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2. DESCRIPTION
OF MECHANISM
OPERATION
2-1.
BASIC
OPEI?ATIONMODE
OF MECHANISM
The P-90 mechanism
has its original
modes such
as given
in Table
2-1, in addition
to the VTR is
operation
modes
(STOP,
FF, REW, PLAY, REC, R-
SEARCH, F-SEARCH, STILL, SLOW, and ETS). These
modes
specific
to the
mechanism
play
important
roles in tape
protection
operation
at the time of
a shift
to various
modes of the VTR above. A shift
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to the mode specific
to the mechanism
is carried
out by controlling
the rotation
of the loading motor
with the control
signal of the system control circuit.
The detection
of
important
mechanism
operation
mode
positions
is done
by using
the FL START
SWITCH
for
detecting
the
cassette
ejection /
insertion,
and the MECHANISM
MODE SWITCH for
detecting
each mode of the mechanism (3 bit MODE
DATA
is output
by operating
the rotary
switch).
Main Mode Shifting Conditions
Detected by FL
start switch
_ Cassette insertion
through
STOP or PLAY mode
STOP from EJECT
+
_ Pr~rolling
after detecting tape end
with tape end sensor.
POW=
ON-OFF
when
the
h"!
cassette is inserted completely.
c
From
From
PLAY
FF/REW
—
—
—-
Table 2-1
–3–
VTR Oparation
Mode
Low
side
of ~.
Sensed upon IX
Power olr
when
larm
is badcd
completely
STOP,
FF/REW
STILL, SLOW,
F-ADV
PLAY, REC,
F-SEARCH
—.
PAUSE
R-SEARCH
,'.
,,
-.,
.
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