Read Sony FDL-250T Service Manual online
– 10 –
– 9 –
– 8 –
4-1.
BLOCK DIAGRAM
IF
TU101
TUNER
RV001
UP
RV002
VP
RV004
VA
F601
7
9
8
T601
J701
DC IN 4.5V
RF IN
AGC
HB
LB
TU
IF AMP
Q201
IF AMP
AGC
BS
COMPOSITION
28
INPUT
CONTROL
AUTO
RETURN
CHARGE/
DISCHARGE
BT
GENERATOR
INITIAL
SET
DEFECT
OUT PUT
SIGNAL
DEFECT
COMPARATOR
3
PULSE WIDTH
SET
14
6
5
MUTE
Q203
10
MUTE
Q003,004
S001
CH -
S002
CH +
CH +
R OUT
IC302
Y/C/J
14
3
6
7
BUFFER
20
19
16
15
17
13
FM
DET
10
VIDEO
DET
LIMITER
VIDEO
AMP
18
AFT
4
21
22
23
SYNC
SEP
18
19
23
20
INITIAL
SET
30
31
BAR
OUT PUT
16
DC AMP
Q002
26
27
VOLTAGE
SELECT
Q001
BAND
SW
UB
MB
VH/VL SW
Q011
VH/VL SW
Q012
U/V SW
Q010
CF203
CF201
T201
CF202
19
BUFFER
Q304
RV301
CONT
G OUT
21
B OUT
24
CONTRAST
2
TINT
13
COMMON AMP
37
VCO OUT
16
VCO IN
14
PFRP
SYNC SEP
VIDEO IN
SW
R IN
COMMON OUT
38
RV308
TINT
RV302
COMP AMP
3
2
7
IC301
AMP
BRIGHT
G IN
SYNC IN
SYNC OUT
34
44
X301
3.58MHz
CK2A
18
FRP
33
COMMON FRP
STHR
14
CKV
16
CK1A
17
STHL
13
32
OEH
3
OEV
4
STV1
10
STV2
11
CK3A
19
Q1HA
8
INV/O
1
INV/I
2
LRA
40
UDC
37
17
VCC
16
VGH
15
VCOM
14
AVDD
13
STHR
12
L/R
10
VR
9
VG
8
VB
6
CPH3
5
CPH2
4
CPH1
3
Q1H
2
OEH
1
STHL
22
STVR
20
CKV
19
OEV
18
STVL
24
VGL
21
U/D
18
UNREG
17
UNREG
14
HP
12
30V
10
7.5V
9
5V
6
UHF
4
IND
2
-10V
1
BRT
7
VIDEO
5
VHF
INVERTER
Q302
HSY/O
VSY/I
SYNC SEP
Q401,402
Csync
NPD
OSC/O
OSC/I
+
1
-
3
4
O
IC403
LCD CONTROL
IC401
OSC
CN401
SW
Q306
SW
Q305
L401
T202
45.75MHz
10
AUDIO
4
AUDIO
2
BRT
1
5V
7
AUDIO
5
AUDIO
4
2
1
7
5
10
RV901
BRT
RV550
VOL
HEAD
PHONE
J550
CN550
CN202
(HEAD PHONE,BRT/VOL VR)
H
IC600
SWITCHING CONTROL
4
1
6
3
+30V
+5V
D603
D602
D601
D604
-10V
+7.5V
+5V
RV600
Vcc CONT
Q604,605
Vcc OUT
Q601
SW REG OUT
Q600
UN4.5V
+30V
+5V
OSC
5
OUT
1
-IN
3
VCC
D605
UN4.5V
D607
7
L401
2
+5V
AFT SW
Q006,007
4
BR/CTL
CONT
Q602
UN4.5V
A/V IN
J801
V BUFFER
Q801
IND SW
Q005,008
15
FILTER
SWF201
UN4.5V
+7.5V
+5V
-10V
CN301
UN4.5V
+30V
+7.5V
+5V
-10V
+30V
CN201
18
17
14
12
10
9
6
4
2
1
7
5
IC501
AUDIO AMP
6
OUTPUT
3
-IN
2
-IN
7
V+
UN4.5V
+5V
2
SP.GND
1
SP
CN501
SPEAKER
D302
-10V
2
9
8
T701
1
3
5
OSC 2
Q702
4
OSC 1
Q701
OSC SW
Q703,704
UN4.5V
UN4.5V
+5V
FR701
CK2A
STHR
CKV
CK1A
STHL
OEH
OEV
STV1
STV2
CK3A
VGH REG
Q303
+30V
34
30
35
15
25
26
35
29
3
39
42
41
36
TUNING
CONTROL
RV201
RF AGC
AUDIO AMP
Q803
J101
EXT ANT
ANT
S601(1/2)
OFF/VHF/UHF
S601(2/2)
OFF/VHF/UHF
DRY
BETTERY
IC001
ELECTRONIC TUNING
IC201
VIF/SIF DET
RV306
VCOM DC
TO
MONITER
(LCD)
+5V
A
B
(Y/C/J,LCD CONTROL)
(TUNER,ELECTRONIC TUNING,VIF,SIF,POWER)
+5V ADJ
V BUFFER
Q202
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