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Page Title:
Replacement of Fixed20-DB Attenuator AT701 |
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|  Machine screw
1
Machine screw
30
31
Lockwasher
2
Lockwasher
32
Spring
3
Rear fixed plate
33
Roller
Machine screw
4
Barrel assembly
34
Lockwasher
5
Machine screw
35
Rotary switch section S701
6
36
Lockwasher
Sleeve spacer
7
Machine screw
37
Locating ring
8
Lockwasher
9
38
F i x e d attenuator
Support
10
F i x e d attenuator
39
Rear movable plate
40
11
F i x e d attenuator
12
Set srew
41
F i x e d attenuator
13
Connector J718
42
F i x e d attenuator
Machine screw
11
F i x e d attenuator
43
Bushing
15
Connecting tube
44
Connecting link rod
16
Machine screw
45
hfachine screw
17
46
Lock washer
Bushing
18
47
Locating ring
Connecting link rod
19
Setscrew
48
Front movable ~Jl ate
20
Guide
49
21
Setscrt'w
Machine screw
50
22
Connector J719
51
Lockwasher
Setscrew
Front fixed plate
23
52
Bridge
24
Sleeve spacer
53
Machine screw
25
Sleeve bushing
54
Bushing
26
Retaining ring
55
Center connecting link rod
27
Attenuator shaft
56
Machine screw
28
Right angle adapter CP705
57
Bushing
29
Figure 90 Continued.
r i g h t - a n g l e adapter CP703, which
cable of Cable Assembly Set, Electrical
is mounted directly beneath the im-
MX-3410/URM-85 for this connection. Use
p u l s e generator housing.
t h e red color-coded cable to interconnect
(3) Use an ohmmeter to check the fixed
t h e second jack on the antenna to the
attenuator for continuity from cen-
SIGNAL INPUT jack on the main unit. With
t e r conductor at the male N-type
the calibration switch now in the SERIES
c o n n e c t o r to the center conductor
C A L & OPERATE position, and with the
of the female N-type connector. An
impulse generator output controls remain-
infinite o h m m e t e r reading in-
i n g in their original positions, the panel
d i c a t e s an open circuit within the
meter should show the same indication as
attenuator which cannot be repaired
in the shunt calibration condition. Failure
i n the field. Also check for in-
to obtain this correspondence in meter in-
f i n i t e resistance from the center
dications is cause for suspecting a defect
c o n d u c t o r of either the male or
in the connections to fixed 20-db attenuator
female connector to the outer shell
A T 7 0 1 , or in the attenuator itself. The
o f the attenuator. If a reading of
attenuator is mounted in a horizontal posi-
O ohm is obtained, the attenuator
tion above the main deck of the chassis and
has developed an internal short
a d j a c e n t to electron tube V706 and dual-
circuit which cannot be repaired in
section filter capacitor C733 (fig. 52). To
the field.
r e m o v e the attenuator for inspection and
(4) If either of the defects outlined in (3)
r e p l a c e it, proceed as follows:
--
(1) Un&ead the k n u r 1 e d ring of
above is present, use a known good
replacement fixed 20-db attenuator
right-angle adapter CP702 from
A T 7 0 1 and install it in the main
t h e output end of fixed 20-db at-
u n i t by reversing the disassembly
tenuator AT701 (fig. 52).
procedure of (1) and (2) above.
(2) Unthread the fixed attenuator from
187
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