TM 9-4935-294-15/2
1-Cover, side-7923028
2-Screw, machine, flat-counter-sunk hd, no. 6-82, 3/8
21-Washer, lock, split, helical, no. 6-MS8538-41
in. Ig, UNC-2A-MS35190-236
22-Washer, flat-MS27183-5
3-Bracket assy, connector-7928061-4
23-PC board assy, shaping network-7923067-7
4-Screw,machine,I.atcounter-sunk hd, no. 62, 7/16 in.
24-Screw, machine, pan hd, no. 4-40, 1/4 in. Ig,
Ig, UNC-2A-MS38619287
UNC-2A-MS5206-218
5-Tube,BWO,K-band-7923112
25-Washer, flat-MS27183-3
6-Nut, plain, hex, machine screw, no. 4406, UNC-2B-
26-Handle,bow,brass,nickel plated-MS39087-5
MS35649-242
27-Screw, machine, pan hd, no. 10-32, 1/2 in. Ig,
7-Washer, lock, split, helical no. 2-MS85388-40
UNF-2A-MS35207-263
8-Screw, machine, pan hd, no. 4-40, /4 in. Ig, 'UNC-
28-Washer, lock, split, helical, no. 10-MSs5338-43
2A-MS865i206-219
29-Ferrule-10519306
9Screw, machine, pan hd, no. 4-40, 9/8 in. lg, UNC-
30--Panel, front7923096-1
2A-MS85206-218
31-Nut, plain, hex, machine screw, no. 10-24, UNC-
10-Screw, machine, pan hd, no. 10-82, 8/8 in. Ig,
2B-MS356649-104
UNF-2A-MS519U8-61
32-Washer, lock, split, helical, no. 10-MS33888-81
11-Waveguide assy-7928054
33-Screw, machine, pan hd, no. 10-24, 1/2 in. Ig,
12-Cable assy-7923029-7
UNC-2A-MS51957-63
l3-Cable assy-7923029-6
34-Washer, nylon-7923098-2
14-Waveguide assy, "Z" bend-7928046-1
35-Fastener, pawl, modified (and nut) -7928259
15-Screw, machine, pan hd, no. 6-82, 5/8 in. Ig,
36-Knob, control, round, plastic, ribbed gripping
UNC-2A-MS51957-80
surface-MS91528-ODIB
16-Washer nylon-7923098-1
37-Bearing, flanged-7923258
17-Mixer, harmonic-7923087
38-Counter assy-7923056-7
18-Coupler, directional-7923152
39-Support, waveguide-7923043
19-Clamp, loop-plastic, wire support-MS26281-6
40-Washer, flat-MS27183-6
20-Nut, plain, hex, machine screw, no. 62, UNC-2B-
41-Screw, machine, fiat-counter-sunk hd, no. 6-32,
MS35649--62
1/2 in. Ig, UNC-2A MS35190-238
42-Chassis, rf head-7923027-1
Figure 4-28. View-Continued
b. netic fields, all work must be performed in a
(e) Install gear (17) on counter assembly (19) shaft
location free from possible magnetic fields. Work
surfaces and tools must be non-magnetic. Refer to
and engage with gear (16). Do not tighten setscrew.
exploded view, figure 4-28, and wiring diagram,
(f) Install gear (16) on shaft of variable resistor
(18). Do not tighten setscrew.
Caution. Exercise extreme care when removing BWO
(g) Check counter setting and position of variable
tube to avoid damage to adjacent and related electronic,
resistor (18). Both settings must be as specified in (c)
electrical and mechanical components and assemblies.
and (d) above.
(h) Secure gears to respective shafts with
(1) Remove left side cover (1, fig. 4-28) by
removing 10 screws (2) attaching it to rf head chassis
setscrews.
(42).
4-22. Disassembly and Assembly of K-Band
Caution. The soldering iron used should be
Rf Head
pencil type, 15 watts or less, connected through
To disassemble the K-band rf head, refer to exploded
view, figure 428, and wiring diagram, figure 4-29, and
a thermostatically controlled stand. Apply
follow procedures a through d below,
a. Removal of BWO Tube 792s112. Before removing
(2) Unsolder and remove the green, orange, and
BWO tube, read and observe all instructions
blue harness leads from connector bracket assembly (3)
appearing on the tube and rf head case. Since
solder lug (refer to 17, fig. 4-12).
BWO tube emanates strong mag-
4-45
