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6-4.
IC PIN FUNCTION DESCRIPTION
•
MAIN BOARD IC701 MSM6576-83GS-K (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Description
1
M.CTL
O
The output terminal for the control signal to start the motor
Turn the motor when set to “H”
2
M.DIR
O
The output terminal for selecting the rotating direction of the motor
Turn the motor counterclockwise when set to “H”, and clockwise when set to “L”
3
M.BRK
O
The output terminal for the brake signal to be applied to the motor
Turn the brake on when set to “H”
4
RESET
I
System reset signal input from the reset signal generator (IC703) “H”: reset
5
TEST1
I
6
TEST2
I
The input terminal for the test (fixed at “L”)
7
TEST3
I
8
L.DOLBY
O
The output terminal for the LED drive signal of the
a
NR indicator (D708)
“H”: LED on
9
L.AVLS
O
The output terminal for the LED drive signal of the AVLS indicator (D707) “H”: LED on
10
L.BATT
O
The output terminal for the LED drive signal of the BATT indicator (D703) “H”: LED on
11
L.BLSKIP
O
The output terminal for the LED drive signal of the BL SKIP indicator (D706)
“H”: LED on
12
MUTE CTL
O
The output terminal of the muting signal “L”: mute on
13
PM CTL
O
The output terminal for the plunger drive signal “H”: plunger on
14
PHOTO CTL
O
Control signal output to the motor rotation detect circuit “H”: rotation detect circuit on
15
XTB
—
Connected to crystal oscillator (X701 32.768 kHz) for the system clock
16
XT
—
Connected to crystal oscillator (X701 32.768 kHz) for the system clock
17
VDD
—
Power supply terminal (+1.5V)
18
VSS1
—
Ground terminal
19
VCM
—
20
VCP
—
21
VSS2
—
22
VEE
—
23
SET STOP1
I
Battery voltage detect input terminal Middle point voltage (+0.75V) input in this set
24
SET STOP2
I
Battery voltage detect input terminal
25
KEY IN
I
Key input terminal (A/D input)
26
HOLDER SW
I
Cassette holder open/close detect switch (S701) input terminal
“H”: cassette holder close, “L”: cassette holder open
27
BEEP
O
Beep sound signal output terminal (frequency: 1.6 kHz)
28
AMS IN
I
AMS (Automatic Music Sensor) control signal input from the TA2072AF (IC301)
29
RMUM
I
Communication request signal input from the remote commander
30
DATA
O
Serial data output to the remote commander
31
DOLBY CTL
O
Dolby NR on/off control signal output to the TA2072AF (IC301) “H”: dolby NR on
32
DDC CTL
O
Control signal output to the DC/DC converter circuit “H”: power on
33
F/R CTL
O
FWD/REV selection signal output to the TA2072AF (IC301) “H”: FWD, “L”: REV
34
L.MB
O
The output terminal for the LED drive signal of the SOUND MB indicator (D705)
“H”: LED on
35
L.GRV
O
The output terminal for the LED drive signal of the SOUND GRV indicator (D704)
“H”: LED on
36
FWD SW
I
Tape direction switch (S702) input terminal “H”: FWD
37
REV SW
I
Tape direction switch (S702) input terminal “H”: REV
38
PHOTO IN
I
Detection signal input from the motor rotation detect circuit
Increases power supply voltage
