Specifications

(5)
(6)
(7)
(8)
(9)
(10)
(11)
Figure 29. Assembly A7400, parts location..
Move the 411A to connector P7501-
C and P5701-D. The normal indi-
cation should be less than 3 db
Move the 411A to connector P7501-
M and P7501-L and adjust the
666A output frequency to 5.6446
mc ±100 cps as indicated by the
AN/USM-26 and for a 0-db indi-
cation on the 411A.
Move the 411A to connector P7501-
C and P7501-D. The normal indi-
cation should be less than 3 db
down.
Move the 411A to connector P7501-
M and P7501-L and adjust the 606A
output frequency to 5.6434 mc ±100
cps as indicated by the AN/USM-
26 and for 0-db indication on the
411A.
Move the 411A to connector P7501-
C and P7501-D. The normal indi-
cation should be less than 6db
down.
If the indication obtained in (3),
(5), (7), or (9) above are not nor-
mal, replace filter FL7501.
If the indications obtained in (3),
(5), (7), or (9) above are normal,
trouble isolation in assembly
A7500 is complete.
57. Isolating Troubles in Assembly A7600
Refer to figure 39 for circuit details —
and figure 31 for test point and parts loca-
tion.
a. Preparation.
(1)
(2)
(3)
(4)
Set TS-1777/VRM-l selector
switch S7902 to position 14.
Connect Hf Signal Generator 606A
to the test probe, and adjust for an
output frequency of 11.500 mc at
0 volt.
Connect Rf Millivoltmeter 411A to
connector P7601-C.
Connect the ME-26B/U to con-
nector P7801-H and adjust it to in-
dicate + volts dc on the 30-volt
scale.
b. Gain Test.
(1)
(2)
(3)
Adjust the 606A output for a 411A
indication of 10 mv.
Adjust potentiometer
maximum indication
26B/U.
Adjust transformers
T7602 and inductor
R7611 for a
on the ME-
T7601 and
L7603 for a
58