Sony Walkman MZ-R900 Service Manual - Page 27

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Sony Walkman MZ-R900 Service Manual
6-1.
BLOCK DIAGRAM – SERVO Section –
HR601
OVER
OPTICAL PICK-UP BLOCK
WRITE
(LCX-4R)
HEAD
IY
–
+
IX
–
+
JX
–
JX JY JX
+
JY
–
+
IX IY
IX
A
–
+
B
A B C D
–
+
C
–
+
D
–
+
MON
–
+
AUTOMATIC
LD-A
POWER
LD
CONTROL
Q501
S0
S1
2-AXIS
DEVICE
TRK+
TRK+
(TRACKING)
(FOCUS)
TRK–
TRK–
FCS+
FCS+
FCS–
FCS–
SECTION 6

DIAGRAMS

OVER WRITE
HEAD DRIVE
Q604, 605
OVER WRITE
RF AMP, FOCUS/TRACKING ERROR AMP
IC501
UP/DOWN
4
VREF
IY
RF OUT
8
33
IX
9
PEAK
JX
29
10
PEAK
RF AMP,
BOTM
JY
/BOTM
28
11
FOCUS
A
12
ERROR,
ABCD
B
41
TRACKING
14
FE
C
ERROR
42
5
D
TE
6
1
A-C
ADIP IN
44
13
TPP/WPP
D-C
ADIP
21
7
PD-NI
PD-I
18
APC
19
VC
31
26
OFTRK
PD-O
RESET
20
25
SERIAL
INTERFACE
SBUS
23
SCK
24
S-MON
S-MONITER
43
M602
M M
(SLED)
U
M601
W
V
(SPINDLE)
OVER WRITE HEAD DRIVE
IC601 (1/2)
HB
35
EFM
PRE DRIVER
HA
33
OUTA
41
M603
H-BRIDGE
OUTB
PRE DRIVER
38
M M
HEAD
SYSTEM CONTROL (1/2)
25
VREF
1 2 3
5 6
199 198 197
201 200
37
RFI
44
PEAK
45
BOTM
46
ABCD
47
FE
56
TE
74
ADIP
78
APCREF
49
VC
12
VREF MON
217
OFTRK
221
XRF RST
FOCUS/TRACKING
COIL DRIVE,
SPINDLE/SLED
MOTOR DRIVE
IC551
160
SSB DATA
TRK+
FO3
161
SSB CLK
33
TRACKING
TRK–
RO3
COIL DRIVE
9
S MON
35
FCS+
FO1
10
FOCUS
194
PD S0
FCS–
RO1
COIL DRIVE
8
195
PD S1
FO2
14
CPAIP
42
RO2
12
CPAIM
MOTOR
41
FO4
29
CPBIP
40
RO4
31
CPBIM
39
CPA0
38
SLED VOLTAGE
CPB0
MONITER
37
UO
48
CPUI
53
VO
46
CPVI
52
WO
44
CPWI
51
COM
54
SPINDLE
VOLTAGE MONITOR
55
56
1
27
27
EFM
7
CLK
4
VRECIN2
VRECO
37
VRECIN1
B+
42
C1H
28
CHARGE
C1L
PUMP 1
27
C2H
31
CHARGE
C2L
PUMP 2
38
105
SYSTEM CONTROLLER,
DIGITAL SIGNAL PROCESSOR,
16M BIT D-RAM
IC801 (1/3)
FI3
25
81
TFDR
RI3
24
80
TRDR
FI1
19
82
FFDR
RI1
18
83
FRDR
233
SLD MON
FI2
17
96
SLDR
RI2
SLED
16
98
SLDV
PWMI4
20
97
SFDR
FI4
DRIVE
26
99
SLDW
RI4
27
102
SLCW
SPINDLE
166
SPDL AUX PWM
SERVO
PWM
5
DRIVE
SWITCH
88
SPFD/SPVS/PWM3
IC805
223
SPDL MON
UI
4
87
SPDU
SPINDLE
VI
MOTOR
3
89
SPDV
DRIVE
WI
2
90
SPDW
SPCW
OF
BIAS
6
220
XRST MTR DRV
MZ-R900
SIGNAL PATH
: PLAYBACK
: REC (ANALOG IN)
: REC (DIGITAL IN)
DIN1
A
(Page28)
DIN1
62
ADDT
B
(Page 28)
ADDT
68
DADT
DADT
67
C
(Page 28)
CLK
D
(Page 29)
SLD1 MON
SLCU
100
SLD2 MON
SLCV
101
CLV MON U
SPCU
93
CLV MON V
SPCV
94
CLV MON W
95
VREF
E
(Page 29)