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7.
ALIGNMENT
PROCEDURE
REOUIRED
INSTRUMENTS
.
FM/AM
Signal generator
o
FM/AM
Sweep
generator:
Center
frequency
10.7MH2,
455k}Iz
.
Oscilloscope
.
AC
VTVM
.
FM
multiplex
signal generator
preferbly
with
RF
output
7.1 FM/AM
IF
ALIGNMENT
O
FM SECTION
a)
Connect
a
0.01pF
capacitor between
TP1
and
ground before the
alignment.
b)
Connect a
ZZOkdL
resistor
in
series
with
the
vertical
input
terminal
of
the
oscilloscope.
c)
Remove.
the
meter
lead
from
terminal
18,
then
terminate
a
4.7kQ
resistor
between
terminal
18 and ground.
d)
Connect
the
vertical
input to
terminal
18.
e)
Set
the
selector
switch
to
FM
MONO.
f)
Connect
the output
lead
of
the
sweep
generator
to
the FM
antenna terminals.
g)
Set
the output
level
of
the
sweep
generator
to
90dts.
h)
Adjust the primary
and
secondary
cores
of
T6
to
obtain
a
symmetrical pattern.
i)
Set
the output
level
of
the
sweep
generator
to
70d8.
j)
Adjust the
cores
of T4
and
T5 for
maxi-
mum
gain and
symmetry
of
the pattern.
k)
Vary the output
level
of
the
s$/eep
ger
a-
tor
from
60dB
to
100dB, then
keep
the top
of
the pattern
flat
and make
sure
that
the
center frequency
does
not
drift.
If it
drifts,
repeat
steps
(g)
to
(j).
l)
Remove
the
capacitor
(4.71tF)
from
ter-
minal
28.
m)
Disconnect
the
vertical
input from
terminal
18,
then reconnect
it
to
TP1.
n)
Set
the output
level
of
the
sweep
generator
to
7OdB.
o)
Observe
the
S-curve
pattern
when adjusting
the
cores
of T7.
(Linearity
is improved by
the primary
core;
symmetry
by the
second-
ary core.)
p)
Disconnect
the
0.01trtF
capacitor
from
TPl
after the alignment
has
been completed.
q)
Connect
the
capacitor
(4.7trtF)
to
terminal
28 after the alignment
has
been eompleted.
.
AM
SECTION
a)
Turn
the selector
switch
to
AM.
b)
Connect
the output
lead
of
the
sweep
generator
to
the AM
antenna
terminal.
c)
Connect
the
vertical
input
of
the
oscillo-
scope
to
the TAPE
REC
jack.
d)
Set
the output
level
of
the
sweep
generator
to
75d8.
e)
Adjust the
IFT
cores
(T9, T10, T11)
as
shown
in
Fig. 1,
for
maximum
gain
and
symmetrical pattern.
7.2
FM/AM
TACKING
ALIGNMENT
.
FM SECTION
a)
Turn
the selector
switch
to
FM
MONO.
b)
Connect
the output
leads
of
the
FM
signal
generator
to
the FM
antenna terminals.
c)
Set
the FM
signal
generator
to
modulation
4O0Hz,
30Vo
and output
level
15dB
fre-
quency 90MHz;
also set
the
receiver
dial
at
9OMHz.
d)
Conneet
the VTVM and
oscilloscope (in
parallel)
to
the
TAPE
REC
jack.
e)
Observing
the output
level
on the VTVM,
adjust the following
cores
for
maximum
reading
on
the meter.
Tg
..
Oscillatorcircuit
T1
...
Antennacircuit
T2
..
RFcircuit
f)
Set
the
frequency
of
the FM
signal
gene-
rator
and
the
receiver
dial
to
106MHz.
g)
Adjust
as
follows:
Trimmer capacitor
CT3:
Oscillator
circuit
Trimmer capacitor
CTl
.
.
Antenna
circuit
Trimmer capacitor
CTz
.
RF
circuit
h)
Repeat
steps
(e)
to
(g)
several
times.
i)
Set the output level
of
the FM
signal
generator
to
maximum
signal
meter
deflec-
tion.
j)
Adjust the primary
core
of T7 for
mini-
mum
sound
distortion.
10