JVC RX-230RBK - EON Function Operation; Operating Audio Components; COMPU LINK Remote Control System; Automatic Source Selection

RX-230RBK
M LA1266A (IC 104): FM AM IF AMP & Detector
1.
(1)
(2)
2. Terminal Layout
The main function descriptions
Amplify and detect of FM intermodulation frequencies.
\t has local oscillator and mixer for AM, and amplify the AM-IF signal.
3. Block Diagram
FM
hM fm (iM i M -in Bypass FM-DET Vec
ae: pe eee deere
FM
in
AM-OSC
out
|
|
Bypass AM-OSC
Bypass
V-ref
|
IF
Buffer
IF
Buffer
FM
out
GND AM-in |
FM-DET
05
AM-Mix
l
QIFM
AFC
FM-DET
U6
AM-AGC
AN-IF
DET
FAM
out
Vcc AN-IF | AMI | ik
Tuned
AM
Adj.
|
|
FM-AFC
FM
Adj.
oe
gs
|
FM-IF £1 10 AM out AGC
AM-IF [11 NAR SM
FM-out
O12
STRQ
|
S.Meter
aa
[8]Tuned
IND
l [NO sig'H’
3 7 sig'L'
~ eT Bd ose _ i7 te ~ 4.
AM FM
AM All aM GND
4. Pin Function Description
Pin
No
|
Symbol
/O
Functions
and
Operations
|__| This is an input terminal of FM signal. a
2,3 __ |Bypass --__| Bypass of FM IF Amp.
This is the divice ground terminal.
FM detect transformer.
This is power supply terminal.
O
When the set is tuning,this terminal become 'L’.
M AFC O
| 10 [FMIF out O
| 41 |AMIF out
12 FM out
13 STRQ
14. |INARSM
This is output terminal of voltage for FM-AFC.
When the IF REQ signa! of 1C102(LC7218)applies to pin 13,the signal of FM IF outputs.
lies to pin 13,the signal of AM IF outputs.
O When the IF REQ signal of |1C102(LC7218)a
OQ __|FM detection output.
| 15 |AMout
M adj
M adj
M-IF
M-AGC
M-MIX
M-IN
:
Pit) Pi P| P| P| Pin
we) m mal
M-OSC
AM-OSC out
The IF-signals come out from pin10(FM-IF)or pin11(AM-IF)while this terminal goes to'High’.
Control the Band-width of AM signal meter.
AM detection output.
For adjust the stop level(or mute level)of FM.
For adjust the stop level(or mute level)of AM.
Input of AM IF signal .
This is AGC voltage Input terminal for AM.
This is an output terminal for AM mixer
This is an input terminal for AM RF Signal.
Control the Band-width of FM signal meter.
This is a terminal of AM Local oscillation circuit.
AM Local Oscillation Signal output.