REMOVAL AND REPLACEMENT OF ASSEMBLIES A2

T.O. 12P4-2APX-192

NAVAIR 16-35TS1843-1

TM 11-6625-1646-25

Table 8-6. In-Flight Test Mode Reply Evaluator (A3), Troubleshooting (See figure FO-4)

Test

Control Settings

Normal

If Indication

Step

Point

Equipment

and Instructions

Indication

Is Normal

If Indication Is Abnormal

Visual

Test set-up

Place RAD TEST-

Indicator

Proceed with

Check Q7-Q10, CR11,

(figure 7-1)

MON switch on

illumi-

routine

CR12 and associated

C-6280 in OUT

nates.

troubleshoot-

components. Replace

position. Place

ing pro-

defective component(s).

one of the MODE

cedures.

selector switches

in TEST position.

the assembly disengage from their receptacles. Carefully lift

8-9. REMOVAL AND REPLACEMENT OF ASSEMBLIES A2

assembly out of main frame assembly.

THROUGH A4 (See figure 8-7). Removal of assemblies A2

5. To remove top cover (6) remove six screws (7) and lock

through A4 requires the use of the two extraction tools

washers (8).

fabricated per instructions contained in section IV. Assemblies

6. If necessary to remove side covers (9), remove four each

A2 through A4 are held in place by channel guides cast into

screws (10), flat washers (11) and lock washers (12) attaching

the end plates of the main frame assembly and by contacts on

each cover to main frame assembly.

the bottom of the assemblies. These contacts attach to

7. To replace top and side covers, reverse procedures in

associated receptacles located on subassemblies A1A4A1

steps 4 and 5.

and A1A4A2. To remove and replace the covers and the

8. To replace assemblies A2 (3), A3 (4), and A4 (5), first insert

assemblies, perform the following procedures:

A4 (5) into proper channel guide, press simultaneously on both

1. Remove 11 screws (1, figure 8-7) attaching bottom cover

ends of A4 to ensure proper contact seating. Then insert A3

(2) to main frame. Note different screw lengths (three screws)

(4), then A2 (3), repeating above procedure.

(see figure 8-7).

2. To remove assembly A2, place the hook shaped end of one

CAUTION

extraction tool through the self-locking nut plate. Gently rock

and pull up on the extraction tool until contacts on the bottom

When replacing bottom cover, note that

of the assembly disengage from their receptacles. Carefully

three holes are always left open. These

lift assembly out of main frame assembly.

three holes will always be located on the

3. To remove assembly A3, hold two extraction tools with the

right side (viewed from adjustment end of

"L" shaped ends under the angle brackets as illustrated in

unit, see figure 8-7) of the bottom cover

figure 8-8 (A). Gently rock assembly back and forth while

regardless of the mounting direction desired.

pulling up until contacts on the bottom of the assembly

If a screw is forced into any of these

disengage from their receptacles. Carefully lift assembly out

mounting holes, damage to component parts

of main frame assembly.

mounted on the plug-in assemblies may

4. To remove assembly A4, hold two extraction tools with the

result.

tips of the hook shaped ends through the self-locking nut

plates as illustrated in figure 8-8 (B). Gently rock assembly

9. Replace bottom cover, inserting proper length screws in

back and forth while pulling up until contacts on the bottom of

applicable holes (see figure 8-7).

8-13