Sony ICF-CD823 Service Manual ▷ View online
— 9 —
CD TEST-1
FOCUS
OK
Auto adjustment
Rough servo
CD button
+button
BAND
button
OFF
button
CD
button
CD STOP
Servo ON
Sled maement
TEST MODE END
The second music
played back.
CD button
+button
BAND
button
OFF
button
1
2
3
4
5
jump has
been set?
been set?
Execntes the
setting of jump.
Sets the respective
setup valnes.
TRACKING
GAIN UP
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
N
N
CD TEST-2
FOCUS
OK
Rough servo
+button
+button
BAND
button
BAND
button
OFF
button
OFF
button
CD
button
CD
button
CD
button
CD STOP
Servo ON
Sled maement
TEST MODE END
The second music
played back.
Y
Y
Y
N
Y
Y
Y
Y
Y
Y
Y
— 10 —
SECTION 4
ELECTRICAL ADJUSTMENTS
FM VCO Adjustment
Procedure:
Procedure:
1. Connect the frequency counter to 4 and 7 pins of IC1 as shown
the figure right.
2. Tune the set to 98 MHz.
3. Adjust RV1 for 76 kHz Hz reading on frequency counter.
3. Adjust RV1 for 76 kHz Hz reading on frequency counter.
Specification Value:
FM RF signal
generator
generator
Carrier frequency: 98 MHz
Modulation: no modulation
Output level: 0.1 V (100 dB)
Modulation: no modulation
Output level: 0.1 V (100 dB)
0.01
µF
FM lead wire antenna terminal
Connection:
Adjustment Location:
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
T1
450 kHz
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
L4
530 kHz
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L3
600 kHz
CT2
1,400 kHz
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
done by the trimmer capacitors.
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
L2
87.5 MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L1
87.5 MHz
CT1
108.0 MHz
PRECAUTION
• Adjustment should be performed in the order given.
• Adjustment should be performed in the order given.
[FM]
Setting:
Function switch : RADIO
BAND switch
Setting:
Function switch : RADIO
BAND switch
: FM
[AM]
Setting:
Function switch : RADIO
BAND switch
Setting:
Function switch : RADIO
BAND switch
: AM signal
AM RF signal
generator
generator
30% amplitude modulation by
400 Hz signal.
Output level: as low as possible
400 Hz signal.
Output level: as low as possible
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
FM RF signal
generator
generator
75 kHz frequency deviation
by 1 kHz signal.
Output level: as low as possible
by 1 kHz signal.
Output level: as low as possible
0.01
µF
FM lead wire antenna terminal
level meter
set
J301 (phones)
32
Ω
+
–
–
TUNER SECTION
0 dB=1 µV
Frequency counter
75,500 – 76,500 Hz
IC1 Pin 4
+
–
–
frequency counter
33 k
Ω
MAIN Board
IC1 Pin 7
RV1
FM VCO Adjustment
FM VCO Adjustment
T1
AM IF Adjustment
AM IF Adjustment
CT2
AM Traking Adjustment
AM Traking Adjustment
L2
FM Frequency
Coverage Adjustment
FM Frequency
Coverage Adjustment
L4
AM Frequency
Coverage Adjustment
AM Frequency
Coverage Adjustment
L1
FM Tracking Adjustment
FM Tracking Adjustment
CT1
FM Traking
Adjustment
FM Traking
Adjustment
L3
AM Traking Adjustment
AM Traking Adjustment
[MAIN BOARD] (Component Side)
ICF-CD823
SECTION 5
DIAGRAM
Note on Printed Wiring Board:
• X : parts extracted from the component side.
• b : Pattern from the side which enables seeing.
• X : parts extracted from the component side.
• b : Pattern from the side which enables seeing.
Note on Schematic Diagrams:
• All capacitors are in µF unless otherwise noted. pF: µµF
• All capacitors are in µF unless otherwise noted. pF: µµF
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.
•
¢
: internal component.
• 2 : nonflammable resistor.
• C : panel designation.
• H : adjustment for repair.
• U : B+ Line.
• Voltages and waveforms are dc with respect to ground
• C : panel designation.
• H : adjustment for repair.
• U : B+ Line.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
( ) : AM
<
( ) : AM
<
> : CD
• Voltages are taken with a VOM (Input impedance 10 M
Ω).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Signal path.
F
: FM
f
: AM
J
: CD
• Abbreviation
CND : Canadian model
AUS
AUS
: Australian model
Note:
The components identi-
fied by mark
The components identi-
fied by mark
! or dotted
line with mark
! are criti-
cal for safety.
Replace only with part
number specified.
Replace only with part
number specified.
Note:
Les composants identifiés par
une marque
Les composants identifiés par
une marque
! sont critiques
pour la sécurité.
Ne les remplacer que par une
piéce por tant le numéro
spécifié.
Ne les remplacer que par une
piéce por tant le numéro
spécifié.
— 11 —
— 12 —
— 13 —
5-1. BLOCK DIAGRAM
5-2. CIRCUIT BOARD LOCATION
• Waveforms
0.2 V/DIV, 500 ns/DIV
1.0 V/DIV, 20
m
s/DIV
2.0 V/DIV, 40 ns/DIV
1
IC401 ud (XT1)
2
IC501 ed (RF0)
(PLAY MODE)
3
IC551 ua (XTA0)
3.4 Vp-p
31 ms
0.9 – 1.3 Vp-p
5.6 Vp-p
59 ns
KEY (UPPER) board
HEADPHONE board
MOTOR (6P) board
MAIN board
TRANSFORMER board
BACK LIGHT board
KEY (FRONT) board
: FM
: CD
• Signal Path
SYSTEM CONTROL
IC401
OPTICAL PICK-UP
BLOCK
(KSS-213C)
A
B
C
D
E
F
LD
VC
+5V
GND
PD
VR
LD
DRIVE
FOCUS
COIL
TRACKING
COIL
Q501
RF AMP
IC501
VC
51
PD1
38
PD2
39
E
42
F
41
LD
36
PD
37
MOTOR/COIL DRIVE
IC591
F+
26
F-
27
T+
17
T-
18
SL+
2
SL-
1
M
SLED
MOTOR
SP+
12
SP-
11
M
SPINDLE
MOTOR
F+
F-
T+
T-
25
19
3
24
FEM
7
SLO
16
TAO
13
FEO
6
DIGITAL SIGNAL PROC.
D/A CONV.
IC551
DIGITAL SERVO
RF
35
32
RFI
33
RFO
DATA
20
CLK
23
XRST
DATO
12
CLKO
14
67
L OUT1
74
L OUT2
7
DATA
9
CLK
8
XLAT
4
SQCK
57
SCOR
5
SQSO
71
XTAI
72
XTAO
17
XLDON MUTE
X501
16.9344MHz
C DATA
77
C CLOCK
75
C LATCH
76
C SQCK
56
C SQSO
54
C SENS
52
6
SENS
C MUTE
55
13
14
FM IF
AM IF
FM/AM
FRONT- END
15 BAND
C SCOR
49
(F IN)
SL IN
T IN
F IN
MAIN BOARD
ANT1
18
20
22
19
24
FM RF IN
FM RF OUT
FM OSC
AM RF
AM OSC
BPF1
B.P.F
3
1
IC1
CF3
10.7MHz
T1
AM IFT
MUTE
Q101
MUTE
CONT
Q302
Q302
S501
DOOR SW
22
21
XLT
XLTO
13
27
FOK
FOK
18
24
COUT
CIN
11
25
SENS1
SEIN
10
26
SENS2
76
A OUT2
65
A OUT1
SPOA(LIMIT)
15
62
SMUTE
R CLK
62
R LAT
63
RADIO ON
60
C SENS2
50
C RST
57
21 REG
D4
L3
MW ANT
L1
FM RF
CT1
L2
FM OSC
L4
AM OSC
RESET
IC402
IC51
PLL
FM IN
12
AM IN
11
PD
15
8
P1
5
DATA
4
CLK
3
LAT
2
1
X IN
X OUT
L.P.F
Q51,52
75kHz
X51
PLL +B
16
MIX OUT
CF2
450kHz
26
DISCRI
27
VCO
CF1
RV1
6
L OUT
5
R OUT
BUFFER
Q102
BUFFER
Q202
BUFFER
Q103
BUFFER
Q203
MUTE
Q201
RV301
VOLUME
BOARD
MOTOR(6P)
15
MDP
21
SP IN
7
MUTE
79
XRST
53
BUZZER
58
A MUTE
64
POWER ON
DOOR IN
47
LIMIT
SW
11
12
5
3
IC351
POWOR AMP
MUTE
Q353
MUTE
CONT
Q351,352
MUTE
Q354
J301
SP101
L
SP201
R
SPEAKER
HEADPHONE BOARD
+B SW
Q5
+5V
TU +B
R DATA
61
SEG0
SEG15
11
26
LIQUID CRYSTAL
DISPLAY PANEL
LCD401
COM0
COM3
7
10
KS0
KS2
35
37
FUNCTION
KEY
S701-713
BOARD
KEY(UPPER)
FUNCTION
KEY
S715-718
ALARM B
S720
RADIO
BUZZER
BOARD
KEY(FRONT)
DIAL
(ALARM)
S719,721-723
D402-404
BOARD
BACK LIGHT
38
KRO0
64
KR04
KR0
KR3
41
44
67
RESET
KRO1
KR03
32
34
D904-907
AC
IN
T901
POWER
TRANSFOMER
BOARD
TRANSFORMER
REG
Q902
REG
Q901
REG
Q301
PLL +B
CD +B
+5V
M +5V
IC402
D901,902
D903
D910
51
AC IN
59
CD ON
16
FM
TRACKING
AM
TRACKING
FM
FREQUENCY
COVERAGE
AM
FREQUENCY
COVERAGE
AM
IF
FM
VCO
(FM ANTENNA)
M571
M572
S570
AEP, Australian model
US, Canadian model
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ICF-CD823
— 14 —
— 15 —
— 16 —
5-3. SCHEMATIC DIAGRAM – MAIN SECTION (1/2) –
• Refer to page 13 for Waveforms.
• Refer to page 25 for IC Pin Function Description.
• Refer to page 26 for IC Block Diagrams.
Click on the first or last page to see other ICF-CD823 service manuals if exist.