Tektronix 7A29 Instruction Manual page 41

Maintenance-
7A29
If
a
component
adjacent
to
a
HYPCON
connector
must
be
replaced, the following steps are
recommended
1
Remove
the hybrid 1C
and
HYPCON
connector
(see
Disassembly
and Removal
instructions)
before any
soldering or cleaning,
and
store in
a dirt-free covered
container.
2.
Hand
soldering
a.
Use small-diameter
solder
(0
030"-0
040").
b
Use low-wattage
soldering
iron
(15
to
20
watts).
c.
Use care with solder
amount and
placement.
3
Remove
solder flux
and
contact contamination with
isopropyl alcohol
4.
Flush the hybrid
and
HYPCON
connector
mounting
area
with isopropyl alcohol.
Do
not
scrub with a
cotton
-
tipped applicator,
as
cotton fibers will
adhere
to
edges
and
surfaces
of
contact areas
and cause open
or
intermittent connections.
The
elastomer should be
examined
under
light for dust, hair, etc.
before
it
is
re
installed
If
the etched circuit
board surfaces
require
more
cleaning,
scrub with a
soft
rubber eraser
and blow
or
vacuum
clean while dusting surface
with
a
small clean
brush.
5.
If
the hybrid
1C
and elastomer contact holder are
contaminated, clean the
contact holder and hybrid by
flushing or
spraying with alcohol
and oven
dry
at
50°
C.
Do
not
scrub with
a
cotton-tipped applicator or similar
device.
If
the contact holder
is
excessively contaminated,
replace
it
with a
new
one.
Two
inch-pounds
of
torque should be applied
to
the
mounting screws
to
secure
the
HYPCON
to
the
circuit
board
Make
sure
that the
elastomer
is
properly seated
in
the
contact holder before
remounting the assembly
to
the
circuit
board.
The
elastomer
is
keyed
to
fit
snugly
in
the
plastic
holder
in
only
one
orientation
Exercise care
when
mounting
the
frame-elastomer connector
holder-hybrid
1C
assembly
to
the
circuit
board
to
prevent misalignment
between the connector and board
>
CAUTION
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•>
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Because
of close tolerances
involved, special
care
must
be taken
to
ensure
correct
index
alignment
of
each
HYPCON
part
during
reassembly.
Failure to
do so can
result
in
a
cracked
hybrid
substrate.
See
Figure
4 6
for
index locations
When
replacing the
hybrid, insert
it
into
the board
opening and
then position
the
HYPCON
connector
in
the
board
registration
holes
for
perfect
alignment
The
outer
portion
of
the
HYPCON
frame should be
flush
with
the
circuit
board
before the four
mounting screws
are
tightened
Avoid touching the
hybrid
and
elastomer
contact holder with your
fingers, finger
oils
can degrade
reliability
A
procedure
for
removal and replacement
is
included
in
Figure
4-6
Hybrid substrate contact
numbers
1
and 20 are printed
on the substrate
at
the index corner.
See
Figure 4-2,
Semiconductor Lead Configurations
INTERCONNECTING
METHODS
Three methods
of
interconnection are
used
to
connect
the
circuit
boards with
other
boards and components.
When
the interconnection
is
made
with
a coaxial cable, a
special
end-lead connector plugs
into a
socket
on
the
board
(Fig.
4-7).
When
the interconnection
is
made
with
a
wire
lead,
an
end-
lead
connector
is
used
which mates
with the interconnecting
pm
soldered
into
the board
(Fig
4
4)
When
the interconnection
is
made
between
adjacent boards,
an
interboard multi-pin
connector
is
used
(Fig
4-3)
The following information provides the
removal
and replacement procedure
for
the various types
of
interconnection
methods
Figure 4-7. Coaxial end-load connector assembly.
4-15