Figure 7-5. Function switch assembly replacment.

TM 11-6625-2616-14

(2) Power and range switch replacement.

(a) Remove power cord from power out-

let, fuse holder, and top and bottom covers (a(1)

through a(3) above).

(b) Remove bottom shield (a(4) above).

(c) Remove bezel and front panel (a(6)

above) and turn the instrument so that it rests

on the top shield.

(d) Pull front plate away from chassis

(a(8) above).

(e) Insure that the PWR ON pushbutton

is in the "out" position (fig. 7-6).

Figure 7-5. Function switch assembly replacment.

(d) Pull front plate away from chassis

(a(8) above).

(e) With a sharp knife, cut silicon rubber

away from switch pins and wire sockets on top

of switch assembly (fig. 7-5).

(f) Remove wire sockets from switch

pins.

(g) Carefully cut away the silicon rubber

bonding the switch assembly to the circuit board

(fig. 7-5). The bonding material is located on

both sides and in the middle of the switch assem-

bly. Due to switch assembly pins inserted into

sockets in the circuit board, it is difficult to cut

all of the silicon rubber away. After most of the

material is cut free, use a screwdriver to care-

fully and evenly pry the switch assembly away

Figure 7-6. Power and range switch assembly replace-

ment.

from the circuit board, cutting the bonding mater-

ial as required.

(h) Trim all bonding material neatly back

(f) Carefully move the power switch rod

to the surface level of the plug-in sockets on the

(fig. 7-6) rearward and then lift the front of the

circuit board. Clean any bits of the material

rod upward away from the coupler on the front

from the sockets or around the switch mounting

switch. Move the rod forward and away from the

area with isopropyl alcohol.

rear power switch.

(i) Squeeze a moderate amount of 3144-

(g) Remove bonding material, remove

switch assembly, and install new switch ( (1)(g)

RTV silicon rubber on plug-in side of new switch

assembly. Do not allow bonding material to get

through (1)(j) above).

on the tip of the switch pins or to enter the

(3) Rear Power Switch Replacement. Refer

sockets. Evenly press switch assembly against

to figure 7-7 and perform the steps set forth in

circuit board until pins contact the bottom of the

(2)(a) through (2)(g) above.

sockets. Observe that the bonding material is in

i. Replacement of Minor Components.

contact with the surface of the circuit board.

(1) The minor components of the AN/GSiM-

(j) Allow 24 hours drying time before

operating the instrument.

64A (capacitors, resistors, etc.) are mounted on

7-5