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SECTION 5
DIAGRAMS
– 7 –
5-1.
IC PIN FUNCTION DESCRIPTION
MAIN BOARD IC101 M38172M4-180FP (SYSTEM CONTROL)
Pin No.
Pin Name
I/O
Function
1
—
—
Not used (Fixed at “L”)
2
—
—
3
KEY-X
I
Key input (A/D convert input) *1
4
KEY-Y
I
5
FWD TAB
I
REC proof detection input from S902 (FWD side)
“H”: Not nail
6
CHROM SW
I
Tape type detection input from S903
“L”: Type I
7
RVS TAB
I
REC proof detection input from S904 (REV side)
“H”: Not nail
8
—
—
Not used (Fixed at “L”)
9
PLAY SW
I
Playback and stop detection input from S907
“L”: Playback
10
TEST MODE
I
Test mode terminal
Normal: “H”
Test mode: “L”
11
POWER OUT
O
Audio and mechanism power on/off output
“L”: Off (Not used)
12
POWER IN
I
Primary power on/off input
“H”: On
13
CLOSE
O
Loading motor (M901) drive output *2
14
OPEN
O
15
—
—
16
—
—
17
—
—
Not used (Fixed at “L”)
18
—
—
19
—
—
20
—
—
21
(CLOCK)
O
Not used (Open)
22
(DATA)
O
Not used (Fixed at “H”)
23
RELAY
O
Relay drive output
“L”: ON
24
BIAS
O
Control output to recording bias switch (Q352)
“L”: ON
25
AU BUS OUT
O
Audio bus output
26
AU BUS IN
I
Audio bus input
27
RESET
I
Reset input
28
X CIN
I
Not used (Fixed at “L”)
29
X COUT
O
Not used (Open)
30
X IN
I
Main system clock input (4 MHz)
31
XOUT
O
Main system clock output (4 MHz)
32
Vss
—
Ground
33
REC MUTE
O
Recording mute on/off control output
“L”: Mute on
34
LINE MUTE
O
Line mute on/off control output
“L”: Mute on
35
—
—
Not used (Fixed at “L”)
36
PB MUTE
O
Playback mute on/off control output
“L”: Mute on
37
REC/PB
O
Mode control output to DOLBY NR amplifier (IC301)
When recording: “H”
38
—
—
Not used (Open)
39
—
—
40
—
—
Not used (Fixed at “L”)
41
POWER
O
Control output to ON/STANDBY LED (D857)
42
TAPE
O
Control output to TAPE LED (D856)
43
CD SYNC
O
Control output to CD SYNC LED (D855)
44
REC
O
Control output to REC LED (D854)
45
PAUSE
O
Control output to PAUSE (
∏) LED (D853)
46
REV
O
Control output to REV (
ª) LED (D852)
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