VS-DT9R/VS-DT6R
1-26
1. Terminal layout & Block diagram
LA1838 (IC1) : FM AM IF amplifier & Detector, FM MPX Decoder
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
FM IN
AM MIX
FM IF
AM IF
GND
TUNED
STEREO
VCC
FM DET
AM SD
FM VSM
AM VSM
MUTE/IFOUT
FM/AM
MONO/ST
LOUT
ROUT
LIN
RIN
RO
LO
MPX IN
FM OUT
AM DET
AM AGC
AFC
AM RF
REG
AM OSC
OSC BUFFER
I
O
I
I
-
O
O
-
-
-
O
O
I/O
I
O
O
O
I
I
O
O
I
O
O
I
-
I
O
-
O
This is an input terminal of FM IF signal.
This is an out put terminal for AM mixer.
Bypass of FM IF
Input of AM IF Signal.
This is the device ground terminal.
When the set is tunning,this terminal becomes "L".
Stereo indicator output. Stereo "L", Mono: "H"
This is the power supply terminal.
FM detect transformer.
This is a terminal of AM ceramic filter.
Adjust FM SD sensitivity.
Adjust AM SD sensitivity.
When the signal of IF REQ of IC121(LC72131) appear, the signal of FM/AM IF output.
Muting control input.
Change over the FM/AM input. "H" :FM, "L" : AM
Stereo : "H", Mono: "L"
Left channel signal output.
Right channel signal output.
Input terminal of the Left channel post AMP.
Input terminal of the Right channel post AMP.
Mpx Right channel signal output.
Mpx Left channel signal output.
Mpx input terminal
FM detection output.
AM detection output.
This is an AGC voltage input terminal for AM.
This is an output terminal of voltage for FM-AFC.
AM RF signal input.
Register value between pin 26 and pin28 besides the frequency width of the input signal.
This is a terminal of AM Local oscillation circuit.
AM Local oscillation Signal output.
Pin No.
Symbol
I/O
Function
ALC
BUFF
AM
OSC
REG
AM
MIX
FM
RF.AMP
AGC
AM IF
DET
SD
COMP
AM
S-METER
FM
S-METER
FM IF
PM
DET
S-CLRVE
AM/FM
IF-BUFF
TUNING
DRIVE
GND
VCC
STEREO
DRIVE
MUTE
DECODER
ANIT-BIRDIE
STEREO
5N
SW
P-DET
PILOT
DET
FF
19k
FF
19k
FF
38k
VCO
384KHz
/ 2
/LS
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
1
2
3
4
6
7
8
9
10
11
12
13
14
15
5
2. Pin function
Содержание CA-VSDT6R
Страница 42: ...VS DT9R VS DT6R 3 2 M E M O ...
Страница 57: ...3 17 VS DT9R VS DT6R M E M O ...