TB 9-4931-700-50
(8) Adjust A12L1 (fig. 1) to obtain frequency recorded in (7) above.
(9) Adjust FREQUENCY control counterclockwise to obtain FREQ scale
indication of 10 kHz while observing frequency counter to insure that indication does not
pass through 0 (zero) Hz. If output frequency passes through 0 (zero) Hz, repeat (2)
through (8) above.
(10) Adjust FREQUENCY control to obtain scale indication of 1.0. Adjust A12C2
to obtain indication of 10.00 kHz on frequency counter.
(11) Repeat (6) through (10) above until frequency counter indications are within
tolerance at frequency settings of 10 and 100 kHz.
(12) Repeat a(2) through (4) above and if lower frequency ranges (X10) through
X1K) are still out of tolerance, perform (a) through (t) below.
(a) Extend circuit board A12A2 (fig. 1), using extender board furnished with
TI.
(b) Connect oscilloscope (A7) to A12A2TP1 (fig. 1), using probe (B11).
(c) Adjust A12A2T1 (fig. 1) to obtain maximum amplitude of ac signal
displayed on oscilloscope (R).
(d) Press FREQUENCY RANGE X10K pushbutton and adjust FREQUENCY
control to obtain FREQ scale indication of 1.0.
(e) Connect oscilloscope to A12A2TP2 (fig. 1), using probe.
(f) Adjust A12A2C11 and A12A2C18 (fig. 1) to obtain maximum amplitude of
ac signal displayed on oscilloscope (R).
(g) Adjust FREQUENCY control to obtain FREQ scale indication of 11.0.
(h) Adjust A12A2C14 (fig. 1) to obtain maximum signal amplitude (R).
(i) Adjust FREQUENCY FREQ scale indication of 1.0.
(j) Adjust A12A2C11 (fig. 1) to obtain maximum signal amplitude.
(k) Adjust FREQUENCY FREQ scale indications of from 1.0 to 11.0. Signal
amplitude will be approximately same at both ends. Adjust A12A2C18 (fig. 1) to obtain
same amplitude at both ends.
(l) Signal at A12A2TP2 will be 0.7 volt p-p or greater at frequencies from 10
to 110 kHz.
(m) Replace circuit board A12A2 in the TI and extend circuit board A12A3
(n) Connect oscilloscope to A12A3TP1 (fig. 1), using probe.
(o) Adjust A12A3T1 (fig. 1) to obtain maximum signal amplitude as indicated
on oscilloscope (R).
(p) Adjust FREQUENCY control to obtain FREQ scale indication of 5.5.
(q) Connect oscilloscope to A12A3TP2 (fig. 1), using probe.
(r) Adjust A12A3C11 A12A3C14, and AJ2A3C18 (fig. 1) to obtain maximum
signal amplitude indication on oscilloscope (R).
(s) Replace circuit board A12A3 in TI and extend circuit board A12A4 fig. 1
using extender board.
