Fm Tracking Alignment; Checking Muting Function; Rear Panel - Pioneer TX-600 Service Manual

5-3.
FM
TRACKING ALIGNMENT
(a)
T\rrn the
selector switch
to
T'M.
(b)
Connect
the output
leads
of
sweep
generator
to
the FM
antenna terminals.
(c)
Connect the vertical
input
leads
of
oscillo-
scope
to
the
TAPE REC terminal
@.
(d)
Set the output
level
of
sweep generator
to
modulation
400 Hz,
L}OVo
and
level
15
dB, the
frequency
set
to
9
0
MHz
under
the test
equipment's dial set
at
90
MHz.
(e)
Connect
the V.T.V.M. and
oscilloscope
to
the TAPE REC
terminals.
(
f
) Observing
the
ou tpu
t
level
on
the
V.T.V.M. and adjust the
following
cores
to
get
maximum reading
on the
meter.
T3
.....
Oscillatorcircuit
T1
Antenna
coil
circuit
T2
RF circuit
(g)
Set
the
frequency
of the FM
signal
generator
and
dial pointer of
equipment
to
106
MHz.
(h)
Follow the
steps below
to
adjust
the
adjusting points:
Tlimmer
capacitor
CTg:
Oscillator
circuit
Tlimmer
capacitor CTf
:
Antenna circuit
Trimmer capacitor CTZ: RF circuit
(f)
Repeat
the
steps
( f
) to
( h
)
several
times.
(
j
)
After the
alignment,
lock the
trimmer
*
capacitor
with
paint.
ADJUSTING
POINTS
ADJUSTING
5-4. CHECKING MUTING
FUNCTION
(a)
Connect
the output
leads
of
FM
signal
generator
to
the FM
antenna
terminals.
(b)
Connect
the
vertical
input
leads of
oscilloscope
to
the
TAPE
REC terminals.
(c) Set the output level of FM
signal
generator
to
16 dB
and
turn
the muting
switch
or, then
check
the
muting
function
on the
scope.
The
muting
function
is
designed
to
the
function
at
about 16 dB
input.
o
TAPE
REC
I
POINTS
v.T.v.M.
REAR
PANEL
I
I
DUMMY ANTENNA
I
I
ll
r€
I
o
Oo
c
o;
oo
o
303
J
GENERATOR
10
Fig.
5