Sony ICF-CD831 / ICF-CD831L Service Manual ▷ View online
13
ICF-CD831/CD831L
IC701
C730
R729
R708
C716
C711
C709
FB701
C736
C734
R709
C705
R704
R702
R711
R710
R703
R705
R701
C703
C731
R706
R723
C708
JC703
C743
C744
C745
C742
C707
C717
C739
C738
TP
(VREF)
TP
(TE)
TP
(FE)
TP
(RF)
C732
TY
FY
TX
FX
JW706
JW707
JW708
JW709
JW724
JW726
C746
C747
TP
(RF)
TP
(VREF)
TP
(TE)
– CD board (conductor side) –
CD SECTION
CD section adjustments are done automatically in this set.
In case of operation check, confirm that focus bias.
In case of operation check, confirm that focus bias.
FOCUS BIAS CHECK
1. Connect the oscilloscope between IC701 pin 4 and pin qa (or
TP (RF) and TP (VREF)).
2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01)
3. Press the N X (CD) button.
4. Confirm that the oscilloscope waveform is as shown in the
3. Press the N X (CD) button.
4. Confirm that the oscilloscope waveform is as shown in the
figure below. (eye pattern)
A good eye pattern means that the diamond shape ( ) in the
center of the waveform can be clearly distinguished.
A good eye pattern means that the diamond shape ( ) in the
center of the waveform can be clearly distinguished.
• RF signal reference waveform (eye pattern)
Test Point:
RF level :
0.85
0.85
±
0.2 Vp-p
VOLT/DIV : 50 mV (10 : 1 probe in use)
TIME/DIV : 500 nS
TIME/DIV : 500 nS
When observing the eye pattern, set the oscilloscope for AC range
and raise vertical sensitivity.
and raise vertical sensitivity.
14
ICF-CD831/CD831L
MEMO
ICF-CD831/CD831L
15
15
SECTION 5
DIAGRAMS
5-2. CIRCUIT BOARDS LOCATION
5-1. IC PIN DESCRIPTION
• IC401 uPD789477GC-A28-8BT (SYSTEM CONTROL)
Pin No.
Pin Name
I/O
Pin Description
1 to 29
NC
—
Note used (Open)
30 to 37
SEG7 to SEG0
O
LED segment driver signal output
38
AVDD
—
Power supply pin (+3.3 V)
39
FSEQ
I
CD frame sync input
40
CD OPEN
I
CD open detection signal input
41
VERSION
I
Distination select signal input
42, 43
KEY1, KEY0
I
Key data input
44 to 46
SW2 to SW0
I
Switch data input
47
AVSS
—
Ground
48
NC
—
Not used (Open)
49
AC IN
I
AC power failure detection signal input
50
WRQ
I
CD write request data input
51
50/60HZ
I
LED display sync signal input
52
BUZZER
O
Beep sound output
53
CD DATA IN
I
CD serial data input
54
DATA
I/O
CD serial data input/ouput
55
CLK
O
CD serial clock signal output
56
LAT
O
CD latch signal output
57
DRF
I
CD DRF signal input
58
XRST
O
CD reset signal output
59
A MUT
O
Audio mute control signal output
60
POWER ON
O
Power AMP standby control signal output
61
BRIGHTNESS
O
LED brightness control signal output
62 to 68
SEG14 to SEG8
O
LED segment driver signal output
69
IC
—
Connecting to Ground
70
XT1
—
Sub system clock (32.768 kHz)
71
XT2
—
Sub system clock (32.768 kHz)
72
VDD0
—
Power supply pin (+3.3 V)
73
VSS0
—
Ground
74
X1
—
Main system clock (4.19 MHz)
75
X2
—
Main system clock (4.19 MHz)
76
RESET
—
System reset signal input
77
RADIO ON
O
Radio power supply control signal output
78
CD ON
O
CD power supply control signal output
79
CD/RADIO
O
CD/RADIO indicator drive signal output
80
NAP LED
O
NAP indicator drive signal output
MAIN board
DRIVE board
KEY (A) board
TRANSFORMER board
CD board
KEY (B) board
ICF-CD831/CD831L
16
16
5-3. BLOCK DIAGRAM — CD SECTION —
• Signal path
: CD
A
C
B
F
E
D
A
C
B
D
LD
PD
VR
F
T+
T–
F+
F–
F–
E
VREF
LD
PD
LD POWER
CONTROLLER
Q701
APC
FIN2
FIN1
LDD
LDS
TIN2
TIN1
VREF
RF
10
9
11
80
7
79
4
8
9
12
11
TRACKING
COIL
DRIVE
19
7
FOCUS
COIL
DRIVE
TIN
FIN
25
SLIN
SLED
MOTOR
DRIVE
3
SPINDLE
MOTOR
DRIVE
SPIN
VREF
OPIN
MUTE
T+
T–
17
18
F+
F–
26
27
SL+
SL–
2
1
SP+
SP–
TRACKING
COIL
FOCUS
COIL
OPTICAL PICK-UP
BLOCK
(KSS-213R)
M
M
M702
SLED
MOTOR
M701
SPINDLE
MOTOR
SLED/SPINDLE
MOTOR DRIVER,
TRACKING/FOCUS
COIL DRIVER
IC702
S701
(LIMIT)
EFMIN
HFL
AGC
PH(RFENV)
FE
TE
VREF
CONT1
FSEQ
CONT4
DRF
RES
DI
CE
CL
WRQ
DO
XOUT
XIN
LCHO
RCHO
12
11
9
5
7
8
3
10
4
6
CNP702
3
67
TDD
TD
FD
SP
SL
31
72 25
66
63 61 62
49
48
65 64
42
45
RF AMP,
SYSTEM SERVO PROCESSOR,
DIGITAL SIGNAL PROCESSOR
IC701
X701
16.93MHz
CLV,CAV
CONTROL
PLL
VCEC
SWITCH
ERROR
CORRECTION
AUDIO CD
A/D
CONVERTER,
SERVO
PROCESSOR
FRAME SYNC
DETECT,PROTECT
INSERT
EFM DECODER
INTERPOLATION
MUTE
&
ATTENUATION
DEEMPHASIS
8FS
DIGITAL
FILTER
&
1-bit DAC
LPF
SLICE
LEVEL
CONTROL
GENERAL
PURPOSE
PORT
COMMAND
INTERFACE
INTERFACE
CLOCK
GENERATOR
23
15
FD
SL
SP
TD
VREF
VREF
VREF
D/A
CONVERTER
PH/BH
20
FDD
SPDO
SLDO
21 22 23
14
2
+6V
CD+B
B
CD BOARD
SL+
SL–
SL–
SP+
SP–
MAIN
BOARD
CN501
(Page 18)
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