Sony CDX-L440B Service Manual ▷ View online
17
17
CDX-L440B
3-4. BLOCK DIAGRAM — DISPLAY SECTION —
KEY MATRIX
S501-511,
S512-521
KEY
ACTIVE
Q916
X802
32.768kHz
37
38
40
41
29
18
20
19
30
43
47
SYSTEM CONTROL
IC801 (3/3)
LCD DRIVER
IC551
KEY 0
DATA
CLK
CE
LCD DO
LCD CLK
LCD CE
ILL POWER
CONTROLLER
Q914
INITIAL
RESET
D552
SWITCH
Q915
ILL + B
KEY 1
KEY 1
KEY 0
KEY ACK
AD ON
XT2
XT1
X2
48
ILL ON
BATT
X1
X801
8.38MHz
LED501-504
D561-581
LCD BACK
LIGHT
62
61
60
COM1
COM2
LCD
LCD501
D914
(
)
KEY
ILLUMINATION
(
)
64
•
63
1
|
23
•
25
|
53
•
SEG1
SEG52
|
DATA
CLK
CE
ILL+B
57
INH
3-5. CIRCUIT BOARDS LOCATION
MAIN board
tuner unit
(TU601)
(TU601)
DISPLAY board
SERVO board
IN SELF SW board
SPEAKER board
SL SW board
—
Main Board
—
1
2
32.768kHz
IC801
ej
(XT2)
3.8Vp-p
5Vp-p
8.38MHz
IC801
r;
(X2)
• Waveforms
— Servo Board —
(MODE: CD PLAY)
1
2
3
IC1
ts
(PACK)
IC1
uj
(RFO)
1.2Vp-p
4
Approx. 1Vp-p
IC1
oa
(FEO)
0V
5
Approx. 400mVp-p
IC1
od
(TEO)
4.4Vp-p
16.9344MHz
IC1
wd
(XTAL)
3Vp-p
0V
22.7µsec
18
18
CDX-L440B
3-6. PRINTED WIRING BOARD — CD MECHANISM SECTION — • Refer to page 17 for Circuit Boards Location.
1
A
B
C
D
E
F
G
H
I
J
2
3
4
5
6
7
8
9
10
11
12
13
14
SW1
CN2
THIS NOTE IS COMMON FOR PRINTED WIRING
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is
printed in each block.)
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is
printed in each block.)
for schematic diagram:
• 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.
•
%
: indicates tolerance.
•
f
: internal component.
•
C
: panel designation.
•
A
: B+ Line.
• Power voltage is dc 14.4V and fed with regulated dc power
supply from ACC and BATT cords.
• 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.
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F
: FM
f
: AM
J
: CD
for printed wiring boards:
• X
: parts extracted from the component side.
• Y
: parts extracted from the conductor side.
•
a
: Through hole.
•
: Pattern from the side which enables seeing.
(The other layer’s patterns are not indicated.)
Caution:
Pattern face side: Parts on the pattern face side seen from the
(Side B)
Pattern face side: Parts on the pattern face side seen from the
(Side B)
pattern face are indicated.
Parts face side:
Parts on the parts face side seen from the
(Side A)
parts face are indicated.
Note: The components identified by mark
0
or dotted line
with mark
0
are critical for safety.
Replace only with part number specified.
19
19
CDX-L440B
1
A
B
C
D
E
F
G
H
I
J
2
3
4
5
6
7
8
9
10
11
12
13
14
TP8
C45
C4
C26
C37
TP6
TP1
TP2
TP4
TP5
TP87
TP86
TP57
TP77
TP11
TP79
TP83
TP70
TP9
TP27
TP12
TP78
TP10
TP81
TP84
TP54
TP25
TP24
TP37
TP39
TP36
TP38
TP40
TP45
TP22
TP88
TP41
TP46
FB3
TP21
TP17
TP20
TP42
TP19
TP28
TP90
C41
TP29
C44
TP73
TP32
TP48
TP71
TP51
TP49
TP52
TP55
TP75
TP53
TP56
TP43
TP58
TP61
TP74
TP68
TP80
TP7
TP62
TP91
TP63
C40
TP66
TP64
TP69
TP72
TP50
TP26
TP3
TP59
TP76
TP18
TP89
TP30
R8
R9
R5
R7
R12
R14
R15
R10
R17
R18
R19
R20
R22
FB6
FB7
FB1
FB2
TP92
FB4
C3
C5
C6
C8
C9 C10
C11
C13
C14
C16
C18
C19
C24
C25
C29
C34
C36
C38
C35
C21
C22
C30
C23
C1
C27
R21
TP47
C15
C20
TP35
TP23
R24
R6
C17
TP82
TP44
Q1
R26
TP34
R25
R3
TP16
TP85
IC1
IC2
C43
R30
R29
X1
TP60
CN3
CN1
SW3
SW2
SW4
CN13
M901
M903
M902
(Page 21)
Ref. No.
Location
IC1
E-7
IC2
H-7
Q1
C-6
• Semiconductor
Location
20
20
CDX-L440B
IC B/D
IC B/D
TP77
TP78
TP78
R29
R30
R30
C43
TP79
TP80
TP80
TP81
TP82
TP83
TP84
TP82
TP83
TP84
CN2
CN3
TP85
M902
M901
SW2
TP4
TP2
TP2
TP3
M903
TP87
TP86
TP9
TP8
R3
R26
C4
TP10
C13
R5
C11
C10
C8
TP7
TP92
R6
TP17
TP20
TP16
TP19
TP20
TP16
TP19
R25
TP21
TP18
TP18
R24
R7
TP6
C17
FB1
TP11
TP12 C9
C14
TP89
C19
C20
C23
R9
R8
TP22
TP23
TP24
TP25
TP88
FB4
C26
TP32
R14
R15
TP30
R12
R10
TP91
C37
TP90
TP29
TP28
TP26
TP27
R21
R22
TP34
TP35
TP36
TP46
TP37
TP38
TP39
TP40
TP41
TP42
TP43
TP44
TP45
FB2
CN1
R18
R19
R20
R17
TP66
FB7
FB6
TP62
TP47
TP63
TP48
TP49
TP64
TP50
TP51
TP52
TP68
TP53
TP69
TP54
TP70
TP55
TP71
TP56
TP72
TP57
TP73
TP58
TP74
TP59
TP75
TP60
TP76
TP61
X1
SW3
SW4
CN13
Q1
IC2
FB3
IC1
SW1
TP1
TP5
TP5
C44
C40
C1
C5
C3
C6
C15
C16
C24
C38
C36
C25
C29
C34
C45
C27
C41
C22
C21
C30
C18
C35
(Page 23)
Note:
• Voltage and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : CD PLAY
no mark : CD PLAY
3-7. SCHEMATIC DIAGRAM — CD MECHANISM SECTION — • Refer to page 17 for Waveforms and refer to page 26 for IC Block Diagrams.
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