Door
Lock
Latch
Option
(Fig.
2
-
12
)
This
option can be used if the IN USE
Option
is
already
installed. Then,
the door
lock
latch
option
will allow the latching
of the
door
lock solenoid under control
of
the
SELECT
and IN USE
signals without
maintaining
the
IN USE
signal activated. The IN USE-FF
stores the
state of
the
IN USE- signal when
the drive is selected
(see
Fig.
2
-
13
).
The
door lock
solenoid
remain activated even
if
the mini
disk
drive
is
deselected and
the
IN USE-
signal is deactivated. To unlock the
door the mini disk drive
must
be
selected a-
gain
with IN USE inactive (low). To enable
the Door
Lock Latch
Option a
jumper must be
installed on JJ2
between
Pin
11 and 12.
IN
USE
Option
Pin
34
of
the
interface
can be
used
for
the
In Use
option
if JJ2 is jumpered
from
Pin 13
to
14.
The
IN
USE- Signal
is
used
to
turn
on
the door lock
solenoid, also
the
IN
USE
sig-
nal
can be
used to turn on
the
activity
LED.
If the IN USE
option is used
the
DISK
CHANGE
Option must be disabled
by
removing
the
jumper on JJ2
between PIN 11
and 12.
jj:
'
ii
IN
USE/i
DISK
I
CHANGE
/I
131
14
A me
12
o-f
{>
TN
USE-
FF
4,
I/O
ENA
«—
D
Q
C
QL.
K
JJA
Jol
I
I
J2I
i
_ _ J
POWER
ON
RESET/
DOOR
LOCK
ENA
Write
Protect Option
This
option
allows
the user to decide
by
set-
ting
of
jumpers
in
which
fashion the mini
disk
is protected against overwriting.
He can
selecting
that the mini disk
is
protected
either if the Notch
are open or if the notch
is
covered
as shown
on
the following
table.
JUMPER NOTCH OPEN
NOTCH COVERED
REMARKS
JJ4:3-4
JJ3:5-6
unprotected
protected Shuga it
JJ3:3-4
protected
unprotected
ECMA-Norm
FIGURE
2
-
12 .
DOOR LOCK LATCH
OPTION
TABLE
2-3
. WRITE
PROTECT JUMPERING
IN USE
I
NT.
SELECT
IN
USE FF
Front Door
unipcKea
'Wked
if Lni
ocKeo
FIGURE
2
-
13
.
TIMING
DIAGRAM
DOOR
LOCK
LATCH
OPTION
Stepper Motor
Switching
The
stepper motor
can
be switched on and
off
by the
MOTOR
ON-
signal,
if
there
is a jumper
installed
between
JJ4
Pin
3
and
4.
If this
jumper
is
installed
the mini disk drive
must
be
repositioned
by a
recalibrate
operation
every
time
the drive
and
stepper
motor
are
turned
on.
2-9
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