Section II. DISASSEMBLY/REMOVAL

TM 9-4931-378-13&P

Hz). The AADS reference signal is also converted to a de

two differential input receivers which condition data ready

peak level called the reference oscillator peak signal, A

and data inputs. Setting SELF TEST switch S5 on the front

single regulator and two buffer amplifiers produce the pre-

panel to SELF TEST inhibits the data clock and data trans-

cision +10 Vdc and -10 Vdc which can be monitored exter-

mit request outputs of CCA 1A2.

nally. The precision voltages are applied to divider networks

selected by front panel switches S7, S17 and S18. The pre-

h. Buffer and Oscillator CCA 1A3. The inputs to

cision voltages selected by the front panel switches are

CCA 1A3 consist of 5 Vdc, 15 Vdc, -15 Vdc and the re-

buffered on CCA 1A3. A precision resistance network,

solver signal. The ac resolver signal is converted to a dc peak

selected by front panel switch S6, provides simulated tem-

level called the resolver peak signal. An adjustable oscillator

perature inputs to the EPU.

circuit generates the AADS reference signal (380 to 420

Section II. DISASSEMBLY/REMOVAL

6-2. Test Set Disassembly (Figure 6-2). To disassemble

the test set, perform the following steps.

a. Open 8 cover latches (7).

b. Open cover (1) fully.

The resolver wires are fragile. Care must

c. Slide cover (1) sideways until hinge (2) and hinge

be taken to avoid damage to the wires

pins (3} disengage,

when handling the resolver.

Separate cover (1) from test set container (6).

Open storage compartment in cover (1) by releas-

Unsolder each resolver wire from

(b)

ing three button latches (8).

terminal block TB1 (77) and label

Remove cables, pneumatic tubing, pneumatic kit

for later identification.

and checking fixture from storage compartment in

(c)

Support resolver (30), loosen three

screws (28) and turn mounting

test set cover (1).

Remove twelve screws (5) that secure panel/chassis

clamps (26) until resolver (30) is

assembly (4) in enclosure (6).

free.

Lift panel/chassis assembly (4) out of enclosure

(d)

Remove

both

lower

mounting

(6) and place in upright position.

screws (32).

Remove each circuit card assembly 1A1 through

(e)

Support dual-speed drive (24) and

1A4 (1, figure 6-3) as follows:

remove

both upper mounting

(1) Loosen the screws (2) in both wedge

screws.

clamps on the appropriate circuit card

(f)

Move dual-speed drive (24) and

mounting ring (29) away from

assembly until clamps are loose.

front panel (22).

(2) Carefully extract the circuit card assem-

(2) R e m o v a l o f I n d i c a t o r L a m p .

bly (1) from the card rack assembly (3).

Remove

indicator lamp (2) as follows:

Remove lamp retainer (33).

6-3. Panel/Chassis Assembly-Wired, Disassembly. To dis-

(a)

(b) Extract lamp cartridge (34) from

assemble the panel/chassis perform the procedures outlined

Iampholder (35).

in paragraphs a and b.

Removal of Front Panel Mounted Components.

holder (35) and label for later

Remove front panel mounted components by per-

identification.

forming the following procedures:

(1) Removal of Dual-Speed Drive and Re-

(d) Remove retaining nut (37) and

sober. Remove dual-speed drive and re-

washer (36).

(e) Move lampholder (35) free of front

solver (1, figure 6-4) as follows:

Loosen two rear set screws (31).

panel (22).

(a)

6-5