Sony ICF-CD873 Service Manual ▷ View online
– 13 –
Adjustment Location and Connecting Points:
T1 AM IF Adjustment
CT401 Main Clock Adjustment
RV501 Focus Bias Adjustment
RV502 Focus Gain Adjustment
RV1 FM VCO Adjustment
AM Frequency Coverage
Adjustment
Adjustment
L4
L2 FM Frequency Coverage
Adjustment
L3
CT2
CT2
AM Tracking Adjustment
CT1
L1
L1
FM Tracking Adjustment
– MAIN BOARD (Component Side) –
– MAIN BOARD (Conductor Side) –
BP (CD TEST AUTO)
BP (FEO)
BP (CD TEST MANUAL)
TP8
(VCO)
(VCO)
TP7
(+B)
(+B)
TP12 (FM IN)
TP504 (VREF)
TP53 (VT )
TP503 (RF)
TP (+5 V)
C429
TP GND
(SHIELD)
(SHIELD)
TP401
(4.194 MHz)
+
ICF-CD873
– 15 –
– 16 –
SECTION 6
DIAGRAMS
6-1.
BLOCK DIAGRAM – CD Section –
A
B
D
12
13
4
10
7
11
6
F
E
C
DETECTOR
36
35
27
26
18
17
2
SL-OUT+
SL-OUT–
SLO
F-OUT–
F-OUT+
T-OUT+
T-OUT–
SPINDLE
MOTOR DRIVE
M571
(SPINDLE)
S570
(LIMIT)
SLED
MOTOR DRIVE
1
M570
(SLED)
FOCUS
COIL DRIVE
TRACKING
COIL DRIVE
SP-OUT+
SP-OUT
MUTE
SP-OUT–
10
15
14
3
25
19
F-IN
T-IN
SL-IN
SP-IN
SP-IN
SLP
FOCUS/TRACKING COIL DRIVE,
SPINDLE/SLED MOTOR DRIVE
IC503
16
14
SLED
AMP
LD
PD
LASER DIODE
OPTICAL PICK-UP
(KSS-213B)
2-AXIS
DEVICE
(FOCUS)
(TRACKING)
31
30
25
36
23
21
19
20
22
RF AMP,
FOCUS/TRACKING
SERVO
IC501 (1/2)
FOCUS OK
COMPARATOR
MIRR
AMP
DEFECT
AMP
FOCUS OK
AMP
IIL DATA REGISTER
30
31
FILTER
34
29
FILO
PCO
CLTV
FILI
XPCK
DIGITAL PLL
ASYMMETRY
CORRECTION
CORRECTION
EFM
DEMODULATOR
DIGITAL
OUT
ERROR
CORRECTOR
16K
RAM
INTERNAL BUS
SUB-CODE
PROCESSOR
CLOCK
GENERATOR
SERVO AUTO SEQUENCER
DIGITAL
CLV
17
15
44
46
42
16
8
4 5
7
9 11 10
1
2
3
6
73
14
13
38
39
33
34
1
37
42
2
44
12
11
6
24
23
13
PHD1
PD1 I-V AMP
RFO
RF
38
ASYI
39
50
ASYO
FOK
DATO
CLKO
XLTO
SEIN
CNIN
MDP
SQSO
SQCK
SENS
DATA
CLOK
XLAT
XLON
B+
(CD 5V)
D414
SPOA
SCOR
SBSO
EXCK
XUGF
WFCK
EMPH
EMPHI
MUTE
XTAI
74
XTAO
RFI
FOK
DATA
CLK
SENS
C.OUT
XLT
PD2 I-V AMP
PHD2
TTL
IIL
FEO
TEO
PHD
40
EI
FEI
FEO
TAO
TEI
TTL
IIL
TTL
IIL
XRST
FOCUS
ERROR
AMP
RV501
FOCUS
GAIN
RV502
FOCUS
BIAS
RF
SUMMING
AMP
TRACKING
ERROR
AMP
TRACKING PHASE
COMPENSATION
E-F BALANCE
CONTROL
Q501
FOCUS PHASE
COMPENSATION
AUTOMATIC
POWER CONTROL
Q502
E I-V
AMP
AMP
F I-V
AMP
AMP
LD
AMP
PD
AMP
FE BIAS
F
E
LD
PCMD
70
LPWM
69
NLPWM
78
RPWM
77
NRPWM
61
DOUT
BCK
LRCK
PCMDI
BCKI
LRCKI
45
47
43
54
C2PO
SLED SERVO
IC501 (2/2)
05
DIGITAL SIGNAL PROCESSOR,
CLV SERVO, D/A CONVERTER
IC502
SYSTEM CONTROLLER
IC401 (1/2)
• SIGNAL PATH
: CD PLAY
25
MDS
26
MON
24
LOCK
27
CPU INTERFACE
D/A INTERFACE
DIGITAL FILTER &
1 BIT D/A CONVERTER
LOW-PASS
FILTER
IC301
64
62
63
XTSL
21
C4M
60
CD L-CH
GFS
X501
16.933MHz
51
49
CD R-CH
9
8
14
3
10
7
12
5
14
3
15
2
13
4
16
1
5
CN501
1
1
3
2
CN502
BH570
+
MAIN BOARD (1/3)
PUSH SWITCH BOARD
MOTOR BOARD
M
5
4
4
3
6
5
7
6
M
XRST
A
(Page 19)
DATA, CLOCK, LATCH
B
(Page 18)
DATA 40
R-LAT
DATA
CLOCK
LATCH
37
SCOR
DOOR-IN
BP
(CD TEST MANUAL)
44
62
XL
T
31
CLOCK
30
D
ATA
32
SENS
42
CK
39
SQSI
41
34
CIN
43
CD ADJ
29
X-RESET
22 18
SPOB
19
SPOC
20
7
S424
(CD LID OPEN/CLOSE DET)
ICF-CD873
– 17 –
– 18 –
6-2.
BLOCK DIAGRAM – TUNER Section –
18
20
16
13
24
15
11
12
22
FM
FRONT-END
AM
FRONT-END
MAIN CONTROL
PRESCALLER
PHASE
DETECT
OUTPUT
CONTROL
IF
COUNTER
I/O CONTROL
REGISTER
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
L.P.F.
PD1
14
FM RF
IN
IN
19
AM RF
IN
IN
FM/AM
FE OUT
CF2
10.7MHz
CF3
10.7MHz
CF1
450kHz
FM RF
26
FM
DISCRI
FM
IF IN
IF IN
4
ST IND
12
TUN IND
FM VCO
RV1
3
AM
IF IN
IF IN
PILOT DET
LPF1
7
VCC
15
BAND SELECT
B+
(FM/AM RF/OSC CIRCUIT)
B+
(5V)
21
REG
29
PLL LPF2
27
VCO
1
PLL LPF1
2
PILOT DET
LPF2
AM OSC
FM OSC
FM/AM FRONT-END,
FM/AM DET, MPX
IC1
FM/AM PLL
IC50
L2
FM FREQUENCY
COVERAGE
L4
AM FREQUENCY
COVERAGE
T1
AM IF
CT1, L1
FM TRACKING
CT2, L3
AM TRACKING
B.P.F.
BPF1
LOW-PASS
FILTER
Q50, 51
• SIGNAL PATH
: FM
: AM
05
L3
AM FERRITE-ROD
ANTENNA
L1
FM RF
CT1
D2
CT2
L4
AM OSC
L2
FM OSC
TUNER L-CH
TUNER R-CH
L-CH OUT
ANT1
FM WIRE
ANTENNA
6
R-CH OUT
5
D3
D4
(1/2)
D4
(2/2)
MAIN BOARD (2/3)
C
(Page 19)
TUNER ON
DATA, CLOCK, LATCH
D
(Page 19)
B
(Page 16)
X50
75kHz
P1
P0
IF IN
D
ATA
CLOCK
LA
TCH
XOUT
D
ATA
CLK
CE
FM IN
AM IN
PD1
5 4 3
1
XIN
2
8
7
9
ICF-CD873
– 19 –
– 20 –
– 21 –
6-3.
BLOCK DIAGRAM – MAIN Section –
POWER AMP
(FOR MEGA BASS SPEAKER)
IC351
POWER AMP
(FOR FRONT SPEAKER/HEADPHONE)
IC350
CD/TUNER SELECT SWITCH
IC320
CSV (COMPUTER SOUND VOICE)
PROCESSOR
IC601
05
A
(Page 16)
T901
POWER
TRANSFORMER
AC IN
•
SIGNAL PATH
: CD PLAY
: TUNER (FM/AM)
SHIFT CK
Q402
Q401, 402
SHIFT CLOCK
Q401
X402
4.194MHz
CD 5V
(CD SECTION B+)
TUNER SECTION B+
5V
VT B+
RESET
POWER AMP
(IC350, 351) B+
SW
X2
X1
60
59
58
68
CD ON
36
AC IN
38
8
12
3
CD
L-CH/R-CH
L-CH/R-CH
CD L-CH
CD R-CH
B+
(CD 5V)
TUNER
L-CH/R-CH
L-CH/R-CH
TUNER
L-CH
L-CH
TUNER R-CH
TUNER ON
C
(Page 18)
D
(Page 18)
MAIN BOARD (3/3)
LED BOARD
KEY BOARD
VOLUME BOARD
POWER BOARD
+5V
REGULATOR
Q901
+6V
REGULATOR
Q902
RECT
D905 – 908
LINE
FILTER
LF901
CD B+
SWITCH
Q903
RESET SIGNAL
GENERATOR
IC402
MUTING
Q120
MEGA BASS
MUTE
Q321
VOICE
MUTE
Q350, 351
10
5
CN301
(1/2)
1
2
CN302
(1/2)
7
6
CN303
(1/2)
4
2
CN401
3
5
7
9
CN402
8
6
4
2
CN302
(2/2)
5
2
3
1
J301
(HEADPHONE)
2
HEADPHONE
BOARD
CN303
(2/2)
6
7
9
3
5
CN304
(2/2)
5
4
D911
D415
X401
32.768kHz
XT2
XT1
56
55
SEG1 – SEG21
LIQUID CRYSTAL DISPLAY
LCD401
70 – 80, 1 – 10
COM0 – COM2
21 – 23
SYSTEM CONTROLLER
IC401 (2/2)
MUTING CONTROL
SWITCH
Q320
Q353
SPEAKER SWITCH
MUTE
MUTING
Q220
CSV (IC601): US model only
Q151
Q151, 251
SPEAKER ON
SWITCH
Q251
IN+
IN–
OUT
OUT
IN2
IN1
POWER ON
BUZZER
V MUTE
BASS ON
VOL OUT
VOL IN
R-CH
L-CH
–1
–2
D321
D320
D417
8
10
OUT2
OUT1
3
1
11
8
1
4
10
9
2
3
12
6
13
5
D350
D351
B+
(
µ
5V)
D422 – 424
(LCD BACK LIGHT)
D419 – 421
(LCD BACK LIGHT)
Q602
Q403
Q404
Q403 – 405
LED DRIVE
Q601
Q405
B+
(
µ
5V)
B+
(
µ
5V)
Q601, 602
ATTENUATE
SWITCH
X601
4.19MHz
XT
A MUTE
V MUTE
52
2
3
35
53
MEGA BASS ON
DRIVE
Q406
D416
MUTING CONTROL
SWITCH
Q407
MAIN
CLOCK
CT401
CT401
BASS ON
POWER ON
49
BUZZER
46
DATA
47
CLK
48
LAT
50
51
NAR
61
15
23
14
8
17
22
20
BUSY/COLOR
SO
AOUT
(US)
(EXCEPT US)
(EXCEPT US)
(US)
(US)
SI
NAR
20
KEY MATRIX
S401 – 420
D401
D404
KS0 – KS3
VERSION1
KS0
KS1
KS2
KS3
D403
D402
17
ALARM
19
CN301
(2/2)
3
6
5
7
POWER ON
MUTE DRIVE
Q904
HEADPHONE
MUTE DRIVE
MUTE DRIVE
Q352
HEADPHONE
MUTE
Q150, 250
SPEAKER
SWITCH DRIVE
Q354, 355
CN306
4
1
3
2
CN304
(1/2)
6
8
10
9
2
1
RV301
VOLUME
RV302
MEGA BASS
+
+
+
SP201
R-CH FRONT
SPEAKER
SP101
L-CH FRONT
SPEAKER
KH301
1
2
CN305
1
2
3
4
6
SP301
MEGA BASS
SPEAKER
BUSY
RST
ST
XT
S422
SOUND LEVEL
S423
BRIGHTNESS
LOW
MID
HIGH
S421
SOUND MODE
RIVER
BIRD
BUZZER
LOW
HIGH
13 – 16
KEYRET0 – KEYRET4
63 – 67
D408 – 411, 418
(Refer to NOTE 1.)
D408
D409
D410
D411
D411
D418
NOTE 1
D405
D406
D407
10
8
6
4
1
3
5
7
KR0
KR1
KR2
KR0
KR1
KR2
KR3
KR4
KR0
KR1
KR1
KR2
Australian model
Italian model
Italian model
US model
Canadian model
All models
All models
KR3
2
9
KR4
RECT
D903, 904
RECT
D901, 902
µ
5V
SYSTEM CONTROLLER (IC401),
CSV (IC601) B+
CD 6V
MOTOR/COIL
DRIVER (IC503) B+
BP
(CD TEST AUTO)
V-RESET
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