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6-1.
BLOCK DIAGRAM – MD SERVO Section –
HR901
OVER WRITE HEAD
I
I
1
J
J
2
F
B
C
B
I
J
D
A
A
A
4
B
5
E
C
6
DETECTOR
D
7
C
D
E
E
8
F
F
9
LASER DIODE
AUTOMATIC
APC
ILCC
POWER
11
CONTROL
Q121, 122
PD
LD
LASER ON
PD
PD
SWITCH
10
Q101
OPTICAL PICK-UP BLOCK
(KMS-262A/J1N)
FOCUS/TRACKING COIL DRIVE,
SPINDLE/SLED MOTOR DRIVE
IC141
PSB
M101
6
OUT4F
IN4R
M
(SPINDLE)
8
OUT4R
IN4F
M102
27
OUT2F
IN2F
M
(SLED)
25
OUT2R
IN2R
2-AXIS
DEVICE
FCS+
21
OUT1F
IN1F
23
OUT1R
IN1R
FCS–
TRK+
12
OUT3F
IN3F
TRK–
10
OUT3R
IN3R
MOD
HF MODULE
05
SECTION 6
DIAGRAMS
OVER WRITE
HEAD DRIVE
IC181, Q181, 182
SCTX
RF AMP,
FOCUS/TRACKING ERROR AMP
IC101
48 47
RFO
AGCI
RF
RF AGC
RF AMP
46
40
38
& EQ
EQ
B.P.F.
AUX
33
WBL
3T
TEMP
PEAK
37
PEAK &
BOTM
BOTTOM
36
WBL
ADFM
ADIN
ADFG
AT
29
30
32
B.P.F.
AMP
I-V
ABCD
ABCD
AMP
35
AMP
FE
FOCUS
34
ERROR AMP
TE
26
I-V
TRACKING
SE
AMP
ERROR AMP
28
COMMAND
LD/PD
AMP
SERIAL/
PARALLEL
V-I
CONVERTER,
CONVERTER
DECODER
12
20
16
17
18
16
SPFD
3
SPRD
4
13
67
65
66
75
74
RECP
APCREF
AUTOMATIC
83
POWER
CONTROL
SFDR
ANALOG MUX
29
92
SRDR
30
91
A/D CONVERTER
DIGITAL
SERVO
SIGNAL
FROM CPU
PROCESS
FFDR
INTERFACE
19
88
FRDR
18
89
AUTO
SEQUENCER
TFDR
14
86
DIGITAL SERVO
TRDR
15
85
SIGNAL PROCESSOR
IC151 (2/2)
TX
15
EFMO
100
FILI
60
PCO
59
PLL
CLTV
62
FILO
61
ASYO
53
ASYI
54
COMPA-
RFI
RATOR
57
SUBCODE
ADIP
PROCESSOR
78
DEMODULATOR/
DECODER
CPU
F0CNT
SPINDLE
INTERFACE
79
SERVO
94 93
10
12
11
14
9 8
25
27 32 48 40
COMPARATOR
IC102
133
IOP
29
LDON
47
DIG-RST
35
WRPWR
14
MOD
12
13
63
64
5
6
IN1
IN2
LOADING
MOTOR DRIVE
IC400
OUT1 OUT2
2
10
M
M103
(LOADING)
XLRF
XLAT
80
CKRF
SCLK
81
DTRF
SWDT
82
HF MODULE
SWITCH
Q131 – 134
45
45
DIGITAL SIGNAL PROCESSOR,
EFM/ACIRC ENCODER/DECODER,
SHOCK PROOF MEMORY CONTROLLER,
ATRAC ENCODER/DECODER
ADDT
IC151 (1/2)
25
DATAI
SAMPLING
22
RATE
XBCKI
CONVERTER
BCK
24
LRCKI
LRCK
23
WAVE
SHAPER
DIN0
IC302
19
DIGITAL
DIN1
AUDIO
20
DOUT
INTERFACE
21
DADT
26
28
27
29
OSCI
16
CLOCK
OSCO
GENERATOR
17
INTERNAL BUS
MONITOR
CONTROL
5 6 7
1 2 3 4
XOE
43
XWE
47
XRAS
46
XCAS
44
38 42 50
58 56
SYSTEM CONTROLLER
LIMIT-IN
30
(MD MECHANISM CONTROLLER)
IC801 (1/2)
REC-SW
43
OUT-SW
51
+5V
REFERENCE
VZ
4
VOLTAGE SWITCH
Q400, 401
PLAY-SW 49
11
LD-LOW
REFLECT
67
SW
EEPROM
PROTECT
68
IC195
SW
SDA
5
61
SDA
SCL
6
66
SCL
WP
7
60
EEP-WP
MXD-D4
ADDT
A
(Page 46)
LRCK, BCK
C
(Page 46)
DIN0
F
(Page 46)
OPTICAL
DIGITAL
RECEIVER
OPTICAL
IC303
IN
DOUT
B
(Page 46)
• SIGNAL PATH
: MD PLAY (ANALOG OUT)
: MD REC (ANALOG IN)
: MD REC (DIGITAL IN)
: CD PLAY
X171
90.3168MHz
D-RAM
IC152
22
OE
4
WE
5
RAS
23
CAS
S101
(LIMIT IN)
S101
ON: When the optical pick-up is
inner position.
S105
(REC POSITION)
S105
ON: When the over write head is
recording position.
S103
(PACK OUT)
S103
ON: When the eject slider is
open position.
S104
(PLAY POSITION)
S104
ON: When the eject slider is
playback position.
S102
S102-1
–1
(REFLECT RATE DETECT)
ON: When the high reflection
rate disc detect.
–2
S102-2
(PROTECT DETECT)
ON: When the rec-proof claw is
close. (un-protect)
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- Disassembly
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