Read Sony ICF-CD855 / ICF-CD855L Service Manual online
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
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