SECTION
1
CIRCUIT
OPERATION
DESCRIPTION
TABLE
OF
CONTENTS
I.
OUTLINE
OF
AA-R SERIES SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . 2
l.
ACCEPTANCE
OF
INPUT
SELECTOR
DATA
. . . . . . . . . . . . . . . . . . 2
2.
FL
DISPLAY
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
3.
SELECTION
OF
INPUT
SIGNAL..
. . . . . . . . . . . . . . . . . . . . . . . . . . 2
4.
VOLUME
CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
5.
TONE
CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
6.
LONG-TIME
BACK-UP
BY
CAPACITOR . . . . . . . . . . . . . . . . . . . . . . 2
11.
OPERATION
OF
AMPLIFIER
SECTION
CONTROL
IC
AA-
I 00
PERIPHERAL
CIRCUIT
. . . . 3
1.
AA-100 PERIPHERAL
BLOCK
DIAGRAM
. . . . . . . . . . . . . . . . . . . . . 3
2.
AAIOO
TERMINALS DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.
DISPLAY
DATA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.
DIGIT OUTPUT
OF
AA-100
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5.
DESCRIPTION OF
INPUT
SELECTOR. . . . . . . . . . . . . . . . . . . . . . . . 8
6.
OPERATION
OF
ELECTRONIC
VOLUME
CONTROL
AND
TONE
CONTROL
10
7.
THE
STATUS
THAT
WILL
BE
ESTABLISHED
WHEN
WHEN
RESET
BUTTON
IS
PRESSED
17
8.
RESET
STATUS
WHEN
POWER
IS
ON
.......................
17
9.
HOW
TO
MAKE
LETTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18
ffl.
OPERATION
OF
TUNER
SECTION
CONTROL
IC
AT-600
PERIPHERAL
CIRCUIT
. . . . 20
I.
BLOCK
DIAGRAM
OF
AT-600
PERIPHERAL . . . . . . . . . . . .
.....
20
2.
AT600
TERMINALS
DESCRIPTION
.........................
22
3.
KEY
MATRIX
AND
TIMING
CHART OF
SIGNAL
FOR
DISPLAY
SELECTION
BLANK
PERIOD . . . .
23
4.
FREQUENCY
DISPLAY
SEGMENT
DATA
....................
23
5.
BLOCK
DIAGRAM
OF
PLL
IC
TC9125P INTERIOR
AND
DESCRIPTION OF
THE
FUNCTION
OF
EACH
TERMINAL . . . .
24
6.
PLL
DATA
FOR
PLL
IC
(TC9125P) CONTROL
.................
25
7.
FREQUENCY
CONTROL
BY
PLL
...........................
27
IV.
AKAi
ZERO
DRIVE
CIRCUIT (AA-R42/R32) . . . . . . . . . . . . . . . . . . . . .
28
I.
IN
THE
BEGINNING
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
28
2.
PRINCIPLE
OF
AKAI
ZERO
DRIVE CIRCUIT . . . . . . . . . . . . . . . . .
28
V.
DUAL-POLE
DC
SERVO (AA-R42/R32/R22) . . . . . . . . . . . . . . . . . . . . .
31
----------.SERVICE
MANUAL
AA-R22/L,
AA·R32iL.
AA-R42----------
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