JVC RC-BX33SL - Description of major IC

LA1824
1 2 3 4 5 6 7 8 9 10 11 12
24 23 22 21 18 16 15 14 13
AM
RF
AM
MIX
AM
OSC
FM
MIX
ST
LED
TUN
LED
FM
IF
AM-IF
S-METER DET
PHASE
COMP
V
CC
2GND2
REG V
CC
1
GND1
AGC
TRIG ST SW VCO FF FFFF
PILOT
DET
FM
RF
20
FM
OSC
19 17
DECODER
DET
Pin No.
1
2
3
4
5
6
7
8
Pin No.
1
2
3
4
5
6
7
8
Function
AM-RF input
Reg
AM-OSC
VCC1
FM-MIX output
GND1
AM-MIX output
Tuning in
dicator
Function
AM-RF input
Reg
AM-OSC
VCC1
FM-MIX output
GND1
AM-MIX output
Tuning in
dicator
Pin No.
9
10
11
12
13
14
15
16
Pin No.
9
10
11
12
13
14
15
16
Function
AM-IF output
FM-IF input
AM-IF input
AM-AGC
FM-DET
Pilot detector filter
AM/FM Switch
L output
Function
AM-IF output
FM-IF input
AM-IF input
AM-AGC
FM-DET
Pilot detector filter
AM/FM Switch
L output
Pin No.
17
18
19
20
21
22
23
24
Pin No.
17
18
19
20
21
22
23
24
Function
R output
MPX input
AM/FM detector output
FM-OSC
VCC2
FM-RF output
GND2
FM-RF input
Function
R output
MPX input
AM/FM detector output
FM-OSC
VCC2
FM-RF output
GND2
FM-RF input
Major ICs Description
LA4227
1
2
3
4
5
6
1
2
3
4
5
6
STANDBY
OUT2
BS2
NF2
IN2
DC(FILTER)
STANDBY
OUT2
BS2
NF2
IN2
DC(FILTER)
7
8
9
10
11
12
7
8
9
10
11
12
PRE GND
IN1
NF1
BS1
OUT1
VCC
PRE GND
IN1
NF1
BS1
OUT1
VCC
BIAS
CIRCUIT
-
+
Ch1
THERMAL
SHUT DOWN
PROTECTION
STANDBY
SW
-
+
Ch2
Rf2
20KOHM
RNF2
62KOHM
Rf1
20KOHM
RNF1
62KOHM
12 10
11 9 7
8
1
3
2
4 6
5
STANDBY OUT2 BS2 PWR GND (TAB) NF2
IN2 DC(FILTER)
VCC OUT1 BS1 PWR GND (TAB) NF1 IN1 PRE GND
RC-BX33SL
1-13