24
24
HCD-EC70
HCD-EC70
6-3. BLOCK DIAGRAM — MAIN SECTION —
: TUNER(FM)
: TUNER(AM)
: CD
• Signal Path
: AUX
: PB (TAPE)
: REC (TAPE)
• R-CH is omitted due to same as L-CH.
BIAS
OSC
Q507
REC/PB
HEAD
BLOCK
TAPE MECHANISM DECK
V2/P82
V1/P81
V0/P80
SYSTEM CONTROLLER
IC701(2/2)
P57/SI1
VOLUME
VOLUME
AUDIO IN
J105
FUCTION
KEY
REMOTE
CONTROL
RECEIVER
IC703
SW702-704, SW706,709,710,719,721
SW711-716, SW708,720
SW701,705
L-CH
R-CH
R-CH
TU-DO
TU-DI
TU-CLK
TU-ANSD
TU-CE
R-CH
P63/AN3
39
55
56
57
33
L501
SW501(1/2)
(REC/PB)
(REC/PB)
SW501(2/2)
BIAS OSC
P64/AN4
40
X1A
14
X0A
13
X701
32.768kHz
X0
93
X1
92
X702
4.19MHz
9
P34/IC0
FUCTION
KEY
FUCTION
KEY
38
41
3
1
RESET
SWITCH
Q704
54
RSTX
RESET
Q705,706
42
D051,052
RELAY
DRIVE
AC
IN
Q102
RY001
37
P61/AN1
P62/AN2
P65/AN5/INT0
P71/AN9/SC1
P66/AN6/INT1
+9V
PB/REC EQ AMP
IC401
R-CH
A1
19
18
OUT 1
16
OUT 2
B1
21
PB1P
2
C1
23
13
SD
28
REC 10
R-CH
R-CH
L-CH
P27
48
POWER
AMP
(HIGH)
SEG0
SEG31
59
62
COM0
COM3
LIQUID CRYSTAL
DISPLAY
LCD702
Q135
Q301
Q367
Q366
Q131,137
µ
CON +B
+3.6V
36
P60/ANO
P73/AN11/SI2
LINE
FILTER
L001
+9V
VM9V
4,5
11
IC301
2
P25
D702
+9V
REG
IC101
+VP
-VP
1
3
D101
Q151-154
D111,113
+3.3V
REG
Q191
Q192
AVDD
( +3.3V)
DVDD
( +3.3V)
+3.3V
REG
D156
D154
+9V
POWER
MONITOR
Q121,122
+3.6V
REG
Q701-703
1
P24
+3.6V
67
63
64
89
94
100
.
.
.
17
P40/LED0
46
SW700
LED702
LED
DRIVE
Q707
LED701
(BACK RIGHT)
STANDBY
J102
PHONES
R-CH
R-CH
L
R
R-CH
J101
L
R
R-CH
CD-R
CD-L
A
BD/DRIVER
SECTION
(Page 22)
P-SW
M-SW
+7V
PT001
POWER
(MAIN)
TRANSFORMER
PT002
POWER
(SUB)
TRANSFORMER
4
HP
AMP
RELAY
CONTROL
OVERLOAD
AMP
PROTECT
THERMAL
DET
PROTECT
DET
Q203,207
Q201
OVERLOAD
DET
THERMAL
DETECTION
DET
M
+9V
FAN
CONTROL
Q901,902
CURRENT
DET
Q921
M901
FAN MOTOR
M
HP MUTE
HIGH MUTE
CONTROL
Q133,134,141
FILTER
Q303
AMP
CONTROL
Q361
LOW MUTE
CONTROL
Q251
MUTE
Q305,306
13
POWER
AMP
(LOW)
3
IC201
2
12,13
SPEAKER
HIGH FREQ.
IMPEDANCE:
USE 8
J201
SPEAKER
LOW FREQ.
IMPEDANCE:
USE 8
TUNER
SECTION
(Page 23)
B
RY131
RY201
TH361
