Sony ICF-CD855 / ICF-CD855L Service Manual ▷ View online
ICF-CD855/CD855L
17
17
6-2.
BLOCK DIAGRAM – TUNER Section –
2
24
4
7
20
21
FM
RF AMP
FM
MIX
FM
OSC
FM IF
AMP
IF
BUFFER
AF
BUFFER
AF
AMP
MPX
MUTE
STEREO/
MONO,
FM/AM
FM/AM
AM IF
AMP
FM
DET
AM
DET
DET
6
FM
RF-IN
RF-IN
22
AM
RF AMP
Q14
AM
MIX
AM
RF-IN
RF-IN
MIX-OUT
OSC
-OUT
CF2
FM/AM PLL
IC2
(US, CND, MX, SP, AUS) (AEP, UK, IT, EE)
CF4
FM
RF-OUT
RF-OUT
10
QUAD
FM
IF-IN
IF-IN
12
15
11
L-OUT
MPX
-IN
-IN
R-OUT
13
AM
IF-IN
IF-IN
LPF1/BAND
AM OSC
FM OSC
FM/AM RF AMP, MIX, OSC,
FM/AM IF AMP, DET, MPX
IC1
(CD855) (CD855L)
L2
FM VCO VOLTAGE
CT1, L1
FM TRACKING
CT3, L3
AM TRACKING
T1
AM IFT
LOW-PASS
FILTER
LOW-PASS
FILTER
• SIGNAL PATH
: FM
: AM (MW/LW)
X1
75kHz
CT3
L1
FM RF
XOUT
XIN
AM IN
IF IN
ST
-IND
LP-OUT
LP-IN
FM IN
20
19
11
12
18
MW/L
W
6
CT1
D1
L4
AM (MW/LW)
OSC
L2
FM OSC
LEVEL
DET
ST
IND
14
LPF2/MO-ST
AM
OSC
BUFFER
BUFFER
SWALLOW
COUNTER
UNIVERSAL
COUNTER
CCB
INTERFACE
REFERENCE
DIVIDER
UNLOCK
DETECT
12 BIT
PROGRAMMABLE
DIVIDER
PHASE
DETECTOR/
CHARGE PUMP
SHIFT REGISTER & LATCH
1/2
BAND
DI
CL
CE
DO
DET
-OUT
ANT1
FM LEAD WIRE
ANTENNA
PD
IF-OUT
ST
-IND
2
3
1
4
10
9
BAND
7
MO/ST
13
8
17
16
17
18
16
19
CT5
D2
VT B+
(CD855L)
(CD855)
D3
(1/2)
D3
(2/2)
AM HIGH
CUT
SWITCH
Q12
T1
AM IF
Q42
Q41
RADIO
+6.2V
Q41, 42
MW SWITCH
L3-1
MW
L3-2
LW
L3
MW/LW
FERRITE-ROD
ANTENNA
MW
TRACKING
CT3, L3-1
LW
TRACKING
CT5, L3-2
LW
SWITCH
Q44
LW SWITCH
Q43
• R-ch is omitted due to same as L-ch.
R DATA
R CLOCK
R CE
R-CH
(Page 18)
C
R MUTING
TU-LOUT
(Page 18)
B
CONSTANT
CURRENT
Q61
T2
FM IFT
T2
FM IF
L3
AM FERRITE-ROD
ANTENNA
(CD855L)
(CD855L)
(CD855)
R DATA, R CLOCK, R CE,
R MUTING
(CD855L)
(CD855)
(CD855L)
(CD855)
L4
AM VCO VOLTAGE
L4
LW VCO VOLTAGE
ICF-CD855/CD855L
18
18
6-3.
BLOCK DIAGRAM – MAIN Section –
76
RESET
79
CD ON
SYSTEM CONTROLLER
IC401 (2/2)
+3.3V
REGULATOR
Q908
49
AC IN
60
POWER ON
52
BUZZER
POWER AMP
B+
POWER AMP
B+
CD
+3.3V
U-COM
+3.3V
MOTOR
+6.2V
(AC IN)
KEY-2
R-CH
POWER AMP
IC302
SP101
(L-CH)
(L-CH)
SP201
(R-CH)
J301
i
S618
R DATA
R CLK
R CLK
R CE
59
57
48
MUTE
51
SEG0 – SEG27
LIQUID CRYSTAL DISPLAY
LCD601
10 – 37
64 – 66
ALARM B BUZ,
ALARM B RADIO,
ALARM B CD
COM0 – COM3
6 – 9
44
KEY-1
S613 – 617
45
KEY-3
S607 – 612
43
KEY-0
S403, 601 – 606
46
R DATA
R DATA, R CLOCK, R CE,
R MUTING
R MUTING
R CLOCK
R CE
R MUTING
R MUTING
VOL CLK
64
VOL DA
T
65
AMUTE
77
B
TU
L-OUT
L-OUT
(Page 17)
C
(Page 17)
A
CD
L-OUT
L-OUT
(Page 16)
INPUT SELECT,
ELECTRICAL VOLUME,
SURROUND/TONE CONTROL
IC301
CD LIN
R LIN
VIN1
SEL1
LOUT
14
SI
13
SC
18
BOUT L
19
BNF L
1
4
17
VOLUME
CONTROL
SURROUND
CONTROL
TONE
CONTROL
INPUT
SELECT
5
7
LOGIC
AGC
Q101
D102
D103
D908
MUTING
Q102
MUTING
CONTROL
Q302
6
POWER
AMP
2
1
STBY
R-CH
CD
+5.6V
+5.6V
REGULATOR
Q903
REGULATOR
CONTROL
Q909
LED DRIVE
Q604 – 606
D604 – 606
(ALARM B INDICATOR)
61 – 63
ALARM A BUZ,
ALARM A RADIO,
ALARM A CD
LED DRIVE
Q601 – 603
D601 – 603
(ALARM A INDICATOR)
70
71
X401
32.768kHz
74
75
X402
4.19MHz
XT1
XT2
X1
X2
RESET SIGNAL
GENERATOR
IC402
: CD PLAY
: TUNER (FM/AM)
SIGNAL PATH
R-CH : R-ch is omitted due to same as L-ch.
RADIO
+6.2V
RADIO
B+ SWITCH
Q301
78
RADIO ON
+6.2V
REGULATOR
Q904 – 906
POWER
UNIT
+4V
REGULATOR
Q907
AC CHECK
Q401, 402
Q401, 402
ICF-CD855/CD855L
19
19
6-4.
NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
Note on Schematic Diagram:
• All capacitors are in
• All capacitors are in
µ
F unless otherwise noted. pF:
µµ
F
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.
•
f
: internal component.
•
C
: panel designation.
•
A
: B+ Line.
•
H
: adjustment for repair.
• Voltages and waveforms are dc with respect to ground
under no-signal conditions.
– CD Board –
[
– CD Board –
[
] : CD PLAY
– TUNER Board –
no mark : FM
(
no mark : FM
(
) : AM (MW)
[
] : LW
– Other Boards –
no mark : FM
(
no mark : FM
(
) : CD PLAY
• 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 (MW/LW)
J
: CD PLAY
• Abbreviation
CND : Canadian model
IT
IT
: Italian model
Note on Printed Wiring Boards:
•
•
X
: parts extracted from the component side.
•
Y
: parts extracted from the conductor side.
•
W
: indicates side identified with part number.
•
f
: internal component.
•
: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
Caution:
Pattern face side:
Pattern face side:
Parts on the pattern face side seen from
(Conductor Side)
the pattern face are indicated.
Parts face side:
Parts on the parts face side seen from
(Component Side)
the parts face are indicated.
• Circuit Boards Location
SWITCH board
LCD board
SIDE board
MAIN board
RELAY board
KEY-B board
TUNER board
SNOOZE board
CD board
KEY-A board
Note:
The components identi-
fied by mark
The components identi-
fied by mark
0
or dotted
line with mark
0
are criti-
cal for safety.
Replace only with part
number specified.
Replace only with part
number specified.
Note:
Les composants identifiés par
une marque
Les composants identifiés par
une marque
0
sont critiques
pour la sécurité.
Ne les remplacer que par une
pièce por tant le numéro
spécifié.
Ne les remplacer que par une
pièce por tant le numéro
spécifié.
ICF-CD855/CD855L
20
20
C733
C706
X701
C740
C735
C702
CNP702
C746
JW703
JW704
JW705
JW706
JW708
JW709
JW710
JW716
JW717
JW718
JW723
JW724
JW725
JW726
JW727
JW728
JW729
JW731
JW732
JW733
JW734
JW722
JW719
JW720
JW713
JW712
JW711
JW730
JW715
JW721
CNP701
JW707
JW702
C709
C724
R741
C703
R718
C722
C708
C717
C720
R723
C727
C716
C745
R729
R727
C721
R744
C725
R746
C731
R732
R725
C729
C711
R730
C701
Q701
R720
C730
C726
R707
R716
R726
R717
R728
R722
R714
R742
C728
R708
C707
C744
R724
L706
R719
C704
R721
FB701
C755
C723
C754
IC702
R733
R710
R731
C751
C741
R702
C736
C743
R704
R712
R709
C705
R740
R715
R711
C734
R706
R703
C742
R713
R750
R748
JC703
JC704
JC706
JC707
JC708
JC709
JC710
JC711
JC705
IC701
R739
R751
R747
1
80
40
41
20
21
61
60
1
19
2
20
M701
(SLED)
M
S701
(LIMIT)
ON : WHEN THE OPTICAL PICK-UP
IS INNER POSITION
IS INNER POSITION
M702
(SPINDLE)
M
OPTICAL PICK-UP
BLOCK
(KSM-900A)
TP
(VREF)
TP
(TE)
TP
(RF)
14
13
2
1
A
MAIN
BOARD
CNP303
RELAY BOARD
CD BOARD
(11)
11
1-861-271-
1
2
19
1
6
20
CNP704
CNP706
1
CNP705
2
15
16
JW701
JW702
(11)
11
1-687-668-
6-5.
PRINTED WIRING BOARDS – CD Section –
•
See page 19 for Circuit Boards Location.
:Uses unleaded solder.
(Page 27)
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