TB 9-6625-2271-40
b. Adjustments
NOTE
All adjustments interact and must be performed in their
entirety. After making adjustments in this section, it is
necessary to return to beginning of procedure.
(1) Connect spectrum analyzer input to TI MONITOR (rear panel).
(2) Connect TI OUTPUT HIGH to INPUT HIGH and LOW using tee connector
and two cables.
(3) Press keys and enter values using DATA ENTRY keys as listed in (a) through
(g) below:
(a) LCL INIT.
(b) INPUT FLOAT (assure illumination).
(c) SPCL.
(d) 28 ENTER.
(e) SOURCE LEVEL.
(f) 3 V.
(g) ANALYZER LEVEL.
(4) Adjust spectrum analyzer controls to observe a 1 kHz signal.
(5) Alternately adjust A0R29 and A0C35 (fig. 3) for minimum indication on
spectrum analyzer (R).
(6) Press SPCL key and enter 27 ENTER using DATA ENTRY keys. Adjust
A0R12 (fig. 3) for minimum indication on spectrum analyzer.
(7) If <-75 dB was not achieved in (5) or (6) above, then alternately adjust A0C5,
A0C10 and A0R12 (fig. 3) for minimum indication on spectrum analyzer (R).
Figure 3. Input board - adjustment locations.
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