 |
|||
|
|
|||
|
Page Title:
Isolating Trouble in Module A13 |
|
||
| ||||||||||
|
|  (receptacle for A9) and chassis
(a) Signal voltage chart.
ground.
Connect the AN/USM-26 and the
(2)
411A across the AN/URM-48 out-
put. Adjust the AN/URM-48 fre-
quency to 46.500 mc as indicated
by the AN/USM-26; set the output
level to 3 millivolts as indicated
by the 411A.
(b) Dc voltage chart.
(3)
Disconnect the 411A from the AN/
URM-48 and connect it between
A18J2 and chassis ground.
Set the receiver-transmitter tun-
(4)
ing knobs to 30.00 mc.
Record the voltage level at A18J2
(5)
as indicated by the 411A. This level
should be approximately 40 milli-
(2) After the replacement of a faulty
volts.
part, perform the alignment pro-
Adjust the AN/URM-48 frequency
(6)
dures given in paragraph 86 and
to 47.400 mc as indicated by the
repeat the procedures given in a,
AN/USM-26. (Maintain the 3-mil-
b, and c above. Replace module
livot output level.)
A13. Remove the module extender.
Set the receiver-transmitter tun-
(7)
e. Preparation for Alignment.
(1) Be sure to perform the preparation
ing knobs to 30.90 mc.
procedures given in a above.
(8)
Record the voltage level at A18J2
as indicated by the 411A.
(2) Connect the AN/URM-25F between
If the indication obtained in the
pin B of A12J1 and chassis ground.
(9)
Connect the 411A and the AN/USM-
26 across the AN/URM-25 output.
(3) Adjust the AN/URM-25F frequency
to 5.60 mc and the output level to
10 millivolts as indicated by the
411A.
(4) Connect the 411A between A12J2
and ground.
f. Alignment Procedure. To align mod-
ule A12, alternately adjust T1, L1, T2,
and L2 for a maximum indication on the
411A.
a. Preparation.
(1) Prepare the following equipment:
(a) Signal Genenator AN/URM-48.
(b) Frequency Meter AN/USM-26.
(2) Turn the receive r-transmitter
function switch to ON.
b. 53-Mc Filter Test.
(1) Remove module A9 and connect the
AN/TIRM-48 between pin 1 of J6
Figure 64. Module A12, parts location,
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals