CFD-S28L
– 21 –
– 22 –
– 23 –
– 24 –
6-3.
BLOCK DIAGRAM – MAIN Section –
REC/PB EQ AMP
IC301
SOUND CONTROL,
ELECTRICAL VOLUME
IC302
POWER AMP
IC303
05
A
(Page 18)
T901
POWER
TRANSFORMER
RECT OUT
AC HI
VDD
COM
BATT
•
SIGNAL PATH
: CD PLAY
: TUNER (FM/MW/LW)
: TAPE PLAY
: TAPE RECORD
R-CH: Same as L-CH.
SHIFT
CLOCK
Q505
Q505, 506
SHIFT CLOCK
Q506
X501
4.19MHz
RADIO
REC B+
AU VDD
CD 5V
COM 5V
VDD SW
RST
CD
SYSTEM
CONTROLLER
(IC501) B+
POWER AMP
(IC303, 304) B+
Q406
D909
D908
STBY
D351
R-CH
R-CH
R-CH
Q309
MEGA BASS
CONTROL
SWITCH
IN2
OUT2
S601 – 607, 609 – 614,
S617 – 624
S304
S303
M301
(CAPSTAN/REEL)
D302
Q322, 323
REC/PB
SWITCHING
(PB: ON)
Q303
ISS 1
SWITCH
Q302
ISS 2
SWITCH
B+ (REC B+)
B+
(REC B+)
B+
(REC B+)
B+ (REC B+)
B+ (CD 5V)
VREF
L.LO
L.CD
MIC IN
VREF
VREF
VREF
L.RAD
L.IN
L-CH
R-CH
XT
AL
EXT
AL
D
ATA
CLK
LA
T
KEY3
TAPE
RADIO
REC
29
32
31
30
70
71
8
19 20 18
VC
23
BC
21
R-LA
TCH
R-DA
TA
R-CLOCK
17
15 16
B-MUTE
R-COUNT
67
14
13
ISS1
76
ISS2
77
TAPE
69
V
-D
ATA
19
V
-CLOCK
20
V
-LA
TCH
18
A-MUTE
66
P-CON
21
REG CHK
80
15 17 21
6
20
31
24
12
3
5
L.RO
4
22
24
13
L-CH
CD
L-CH
R-CH
R-CH
R-CH
R-CH
MUTE
MUTE
KH303
(1/2)
1
2
CNP301
HRP301
(REC/PB)
HE301
(ERASE)
4
3
B
(Page 20)
MAIN BOARD (2/2)
SECONDARY BOARD
CONTROL BOARD
2
6
PB
EQ AMP
MONITOR
AMP
MATRIX
SOUND
CIRCUIT
TONE
CONTROL
CIRCUIT
LINE MUTE
SWITCH
Q308
RECT
D901 – 904
REGULATOR
IC901
AC DET
Q408
B+ SWITCH
Q952, 953
+6V
REGULATOR
Q954, 955
+5V
REGULATOR
IC502
+5V
REGULATOR
Q957
RADIO POWER
SWITCH
Q311, 312
CD POWER
SWITCH
Q313
RESET SIGNAL
GENERATOR
IC503
AC, BATTERY
CHECK
Q501, 502
B+ SWITCH
Q951
PROTECT
SWITCH
Q401
CONTROL
VOLUME
CONTROL
CIRCUIT
MIC
AMP
REC
EQ AMP
BIAS OSC
Q301
REC/PB
SWITCHING
Q324, 325
REC/PB
SWITCHING
Q326
REFERENCE VOLTAGE
GENERATOR
LOGIC CIRCUIT
DET
ALC
BUFFER
BUFFER
Q321
REC/PB
SWITCHING
(REC: ON)
T301
BIAS OSC
VREF
S305
(REC)
B+ (VDD SW)
6
1
3
2
KH506
4
5
CNP602
4
2
1
6
D601
OPR/BATT
10
5
+
KH306
5
4
CNP306
5
4
CNP902
4
1
UCOM
R-VT
PLL 5V
RADIO 6V
3
SW D
5
KH302
2
5
3
5
6
4
1
KH303
(2/2)
2
1
CNP305
3
2
4
CNP2 (2/2)
PLL LOW-PASS
FILTER CIRCUIT B+
FM/AM PLL (IC2) B+
FM/AM TUNER (IC1) B+
KH905
1
2
CNP904
1
2
KH902
2
1
3
CNP906
2
1
3
CNP307
SP301
(L-CH)
SP302
(R-CH)
4
3
J301
(HEADPHONE)
2
CNJ901
⁄
AC IN
1
2
HEADPHONE
BOARD
PRIMARY
BOARD
KH901
9V
4.5V
0V
3
1
2
4
CNP901
3
1
2
4
BATTERY
BOARD
BATTERY
COMMON BOARD
D906
D905
D907
D403 – 405
D402
D401
D406 – 408
D910
D952
D951
D303
D955
DRY BATTERY
SIZE “D”
(IEC DESIGNATION R20)
6PCS. 9V
(FOR POWER SUPPLY)
DRY BATTERY
SIZE “AA”
(IEC DESIGNATION R6)
4PCS. 6V
(FOR BACK UP)
AC DET
Q409
LEVEL DET
Q405
LEVEL DET
Q407
Q404
Q402
TUNER BOARD (2/2)
C
(Page 20)
X502
32.768kHz
TX
TEX
73
74
SEG0 – SEG22
LIQUID CRYSTAL DISPLAY
LCD501
42 – 64
COM0 – COM3
38 – 41
SYSTEM CONTROLLER
IC501 (2/2)
w
w
w
.
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u
1
6
3
.
c
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m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
