Directed Electronics 554A Instructions d'exploitation télécharger pdf (Page 42)

TM 11-6625-2611-12

CAUTION

Make sure ball plunger housing does not

scrape front panel when knob is rotated.

h. Insert flat-bladed screwdriver into hold in center

of knob and without disturbing position of knob, adjust

control until leading edge of first challenge pulse oc-

curs 0.2

µ sec after position referenced in d above.

i. Retighten setscrews.

j. Reconnect RF IN/OUT MAIN jack to LOW PWR

MEAS IN jack and check to see that first pulse is still

properly referenced at center of graticule then with

CHAL AUX MOD DLY control set at detent, check to

see that pulse of RF IN/OUT AUX jack is 0.2

µ sec

after pulse at RF IN/OUT MAIN jack.

5-9. Knob Replacement

All knobs are replaceable as part of organizational

maintenance. The following procedures are used for

replacing knobs.

a. Single Control Knobs (Except CHAL AUX MOD

DLY Knob).

(1) Loosen two setscrews and remove knob from

control shaft.

(2) Place replacement knob on shaft.

(3) Align pointer away from flat on control shaft

and tighten setscrew opposite pointer. Then tighten

other setscrew.

b. CHAL AUX MOD DLY knob replacement.

(1) Loosen two setscrews and remove knob and

ball plunger from control shaft.

(2) Install ball plunger into replacement knob.

(3) Install replacement knob on control shaft.

(4) Adjust control as described in paragraph 5-8.

c. Dual Knob Replacernent

(1) Loosen two setscrews of smaller knob.

(2) Remove smaller knob from control shaft.

(3) Loosen two setscrews of larger knob.

(4) Remove larger knob from control shaft.

(5) Install replacement for larger knob on control

shaft as described in a(2) and (3) above.

(6) Install replacement for smaller knob on con-

trol shaft as described in a (2) and (3) above.

5-2

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Directed Electronics 554A Instructions d'exploitation Page 42

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