Sony ICF-CD843L Service Manual ▷ View online
ICF-CD843L
13
13
5-2. BLOCK DIAGRAM – TUNER Section –
CF1
10.7MHz
FM/AM PLL
IC51
CT1, L1
FM TRACKING
LOW-PASS
FILTER
LOW-PASS
FILTER
• SIGNAL PATH
: FM
: MW/LW
X51
75kHz
L1
FM RF
XOUT
XIN
AM IN
A OUT
A IN
FM IN
20
19
11
12
18
BO2
6
CT1
D2
SWALLOW
COUNTER
UNIVERSAL
COUNTER
CCB
INTERFACE
REFERENCE
DIVIDER
UNLOCK
DETECT
12 BIT
PROGRAMMABLE
DIVIDER
PHASE
DETECTOR/
CHARGE PUMP
SHIFT REGISTER & LATCH
1/2
BO1
DI
CL
CE
PD
2
3
1
5
17
16
• R-ch is omitted due to same as L-ch.
DI
CLK
CE
R-CH
B
TU-L
C
DI, CLK, CE
18
20
16
13
24
22
FM
FRONT-END
AM
FRONT-END
FM IF AMP/
DISCRI
DECODER
AMP
SWITCH
TUNING
INDICATOR
STEREO/MONO
SELECT
FM/AM
SELECT
REGULATOR
1/2
CONTER
VCO
AM IF AMP/
DET
PD2
PD1
14
FM
ANT
ANT
19
AM RF
IN
IN
FM/AM
FE OUT
CF3
10.7MHz
CF2
450kHz
FM RF
26
DISCRI
FM
IF IN
IF IN
4
ST IND
3
AM
IF IN
IF IN
PILOT DET
LPF
15
BAND SW
21
REG
29
PLL LPF
27
VCO
1
PLL LPF
2
PILOT DET
LPF
AM OSC
FM OSC
FM/AM FRONT-END,
FM/AM DET, MPX
IC1
T1
AM IF
LCH OUT
6
RCH OUT
5
T1
AM IFT
RV1
FM STEREO
ANT1
FM
LEAD WIRE
ANTENNA
BPF1
BPF
L.P.F.
CT4
LW VCO
VOLTAGE
CT3, L3-2
LW
TRACKING
CT2, L3-1
MW
TRACKING
L3
MW/LW
FERRITE-ROD
ANTENNA
CT2
Q2
CT3
L3-2
(LW)
L3-1
(MW)
Q2
MW/LW
SWITCH
D5
(1/3)
D5
(2/3)
L4
MW VCO
VOLTAGE
CT4
L4
AM
OSC
Q3
LW
SWITCH
D5
(3/3)
(Page 14)
(Page 12)
ICF-CD843L
14
14
5-3. BLOCK DIAGRAM – MAIN Section –
60
POWER ON
52
BUZZER
61
A MUT
76
RESET
48
CD ON
RADIO ON 59
CD LED
RADIO LED
BUZZER LED
68
BACK LIGHT1
49
AC IN
SYSTEM CONTROLLER
IC401 (2/2)
L OUT 5
R OUT
STANDBY
3
8
NF R
13
R IN
12
NF L
10
L IN
11
AMP
Q102
BUFFER
Q108
AMP
Q101
MUTING
Q106
MUTING
Q405
B+ SWITCH
Q1
RV301
3.3V
R-CH
R-CH
R-CH
D303
Q301
VOLUME
S301
ON OFF
MEGA BASS
BASS BOOST
SWITCH
Q103
STANDBY
SWITCH
Q302, 303
+3.3V
REGULATOR
Q951
LIQUID CRYSTAL DISPLAY
LCD401
+6V
REGULATOR
Q952
+3.9V
REGULATOR
Q953
+3.9V
REGULATOR
Q955
POWER AMP
IC302
51
BUZZERMUTE
T901
POWER
TRANSFORMER
D601 – 603
LED 3.9V
D604 – 609
(LCD BACK LIGHT)
Q403,
Q404
Q404
SP101
(L-CH)
(L-CH)
SP201
(R-CH)
(AC IN)
RECT
D901, 902
VT
3.3V
MOTOR 6V
TU 3.3V
CD 3.3V
RECT
D905, 906
RECT
D907 – 910
B+ SWITCH
Q305
67
BACK LIGHT0
XT2
XT1
X2
X1
3.9V
LED 3.9V
RESET SIGNAL
GENERATOR
IC402
D402
70
71
X401
32.768kHz
74
75
X402
4.19MHz
78 – 80
KEY0 – KEY3
43 – 46
COM0 – COM3
6 – 9
SEG0 – SEG27
10 – 37
Q401,
Q402
Q402
Q401 – 404
LED DRIVE
LED DRIVE
S601 – 621
: CD PLAY
: FM
•
R-ch is omitted due to same as L-ch.
•
SIGNAL PATH
C
A
CD-L
TU-L
(Page 12)
(Page 13)
ICF-CD843L
15
15
Note on Printed Wiring Boards:
•
X
: parts extracted from the component side.
•
Y
: parts extracted from the conductor side.
•
W
: indicates side identified with part number.
•
f
: internal component.
•
: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
Caution:
Pattern face side:
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.
Note on Schematic Diagram:
•
All capacitors are in
µ
F unless otherwise noted. (p: pF)
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
•
All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
•
f
: internal component.
•
5
: fusible resistor.
•
C
: panel designation.
•
A
: B+ Line.
•
B
: B– Line.
•
H
: adjustment for repair.
•
Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
– CD Board –
no mark : CD STOP
[
under no-signal (detuned) conditions.
– CD Board –
no mark : CD STOP
[
] : CD PLAY
–Other Boards –
no mark : FM
(
no mark : FM
(
) : MW
〈〈
〉〉
: LW
[
] : CD PLAY
•
Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
•
Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
Voltage variations may be noted due to normal produc-
tion tolerances.
•
Circled numbers refer to waveforms.
•
Signal path.
F
: FM
f
: MW/LW
J
: CD PLAY
Note: The components identified by mark
0
or dotted line
with mark
0
are critical for safety.
Replace only with part number specified.
•
Circuit Boards Location
PRESET board
LCD board
LED board
ALARM board
MAIN board
CD board
TRANSFORMER board
VOLUME board
•
Note for Printed Wiring Boards and Schematic Diagrams
ICF-CD843L
16
16
M702
(SLED)
S701
(LIMIT)
C732
CNP701
X701
CNP702
C702
JW701 JW702
JW703
JW705
JW706
JW707
JW708
JW709
JW713
JW714
JW716
JW717
JW718
JW721
JW722
JW723
JW724
JW
725
JW726
JW727
JW728
JW729
JW730
C740
C750
C746
C747
JW719
C735
JW720
JW711
C733
C706
JW712
JW710
JW715
Q701
IC702
C729
C730
R730
R728
R729
C704
R708
C728
R724
R722
R725
R726
R707
C701
C726
C723
C725
C724
R719
R717
R718
R716
C720
C721
C722
R731
R721
R720
C716
R715
R714
C727
C711
C709
FB701
C736
C734
R709
C705
R704
R702
R711
R710
R703
R705
R701
C703
C731
R706
C738
C739
R727
R712
R723
C708
R741
JC701
R743
C751
JC702
C743
C744
C745
C742
C754
C755
C741
JC704
C707
L706
C717
R744
IC701
CD BOARD
A
MAIN BOARD
CN302
M
M
M701
(SPINDLE)
1-680-943-
13
(13)
C
D
E
F
G
H
1
2
3
4
5
6
7
8
A
B
TP
(GND)
TP
(RF)
OPTICAL
PICK-UP
BLOCK
(KSS-213R)
5-4. PRINTED WIRING BOARD – CD Board –
•
See page 15 for Circuit Boards Location.
:Uses unleaded solder.
(Page 18)
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