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4-2-1 FUNCTION MODE SELECTOR CIRCUIT
Selection of the function mode is controlled
by the pulse timing using a microcomputer.
For easier understanding, one input terminal
@
will be explained as an example. The
terminal
@
receives four ~als, i. e., the
strobe signals from@ ,@
6 @
and~.
Each pulse signal from
@ ,
@ ,
Q§)
and
@
has a different timing. Assuming that the
signals from these terminals are 1000, 0100,
0010 and 0001, signal 1000 of Terminal
@will pass D84, and through the collector of
TR85, it will enter the emitter of TR60.
If FWD (SW3) button is pressed, the base of
TR60 is earthed through R202, TR60 is
energized, and Signal 1000 will be outputted
into Terminal
@
of ICl through D60.
r - - - - - - - - - - - 7
If any input is made into ·@ , it is processed
within the microcomputer depending on the
signal and the signal is outputted from the
respective terminal. If 1000 is inputted into
@ ,
it
is
judged as FWD and the related
signal is inputted to the output terminal.
(See Fig. 6-27). Similarly, Signal
O
100 from@
passes the emitter and collector of TR86 and
enters the Counter P.C Board. When the pro-
gram SW (SW6) is pressed, Signal 0100 is
inputted into 1c1@. Signal 001
O
from@pas-
ses the collector/emitter of TR87, and through
D66 and the reverse selector SW
L__ ,
it is
inputted into ICl
@.
Signal 0001 from
@
passes SRI and SW906 and is inputted into
@.
I
IC-I
~
1,
~
3
1
5
_6 __
F_wo __
6_P_RO_G_RAM __ 6
_C-~ 0
SW906
KEY
SW
REVERSE
:
~
PHo
26
SELECTOR
I
~
I
I
~
I
I
~
L _ _ _ _ _ _ _ _ _
....1
Fig. 6-27
Input to
®
Judgement and Output by Microcomputer
1000
Output H to Terminals(}
2)
,QA),@
and
(25)
of ICl (FWD output order).
0100
Act as clear/program SW only when MEMORY AUTO REV SW is ON.
0010
Act once as a reverse equipment.
(SW 906 is ON and tension arm is locked)
0001
When FWD, REV, FF or RWD key is pressed, process the other signals after making
Terminal
(is)
H.
Fig. 6-29 shows the truth table when the function switches are pressed.
Function SW
T e r m ~
FF
FWD
STOP
12
H
H
13
L
L
14
H
H
15
H
L
16
L
L
17
L
H
24
H
L
25
H
H
Note:
H of Terminal@:
_jl__
H of other Terminals:
_r-
H
L
L
H
L
L
L
L
REV
REW
PAUSE
H
H
H
L
L
L
H
H
L
L
H
L
H
L
L
H
L
H
L
H
L
H
L
L
Fig. 6-28
REC
REC MUTE
REC PAUSE
L
H
a
H
H
a
H
L
L
L
L
L
L
L
L
H
H
ll
L
L
L
H
H
L
Fi~- 6-29
- - - - - - - - - - - - - - - S E R V I C E MANUAL
G X - 7 4 7 d b x - - - - - - - - - - - - - - -
19
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