Diagrams; Ic Block Diagram - Sony SW11 - ICF Portable Radio Service Manual

SW FREQUENCY CENTER ADJUSTMENT
Adjust for a maximum reading on Level meter.
SW1 L25 4.85MHz (3.88MHz)
SW2 L24 6MHz
SW3 L23 7.2MHz
SW4 L22 9.62MHz
SW5 L21 11.8MHz
SW6 L20 13.65MHz
SW7 L19 15.35MHz
SW8 L18 17.65MHz
SW9 L17 21.6MHz
1. After completion of SW1-9 adjustment, confirm that each center
frequency +910kHz signal is received from AM reference signal
generator.
2. If not received, readjust, then repeat 1.
( ) : Tourist model
MAIN BOARD (conductor side)
D2
TUNE
2
L26
CV-1,CT-1
TUNING
Adjustment Location : MAIN board (component side)
L2
L1
LW CT3
L5
MW
Tracking
LW Frequency LW Frequency
Tracking
Adjustment T1
Coverage Coverage
Adjustment
AM IF
Adjustment Adjustment
Adjustment
L24 L21 L25 L23 L22 L20 L19 L18 L17
RV1
SW Frequency Center Adjustment
VCO
Adjustment
[VCO Adjustment]
Procedure :
FM RF signal
generator
Center frequency :98 MHz
Modulation : no modulation
Output level : 0.1 V (100dB) telescopic antenna input
1. Insert the plug to Headphones jack (J1).
2. Connect frequency counter to the positions shown the figure
right.
3. Tune the set to 98 MHz.
4. Adjust RV1 so that the frequency counter reading becomes
76,000Hz.
Specification Value :
Frequency counter
75,950 – 76,050 Hz
L29
C
B E
C
CF2
16
B E
20
C36
25
C39
R16
1
L6
30
CT1-1
L7
33k
L4
MW Frequency 1 F
Coverage
Adjustment
L6
FM Tracking
CT1-3
Adjustment
CT1-1 MW Tracking
Adjustment
CT2 LW Tracking
Adjustment
CT1-2 MW Frequency
Coverage
Adjustment
L7 CT1-4
FM Frequency Coverage Adjustment
— 7 —

4-1. IC BLOCK DIAGRAM

IC1 CXA1238M-T6
30 29
Set
1 2 3
E
C
B
15
10
5
1
Frequency counter
+
–
SECTION 4

DIAGRAMS

28 27 26 25 24 23 22 21 20
FM FRONT-END
AM FRONT-END
REG
VCO MPX REG.
1/2
PD1
COUNTER
1/2
PD2
COUNTER
AUTOBLEND
MONO/ST
MUTING
SELECT
RIPPLE
DECODER AMP
FILTER
4 5 6 7 8 9
— 8 —
ICF-SW11
19 18 17 16
FM IF/
DISCRI
AM
IF/DET
TUNING
INDICATOR
BAND PASS
MUTE
10 11 12 13 14 15