Goldstar ffh-2000ax Service Manual ic
- 33 -
INTERNAL BLOCK DIAGRAM OF ICs
■ LA1837
FM SD
ADJ
3 rd 5 th
DECODER
ANTI-BIRDIE
FM
BLOCK DIAGRAM
Pin Functions
- 34 -- 34 -
- 35 -
- 36 -
Pre Out
Ch2
3.3µF
3.3µF
3.3µF
3.3µF
3.3µF
1000µF
1000µF
47µF
47µF
47µF
0.018µF
1000µF
3.3µF
47µF
1.2µF
100
µF
R . R
Vcc
1000
µF
47µF
0.018µF
10kΩ
10kΩ
150kΩ
150kΩ
1MΩ
2.2kΩ
2.2kΩ
Rec IN
Ch2
Rec
IN
Rec IN
Ch1
ALC
Rec Out
Ch2
180kΩ
180kΩ
Gv
Gvo
180kΩ
180kΩ
1kΩ
1kΩ
1kΩ
1kΩ
100kΩ
100Ω
10kΩ
10kΩ
10Ω
300kΩ
9.1kΩ
100Ω
Pre IN
Ch2/B
(Play Rec)
Pre IN
Ch2/A
(Play only)
Pre IN
Ch1/B
(Play Rec)
Pre Out
Ch1
Pre IN
Ch1/A
Ch1/B
NF
Ch2/A
Ch1/A
Ch1/B
Gvo
Gv
Gvo
Gv
Vcc
M
N
NF
NF
Ch1
Ch1
Ch2
Gvc
GV
Ch2
ALC
GND
Rec
15
14
13
12
11
23
24
1
2
161718192122
IN
Vref1
Vref
Vref2
A/B
Metal
Out
Pre
Out
REC
Out
Rec Out
Ch1
Mix
Out
GND1 M/N
6.8kΩ
A
B
1000pF
1000pF
6.8kΩ
9.1kΩ
20
10 9876435
M/N
■ KIA6289N
■ KA8301
DRIVER
PRE
LOGIC
23456789101
GND
Vout1
Vz1VrFin
Rin
Vcc1
Vcc2
Vz2
Vout2
- 37 -
■ KIA7805 P/PI ~ KIA7824P/PI
3
1
2
4
R
12
R
1
C
21
R
12
Q
1
Q
7
Q
13
Q
10
Q
6
Q
5
Q
4
Q
3
Q
11
Q
15
Q
14
Q
9
Q
8
Q
16
Q
17
Q
INPUT
OUTPUT
GND
2
Q
1
Z
18
R
8
R
9
R
13
R
11
R
17
R
5
R
6
R
1
R
2
RR
16
R
20
R
19
R
14
R
10
R
7
R
- 38 -
■ KB9224
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