Integrated Circuit Diagrams - Bose BUILT-INvisible TA-1 Service Manual

INTEGRATED CIRCUIT DIAGRAMS

TOP-VIEW
+Vs (signal)
TDA7294
2
-
IN-
3
+
IN+
4
IN+MUTE
10
MUTE MUTE
9
STANDBY
STANDBY
1
STANDBY
-Vs (signal)
GROUND
Bose ® P/N: 170156, Power Amplifier,
Audio, TDA7294
Bose P/N: 137927, Voltage Regulator,
LM317T
Bose P/N: 137928, Voltage Regulator,
LM337T
Pin Function
15 15. -Vs (Power)
14 14. OUT
13 13. +Vs (Power)
12 12. N.C.
11 11. N.C.
10 10. MUTE
9 9. STAND-BY
8. -VS (Signal)
8
7
7. +VS (Signal)
6
6. Bootstrap
5 5. N.C.
4. SVR
4
3 3. Non-Inverting Input
2 2. Inverting Input
1. Stand-by Gnd.
1
+Vs (power)
7
13
14
6
SHORT-
THERMAL
CIRCUIT
SHUTDOWN
PROTECTION
15
8
-Vs (power)
1
A
2
- +
3
4
Bose P/N: 146820, Dual Op-amp, NJM2082
1
2
A
OUT
- +
3
BOOT-
4
STRAP
Bose P/N: 148584, Dual Op-amp w/switch,
1
A
2
- +
3
+
4
Bose P/N: 148598, Dual Op-amp, NJM4556
1
2
A
- +
3
4
5
- +
6 B
7
Bose P/N: 186112, Quad Op-amp, TL074
57
Pin Function
8
1. A Output
2. A Inverting Input
7
3. A Non-inverting Input
4. V-
B
6
5. B Non-inverting Input
-
+
6. B Inverting Input
5
7. B Output
8. V+
Pin Function
8
1. A Output
2. A Inverting Input
B 7
3. A Non-inverting Input
-
+
4. GND
6
5. B Non-inverting Input
6. B Inverting Input
5
7. B Output
8. V+
LM393
Pin Function
8
1. A Output
2. A Inverting Input
7
3. A Non-inverting Input
4. V-
B
6
5. B Non-inverting Input
-
6. B Inverting Input
5
7. B Output
8. V+
PIN FUNCTION
1. A OUTPUT
14
2. A -INPUT
3. A +INPUT
13
D
+ -
4. +Vcc
12 5. B +INPUT
6. B -INPUT
11
7. B OUTPUT
8. C OUTPUT
10
9. C -INPUT
+ -
10. C +INPUT
C
9
11. -Vcc
12. D +INPUT
8
13. D -INPUT
14. D OUTPUT