Filter
Top Products
Malntenance
-
494A/4g4Ap
Service
Vol.
1
Flgure
6-'15.
829
MH:
Converbr
lilte.
hlne
tabs.
Troubleshooting
and
Calibrating
the
2nd
LO
The
2182 MHz
Oscillator
and
2200
MHz
Reference
Mixer
contain
critical
printed
elements
that
are
difficult
to repair. Therefore
the
board should
be replaced
if
damaged.
lf
the oscillator
frequency
is
beyond
adjust_
ment
with
the
frequ€ncy
adjust
tab
after
replacing
either
the varactor
or
the
oscillator
transistor
for
the
2182
MHz
Oscillator,
the
circuit
board
must
be
replaced.
Even
though repair
can
be
accomplished
by replac-
ing
the
board, it is
recommend
that
the
instrument
or
assembly
be
returnEd
to
your
Tektronix
Service
Center
for
repair
to
ensure
best
performance.
Figure 6-16.
Correct responee for 829 MHz
first
and
second
resonators.
The 2182MHz
2nd LO requires calibration
only
when a component
within the assembly has been
replaced.
Table 6-7
lists
test equipment required
to
calibrate
the
LO
section,
and
Table 6-8 lists equipment
for
the
Phase Lock section.
o
o
o
o
o
o
a
o
o
O
o
o
o
a
o
o
I
o
a
o
o
o
o
o
a
o
o
o
o
o
o
o
o
o
o
t
o
o
o
o
o
O
o
o
A. lsl Resonalor
Response
B.
2nd Regonator
Response
Fe5
2727-159
6-42