Interface Connectors; Dust Cover; Free Air Flow; Confined Environment - Tandy 2000 Service Manual

DUST COVER
The design
of
an enclosure should incorporate
a
means
to prevent contamination from
loose items,
e.9., dust,
lint,
and paper chad
since
the drive
does
not
have a dust
cover.
FREE
AIR
FLOW
When the drive is
mounted so the
components
have
access
to the free flow of air, normal
convec-
tion
cooling allows operation over the
specified
temperature range
(see Table 2-3, page
Z-7).
CONFINED ENVIRONMENT
When the drive is mounted
in
a confined environ-
ment,
air
flow
must be provided
to
maintain
specified
air
temperatures
in
the vicinity
of
the
motors and the circuit
boards.
3.4
INTERFACE CONNECTORS
The electrical interface
between the drive and
the
host
system
is via
three connectors.
J
I
provides
control
signals
for
the drive
(see Figure 3-2).
J2
provides
for
the radial
connection
of
readlwrite
data signals
(see Figure 3-3). J3 provides for D.C.
power
(see Figure
3-4).
Table
3-l
contains interface lines. The interface
description of
the connectors, and the location
of
each, is contained
in this
section,
J1/Pl
CONNECTOR
Connection
to
J
I
is through a thirty-four-pin
cir-
cuit
board connector. Figure 3-2
contains
the
dimensions
of
this
connector.
The pins
are
numbered
I
through
34.
The
even
pins are located
on the component
side
of
the circuit board.
pin
z
is located on the end of
the circuit board connec-
tor
closest
to
the
D. C,
power connector
J3/p3,
and
is labeled.
A
key slot
is
provided between pins
4 and 6. The recommended mating connector
for
P
I is
3M
ribbon
connector
P/N
3463-0001
,
without
ears.
J2IP2 CONNECTOR
Connection
to
J2
is
through
a
20-pin circuit board
edge connector. Figure 3-3 contains the
dimen-
sions
of
this connector. The pins
are numbered
I
through
20. The
even
pins are located on the com-
ponent
side
of
the circuit board. The recommend-
ed mating connector
for
P2 is 3M ribbon connec-
tor P/N
3461
-0001,
without
ears.
A
key slot
is
pro-
vided between Pins 4 and
6.
3-3