Sanyo FT200F-4 - Alignment Procedures; FM RF Alignment; AM IF and RF Alignment; FM IF Alignment

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-