Service manual
MD-MT831H/W
– 27 –
Figure 27 BLOCK DIAGRAM
HEAD DRIVER
IC351:74ACT02T
IC353:FTD2005
IC354:CPH5608
VCC VEE
BATTERY
RECHARGEABLE
BATTERY
IC841
RESET 2.35V
REGULATOR
XC66DS01
IC830
DC/DC CONVERTER
IR3M12N
IC501
AD/DA
CONVERTER
AK4519VF
M902
SLED
MOTOR
IC101
RF SIGNAL
PROCESSOR
IR3R58M
IC771
2.5V REGULATOR
62GR2522
IC200
POWER DRIVE
62FP2502
IC401
SYSTEM
MICROCOMPUTER
IX2823AF
RIPPLE
FILTER
VCC VEE
IC871
4.5V REGULATOR
62GR4522
OPIC
LASER
PICK
HEAD
M901
SPINDLE
MOTOR
IC201
ENCORD/DECORD/
SERVO ATRAC
LR37812
+2.7V
+2.5V
T F
+2.5V
+2.7V
+2.5V
+2.7V
VDD
+1.7V
+2.7V
+2.2V
–2.3V
AVCC
+2.5V
+6~8V
+2.7V
J703
HEADPHONES
J703
REMOTE
CONTROL
J801
DC IN
(4~5.5V)
(2.9~4.1V)
(3.3V)
VCC
+2.35V
LCD
OPERATION SWITCH UNIT
IC703
AUDIO AMP.
IR3R59N
IC701
AUDIO AMP.
IR3R54N
IC601
DRIVE SERVO/MOTOR
CONTROL
BD6603KV
IC402
58X2404T
EEPROM
+4.5V
IC202
IX2824AF
16 BIT D-RAM
+2.5
+4.5V
INPUT/OUTPUT
UNIT
OPTICAL IN
J701
LINE IN
J702
MIC IN
IC203
1.7V REGULATOR
62FP1702
57,58
21,25,
27,29
7,9,
12,14
40,42
8,13
41,63
29,40
37
3
26-30,
32-37,
39-46
2-5,
7-11,
14-23
66
74
15
6
19
4
20 17
9,16
7,18
10
6
24
17
Q721
8
23
1-2
46
2-5,17
35-38,54
2,5-7
14-17
83,
84
82
74
2,5,31
17-25
57,58
50
5
2,3
5
18
3
4
5
+9V
8
1,12
+2.7V
82-84,86,
89-100
62
3
2
1,2,23,24
2
18,23
8
(UP/DOWN)
(DOWN)
19,20
SW402
HOLD
SW902
DISC
PROTECT
55
4
SW401
EJECT
SW403
LID
DETECTION
97
73 12
PLAYBACK SIGNAL
RECORD SIGNAL
+B
+B
+B
+B
+B
+B
M903
LIFT
MOTOR
45,47
20
21
R-CH
L-CH
R-CH
L-CH
8
3
4
5
R-CH
L-CH
3
2
22
R-CH
L-CH
3
2
1,20,21,23-30,
73,93-95
Q101
IC851 POWER DRIVE
NDS331N
+2.7
2
3
LASER ON/OFF
IC1
FLIP FLOP IC
7WH74FK
31,87,98
+2.35V
22
75
1,6-8
2
M
M
M
J701
IC801,IC802
OVER
VOLTAGE
REVERSE
CONNECTION
PROTECTION
CIRCUIT
Q101
SWITCHING
49
3
8
Q601
Q602
SWITCHING
Q891
8
7
28
IC821
P CHANNEL
DUAL FET
FDG312P
3
4
17