Akai AP-M7

Vv.
CIRCUIT
DESCRIPTION
5-1.
THE
PERIPHERAL
CIRCUIT
DIAGRAM
OF
MI-COM
(ICS
LM6502A-111)
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ot
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TRANSPORT
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KEY BOARD PCB
Fig. 5-1
5-2.
DESCRIPTION
OF
MI-COM
ICS
(LM6502A-111)
TERMINALS
Pin
No.
|
Symbol
Description
1
Xtal
Crystal
OSC
input
(400
kHz)
2:
co
Muting
at
“H’
(“L”
while
the
stylus
is
on
the
record)
3
cl
‘Tracking
Sensor
ON/OFF
signal
output,
Tracking
Sensor
is
ON
at
“L”
while
playing
the
record and OFF at “H” in the other conditions.
4
C2
Plunger
High
Drive
output,
“H’”
when
Tone
Arm
rises
and
while
Tone
Arm
is
up,
“L”
for 1.6
sec
after
Tone
Arm
starts
to
descend
and
“H”
after
that
1.6
sec.
5 c3 Plunger Drive output,
“H” when Tone Arm rises and while Tone Arm is up.
“L” when Tone Arm descends and while Tone Arm is down.
6
INT
Frequency
Generator
signal
input.
40
msec
(33-1/3
rpm),
30
msec
(45
rpm)
T,
RES
Reset
at
“L”
when
power
is
turned
on.
8
DO
Arm
Motor
Reverse
output,
“L”
only
While
Tone
Arm
is
moving
away
from
the
Spindle.
9
DI
Arm
Motor
Forward
output,
“L”
only
while
Tone
Arm
is
moving
towards
the
Spindle.
10
D2
Main
Motor
ON/OFF
output,
“H” at Stop mode
“L” at Play mode
———
SERVICE
MANUAL
AP-M7/S———
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8