Sony FDL-250T Service Manual page 9

1 2 3 4
A
B
C
D
E
F
G
H
I
– 13 –
5 6 7 8 9
10
11 12 13
– 14 –
ABOARD : IC201 M51348AFP
A BOARD : IC600 MB3800PFV
13 BUFFER
AUDIO OUT 12 GND REFERENCE
VOLTAGE
-IN 1
11 DC F/B SAW-WAVE
E-VDL 14 GENERATOR
1.25V
LIMITER 0.1V
ERROR AMP
FM DET IN. 15 10 SIF IN PWM COMP
FM DET SCP 2 36K
- - OUT PUT
+
+ DRIVE
LIMITER OUT 16 9 Vcc(SIF) +
- CONTROL
0.5V 500
CIRCUIT
VCC 3
AFT OUT 17 AFT VIDEO AMP 8 GND(VIF) DTC 0.6V
0.3V
18 7 IF IN
VIDEO OUT 2ND 1ST
BR/CTL 4
AMP AMP
REF COIL 19 6 IF IN
VIDEO SOFT START
DET S.C.P.
REF COIL 20 5 Vcc(VIF)
AFT COIL 21 AGC 4 RF AGC DELAY
SYNC SEP IN 22 3 RF AGC OUT
SYNC
SEP
SYNC OUT 23 2
AGC FILTER 1
24 IF AGC 1 AGC FILTER 1
IF AGC ADJ
DET
ABOARD : IC001 AN5707NFAP A BOARD : IC501 NJM2070M-TE2
STOP DEF CHCAL DBRT L/H U/V
13 14 15 17 7 27
1 8
NC NC
DEFEAT
OUT BAND
AFC 5 COMPARATOR
SW
BIAS 7 V+
+INPUT 2
TUNINNG
H.P. 3 BS ADD 28 BS
PULSE WIDTH CONTROL
SET SIGNAL
M.M. 2
DET
+
H.syn 4 -INPUT 3 6
30 V OUT OUTPUT
-
INPUT BAR OUTPUT
FH 1 31 U OUT
CONTROL
300 50k
SUD 6 GND
18 UP 4
19 VHP 5 POWER
BAR DISPLAY 100k
GND
POSITION 20 VLP
ADJUST 21 CON
AUTO
RETURN 22 UA
BT GENERATOR
CHARGE/
DISCHARGE
INITIAL RESET
29 9 16 25 32 26 12 10 11 23 24
GND NC NC NC NC BT MANU C.S. CHA VHA VLA
• A BOARD WAVEFORMS
1 2 3
1.0 Vp-p ( H ) 3.5 Vp-p ( H ) 0.8 Vp-p ( H )
– 15 –
8 FB
7 OSC
30K
6 GND
5 OUT
Schematic diagram
B
board /