Quantcast Replacement of Logic Circuit Card Assembly A79A1

 

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Figure 3-4. Disassembly of Laser Ranging Commander's Control C-9134/VVG-1 (A79) (Sheet 2 of 2 sheets)
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TM-9-1240-369-34 Range Finder Fire Control: (Laser) AN/VVG-1 (1240-00-470-2156) Manual
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Replacement of Lamps
TM 9-1240-369-34
KEY to fig. 3-4:
(4) Remove the logic circuit card assembly.
1. Screw--NAS163-06-6
(5) Install new logic circuit card assembly by
2. Washer--NAS620C6L
performing steps (2) thru (4) in reverse order.
3. Access cover--11738817
(6) Install  access  cover  as  instructed  in
4. Screw locking assembly--11739036
paragraph 3-9 a steps (2) and (3).
c. RepIacement of Readout Circuit Assembly A79A2
5. Connector A1P1--M24308/3-4
6. Screw--NAS1635-04-4
7. Screw--NAS1352-04-4
(1) Remove access cover as instructed in
8. Washer-AN960C4
paragraph 3-9 a step (1).
9. Logic circuit card assembly A79A1-11737334
(2) Remove screw (10), three screws (11), four
10. Screw--NAS1635-04-4
washers (12) and readout circuit assembly A79A2 (13).
11. Screw--NAS1352-04-4
(3) Loosen  two  screws  on  screw  locking
12. Washer--NAS620C4
assembly (14) and disconnect harness connector W1P1
13. Readout circuit assembly A79A2-11737350
(15) from connector A2J 1 on readout circuit assembly
14. Screw locking assembly--11739036
A79A2 (13).
15. Connector W1P1--M24308/1-3
(4) Install new readout circuit assembly A79A2
16. Screw--MS3213-7
(13) by performing steps (2) and (3) in reverse order.
17. Lens bracket--11737330
(5) Install  access  cover  as  instructed  in
18. Lens gasket--11737331
paragraph 3-9a step (2) and (3).
19. Filter lens--1737329
d. Replacement of Lens Gasket and Lens Filter (see
20. Insert-MS21209C0415.
21. Switch lens seal--11745629
(1) Remove access cover as instructed in
22. Switch lens--11741527-1
paragraph 3-9 a step (1).
23. Switch lens--11741527-2
(2) Remove readout circuit assembly A79A2 as
21. Switch lens--11741527-3
described in paragraph 3-9 c.
25. Seal adapter--11737385
(3) Remove eight screws (16), lens bracket (17)
26. Lockwasher--part of item 28
lens gasket (18), and filter lens (19).  Inspect screws.
27. Key washer--part of item 28
washers and inserts (20) for damage and replace as
28. Switch S4 thru S6--11745600
necessary.
29. Preformed packing--NAS1523AA7Y
(4) Before installing lens gasket, lubricate by
33. Lamp--11738097
applying thin uniform film of grease, MIL-G-4343. Apply by
31. Nut--part of items 28 thru 32
hand to both surfaces of the lens gasket.
32. Lockwasher-MS35338-138
(5) Install new lens gasket or filter lens by
33. Indicator light DA5--11737364-1
performing steps (2) and (3) in the reverse order.
34. Indicator light DS4--11737364-2
(6) Reinstall access cover as instructed in
35. Indicator light DS6--11737364-3
paragraph 3-9a steps (2) and (3).
36. Indicator light DS8--11737364-5
e. RepIacement of RANGE RETURN SELECTOR
37. Indicator light DS7--11737364-4
switches S4 thru S6 and Switch Lens Seals (21) (see fig. 3-
38. Preformed packing--MS28775-009
4). The following steps are applicable to each indicator S4
39. Switch lens seal--11737499-1
thru S6 and its switch lens seal (21).
40. Seal adapter--10737544
(1) Remove access cover as instructed in
41. Lockwasher--part of items 39 or 40
paragraph 3-9 a step (1).
42. Key washer--11745580
(2) Unscrew applicable switch lens seal (21) from
43. Preformed packing--NAS1523AA7Y
housing with boot removal tool (21, table 2-2).
44. DMR switch S1--MIL-S-8805/99-004
(3) Pull applicable switch lens (22, 23 or 24)
45. TSW switch S2--MIL-S-8805/99-032
straight out from housing.
46. Housing--11738815
(4) Tag all leads  to applicable switch  for
b. Replacement of Logic Circuit Card Assembly
identification. Unsolder leads.
A79A1 (see fig.3-4).
(5) Remove  applicable  seal  adapter  (25)
(1) Remove access cover as instructed in
lockwasher (26), key washer (27), switch S4 thru S6 (28)
paragraph 3-9 a step (1).
and preformed packing (29) from housing.
(2) Remove three screws (6), three screws
(6) Lubricate preformed packing (29) by applying
(7), and six washers (8) that secure the logic circuit card
a thin, uniform, film of grease, MIL-G-4343.
assembly (9) to housing.
(7) Install new switch lens seal and switch by
(3) Loosen two screws on screw locking
performing steps (1) thru (5) in reverse order. Install switch
assembly (4) and disconnect connector A1P1 (5) from
lens seal with boot removal tool (21, table 2-2).
harness connector W1J1.
3-13

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