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IC DESCRIPTION
Q Q
IC, GMS3977RAA98F
3 7 6 3 1 5 1 5 0
Pin No.
Pin Name
I/O
End sensor to detect the tape's terminal (Lead taps section).
TAKE UP
1
I
If "H" is detected signal in the REW, REV modes, the mechanism stops and ejects the
SENSOR
cassette automatically.
2
VSS (A/D)
–
GND
END
End sensor to detect tape's terminal (Lead tape section).
3
I
SENSOR
If "H" signal is detected in the FF mode, then REW mode will occur automatically.
1. When the tape is transporting. Reel pulses are input.
2. If the tape is transporting and take-up reel pulses are not input during regular time,
the unit stops at STOP point automatically.
Each operating mode
4
TAKE UP REEL
I
3. Distinguishes the tape type, counts the tape remaining and reduces the tape speed at
the end of FF/REW modes.
1. When the tape is transporting, Reel pulses are input.
2. Distinguishes the tape type, counts the tape remaining and reduces the tape speed at
5
SUPPLY REEL
I
the end of FF/REW modes.
3. If supply reel pulses are not detected, FF/REW mode is not operating normally.
T E
L
1 3 9 4 2 2 9 6 5 1 3
And the unit stops at stop point automatically. (Refer to table of pin 17.)
1. Input signal for checking MTS MODE.
6
MTS IN
I
2. Mono: 0 ~ 0.4 V, Mono-SAP: 0.8 ~ 1.4, ST: 1.8 ~ 2.4, ST + SAP: 2.8V~
7
LEVEL METER "L"
I
Audio "L" signal input for driving level meter on FDP.
8
LEVEL METER "R"
I
Audio "R" signal input for driving level meter on FDP.
Port to detect AFT (+)'s state during tuning. When more than 4V, is detected by AFT
(+) detector.
9
AFT
I
Detects AFT (–)'s state during tuning. When less than 0.96V, is detected by AFT (–)
detector.
A DC bias level set by VR501 determines the pulse width of PG M.M for H. S/W 30
10
PG ADJ
I
switching interval.
Input signal to detect Hi-Fi signal. Main signal to perform auto tracking mode.
11
A.ENV
I
V.ENV signal is the sub signal.
1. Reference input signal to perform auto tracking mode.
Video envelope (F/F) signal is input through LPF.
2. Perform auto tracking mode by sampling video envelope signal which is input
12
V.ENV
I
during a period of head switching and changing servo tracking data to obtain
maximum value.
w w w
Note : When the DC level of the envelope is at its maximum, it is considered tracking
properly.
13
KEY RTN 0
I
KEY RTN 0
Description
Sec
PLAY, REC
SP=3 EP/LP=6
FF, (REW)
2
CUE, (REV)
1
x
a o
y
.
i
37
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8
Pin No.
Pin Name
14
KEY RTN 1
Q
Q
3
7
6
3
15
VCC(A/D)
16
RESET
17
CTL GAIN ADJ
18
JUST CLOCK IN
19
LD (–)
20
LD (+)
u 1 6 3
.
21
HSR "H" (24V)
22
Vcc(SYS)
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2
4
9
9
8
I/O
Description
No.
KEY NAME
A/D RANGE
1
SP/EP
0.0V ~ 0.45V
2
CH UP
0.46V ~ 0.96V
3
CH DOWN
0.97V ~ 1.47V
4
STOP/EJECT
1.48V ~ 1.97V
5
REC/ITR
1.99V ~ 2.48V
KEY RTN1
No.
KEY NAME
A/D RANGE
1
PAUSE
0.0V ~ 0.45V
I
2
FF
0.46V ~ 0.96V
3
REW
0.97V ~ 1.47V
4
PLAY
1.48V ~ 1.97V
5
POWER
1.99V ~ 2.48V
1. Input detector port of A/D input key. Samples 256 steps with AVcc in the center and
confirms which key is pressed by the input voltage.
2. Key voltage table.
3. Excluding above item's key sfter receiving, detecting and amplifying the remocon
data from the remocon receiver (RC5F1), decodes input signals from µ-COM (pin
1
5
1
5
0
8
9
2
4
82), performs its key operation.
–
A/D Vcc.
1. Initially 5.3 VA is applied to Vcc pin 22 of µ-COM.
This pulses is applied to clear the RAM inside the µ-COM and to reset programs to
0000H in ROM.
2. Reset timing pulse.
I
Vcc
t
5.3VA
3.1V
1.5V
t
RESET
PULSE
RESET Period
O
Output "H" port to CTL gain control in FF/REW mode.
I
Input signal for automatic clock setting
1. Output signal to IC502 for control of the loading motor's direction of rotation.
2. Control table of loading motor's driving direction.
Pin 19
Pin20
Rotation of Loading Motor
O
H
H
Brake Mode.
m
H
L
Reverse Direction.
L
H
Forward Direction.
c o
O
Switches capstan Vcc to 24 V for high speed rewind.
–
SYSCON Vcc.
38
2
9
9
9
8
2
9
9
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