Sound Amp - Toshiba MD20FM1 Service Manual

A B
8
7
FROM/TO POWER
6
SOUND_GND
B301
SOUND+B
W4BRH3.5X6X1
GND
P.CON+9V
P.CON+A5V
FROM/TO MICON/TUNER
R302
5 POWER_ON_H
A_MUTE
SCL
SDA
4
FROM/TO AV SW
MONITOR_A_R
R301
MONITOR_A_L
FRONT_VIDEO
FRONT_A_L
FRONT_A_R
3
2
NOTE:THE DC VOLTAGE AT EACH PART WAS MEASURED NOTE: THIS SCHEMATIC DIAGRAM IS THE LATEST AT THE TIME
1
OF PRINTING AND SUBJECT TO CHANGE WITHOUT NOTICE
WITH THE DIGITAL TESTER WHEN THE COLOR BROADCAST
WAS RECEIVED IN GOOD CONDITION AND PICTURE IS NORMAL.
A B
G-15
C
SOUND AMP SCHEMATIC DIAGRAM
SOUND_AMP IC
IC302 AN7522
+ -
L R
1 2 3 4 5 6 7 8
8.0 4.6 0 4.6 4.5 1.4 0 1.4
C307 C348
0.01 0.01
B B
HS301
763WAA0199
0
R326
0 MUTE
Q301
100
2SC2412K
2.0
68K
R319
R318 100 1/4W
100 1/4W
C311 R310
0.033 B 1.8K
R303 C309 C315 C317
3.3K 50V 2.2 KA 0.022 B 0.47 B
3.3K
4.4 4.4 4.4 4.4 4.3 4.3 4.4 0 4.0
1 2 3 4 5 6 7 8 9
VR5
1.8K VR3 TONE
136K
AMP1
+ I2C BUS
REF
-
INTERFACE
+
VR1
-
SIMAMP1
+
-
VOLAMP1
REF 6.5K
6.5K 6.5K
VOLAMP2
+
REF
- CONTROL
-
SIMAMP2
6.5K +
VR2
-
+ TONE
136K
1.8K VR4 AMP2
VR6
20 19 18 17 16 15 14 13 12
9.0 4.4 4.4 4.4 4.3 4.3 4.4 0 5.2
C302
L302 50V 2.2 KA C316 C318 R320
100uH
0.022 B 0.47 B 100K
0305
1/4W
C314 R312
0.033 B 1.8K C320
0.1
MMTV
L303
100uH 0305
CAUTION: SINCE THESE PARTS MARKED BY
CRITICAL FOR SAFETY,USE ONES
DESCRIBED IN PARTS LIST ONLY
C
D E
(AV PCB)
- +
9 10 11 12
2.0 4.4 0 4.4
37 38
0 MUTE
R322
Q304
0
2SC2412K
100
0
C337
0 MUTE
R321
Q303
0
1 B
2SC2412K
100
0
C340
1 B
C324
100P CH
C321 R317
100P CH 8.2K
C319 R313
50V 2.2 KA 1K
4.3
10
LOGIC
R324
11
5.2
8.2K
C327 R325
50V 2.2 KA
1K
ATTENTION: LES PIECES REPAREES PAR UN ETANT
ARE
DANGEREUSES AN POINT DE VUE SECURITE
N'UTILISER QUE CELLS DECRITES
DANS LA NOMENCLATURE DES PIECES
D E
F G
FROM/TO JACK/LED/OPERATION
CP303
A2001WV2-11P
FRONT VIDEO IN 1
GND 2
FRONT A IN L 3
SOUND GND 4
SOUND OUT L 5
SP OUT L 6
GND 7
FRONT A IN R 8
NC 9
SOUND OUT R 10
SP OUT R 11
AUDIO SIGNAL
CAUTION: DIGITAL TRANSISTOR
AUDIO SIGNAL(PB)
TUNER AUDIO SIGNAL
F G
H
8
7
6
5
4
3
2
PCB250
TMA503
1
H
G-16