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2.
8mm System Control Microprocessor (IC0901)
Active
Abbreviation
Function
No.
Level
1
O
|Lo
CH2. REC{Lo
Not used.
Open.
2
Q_|Lo
CH1. REC/Lo
3
Q_ | (Pulse)
| SW30[Lo}
Antiphase head switching pulse (SW30 or SW25) output.
4
Q__|
(Pulse)
| SW30(25)
Head switching pulse (SW30 or SW25) output.
6
O_|
Hi
FMAG1
Not used. Open.
7
I
Hi
ADP DET
AC adapter connection detection input.
8
|
Hi/Lo
PRE V
Lithium battery attachment and voltage detection input.
(Not attached or less than 2.5V: Hi, Attached: Lo)
9
|
Lo
EXT BATT
Battery attachment detection input.
11
| | OV-3V_
{|M-SW1
12
| | OV-3V_
[M-SWO
17
|
Hi/Lo
ME/MP[Lo]
Input to discriminate the type of tape.
Hi: ME (metal evaporated) tape, Lo: MP (metal particle) tape.
fal}
PHOTOJLo
CHG LED(EXT)
LCD. BL
Outputs "Hi" during charging to control Q0732 (CHG LED DRIVE) so that the
CHARGE LED (LEDO751) lights.
Not used.
Open.
MUTE
Audio muting output. Outputs "Hi" to mute sound.
O|O!|O
:
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a \o @)
CAM[Lo//LINE
Not used.
Open.
END LED
Not used. Open.
Grounded.
RESETILo]
Microprocessor reset input. "Lo" input resets the microprocessor.
GND
Grounded.
Drive X0901 to generate 12MHz main clock pulses.
O | (Pulse)
| XTAL OUT
12MHz
| | (Pulse)
| EXTAL IN
12MHz
—7
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