
16. YTO Loop Adjustments
I
SPECTRW
ANALYZER
Figure 3-69. YTO Loop Adjustment Setup
AZlTP2
AllJl
AllJ2
AllAl
AllJ3
Wll
A12TP2
A12TP3
AllJ5
AllJ4
e
. .
e .
-a-,
AT2,'A6W6
Figure 3-70. Location of Assemblies, Cables, and Test Points
3. On the All YTO Loop Assembly, disconnect the cable 8 (gray)
from AllJl PHASE DET OUT, the cable 93 (white/orange) from
AllJ2
M/N
IN, and the cable 5 (green) from AllJ3
20/30
IN.
Disconnect cable 0 (black) from AllJ4 IF IN and AllJ5 IF OUT.
See Figure 3-70.
4. Connect a jumper between
A12TP2
and
A12TP3
(LOCK
INDICATOR DISABLE)
on
the Al2 Front Panel Interface Assembly
in the RF Section. Connect a jumper between
A21TP2
TUNE
VOLTAGE and the RF Section chassis ground. See Figure 3-70.
5. Install the All
YT.0
Loop Assembly in the Service Position by
removing the three screws (marked with the letter A) securing the
Al 1 YTO Loop Assembly in the RF Section. Figure 3-71 shows the
All service position. Grasp the two metal extractors on the All
assembly, and slide the assembly upwards until it just clears the
RF Section. Rotate the assembly
90”
towards the front. of the RF
Section and secure the Servicing Support Screw to the threaded
3-136 Adjustments
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