Goldstar ffh-8900a Service Manual internal block diagram of ics
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BU2090/BU2090F/BU2090FS/BU2092/BU2092F
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KIA78XXPI
INTERNAL BLOCK DIAGRAM OF ICs
- 27 -
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KIA6289N
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TDA7439
- 28 -
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KIA4558P, KIA4558F
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KA8301
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BA3126N
DRIVER
PRE
LOGIC
23456789101
GND
Vout1
Vz1VrFin
Rin
Vcc1
Vcc2
Vz2
Vout2
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KA3010
PIN DESCRIPTION
28 27
26 25 24 23 22
T S D
REGULATOR
MUTE
LEVEL
SHIFT
LEVEL
SHIFT
100K
50K
50K
10K
10K
10K 10K
10K
BUY
BUY
BUY
LEVEL
SHIFT
LEVEL
SHIFT
1234567
8 9 10 11 12 13 14
21 20 19 18 17 16 15
Pin No. Symbol I/O Description
1 DO1.1 O DRIVE OUTPUT
2 DO1.2 O DRIVE OUTPUT
3 DI1.1 I DRIVE INPUT
4 DI1.2 I DRIVE INPUT
5 REG REGULATOR
6 REO O REGULATOR OUTPUT
7 MUTE MUTE
8 GND1 GROUND
9 DI2.1 I DRIVE INPUT
10 DI2.2 I DRIVE INPUT
11 DO2.1 O DRIVE OUTPUT
12 DO2.2 O DRIVE OUTPUT
13 GND2 GROUND
14 OPOUT O OPAMP OUTPUT
15 OPIN (-) I OPAMP OUTPUT (-)
16 OPIN (+) I OPAMP INPUT (+)
17 DO3.1 O DRIVE OUTPUT
18 DO3.2 O DRIVE OUTPUT
19 DI3.1 I DRIVE INPUT
20 DI3.2 I DRIVE INPUT
21 VCC1 SUPPLY VOLTAGE
22 VCC2 SUPPLY VOLTAGE
23 VREF 2.5V BIAS VOLTAGE
24 DI4.1 I DRIVE INPUT
25 DI4.2 I DRIVE INPUT
26 DO4.1 O DRIVE OUTPUT
27 DO4.2 O DRIVE OUTPUT
28 GND3 GROUND
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