Sony ICF-CD855 / ICF-CD855L Service Manual ▷ View online
33
ICF-CD855/CD855L
– MAIN Board –
IC301
BD3870FS-E2
IC302
LA4627
1
STBY
2
OUT2
3
NC
4
PRE GND
5
NC
6
IN2
9
P.P
8
DC
7
IN1
VCC
OUT1
NC
POWER
AMP
RIPPLE
FILTER
+
–
–
POWER
AMP
REF
AMP
+
–
TSD
PROTECTOR
STANDBY SWITCH
POP SOUND
PROTECTION
BLOCK
12
11
10
34
ICF-CD855/CD855L
MAIN BOARD IC401
µ
PD789477GC-A39-8BT (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Description
1, 2
NC
—
Not used
3 to 5
VLC2 to VLC0
—
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
FSEQ
I
CD synchronizing signal detection signal input from the digital signal processor
40
CD OPEN
I
CD lid open/close detect switch input terminal “L”: CD lid is closed, “H”: CD lid is opened
41
DRF
I
CD focus on/off detection signal input from the digital signal processor
42
VERSION
I
Setting input terminal for destination
43 to 46
KEY3 to KEY0
I
Key input terminal (A/D input)
47
AVSS
—
Ground terminal (for analog system)
48
R CLK
O
PLL serial data transfer clock signal output to the FM/AM PLL
49
AC IN
I
Power detection signal input terminal when connected AC power adapter (A/D input)
50
WRQ
I
CD interruption signal input from the digital signal processor
51
MUTE
O
Tuner muting on/off control signal output to the FM/AM PLL “L”: muting on
52
BUZZER
O
Beep sound signal output terminal
53
CD DATA-IN
I
Serial data input from the digital signal processor
54
CD DATA
O
Serial data output to the digital signal processor
55
CD CLK
O
Serial data transfer clock signal output to the digital signal processor
56
CD CE
O
Chip enable signal output to the digital signal processor
57
R DATA
O
PLL serial data output to the FM/AM PLL
58
XRST
O
System reset signal output to the digital signal processor “L”: reset
59
R CE
O
PLL chip enable signal output to the FM/AM PLL
60
POWER ON
O
Power on/off control signal output terminal for the power amplifier
“L”: standby mode, “H”: power amplifier on
“L”: standby mode, “H”: power amplifier on
61
ALARM A BUZ
O
LED drive signal output terminal for ALARM A BUZZER indicator
62
ALARM A RADIO
O
LED drive signal output terminal for ALARM A RADIO indicator
63
ALARM A CD
O
LED drive signal output terminal for ALARM A CD indicator
64
VOL CLK
O
Serial data transfer clock signal output to the electrical volume
65
VOL DAT
O
Serial data output to the electrical volume
66
ALARM B BUZ
O
LED drive signal output terminal for ALARM B BUZZER indicator
67
ALARM B RADIO
O
LED drive signal output terminal for ALARM B RADIO indicator
68
ALARM B CD
O
LED drive signal output terminal for ALARM B CD indicator
69
IC
—
Ground terminal
70
XT1
I
Sub system clock input terminal (32.768 kHz)
71
XT2
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 from the reset signal generator “L”: reset For several hundreds msec.
after the power supply rises, “L” is input, then it changes to “H”
after the power supply rises, “L” is input, then it changes to “H”
77
AMUTE
O
Audio muting on/off control signal output terminal “L”: muting on
78
RADIO ON
O
Power on/off control signal output for the tuner section “L”: tuner power on
79
CD ON
O
Power on/off control signal output for the CD section “L”: CD power on
80
NC
I
Not used
•
IC Pin Function Description
35
ICF-CD855/CD855L
SECTION 7
EXPLODED VIEWS
• Items marked “*” are not stocked since they
are seldom required for routine service. Some
delay should be anticipated when ordering
these items.
delay should be anticipated when ordering
these items.
• The mechanical parts with no reference num-
ber in the exploded views are not supplied.
• Accessories are given in the last of the elec-
trical parts list.
NOTE:
• -XX and -X mean standardized parts, so they
may have some difference from the original
one.
one.
• Color Indication of Appearance Parts
Example:
KNOB, BALANCE (WHITE) . . . (RED)
KNOB, BALANCE (WHITE) . . . (RED)
↑
↑
Parts Color Cabinet's Color
7-1. OVERALL SECTION
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
1
3-246-344-11 FOOT, RUBBER
2
3-252-827-01 SCREW (B2.6), (+) BV TAPPING
3
3-254-141-01 SCREW (B2.6), (+) BV TAPPING
4
3-262-675-01 KNOB (BRIGHTNESS)
1
1
2
2
2
2
3
3
4
cabinet (rear) block section
cabinet (upper) section
cabinet (lower) block section
Les composants identifiés par une
marque 0 sont critiquens pour la
sécurité.
Ne les remplacer que par une pièce
portant le numéro spécifié.
marque 0 sont critiquens pour la
sécurité.
Ne les remplacer que par une pièce
portant le numéro spécifié.
The components identified by mark
0 or dotted line with mark 0 are
critical for safety.
Replace only with part number
specified.
critical for safety.
Replace only with part number
specified.
•
Abbreviation
CND : Canadian model
IT
CND : Canadian model
IT
: Italian model
36
ICF-CD855/CD855L
7-2. CABINET (REAR) BLOCK SECTION
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
51
3-254-081-01 SCREW
52
3-840-486-12 CUSHION, SPEAKER
53
3-266-566-01 SHEET (REAR)
54
X-3384-706-1 CABINET (REAR) SUB ASSY
55
3-262-670-01 BUTTON (SIDE) (VOL + -. MODE)
51
51
51
51
55
53
54
52
cd lid section
not supplied
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