JVC CA-C55BK - IC Descriptions - FM AM IF AMP & Detector; LA1266 A (IC104) Function, Layout, and Description

XT-C55BK
BH LA1266A(1C104): FM AM IF AMP & detector
4. The main function descriptions
(1) Amplify and detect of FM intermodulation frequencies.
(2) It has local oscillator and mixer for AM, and amplify the AM-IF signal.
2. Top View 3. Block Diagram
AM AM AM FM FM
eM-ir C4 24, J AM-OSC out Mix — IF IF STRQ IF -in Bypass FM-DET Vec
Bypass 2 23-2 AM-OSC Bf] ___ i B).._ 5)
Bypass C13 22P\V.ref ris earn aaa Vania (aca lala ~-tp-lp------ ae!
i 1 1
Gnp
C4
21LJ
AM
in
i
i
em-peT C5 200] AM-Mix 1
em-pet C16 191 AM-AGC I FM-IF | a0 | Post Amp. FM out
Vee 18] AM-IF :
sig C18 7AM Adj. \ 19] FM arc
em-arc C19 16[ FM Adj 1 1
emir L410 15f7AM out ! > DET 15] AM out
am-tf
C411
147]
NAR
SM
1
i
rM-out L412 131 sTRQ \ 1
t 1
| |
1
LED
1
! — prer [mf] tuned to,
I Band width !
ae eens [Eaeaetro [RRO cae Pel ieee eemens peal eeverersee _ 4 NOSig. +H
zz 4] ii9| ig] Sig.>L
AM AM-OSC AM-OSC NAR AGC AM FM GND
-in in out SM Adj Adj
4. Description
Description
| 1 [This is an input terminal of FM IF Signal. .
Bypass of FM IF Amp.
GND | -—- | This is the device ground terminal.
FM DET FM detect transformer
| 4
| 5.6 |
| 8 {SIGNAL
| 9
| 10 |
a
FM IF
AM IF
fe EM out
| 13 | STRQ i - ile thi i “High”.
11
12
E Ti [The Iesignals come out from pinto (FMF) or pinit (AMF) while this terminal goes to “High”. _|
NAR SM | | Control the Band-width of AM signal meter.
15 |
| O | Mute drive and signal stop drive output when tuning. Active Low
FM AFC | O | This is an output terminal of voltage for FM - AFC
ete | AM out | O | AM detection output.
FM Adj | — | For adjust the stop level (or mute level) of FM.
| 17 AM Adj |---| For adjust the stop level (or mute level) of AM.
AN
ANCAGE [1 [This i an AGC voltage Input temminal fr AM SS
20 [aNewix [0 [This an output terminal for AM mien SSS
F217 AWEN LT [This an input terminal for AM RF Signal SSS
ae] viket [= [control the andhwidth of Ft signal meter SSCS
21
22
23 =
war oO | AM Local Oscillation Signal output.
3-12 (No.20474)