Diagrams; Block Diagram - Sony ICF-M33RDS Service Manual

SECTION 4

DIAGRAMS

4-1.

BLOCK DIAGRAM

CT2, L3
FM TRACKING
L3
FM RF
ANT1
FM TELESCOPIC
ANTENNA
CT2
D2
9
FM
RF
FM RF
IN
B.P.F. FM +
12
BPF1 FRONT-END
CT1, L2
L2
AM (LW)
AM (LW)
FERRITE-ROD
TRACKING
ANTENNA
AM RF
IN AM
10
FRONT-END
D1 (1/2) CT1
5 7
L5
AM (LW)
VCO VOLTAGE
L5
AM (LW)
OSC
D1 (2/2) D3
20 19
FM/AM PLL
LOW-PASS
IC2
FILTER 23 DO1
Q2, 3
5 6 7 2 1
X1
75kHz
47 49 48
LCD0 – LCD31 COM0 – COM3 LIGHT
58 59 55 56 69 – 80, 1 – 20 21 – 24 34, 35
X102 X101
4.33MHz 32.768kHz
LIQUID CRYSTAL DISPLAY
LCD101
D101, 102
(LCD BACK LIGHT)
05
– 11 –
FM/AM FRONT-END,
FM/AM IF AMP, DET, AGC, AF AMP
IC1
FM/AM FM DET
FE OUT CF2 IF IN OUT
FM +
14 17 23
IF AMP
FM
CF3
DISCRI
FM
2
T1 DISCRIMINATOR
AM IF
AM
CF1
IF IN
AM IF AMP,
16
AGC, DET
FM/AM
TUNING METER
BAND
SELECT
METER
15 19
L4
FM
4
VCO VOLTAGE
MUX
RDS DECODER
IC3
ANTI-ALIASING
L4
FILTER
FM OSC
COMPARATOR
PLL 57kHz
RDS/ARI
CLOCK
OSC
BIPHASE
OUT
DECODER
14
X2
OSC OSC
4.332MHz
DEFFERENTIAL
IN
13 DECODER
BAND SELECT
I/O-1 9 SWITCH
Q7
2
45 44
SYSTEM CONTROLLER,
LCD DRIVER, KEY CONTROL
IC101
KS0 – KS3 KR0 – KR5
29 – 32 62 – 67 61 52 37 36
S101
STATION NAME
STATION
S102 – 117 (SYSTEM CONTROLLER IC101 B+)
(KEY MATRIX)
CLOCK
• SIGNAL PATH
: FM
: AM (LW)
AF
AF
IN EJ1
AF OUT
24 27
POWER AMP @
(EARPHONE)
SP1
(SPEAKER)
3 4
RV1
VOL
MUTING
Q1
PLL
1187.5Hz
LCD DRIVE
VOLTAGE GENERATOR
IC104
16
43 46 53 26
68 38
VOLTAGE DETECT
IC102
RESET SIGNAL
GENERATOR
IC103
D8
BACKUP B+
TUNER B+
(IC1, 2 B+)
D9
DC/DC
VT B+ B+ SWITCH
DCJ1
CONVERTER
(FOR L.P.F. CIRCUIT) Q8
Q4, 5, T2 DC IN 3V
–
DC/DC
RDS B+ B+ SWITCH
DRY BATTERY
CONVERTER
(IC3 B+) Q6
SIZE "AA"
IC4
(IEC DESIGNATION R6)
2PCS. 3V
– 12 –
4-2. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
Note on Printed Wiring Board:
• X : parts extracted from the component side.
• Y : parts extracted from the conductor side.
• W : indicates side identified with part number.
• r
: Through hole.
• ¢ : internal component.
• b : Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
Caution:
Pattern face side: Parts on the pattern face side seen from
(Conductor Side) the pattern face are indicated.
Parts face side: Parts on the parts face side seen from
(Component Side) the parts face are indicated.
+
ICF-M33RDS
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ω and
1
/ W or less unless otherwise
4
specified.
¢
• : internal component.
• C : panel designation.
• U : B+ Line.
• H : adjustment for repair.
• Power voltage is dc 3 V and fed with regulated dc power
supply from battery terminal.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
( ) : AM (LW)
∗
: Impossible to measure
• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F
: FM
f : AM (LW)
– 13 –