Sony CDC-R237 Service Manual ▷ View online
17
CDC-R237
• IC901 µPD178078GF-589-3BA (SYSTEM CONTROL) (MAIN BOARD)
Pin No.
Pin Name
I/O
Pin Description
1
BATT IN
I
Battery signal input
2
DFP IN
I
Front panel with/without detect signal input
3
LCD DI
I
LCD serial data signal input
4
LCD DO
O
LCD serial data signal output
5
LCD CLO
O
LCD sync clock signal output
6
LCD CE
O
LCD driver CE signal output
7
BBE1
O
Not used. (Open)
8
CDS DI
I
CDS serial data signal input
9
CDS DO
O
CDS serial data signal output
10
CDS CLO
O
CDS sync clock signal output
11 – 15
NC
O
Not used. (Open)
16
BBE2
O
Not used. (Open)
17
NC
O
Not used. (Open)
18
EVOL CLO
O
Clock signal output to electronic volume
19
EVOL DO
O
Serial data signal output to electronic volume
20
EVOL CE
O
CE signal output to electronic volume
21
LOC/DX
O
LOC/DX select signal output
22
DSSA CONT
O
DSSA control signal output “H”: DSSA L/R
23
ACC DETECTOR
I
Power supply overvoltage detect signal input
24
PHONE MUTE
I
External mute control signal input
25
LEVELIND
I
Level signal input
26
TEST
—
CDS test mode pin
27
AVDD
—
Power supply pin (+5 V)
28 – 30
NC
I
Not used. (Connect to ground.)
31
FM/AM S METER
I
RDS AF signal input/FM/AM S meter signal input
32
AVSS
—
Ground pin
33
REGCPU
—
Regulator for CPU power supply
34
VDD
—
Power supply pin (+5 V)
35
REGOSC
—
Regulator for oscillator circuit
36, 37
X2, X1
—
System clock oscillator pin (6.3 MHz)
38
GND
—
Ground pin
39
IF REQ
O
IF count signal request output
40
GND
—
Ground pin
41
AM IF
I
AM IF count signal input
42
FM IF
I
FM IF count signal input
43
VDD PLL
—
Power supply pin for PLL (+5 V)
44
FM OSC
I
FM local oscillator signal input
45
AM OSC
I
AM local oscillator signal input
46
GND PLL
—
Ground pin for PLL
47
EO 0
O
Error out signal output from charge pomp
48
EO 1
O
Error out signal output from charge pomp
49
IC
—
Not used. (Connect to ground.)
50
RESET
I
System reset signal input
51
RDS CLK IN
I
RDS clock signal input
52
ACC IN
I
ACC on/off detect signal input
53
NC
I
Not used.
54
ST IND/SD IN
I
FM receive stereo signal input
55
NC
O
Not used. (Open)
56
ST BY MUTE
O
ST-BY mute control signal output to power IC
57
POWER CONT
O
Power control signal output
58
RDS DI
I
RDS serial data signal input
59
BEEP
O
Beep signal output
18
CDC-R237
Pin No.
Pin Name
I/O
Pin Description
60
AF MUTE
O
Audio mute control signal output
61 – 63
NC
O
Not used. (Open)
64
RDS MODE
O
RDS mode signal output “H”: RDS AF
65
POWER MUTE
O
Mute control signal output to power IC
66
FM
O
Band (FM) select signal output
67
AM
O
Band (AM) select signal output
68 – 70
NC
O
Not used. (Open)
71
MI-1
I
Diode matrix input for initial setting
72
MI-2
I
Diode matrix input for initial setting
73
TEST MODE
I
Test mode pin for CD mechanism
74
MO-1
O
Diode matrix output for initial setting Not used. (Open)
75
MO-2
O
Diode matrix output for initial setting Not used. (Open)
76
MO-3
O
Diode matrix output for initial setting
77
MO-4
O
Diode matrix output for initial setting Not used. (Open)
78
EJECT
I
Disc eject interruption signal input
79
S REQ
I
CDS S-REQ signal input
80
RE1 IN
I
Rotary encoder signal input 1
81
RE2 IN
I
Rotary encoder signal input 2
82
GND
—
Ground pin
83
NC
O
Not used. (Open)
84, 85
PANCON 1, 2
O
Not used. (Open)
86
SW1
I
Switch signal input
87, 88
NC (SW2, 3)
O
Not used. (Open)
89
FLAP IN
O
Not used. (Connect to ground.)
90
MF CONT
O
Not used. (Open)
91, 92
SEN 1, 2
O
Not used. (Connect to ground.)
93
NC
O
Not used. (Open)
94
CDS RESET
O
CDS reset signal output
95
CDS SLEEP
O
CDS sleep signal output
96
CDS CS
O
CDS CS signal output
97
NC
O
Not used. (Open)
98
RADIO CONT
O
Radio control signal output
99
VDDPORT
—
Power supply pin (+5 V)
100
GND
—
Ground pin
19
19
CDC-R237
4-2. BLOCK DIAGRAM — CD SECTION —
(Page 20)
25
24
22
20
16
17
15
14
13
11
10
2
26
57
60
59
62
86
82
63
64
65
70
74
69
33
9
8
4
7
6
5
FOCUS
COIL
DRIVE
LD
DRIVE
Q221
TRACKING
COIL
DRIVE
SPINDLE
MOTOR
DRIVE
5V
REG.
8
9
20
M2
(SPINDLE)
M
M1
(SLED/LOADING)
M
-
+
+
-
FOCUS
COIL
TRACKING
COIL
VIN3
VIN3G
VIN4
VIN4G
VIN2
VIN2G
VIN1
REG IN
VIN1G
MUTE
VO3+
VO3-
VO4+
VO4-
VO2+
VO2-
VO1+
VO1-
REG
OUT
OUT
FOCUS/TRACKING COIL DRIVE,
SLED/SPINDLE/LOADING MOTOR DRIVE,
IC201
6
7
4
5
13
15
25
16
14
19
+5V REG
Q201
24
23
17
18
S3
(CHUCH)
S2
(DISC IN2)
S1
(DISC IN1)
S4
(LIMIT)
+5V
VC
1
2
3
4
5
6
7
8
9
10
11
13
12
15
14
FRI
RFI
RFZI
RFZI
FEI
RFCT
61 RFRP
SBAD
TEI
TEI
TEZI
TEBC
TEBC
SEL
RFGC
RFGC
P2-O/EMPH
78 XI
79 XO
66 FOO
67 TRO
28 P3-3(ADIN3)
72 DMO
26 LM CONT
71 FMO
TPI
TNI
FNI
MDI
LDD
19 VRO
RFGO
LO
RO
RFRPIN
RFCT
RFRP
FEO
FEN
FEN
SBAD
TEO
TEN
TEN
TEB
SEL
SEL
RFGC
GVSW
VREF
10
11
X241
16.9344MHz
DIGITAL SIGNAL SERVO PROCESSOR
IC241
RF AMP
IC221
23
P1-2(K2)
24
SW3
22
P1-1(K1)
CDS SRQ
SW1
CDS DI
CDS DO
CDS CLO
CDS CS
RESET
CD R
CD L
21
LIMIT SW
CD+5V
CD+8V
OPTICAL PICK-UP
BLOCK
MAIN
SECTION
A
SLED/
LOADING
MOTOR
DRIVE
SPEED
CONTROL
Q202
90
92
RESET
CS
32
31
CLOCK
SRQ
30
25
DATA OUT
DATA IN
• Signal path
:CD
20
20
CDC-R237
4-3. BLOCK DIAGRAM — MAIN SECTION —
(Page 19)
(Page 21)
1
16
AMANT
ANT101
(ANTENNA)
2 FMANT
TUN-RCH
LCH
17
RCH
22
SD/ST IND
TU101
(TUNER UNIT)
AUX-RCH
21
25
12
13
SYSTEM CONTROL
IC901
ELECTRONIC VOLUME
IC401
LROUT
20
EVOL CE
EVOL CLO
19
18
EVOL DO
60
AF MUTE
65
POWER MUTE
LSELO
LIN
LIN
LEVEL IND
MUX
DATA
XOUT
RDS DECODER
IC151
XIN
44 FMOSC
45 AMOSC
47 EO0
39 IF REQ
64 RDS MODE
54 ST IND/SD IN
LOC/DX
X1
RESET
58 RDS DI
4 ST-BY
22 MUTE
RL
FL
11
POWER AMP
IC501
2
CON851
R-CH
FL+
10
FL-
RL+
RL-
3
11
RR+
RR-
4
12
FR+
FR-
+B
7 ACC
+B
R-CH
BATT
PON+B
F901
6 ANT-R
17
19
18
16 BATT
56
ST BY MUTE
59
BEEP
24
PHONE MUTE
23
ACC DETECTOR
95
CDS SLEEP
50
16 AUX IN
L
J401
R
AUX(L)
TUN(L)
17
CD(L)
9
7
12
1
9
5
3
MUTE
Q403
AUDIO OUT
REAR
MUTE
Q401
4
LFOUT
DI
CE
CL
5
1
2
36
15
41 AM IF
31 FM/AM S METER
42 FM IF
11
AM/FM OSC
24
DET OUT
4
2
14
13
6
FMVT
14
AMVT
20
IF COUNT
21
SMETER
3
AM DX/LCL
4
FM DX/LCL
14
X901
6.3MHz
SW901
(RESET)
37
CDS RESET
94
CDS CS
96
CDS CLO
10
CDS DI
8
CDS DO
9
SREQ
79
SW1
86
CD R
CD-RCH
CD L
RESET
CDS CS
CDS CLO
CDS DO
CDS DI
CDS SRQ
SW1
36 X2
4
LCD DO
6
LCD CE
57
POWER CONT
2
DFP IN
3
LCD DI
80
RE1 IN
5
LCD CLO
81
RE2 IN
LCD DO
LCD CE
DFP IN
LCD DI
RE 1
LCD CLO
RE 2
1
1
BATT IN
2
IN
CD+8V
OUT
BATT
BATT
COM+9V
SW+8V REG
Q803,806-808
BATT DET
IC902
COM+9V
LAMP+B
PON+B
BATT
POWER
CONTROL
Q801,802
COM+9V REG
Q802,805
BU+5V
BATT
+5V REG
Q809,810
LEVEL AMP
Q451
VOL/
TONE
FADER
LPF(FM)
Q105,106
48 EO1
LPF(AM)
Q108,109
FM+B
FM+B
SWITCHING
Q103
COM+9V
AM+B
AM+B
SWITCHING
Q102
LOCAL
SWITCHING
Q101
BATT
SHUTDOWN
MUTE
Q501,502
MUTE
CONTROL
Q405,406
13 TEL MUTE
RL(+)
RL(-)
FL(+)
FL(-)
J601
AUX
FRONT
SECTION
B
CD
SECTION
A
66
FM
67
AM
CL
51 RDS CLK IN
16
X151 4.322MHz
SFR101
• Signal path
: CD
: FM
: AM
: AUX
• R-ch is omitted due to same as L-ch.
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