plug-in-circuit card assemblies (paragraph 4-7) and the chassis cover (paragraph 5-6).

Close and secure the front panel assembly.

5-17.

Removal and Replacement of Plug-In-Circuit Card Assembly Ejectors

a. Remove the appropriate plug-in-circuit card assembly (paragraph 4-7) and place the assembly component

side up, on a firm, flat surface that contains a hole or notch for the ejector pin to fall into when it is pushed

out.

5-19