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6-4. IC PIN FUNCTION DESCRIPTION
• MAIN BOARD IC701 MSM6576-83GS-K (SYSTEM CONTROLLER)
Pin No. Pin Name I/O Function
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
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