HCD-M70 - Sony Audio Service Manual (repair manual). Page 17

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HCD-M70
16
16
: TAPE PLAY
: REC
36 – 34
KEY1 – KEY3
50 – 53
COM0 – COM3
LIQUID CRYSTAL
DISPLAY
LCD801
54 – 85
SEG0 – SEG31
SIRCS
3
SDA
88
SCK
28
AU-CE
87
REMOTE CONTROL
RECEIVER
IC802
LED DRIVE
Q807
DSG
D811
LED DRIVE
Q809
CD SYNC
D813
CD-SYNC
26
27
38
99
RST
WP
22
AMP-MUTE
24
H/P CHK
97
AU-MUTE
RESET SIGNAL
GENERATOR
IC803
D801
D802
E
TU-L
(Page 15)
F
TC-L
(Page 15)
A
CD-L
(Page 14)
G
REC-L
(Page 15)
SYSTEM CONTROLLER
IC801 (3/3)
INPUT SELECT SWITCH,
ELECTRICAL VOLUME, 
TONE CONTROL
IC323
D814
(STANDBY)
LED DRIVE
Q808
TAPE
D812
TC-ON
96
STAND-BY LED
98
LED DRIVE
Q805
LED DRIVE
Q806
CD
D809
TUNER
D811
+5V
REGULATOR
Q306
LED DRIVE
Q810, 811
CD +5V
+9.5V
REGULATOR
Q305
+8V
REGULATOR
IC306
+9.5V
REGULATOR
Q301
7
REG-CON
(Page 15)
TU-ON
D
(Page 14)
CD-ON
C
RECT
D906 – 909
RELAY DRIVE
Q902
RECT
D902 – 905
+12V
REGULATOR
Q355
+5V
REGULATOR
Q901, 903
TUNER ON
SWITCH
Q303, 304
CD ON
SWITCH
Q307, 308
AMP +16V
AMP – 16V
D917
RECT
D910 – 913
WAKE UP
SWITCH
Q802, 803
POWER ON
MUTING
Q330
MUTING
CONTROL SWITCH
Q312, 313
DSG
D804, 805, 
D807, 808
(LCD BACK LIGHT)
TU +9.5V
COM +8V
CD +8V
COM +12V
25
TU-ON
15
CD-ON
SW +5V
U-COM +5V
T902
MAIN POWER
TRANSFORMER
T901
SUB POWER
TRANSFORMER
RY901
(Singapore)
(EXCEPT Singapore)
(AC IN)
VOLTAGE
SELECTOR
S901
BACKUP +5V
S801 – 820
3
COM +12V
D309
MUTING
Q408, 409
MUTING
Q100
4
10
14
+
+
SJ301
L
R
SPEAKER
IMPEDANCE
USE 6 – 16Ω
R-CH
R-CH
J301
HEADPHONE AMP
IC324
MOS GAIN &
LEVEL SHIFT
ING STAGE
MOS
OUTPUT
STAGE
SHORT
CIRCUIT
PROTECTION
IN+
IN+
MUT
STANDBY/MUTE
MUTE
STBY
POWER AMP
IC101
R-CH
OUT
R-CH
R-CH
DC DETECT
Q310, 311
PHONES
9
SPK PROTECT
R-CH
INPUT
SELECT
SWITCH
L4
L3
L1
L2
11
12
14
13
9
LIN
10
LSELO
5
LOUT
VOLUME
CONTROL
TONE
CONTROL
30
1
DI
CL
2
CE
CPU
INTERFACE
R-CH
SJ302
L
R
AUDIO IN
MD (VIDEO)
93
92
X800
32.768KHz
39
40
X801
4.19MHz
TEX
TX
EXTAL1
XTAL1
SIGNAL PATH
: TUNER (FM/AM)
: CD PLAY
: MD (VIDEO)
R-CH : R-ch is omitted due to same as L-ch.
POWER ON/OFF
RELAY DRIVE
Q902
TC +5V
+5V
REGULATOR
Q309
+8V
REGULATOR
IC304
9
R-CH
6-3.
BLOCK  DIAGRAM  – MAIN Section –
HCD-M70
17
17
Note:
The components identi-
fied by mark 
0
 or dotted
line with mark 
0
 are criti-
cal for safety.
Replace only with part
number specified.
Note:
Les composants identifiés par
une marque 
0
 sont critiques
pour la sécurité.
Ne les remplacer que par une
pièce por tant le numéro
spécifié.
6-4.
NOTE  FOR  PRINTED  WIRING  BOARDS  AND  SCHEMATIC  DIAGRAMS
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.)
• Indication of transistor.
Note on Schematic Diagram:
• All capacitors are in 
µ
F unless otherwise noted.  pF: 
µµ
F
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in 
 and 
1
/
4
 
W or less unless otherwise
specified.
f
: internal component.
C
: panel designation.
A
: B+ Line.
B
: B– Line.
H
: adjustment for repair.
• Voltages are taken with a VOM (Input impedance 10 M
).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F
: TUNER (FM/AM)
E
: TAPE PLAY
a
: REC
J
: CD PLAY (ANALOG)
c
: CD PLAY (DIGITAL OUT)
j
: MD (VIDEO)
• Abbreviation
AUS
: Australian model
CND : Canadian model
KR
: Korean model
MX
: Mexican model
SP
: Singapore model
TH
: Thai model
C
B
These are omitted.
E
Q
• Circuit Boards Location
JACK board
SWITCH board
POWER board
VIDEO board
MAIN board
TC board
CONTROL board
CD board
LOADING board
HCD-M70
18
18
IC102
IC103
IC101
(LIMIT)
28
15
1
14
E
12
13
1
24
40
60
61
80
21
20
41
TP (RF)
(SPINDLE)
M
(SLED)
M
TP
(VC)
1-680-693-
11
(11)
A
CONTROL BOARD
CN805
OPTICAL
PICK-UP
BLOCK
(KSM-213DCP)
CD BOARD
A
B
C
D
1
2
3
4
6-5.
PRINTED  WIRING  BOARD  – CD Board –
 See page 17 for Circuit Boards Location.
IC101
C-3
IC102
B-3
IC103
C-2
Q101
B-2
• Semiconductor
Location
Ref. No.
Location
(Page 26)
HCD-M70
19
19
The components identified by mark 
0
 or dotted
line with mark 
0
 are critical for safety.
Replace only with part number specified.
Les composants identifiés par une marque 
0
 sont
critiques pour la sécurité.
Ne les remplacer que
par une pièce portant le numéro spécifié.
6-6.
SCHEMATIC  DIAGRAM  – CD Board –
 See page 25 for Waveforms.
 See page 32 for IC Block Diagrams.
• Voltages and waveforms are dc with respect to ground
under no-signal conditions.
no mark : CD PLAY
: Impossible to measure
(Page 27)

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