TM 11-6625-3053-14
c.
Reset power set drive system as follows:
(1)
Loosen set screws on drive gear which drives attenuator hairline gear.
(2)
Rotate drive gear until leading edge of probe drive yoke is flush with mounting block.
(3)
Loosen 2 set screws on cursor gear hub to allow cursor to move freely.
(4)
Position attenuator dial with any convenient number dead center as a reference.
(5) Rotate hairline gear to a position 24 dB left of the center reference. Tighten cursor gear screws
provisionally.
(6) Rotate power set drive shaft clockwise until all stops make contact and shaft stops.
(7) Tighten screws on power set drive gear.
(8) Install power set probe per separate replacement procedure (para 6-34). Move klystron cavity forward
or backward slightly, if necessary, to aline probe with probe tube. Tighten oscillator cylinder screws
when alined.
d. Reset attenuator drive system as follows:
(1) Rotate attenuator dial counterclockwise until probe drive yoke bottoms out on probe pipe.
(2) Set power set control fully clockwise (hairline fully counterclockwise).
(3) Loosen attenuator dial and adjust so that 0 on the dial falls under the hairline.
(4) Tighten attenuator dial set screws.
(5) Rotate the attenuator drive shaft fully clockwise until it stops.
(6) Tighten attenuator drive gear.
(7) Install attenuator probe per separate replacement procedure (para 6-35).
6-37.
REPLACEMENT OF A5 LEVELING ATTENUATOR ASSEMBLY.
REMOVAL
a. Remove instrument dust cover (para 6-20).
b. Note connections and dressing of cables and wires attached to J1, J2, J3, J4, El, and E2 and the detector
mounted on the A5 assy.
c.
Remove 2 nuts on top of saddle holding the detector to A5 assy.
d. Remove top saddle yoke and dress detector and move cabling out of the way.
e. Remove round head phillips screw attaching bracket on which saddle is mounted to top of A5 assy. Remove
bracket holding saddle from A5 assy.
f.
Remove from underside of main frame 4 flat head screws holding A5 assy to main frame.
g. Extract A5 assy from fixed position to gain access to connections.
h. Remove cables attached to J1, J2, J3 and J4.
i.
Unsolder center conductor and black grounding wire from El and E2.
NOTE
Be careful not to harm or lose the ferrite bead on center conductor of each
shielded lead. Be sure to position properly when performing replacement
procedure.
6-95