Sony CX-LEM400 / XR-EM400 Service Manual ▷ View online
29
CX-LEM400
VCC
VCC
VCC
LD
CLK
DI
GND
AO1
AO2
AO3
VCC
R-2R
DA
C
R-2R
DA
C
R-2R
DA
C
8bitREG
+
DEC
8bitREG
+
DEC
8bitREG
+
DEC
Po
w
e
r o
n
reset
Ser
ial
Interf
ace
1
2
3
4
8
7
6
5
1
DIR
2
A1
18
B1
3
A2
17
B2
4
A3
16
B3
5
A4
15
B4
6
A5
14
B5
7
A6
13
B6
8
A7
12
B7
9
A8
10
GND
11
B8
19
G
20
VCC
– SUB CONTROL Board –
IC804
TC74HC245AF (EL)
IC805
BH2220FVM-TR
30
CX-LEM400
6-11.
IC PIN FUNCTION DESCRIPTION
• IC801
LC876780B-52C5-E (SYSTEM CONTROLLER)
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30 to 36
37 to 44
45
46
47 to 50
51
52 to 66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
I/O
O
—
I
O
I
O
I
O
O
O
I
I
O
—
I
O
—
I
I
I
I
I
I
I
O
I
I
—
I
—
O
O
—
O
—
O
I
I
I
O
I
O
O
O
O
O
O
O
O
O
Pin Name
LD
NC
SCOR
TA SOL
TA END
TA MOTOR
RDS-DATA
POWER ON
AMP-MUTE
F-DATA
RST
32.768kHz
32.768kHz
GND
8.64MHz
8.64MHz-EXTAL
VDD1
KEY1
KEY2
I POWER DOWN
VERSION
VOL-ENC
FM-SIGNAL
TA SW
SHT-CLK
I POWER MONITOR
RDS-CLK
NC
RMC
NC
G1 to G8
SEG1
VDD3
SEG2 to SEG5
NO-USE
SEG6 to SEG20
TA PLAY.SW
C-DOOR
MIACK
BASS+2
MIDIO2
VDD3
MIDIO1
TA BIAS
ECO.LED
MP3RST
TA REC/PB
AMP-STNBY
MICK
TU MUTE
Description
Serial data load signal output to the D/A converter (IC805)
Not used (open)
SCOR (SUBQ request) signal input from the DSP (IC101)
Solenoid control signal output to the tape deck
Tape deck reel switch signal input
Motor control signal output to the tape deck
RDS data input from the tuner
Power relay control signal output
Not used
Control signal output to the sound processor
Reset signal input from the reset IC (IC803)
Resonator terminal (32.768kHz)
Resonator terminal (32.768kHz)
Ground terminal
Resonator terminal (8.64MHz)
Resonator terminal (8.64MHz)
Power supply terminal
Key AD input 1
Key AD input 2
Power down detection signal input
Version setting terminal
Encoder signal input from the volume encoder
RDS signal level input from the tuner
Tape PACK switch status signal input from the tape deck
Clock shift control signal output
AC detection signal input
RDS clock input from the tuner
Not used (open)
Remote sensor signal input
Not used (open)
Grid signal output to the fluorescent indicator tube
Segment signal output to the fluorescent indicator tube
Power supply terminal
Segment signal output to the fluorescent indicator tube
Ground terminal
Segment signal output to the fluorescent indicator tube
Play switch signal input from the tape deck
CD door open/close switch signal input
Acknowledge signal input from the MP3 decoder (IC104)
Not used (fixed at “H”)
Data input from the MP3 decoder (IC104)
Power supply terminal
Data output to the MP3 decoder (IC104)
Bias control signal output to the bias oscillation circuit
ECO LED control signal output
Reset signal output to the MP3 decoder (IC104)
REC/PLAY control signal output to the REC/PLAY switch circuit
Standby control signal output to the power amplifier
Clock output to the MP3 decoder (IC104)
Muting signal output to the tuner
31
CX-LEM400
Pin No.
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
I/O
O
O
I
O
O
O
O
O
—
—
I
I
I
I
O
O
O
O
I
O
Pin Name
MICS
CD
MP3REQ
TU CE
XRST
XLT
DATA
SQCK
GND
VDD2
SUBQ
TU STEREO
TU TUNED
SENS
RFSW
MILP
CLK
TU DATA
TU COUNT
TU CLK
Description
Chip select signal output to the MP3 decoder (IC104)
CD power supply control signal output
Request signal input from the MP3 decoder (IC104)
Tuner chip enable signal output to the tuner
Reset signal output to the DSP (IC101)
Latch signal output to the DSP (IC101)
Data output to the DSP (IC101)
SUBQ clock output to the DSP (IC101)
Ground terminal
Power supply terminal
SUB-Q data input from the DSP (IC101)
Stereo/mono detection signal input from the tuner
Tuner tuned status signal input
SENS signal input from the DSP (IC101)
LD ON signal output to the RF amplifier (IC103)
Latch pulse output to the MP3 decoder (IC104)
Clock output to the DSP (IC101)
Seial data output to the tuner and the D/A converter (IC805)
IF count signal input from the tuner
Serial clock output to the tuner and the D/A converter (IC805)
SECTION 7
EXPLODED VIEWS
NOTE:
•
-XX, -X mean standardized parts, so they may
have some differences from the original one.
have some differences from the original one.
•
Items marked “*” are not stocked since they
are seldom required for routine service. Some
delay should be anticipated when ordering these
items.
are seldom required for routine service. Some
delay should be anticipated when ordering these
items.
•
The mechanical parts with no reference number
in the exploded views are not supplied.
in the exploded views are not supplied.
The components identified by mark
0
or
dotted line with mark
0
are critical for safety.
Replace only with part number specified.
32
CX-LEM400
1
A-4748-828-A MAIN BOARD,COMPLETE
2
4-812-134-31 RIVET (DIA. 3.5), NYLON
3
4-245-014-81 CABINET REAR
0 4
1-769-744-52 CORD, POWER
5
1-860-065-11 POWER BOARD
6
1-693-619-11 TUNER (FM/AM)
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
0 T902
1-439-782-11 TRANSFORMER, POWER
#1
7-685-647-79 SCREW +BVTP 3X10 TYPE2 N-S
#3
7-685-647-11 SCREW +B3X10
#6
7-685-650-79 SCREW +BVTP 3X16 TYPE2 N-S
#7
7-685-246-14 SCREW +KTP 3X8 TYPE2 NON-SLIT
7-1. CABINET SECTION
5
#6
#7
#1
#1
front panel section
#1
#1
#1
#1
#1
1
6
3
4
2
#7
#1
CD cabinet section
#1
#1
#1
#3
#1
#1
#7
#7
not supplied
not supplied
not
supplied
not
supplied
not
supplied
not
supplied
not
supplied
T902
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