Read Sony ICF-B200 Service Manual online
– 7 –
– 8 –
SECTION 4
ELECTRICAL ADJUSTMENTS
AM
AM RF signal
generator
generator
30 % amplitude
modulation by
400 Hz signal
modulation by
400 Hz signal
Put the lead-wire
antanna close to
the set.
antanna close to
the set.
set
8
Ω
speaker terminal
level meter
(range : 0.5 – 5 V ac)
FM
FM RF signal
generator
generator
0.01
µ
F
to FM antenna
terminal
22.5 kHz frequency deviation
by 400 Hz signal
output level : as low as possible
by 400 Hz signal
output level : as low as possible
set
8
Ω
speaker terminal
level meter
(range : 0.5 – 5 V ac)
• Repeat the procedures is each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
done by the trimmer capacitors.
Adjustment Location : main board
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
455 kHz
AM FREQUENCY COVERAGE
ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
CT3
520 kHz
1,650 kHz
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
CT4
620 kHz
1,400 kHz
FM FREQUENCY COVERAGE
ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
CT1
86.5 MHz
109.5 MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
CT2
86.5 MHz
109.5 MHz
AM
TRACKING
ADJUSTMENT
FM
TRACKING
ADJUSTMENT
AM FREQUENCY
COVERAGE
ADJUSTMENT
FM FREQUENCY
COVERAGE
ADJUSTMENT
T1
AM IF
ADJUSTMENT
L1
CT4
L3
CT3
L4
CT1
L2
CT2
– main board (component side) –
– main board (conductor side) –
SECTION 5
DIAGRAMS
•
IC Block Diagrams
IC1 CXA1019S
IC3 BA10324AF
1
2
3
4
5
6
7
8
9
10
15
14
13
12
11
FM
DISCRIMINATOR
AF POWER AMP
AM FE
FM IF
TUNING
METER
AM IF DET AGC
FM FE
23
22
21
20
24
25
19
18 17 16
29 28 27 26
30
GND
GND
AF OUT
VCC
RIPPLE
FIL
TER
AF IN
DET OUT
AFC AGC
AFC AGC
IF GND
METER
N.C
FM IF IN
AM IF IN
FM/AM BAND
SELECT
FM/AM
IF OUT
FE GND
N.C
AM RF IN
FM RF
REG OUT
FM OSC
FM RF IN
AFC
AM OSC
VOL
NF
FM DISCRI
GND
GND
1
2 3 4
5 6
7
8
9
10
11
12
13
14
OUT1
–IN1
+IN1
VCC
+IN2
–IN2
OUT2
OUT4
–IN4
+IN4
GND
+IN3
–IN3
OUT3
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