Disassembly of Capacitance Simulator Assembly

TM 55-4920-325-14&P

six capacitor assemblies C404 (10), C405 (11),

a. Tag, unsolder and remove resistor R118

C412 (12), C411 (13), C409 (14), and C408 (15)

(1) from teflon terminal (22) and transformer T101

from lower simulator chassis (28).

(6).

c. Remove two cross-recessed screws (16),

b. Tag, unsolder and remove resistor R119

two hex nuts ( 17) and detach three solder lugs

(2) from transformer T101 (6) and solder lug (5).

(18) and capacitor assembly C407 (19) from lower

c. Remove four hex nuts (3) and four lock-

simulator chassis (28).

washers (4) and detach solder lug (5) and trans-

d. Remove hex nut (20) and two insulating

former T101 (6) from mounting bracket (19).

washers (21 and 22) and detach connector J405

d. Remove two cross-recessed screws (7),

(23) from lower simulator chassis (28).

two hex nuts (8) and two Iockwashers (9) and de-

e. Remove hex nut (24) and washer (25) and

tach solder lug (10) and capacitor assembly C7

detach connector J404 (26) from lower simulator

(11) from mounting bracket (19).

chassis (28).

e. Tag, unsolder and remove resistor- R 1 1 6

f. Remove two bumpers (27) from lower sim-

(12) from two teflon terminals (22).

ulator chassis (28).

f. Tag, unsolder and remove capacitor C108

4-13. Cleaning.

(13) from potentiometer R120 (16) and teflon ter-

minal (22).

WARNING

g. Remove hex nut (14) and washer (15) and

Solvent (item 2, table 1-4) is toxic and

detach potentiometer R120 (16) from mounting

flammable. Use in well ventilated area.

bracket (19).

Avoid breathing of vapors and contact

with skin. Keep away from flames and

h. Remove four cross-recessed screws (17)

other ignition sources.

and four Iockwashers (18) to separate mounting

bracket (19) from mounting bracket (20).

Clean all parts, except electrical contacts, using

a clean, lint-free cloth moistened in ethyl alchohol

NOTE

(item 1, table 1-4). Remove stubborn deposits of

To replace capacitor assemblies C105I

dirt, grease and grime, using solvent (item 2, table

C106 (24), C103IC104 (25), or C101/

1-4) and a soft-bristled brush; dry using com-

C102 (26), refer test set to higher level

pressed air, 15 psi maximum. Clean electrical

of mairrtenance.

contacts using a dry, lint-free cloth.

i. Remove grommet (21) from mounting

4-14. Detailed Repair Instructions.

bracket (19).

Detailed repair of the test set consists of re-

j. Remove four teflon terminals (22) from

placing defective parts or assemblies. Refer to

mounting bracket (19).

paragraphs 4-8 through 4-12 and perform only

those steps of the disassembly procedures re-

4-12. Disassembly of Capacitance Simulator As-

quired to remove the defective component. The

sembly.

following paragraphs provide instructions for re-

To disassemble capacitance simulator assem-

assembly of the panel assembly, capacitance as-

bly, refer to figure 4-14 and proceed as follows:

sembly, bracket assembly and capacitance sim-

ulator assembly and repair of cable assembles.

NOTE

After all assemblies are reassembled, refer to

As disassembly proceeds, tag and dis-

paragraph 4-22 for reassembly of the test set.

connect wiring as required.

CAUTION

a. Remove six cross-recessed screws (1), six

As reassembly proceeds, do not strip

hex nuts (2) and detach six solder lugs (3) and

coax insulation or shielding mor e than

capacitor assemblies C403 (4), C406 (5) and C410

1/4" from solder connection. Be certain

(6) from lower simulator chassis (28).

shields are properly grounded. lm-

b. Remove 12 cross-recessed screws (7), 12

proper grounding will cause inaccurate

hex nuts (8) and 12 Iockwashers (9) and detach

CAPACITANCE INDICATOR readings.

4-21