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ALIGNMENT
PROCEDURES
General
Test Conditions
Signal
generator
output:
Modulation
frequency
AM400Hz,
FM 1000Hz
Modulation
percentage
Afvf30~o,
FM22.5kHz
Signal
level just high enough
to provide
meter deflection.
Signal
application:
Antenna
receptacle
through
the dummy
antenna.
Output
meter
connection:
Across
a speaker
or a dummy
load 4 ohms.
Setting
of radio controls:
Volume
control
at maximum
response.
Tone control
at high note position.
Power
supply:
14.4V
Locations
of the components
for alignment
are shown
in MAIN
PARTS
IDENTIFICATION
ILLUSTRATION.
Alignment
of Head Azimuth
1. Insert a BASF 6.3kHz
standard
test tape and set the unit in
play mode.
2. Turn the azimuth
adjusting
screw until you obtain
maximum
reading
on the VTVM.
AM IF and
RF Alignment.
Signal
Frequency
Dial
Component(s)
to
Step
Input
of Signal
Setting
of
be Adjusted
for
Gen.
Radio
Maximum
Output
u
1.
460 kHz
Lowest end
IFT L8, L1O
H?-
Align steps
1, 2, 3 and 4.
With radio installed
in car and antenna
fully extended, tune in
weak station near 1400 kHz and adjust C32 for maximum
volume.
Fig.1 DUMMY ANTENNA FOR AM RF ALIGNMENT
r––––___7
15PF
To
antenna
socket
~~.n
L – –
– – – _
_ ~
Rl=80-Rsg
(ohms);
Rsg: Internal
resistance
of a signal
generator
used.
FM IF Alignment
t--i
m
to
ANT. ierminal.
-
2
10.7 MHz
Audio output
obtained from IC1
pin 9.
I
I
1
1
I
Retune L5, L9 by checking S curve as shown in Fig. 3.
It is not necessary to tune exactly 10.7 MHz marker to the
center of S curve.
FM RF Alignment
Step
1.
2.
-
ANT.
socket
Confirm overall tuning range to be from 87.2-
87.5 MHz to 108.0 -108.5
MHz.
Fig. 2 SYMMETRICAL
Fig. 3 SYMMETRICAL
RESPONSE
CURVE
S CURVE
/
I
\
DIAL CORD
STRINGING
\
—
--5
/
J(I
%
w<
.,
n-:-.,...
' "-'-st
end 'O' point at same
2zI&Q4
k
rulrt~er
LUW.S3
time
String
: a 0.3 x 460 mm
IC AND TRANSISTOR
VOLTAGE
CHARTF———
ICI
Iclol
IC301
1
14.8
1.29
0.4
4
2
1.49
0.76
0
3
2.27
3.34
3.71
4
2.27
13.02
0
5
0.93
0
0
6
0.93
3.26
0.38
7
0
0.75
0
8
0
1.28
6.62
9
1.32
0
10
8.5
13.43
11
8.5
0
12
1.39
0
13
1.38
13.77
14
1.39
13.43
15
1.39
6.53
16
6.51
w
— 1-
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