Read Sony CMT-EH12 / HCD-EH12 Service Manual online
HCD-EH12
16
16
HCD-EH12
7-3. BLOCK DIAGRAM – MAIN Section –
R-CH
+
INPUT SELECT,
ELECTRICAL VOLUME
IC401
28
REC1O
18
OUT1
13
SD
23 C1
21 B1
2 PB1P
19 A1
R-CH
CD
A
TUNER
• SIGNAL PATH
: CD PLAY
: TAPE PLAY
: REC
• R-ch is omitted due to same as L-ch.
: TUNER
J105
AUDIO IN
: AUX IN
J102
PHONES
SPEAKER
+
–
–
–
+
R
L
J101
BIAS OSC
L501
OSC
Q507
HR501
(REC/PB)
TAPE
MECHANISM
DECK
L-CH
SW501-1
SW501
(REC/PB)
PB
r
REC
R-CH
R-CH
POWER
AMP
IC301
4
P27
IC0
9
SYSTEM CONTROLLER
IC701 (3/3)
+
(AC IN)
F001
POWER
TRANSFORMER
PT005
SYS +3.3V
D702
D191, 192
D372
AMP B+
+4V
REGULATOR
Q701 – 703
RECT
D107 – 110
B+ SWITCH
Q351, 352
AC DETECT
Q371, 372
AC DETECT
Q121, 122
VOLTAGE
DETECT
Q705, 706
+1.8V
REGULATOR
IC202
CD +1.8V
RECT
D111, 113
VSTBY
+9V
REGULATOR
Q101 – 103
VM +9V
+3.3V
REGULATOR
Q192
+3.3V
REGULATOR
Q191
CD D +3.3V
CD A +3.3V
VM +7V
+5V
REGULATOR
Q802
TUNER +5V
+3.1V
REGULATOR
Q801
TUNER +3.1V
AC DETECT
Q193
1
P24
42
AN6
36
AN0
54
RSTX
REMOTE CONTROL
RECEIVER
IC703
LED DRIVE
Q707
LED701
(LCD BACK LIGHT)
LED0
17
SC1
46
LED702
X701
32.768kHz
14
13
X1A
X0A
92
93
X702
4.19MHz
X1
X0
LCD702
LIQUID
CRYSTAL
DISPLAY
48 SI2
28 PPG1
ROTARY
ENCODER
SW700
VOLUME
STANDBY
SW701 – 705,
SW711 – 716
(FRONT PANEL KEYS)
SW750
(CD LID OPEN/CLOSE DETECT)
AN1, AN2, AN5
37, 38, 41
COM0 – COM1
59 – 62
SEG0 – SEG31
63, 64, 67 – 89, 94 – 100
RESET
SWITCH
Q704
C
AMP-STBY
B
SW501-2
40
AN4
DC
DETECT
Q123
(Page 14)
(Page 15)
(Page 14)
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