Sony ICF-CD843L Service Manual ▷ View online
25
ICF-CD843L
11
10
9
8
7
6
5
4
3
2
1
12
13
14
15
16
19
20
UNLOCK
DETECTOR
POWER ON
RESET
UNIVERSAL
COUNTER
CCB
I/F
CE
DI
CL
DO
XOUT
AOUT
XIN
AIN
PD
VSS
VDD
B04
FMIN
AMIN
B01
B02
B03
I01
I02
IFIN
PHASE
DETECTOR
CHARGE
PUMP
REFERENCE
DIVIDER
SWALLOW
COUNTER
1/16,1/17
4BITS
12BITS
PROGRAMMABLE
DIVIDER
DATA SHIFT REGISTER
LATCH
1/2
17
18
VCO
REGULATOR
FM FRONT-END
AM FRONT-END
MPX
REGULATOR
MONO/STEREO
SELECT
DECORD
AMP
MUTING
AUTO
BLEND
TUNING
INDICATOR
AM IF/
DET
FM IF/
DISCRI
RIPPLE
FILTER
DETUNE
MUTING
MUTING
CONTROL
1
27
28
29
30
24
25
26
21
22
23
18
19
20
16
17
2
3
4
5
6
7
8
9
PLL LPF1
PILOT DET LPF2
PILOT DET LPF2
ST IND/VCO CHECK
L-CH OUT
VCC
R-CH OUT
RIPPLE FILTER
AGC AFC1
10
AGC AFC2
13
FM IF IN
14
AM IF IN
15
BAND SELECT
11
GND
12
TUNE IND
1/2
COUNTER
1/2
COUNTER
PD1
PD2
FM/AM FE OUT
FE GND
FM RF IN
AM RF IN
FM RF
REG
FM OSC
AFC
AM OSC
MUTE
FM DISCRI
GND
PLL LPF2
MPX REG
VCO
– MAIN Board –
IC1
CXA1238N-T4
IC51
LC72137M-TLM
IC302
BA5417
STANDBY
T.S.D.
BS
FILTER
PRE GND2
PRE GND1
NF2
IN2
IN1
NF1
FIL
TER
STBY
POWER GND
BS1
OUT1
VCC
OUT2
10
3 4 5
6
BS
BS2
2
NC
1
8
9
7
11 12
13
14 15
+
–
–
+
–
–
26
ICF-CD843L
•
IC Pin Function Description
LCD BOARD IC401
µ
PD789477GC-A12-8BT (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Description
1, 2
NC
—
Not used
3 to 5
VLC0 to VLC2
—
Terminal for doubler circuit capacitor connection to develop liquid crystal display drive voltage
6 to 9
COM0 to COM3
O
Common drive signal output to the liquid crystal display
10 to 37
SEG0 to SEG27
O
Segment drive signal output to the liquid crystal display
38
AVDD
—
Power supply terminal (+3.3V) (analog system)
39
CD OPEN
I
CD lid open/close detection signal input terminal “L”: CD lid is closed, “H”: CD lid is opened
40
VERSION
I
Destination setting terminal
41
FSEQ
I
Synchronizing signal detection signal input from the digital signal processor
42
NC
—
Not used
43 to 46
KEY1 to KEY4
I
Key input terminal (A/D input)
47
AVSS
—
Ground terminal (analog system)
48
CD ON
O
Power on/off control signal output terminal for the CD +3.3V power supply “L”: CD power on
49
AC IN
I
Power failure detection signal input terminal “L”: power failure, “H”: power on
50
WRQ
I
Interruption detection signal input from the digital signal processor
51
BUZZERMUTE
O
Buzzer sound muting on/off control signal output terminal “H”: muting on
52
BUZZER
O
Buzzer sound drive signal output terminal
53
LAT CD/RADIO
O
Chip enable signal output to the digital signal processor and FM/AM PLL
54
DATA CD/RADIO
O
Serial data output to the digital signal processor and FM/AM PLL
55
CLK CD/RADIO
O
Serial data transfer clock signal output to the digital signal processor and FM/AM PLL
56
DATA-IN CD
I
Serial data input from the digital signal processor
57
DRF
I
Focus on/off detection signal input from the digital signal processor
58
XRST
O
Reset signal output to the digital signal processor “L”: reset
59
RADIO ON
O
Power on/off control signal output terminal for the radio +3.3V power supply
“L”: radio power on
“L”: radio power on
60
POWER ON
O
Power amplifier on/off control signal output terminal
“L”: standby mode, “H”: power amplifier on
“L”: standby mode, “H”: power amplifier on
61
A MUT
O
Audio line muting on/off control signal output terminal “L”: muting on
62
HP SW
I
Connection detection signal input of the headphone jack
“L”: headphone connected, “H”: no headphone Not used
“L”: headphone connected, “H”: no headphone Not used
63
HP ON
O
Headphone on/off control signal output terminal “L”: headphone on Not used
64 to 66
NC
—
Not used
67
BACK LIGHT 0
O
LED drive signal output terminal for the liquid crystal display back light “L”: all LEDs on
68
BACK LIGHT 1
O
LED drive signal output terminal for the liquid crystal display back light “L”: half LEDs on
69
IC
—
Internal connection terminal
70
TX1
I
Sub system clock input terminal (32.768 kHz)
71
TX2
O
Sub system clock output terminal (32.768 kHz)
72
VDD0
—
Power supply terminal (+3.3V)
73
VSS0
—
Ground terminal
74
X1
I
Main system clock input terminal (4.19 MHz)
75
X2
O
Main system clock output terminal (4.19 MHz)
76
RESET
I
System reset signal input “L”: reset
For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”
For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”
77
NAP LED
O
LED drive signal output terminal for the NAP “L”: LED on Not used
78
CD LED
O
LED drive signal output terminal for the CD “L”: LED on
79
RADIO LED
O
LED drive signal output terminal for the RADIO “L”: LED on
80
BUZZER LED
O
LED drive signal output terminal for the BUZZER “L”: LED on
27
ICF-CD843L
SECTION 6
EXPLODED VIEWS
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
1
3-368-852-01 FOOT
* 2
1-684-046-12 PRESET BOARD
3
3-238-159-11 BUTTON (SNOOZE) (DATE/SLEEP OFF)
4
3-831-441-11 CUSHION (B)
5
X-2021-905-1 COVER ASSY
6-1.
CABINET SECTION
•
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.
•
Accessories are given in the last of the
electrical parts list.
electrical parts list.
NOTE:
•
-XX and -X mean standardized parts, so they
may have some difference from the original
one.
may have some difference from the original
one.
•
Color Indication of Appearance Parts
Example:
KNOB, BALANCE (WHITE) . . . (RED)
Example:
KNOB, BALANCE (WHITE) . . . (RED)
↑
↑
Parts Color
Cabinet's Color
The components identified by mark
0 or dotted line with mark 0 are
critical for safety.
Replace only with part number
specified.
0 or dotted line with mark 0 are
critical for safety.
Replace only with part number
specified.
6
3-254-142-01 SCREW (B3), (+) BV TAPPING
7
3-254-143-01 SCREW (B3), (+) BV TAPPING
8
3-254-143-11 SCREW (B3), (+) BV TAPPING
9
3-254-145-01 SCREW (B3), (+) BV TAPPING
1
front cabinet section
upper cabinet section
rear cabinet section
4
7
7
2
6
3
5
7
8
7
7
9
9
28
ICF-CD843L
6-2.
UPPER CABINET SECTION
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
51
3-922-112-31 DAMPER
52
3-238-155-41 CABINET (UPPER)
53
3-019-395-01 PLATE, CHUCKING
54
1-452-899-11 MAGNET
55
3-238-156-31 LID, CD
56
3-046-853-11 RUBBER, VIBRATION PROOF (GREEN)
57
3-046-853-01 RUBBER, VIBRATION PROOF (RED)
58
3-252-828-01 SCREW (B2.6), (+) PWH TAPPING
59
A-1060-974-A MAIN BOARD, COMPLETE
60
3-238-166-01 HOLDER (ANTENNA)
61
1-824-018-11 CABLE, FLEXIBLE FLAT (14 CORE)
62
3-238-173-01 SPRING (CD)
65
3-243-252-01 CUSHION (SP)
* 66
A-3347-089-A CD BOARD, COMPLETE
67
3-923-736-01 COVER, CD
68
1-757-689-11 CABLE, FLEXIBLE FLAT (16 CORE)
69
3-254-143-01 SCREW (B3), (+) BV TAPPING
70
3-253-143-01 SCREW (B2.6), (+) P TAPPING
ANT1
1-501-907-61 ANTENNA, FM WIRE
L3
1-428-952-21 COIL, FERRITE-ROD ANTENNA (MW)
S302
1-692-960-11 SWITCH, PUSH (1 KEY)
(CD LID OPEN/CLOSE DETECT)
#1
7-685-853-04 SCREW +BVTT 2X6 (S)
51
52
53
70
54
55
56
B
B
A
A
S302
L3
ANT1
MAIN board
Optical pick-up section
(KSM-213RDP)
(KSM-213RDP)
56
57
58
57
67
58
58
60
61
62
69
65
69
69
65
59
69
not supplied
#1
68
66
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