Akai F 7 L Schematic

Page 2

BA6109

PRE

DRIVER |

LA123IN
Ir ———————————————————— @——@——O ————————————— 1
I I
| CONSTANT VOLTAGE QUADRATURE I
I CIRCUIT LIMITTER AFC/TUNING (JD
' METER DRIVE I
I IF AMP/LIMITTER I I
®——> OUADRATURE '
IsI 2nd 3rd 4m 5m em I
L._ DETECTION
AF AMP —(:)
———J ______ I
I—l I—I MUTE @
CONTROL
LEVEL LEVEL LEVEL INV. LEVEL DC LEVEL ‘_
DETECT DETECT DETECT AMP DETECT DETECTION

STOP

DRIVE

I
I
I
|
(:9; IF AMP SIGNAL METER
I .

IF Vcc AM OUT IF GND

62

—-— —-- ——- __l

l

l

|

BUF OSC ALC AGC SM DET l

1 I

|

I

I

|

RF MIX I

I

I

___ ___@___ ___ 7 ___o___ ___ ®__J
AM IN RF GNU RF Vcc

SCHEMATIC DIAGRAM FD-7/L, FP-7

Page 10

NE652

HIGH LEVEL STAGE OUTPUT
HIGH LEVEL STAGE INPUT (2

Ac GROUND HIGH LEVEL STAGE (3

HIGH LEVEL STAGE SIDE CHAIN <4)——-

EQ—
GROUND (5}———

Wk
Low LEVEL STAGE SIDE CHAIN s ,

AC GROUND LOW LEVEL STAGEQ

LOW LEVEL STAGE IN

RECORD OUTPUT

NE654
Record input
RECORD
AMP
MPX—Iiiler inpm +
MPX—filier output
C/B/OFF
Mode BIC/NR OFF
swich inpul
Line oufipul
BUFFER
AMP
Speclrol skewing nelwork
Speciral skewmg network
. switch
I
( Anli-salurmian filler

sw Itch

Playback Input

Anii-sovurolion filler

Ami —sa1u ration Ii Iier
inpul

Record/playbook
swilch inpul

70

[EWER SUPPLY I

|
I
RECORD/PLAY J

SCHEMAIC DIAGRAM FD-7/L, FP-7

® HIGH LEVEL STAGE HIGH PASS FILTER

LOW LEVEL STAGE INTEGRATING FILTER

LOW LEVEL STAGE HIGH PASS FILTER

Inleqroling filter swilch
Iniegrcling filler swiich
Side chain filler switch

I Reference voltage
High level sloqe output J

I9 High level siege main
chain input

18 High level since side
chain inpui

GND 7 Ground

Low level slag: side
chain inpul

IS Low level since main
chain inpui

I4 Record output

3 Vet