Maintenance—
Type
3B5
Circuit
Boards
and
Cards.
Use
ordinary
60/40
solder
and
a
35-
to
40-watt
pencil
type
soldering
iron
on
the
circuit
boards
and
cards.
The
tip
of
the
iron
should
be
clean
and
properly tinned
for
best
heat
transfer
to
the
solder
joint.
A
higher
wattage soldering
iron
may
separate the
wiring
from
the
base
material.
The
following
technique
should
be
used
to
replace
a
com
ponent
on
a
circuit
board
or
card.
Most
components
can
be
replaced
without
removing
the
boards
from
the
instrument.
The
cards
should
be
removed
to
replace
comoonents (see
Circuit
Card
Replacement
in
this
section).
1.
Grip
the
component
lead
with
long-nose
pliers.
Touch
the
soldering
iron
to
the
lead
at
the
solder
connection. Do
not
lay
the
iron
directly
on
the
board
as
it
may
damage
the
board.
2.
When
the
solder
begins
to
melt, pull
the
lead
out
gently.
This
should leave
a clean
hole in
the
board.
If
not,
the
hole
can
be
cleaned
by
reheating
the
solder
and
placing
a
sharp
object
such
as
a
toothpick
into
the
hole
to
clean
it
out.
3.
Bend
the
leads
of the new
component
to
fit
the
holes
in
the
board.
If
the
component
is
replaced
while
the
board
is
mounted
in
the
instrument,
cut
the
leads
long
enough so
they
just
protrude
through
the
board.
Insert
the
leads
into
the
holes
in
the
board so
the
component
is
firmly
seated
against
the
board
(or
as positioned
originally).
If
it
does
not
seat
properly,
heat
the
solder
and
gently
press
the
component
into
place.
4.
Touch
the iron
to
the connection and
apply
a
small
amount
of
solder
to
make
a
firm
solder
joint.
To
protect
heat-sensitive
components,
hold
the
lead
between
the
com
ponent
body
and
the
solder
joint
with
a
pair
of
long-nose
pliers
or
other
heat
sink.
5. Clip
the
excess
lead
that
protrudes
through
the
board.
6.
Clean
the
area
around
the
solder
connection
with
a
flux-remover
solvent.
Be
careful
not
to
remove
information
printed
on
the
board.
Ceramic
Terminal
Strips.
Solder
used
on the
ceramic
terminal
strips
should
contain
about
3%
silver.
Use
a
40-
to
75-watt
soldering
iron
with
a
1/
8
-inch
wide
wedge-shaped
tip.
Ordinary
solder
can
be
used
occasionally
without
dam
age
to the ceramic
terminal strips.
However,
if
ordinary
solder
is
used repeatedly
or
if
excessive
heat
is
applied,
the
solder-to-ceramic
bond
may be
broken.
Solder
containing
3%
silver is
usually
available
locally
or
it
can
be
purchased
from
Tektronix
in
one-pound
rolls; order
by
Tektronix
Part
Number
251-0514-00.
Observe
the
following
precautions
when
soldering
to
ceramic
terminal
strips.
1.
Use
a
hot
iron
for
a short
time.
Apply
only
enough
heat
to
make
the
solder
flow
freely.
2.
Maintain
a
clean,
properly
tinned
tip.
3.
Avoid putting
pressure
on
the
ceramic
terminal
strip.
4.
Do
not attempt to
fill
the
terminal-strip
notch
with
solder;
use
only
enough
solder
to
cover
the
wires
adequately.
5.
Clean
the
flux from
the
terminal
strip
with
a
flux
remover
solvent.
Metal
Terminals.
When
soldering
metal terminals (e.g.,
switch
terminals,
potentiometers,
etc.),
ordinary 60/40
solder
can
be
used.
Use
a soldering
iron
with
a
40-
to
75-watt
rating
and
a '/8-inch
wide
wedge-shaped
tip.
Observe
the
following
precautions
when
soldering
metal
terminals:
1.
Apply
only
enough heat
to
make
the
solder
flow
freely.
2.
Apply
only
enough
solder
to
form
a
solid connection.
Excess solder
may
impair
the
function
of
the
part.
3.
If
a wire
extends
beyond
the
solder
joint,
clip
off
the
excess.
4.
Clean
the
flux
from
the
solder
joint
with
a
flux-remover
solvent.
Component
Replacement
WARNING
Disconnect
the
instrument
from
the power source
before
replacing
components.
Ceramic
Terminal
Strip
Replacement.
A complete
cera
mic
terminal
strip
assembly
is
shown
in Fig.
4-2.
Replace
ment
strips (including
studs)
and
spacers
are
supplied
under
separate
part
numbers.
However,
the
old
spacers
may
be
re-used
if
they
are
not
damaged.
The
applicable
Tektronix
Part
Numbers
for
the
ceramic
strips
and
spacers
used
in
this
instrument are
given
in
the
Mechanical
Parts
List.
Fig. 4-2. Ceramic
terminal
strip assembly
To
replace
a
ceramic
terminal
strip,
use
the
following
procedure:
REMOVAL:
1. Unsolder
all
components
and
connections
on
the
strip.
To
aid
in
replacing
the
strip,
it
may
be
advisable
to
mark
each lead or draw
a
sketch
to show
location
of
the
com
ponents
and
connections.
2.
Pry or
pull
the
damaged
strip
from
the
chassis.
3. If
the
spacers
come
out
with
the
strip,
remove
them
from
the
stud
pins
for
use
on
the
new
strip
(spacers should
be
replaced
if
they
are
damaged).
4-6
Содержание 3B5
Страница 4: ...Fig 1 1 Type 3B5 Automatic Programmable Time Base unit Type 3B5...
Страница 15: ...Operating Instructions Type 3B5 TYPE 3B5 CONTROL SET UP CHART Fig 2 2 Control set up chart 2 7...
Страница 48: ...CO I o Fig 3 13 Delay and Timing Circuit logic block diagram Circuit Description Type 3B5...
Страница 61: ...GO i GO GO Fig 3 22 Seek Ciicuit Logic block diagram Circuit Description Type 3B5...
Страница 70: ...u k KJ Fig 3 29 Circuit conditions for Manual Mode operation Circuit Description Type 3B5...
Страница 71: ...w K w Fig 3 30 Circuit conditions for Seek Mode operation Circuit Description Type 3B5...
Страница 72: ...w I u U Fig 3 31 Circuit condition for External Mode operation Circuit Description Type 3B5...
Страница 88: ...Maintenance Type 3B5 Fig 4 9 Location of components on Logic Card 4 14...
Страница 89: ...u Oi Fig 4 10 Location of components on Counter Card Maintenance Type 3B5...
Страница 92: ...NOTES I...
Страница 104: ...NOTES...
Страница 106: ...Calibration Type 3B5 Fig 6 1 Recommended calibration equipment...
Страница 160: ......
Страница 176: ...J400 RtADOUT BOARD 3B5 PLUG IN A READOUT...
Страница 182: ...397 R E A D O U T B O A R D 10 6b READOUT BOARD...
Страница 184: ...FIG 1 FRONT SWITCHES TYPE 3B5 AUTOMATIC PROGRAMMABLE TIME BASE...
Страница 185: ...FIG 2 CHASSIS REAR 3 GS to TYPE 3B5 AUTOMATIC PROGRAMMABLE TIME BASE...
Страница 186: ...OPTIONAL ACCESSORIES...