Sony GV-A500E, Service Manual

Page: 27 / 127

GV-A500/A500E
3-4. SERVO BLOCK DIAGRAM
3-10 3-11 3-12
IC121
12@ª
REC/PB
1Vp-p
6.7msec (PAL)
5.6msec (NTSC)
IC117
$£
REC/PB
IC117
$¢
REC/PB
IC117
%§
REC/PB
IC117
%¶
REC/PB
IC117
%•
REC/PB
IC117
^¶
IC117
^ª
REC/PB
IC120
3
REC/PB
IC120
!£
REC
IC120
#¡
3Vp-p
26
µ
sec
3Vp-p
3Vp-p
3Vp-p
40msec (PAL)
34msec (NTSC)
3.33msec (PAL)
2.78msec (NTSC)
3Vp-p
5.86MHz (PAL)
5.94MHz (NTSC)
0.4Vp-p
(NTSC)
V
0.35Vp-p
(NTSC/PAL)
5
µ
sec
26
µ
sec
3Vp-p
0.87msec (PAL)
1.2msec (NTSC)
1.7Vp-p
11.72MHz (PAL)
11.89MHz (NTSC)
0.3Vp-p
V
IC120
2
REC/PB
0.4Vp-p
(NTSC)
V
IC121
!¡
REC/PB
IC121
!•
REC/PB
IC501
4
REC/PB
IC501
^¢
REC/PB
0.7Vp-p
506kHz
0.7Vp-p
506kHz
B-MECHA
VCC
CFG(+)
CFG( )
CAP FG
WAVE
SHAPER
IC001
(1/2)
3
12
11
3
2
1
FG
CAPSTAN FG
DRUM
RUM FG
FG/PG COM
DRUM PG
PG
3
12
11
3
2
1
CN104
D3.2V
CAP FG
OFFSET ADJ
(1/2)
IC121
(1/2)
CN103
WAVE
SHAPER
18 15
14
13
VREF
LPF
WAVE
SHAPER
15
11
DRUM FG/PG
WAVE SHAPER
VC-197 BOARD
57
56
44 DRUM PWM
DRUM FG
DRUM PG
IC117
(2/2)
SERVO CONTROL
LPF 8
10
12
9
7
6
0.22V
IC122
(4/4)
LPF
ERROR
AMP
9
10
Q1851
11
FRB
9
10
CN106
DRUM ERROR
CAP ERROR
SHORT CIRCUIT
PROTECT
LPF
21
22
10
12
11
16
17
14
SHORT CIRCUIT
PROTECT
9
VS
VCC1
7
SWITCHING
DRIVE
SWITCHING
DRIVE
PWM
PWM
64
4
29
30
63
5,6
OUTPUT
VTR UNREG
RT
CT
CN502
L505
L504
SWITCHING
Q501
SWITCHING
Q502
VTR UNREG
IC501
(2/2)
DRUM/CAPSTAN
PWM DRIVE
3
CN502
42
27
.
4
1
.
2
3
42
27
.
4
1
.
2
LCD DD ON
VTR DD ON
DRUM VS
CAP VS
CN106
OUTPUT
DRIVE
BUFFER
LCD DD ON 58 IC1952
OUTPUT
DRIVE
CONTROL
LOGIC
3
STBY
30
29
2
1
25
27
6
26
28
8
STBY
VTR UNREG D3.2V
VCC2
COM
U IN
V IN
W IN
W
V
U
ICOM
R1851-1853
DRUM DRIVE
CURRENT SENS
IC121
(2/2)
DRUM
MOTOR DRIVE
VTR DD ON 29 IC1952
FROM
MODE
CONTROL
BLOCK
9
4
.
10
9
4
.
10
DRUM COM
DRUM U
7
.
8
7
.
8
DRUM V
5
.
6
5
.
6 DRUM W
CN104
B-MECHA
(2/2)
6
.
5
CN103
4
10
9
6
.
5
4
10
9
120
°
LOGIC
POWER
OFF
HE
POWER
M901
DRUM MOTOR
VTR UNREG
M902
H
H
H
H1 (+)
CAP U
CAP V
CAP W
VS
VCC
STBY
FRC
U IN1
U IN2
H1 ( )
VH +
VH
H1 (+)
H1 ( )
H1 (+)
H1 ( )
H1 (+)
H2 (+)
H2 ( )
H3 (+)
H3 ( )
H1 ( )
V IN1
V IN2
W IN1
W IN2
U
V
W
CAPSTAN
MOTOR
CAP VS
CAP ON
CAP FWD
43 CAP PWM LPF
68
67
X1752
11.89MHz
OSC1
OSC0
66 REF PILOT ATT
71 ATF ERR AD
1
DRUM ON
89 CAP ON
90 CAP FWD
69 ATF 5.9M
26 CS ATF
97 ATF STBY
FROM
VIDEO 1
BLOCK
CFG DUTY
21 EVR
58 CAP FG
30 CFG HMS
4
CAP FG
CN207
(FOR CHECK)
86 VDD VPP
76 AV REF
77 A VDD
42 VDD
87 VDD
EVER 3.15V
21 CS
MODULATOR
14 STBY
20 S IN
19 SCLK
11
FROM
VIDEO 2
BLOCK
TO/FROM
SYSTEM
CONTROL
BLOCK
31
13 LPF
VC SO
34 IC117
VC SCK
4 IC119
RP PB MODE 5 IC117
PBRF 17 IC101
REC ATF 63 IC101
REF PILOT
VREF
46kHz
BPF
LPF
AMP
17 5
CLK 5.9M
30
AVDD
18
DVDD
LPF
16kHz
BPF
9
2
3
LPF 7
6
8
D3.2V
L1753
10
IC120
ATF SERVO
(2/2)
16
4dB
AMP
SP IN
29
IC120(1/2)
PAL ONLY
(NTSC)
11.72MHz
(PAL)
Q1752,1753
DD-100 BOARD
(SEE PAGE 4-44)
(SEE PAGE 3-4)
(SEE PAGE 3-13)
(SEE PAGE 3-9)
(SEE PAGE 4-75)
(SEE PAGE 3-18)