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HMC-MD777
6-2.
BLOCK DIAGRAM – MD SERVO Section (1/2) –
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
LD/PD
11
CONTROL
AMP
Q162, 163
PD
LD
LASER ON
PD
PD
SWITCH
10
Q101
OPTICAL PICK-UP
(KMS-260B/J1N)
FOCUS/TRACKING COIL DRIVE,
SPINDLE/SLED MOTOR DRIVE
IC152
PSB
16
M681
6
OUT4F
IN4R
3
M
(SPINDLE)
8
OUT4R
IN4F
4
M682
27
OUT2F
IN2F
29
M
(SLED)
25
OUT2R
IN2R
30
2-AXIS
DEVICE
FCS+
21
OUT1F
IN1F
19
23
OUT1R
IN1R
18
FCS–
TRK+
12
OUT3F
IN3F
14
TRK–
10
OUT3R
IN3R
15
MOD
HF MODULE
05
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
AUX
B.P.F.
33
WBL
3T
TEMP
PEAK
37
PEAK &
BOTM
BOTTOM
36
WBL
ADFM
ADIN
ADFG
AT
B.P.F.
29
30
32
AMP
I-V
ABCD
ABCD
AMP
35
AMP
FE
FOCUS
34
ERROR AMP
TE
26
I-V
TRACKING
SE
AMP
ERROR AMP
28
COMMAND
SERIAL/
PARALLEL
V-I
CONVERTER,
CONVERTER
DECODER
12
20
16
17
18
SPFD
SPRD
13
67
65
66
75
74
RECP
APCREF
AUTOMATIC
83
POWER
CONTROL
SFDR
ANALOG MUX
92
SRDR
91
A/D CONVERTER
DIGITAL
SERVO
SIGNAL
FROM CPU
PROCESS
FFDR
INTERFACE
88
FRDR
89
AUTO
SEQUENCER
TFDR
86
DIGITAL SERVO
TRDR
85
SIGNAL PROCESSOR
IC121 (2/2)
– 43 –
15
TX
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
75
27 73 78 36
57
LDON
77
DIGRST
67
WRPWR
65
MOD
63
64
XLRF
XLAT
80
CKRF
SCLK
81
DTRF
SWDT
82
HF MODULE
SWITCH
IC103, Q102 – 104
IC121 (1/2)
ADDT
25
DATAI
22
DIGITAL SIGNAL PROCESSOR,
SAMPLING
XBCKI
EFM/ACIRC ENCODER/DECODER,
RATE
24
SHOCK PROOF MEMORY CONTROLLER,
CONVERTER
LRCKI
ATRAC ENCODER/DECODER
23
IC121 (1/2)
CD DIGITAL/
OPTICAL IN
WAVE
DIN0
19
SHAPER
DIGITAL
DIN1
IC401 (1/5)
AUDIO
20
DOUT
INTERFACE
21
DADT
26
DADT, BCK,
LRCK, FS256
28
27
29
OSCI
16
CLOCK
OSCO
GENERATOR
17
22.5792MHz
INTERNAL BUS
MONITOR
CONTROL
5 6 7
1 2 3 4
XOE
43
XWE
47
XRAS
46
XCAS
44
35 37 66
82 81 80 79
SCTX 72
MD MECHANISM CONTROLLER
IC316 (1/3)
OPTSEL1 47
12
RESET SIGNAL
GENERATOR
MD BACK UP +3.3V
IC451
• SIGNAL PATH
– 44 –
ADDT
A
(Page 45)
B
(Page 42)
C
(Page 45)
X101
D-RAM
IC124
16
XOE
3
XWE
4
XRAS
17
XCAS
OPT SEL
D
(Page 42)
: MD PLAY
: MD REC (ANALOG IN)
: MD REC (CD DIGITAL)
: MD REC (OPTICAL IN)
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