Operating instructions

PUSHBUTTON
SWITCHES . Removal and replacement
instructions for pushbutton switches are shown in Figure
4-11 .
SEMICONDUCTORS
To avoid component damage, power must be
turned
off before removing
or
replacing
semiconductors .
Semiconductors should not be replaced unless actually
defective . If semiconductors are removed during routine
maintenance, return them to their original sockets .
Unnecessary replacement of semiconductors may affect
the adjustment of this instrument . When semiconductors
are replaced, check the operation of that part of the
instrument
which may be affected .
Handle silicone grease with care . Avoid
getting silicone grease in eyes . Wash hands
throroughly after use .
Replacement devices should be of the original type or a
direct replacement .
Figure 4-2
shows the lead
configurations of the semiconductor devices used in this
instrument .
Some plastic-case transistors
have lead
configurations that do not agree with those shown here .
When replacing, check the manufacturer's lead
configuration diagram . All transistor sockets in this
instrument are wired for the standard lead configuration
used for metal-case transistors . Semiconductors that
have heat radiators use silicone grease to increase heat
transfer
. Replace the silicone
grease when replacing
these semiconductors .
An extraction tool should be used to remove the 14-
and
16-pin integrated circuits to prevent damage to the pins .
This tool is available from Tektronix, Inc . Order Tektronix
part 003-0619-00 . If an extraction tool is not available
when removing one of these integrated circuits, pull
slowly and evenly on both ends of the device . Try to avoid
having one end of the integrated circuit disengage from
the socket before the other, as the pins
may be damaged .
INTERCONNECTING
PINS
Three
methods of interconnectionare used to connect
the circuit boardswith other boards andcomponents .
When the
interconnection is made with a coaxial cable, a
special end-lead connector plugs into a socket on the
board (Fig . 4-8) . When the interconnection is made with
a wire lead, an end-lead connector is used
which
mates
with the
interconnecting pin soldered into the board (Fig .
4-4) . When the
interconnection
is
made between
adjacent boards, an inter-board multi-pin connector is
used
(Fig . 4-3) . The following informaton provides the
removal and replacement procedure for the various types
of interconnection methods .
CIRCUIT-BOARD
PINS
AC

UTION
Maintenance---71387
COAXIAL END-LEAD CONNECTORS . Replacement of
the coaxial-type end-lead connectors requires special
tools and techniques ; only experienced maintenance
personnel should attempt to remove
and
replace these
connectors . It is recommended that the cable be replaced
as
a unit . For cable part numbers see the Replaceable
Mechanical Parts list . An alternative solution is to refer
the replacement of
the defective connector to your
local
Tektronix Field Office or representative .
END-LEAD CONNECTORS . The pin connectors used to
connect the wires to the interconnecting pins are
clamped to the ends of the associated leads . Toremove
and replace damaged end-lead pin connectors, remove
the old pin connector from the end of the lead and clamp
the replacement connector to the lead .
Some of the pin connectors are grouped together and
mounted
in a plastic holder ; the overall result
is that
these connectors are removedand installed as
a multi-
pin connector (see Fig . 4-4) . To provide correct
orientation of this multi-pin connector when it is
replaced, an arrow is marked on the circuit board and a
matching arrow is molded into the plastic holder of the
multi-pin connector
.
Be sure these arrows are aligned as
the multi-pin connector is replaced . If the individual end-
lead
pin
connectors
are removed from
the plastic holder,
note the color of the
individual wires for
replacement .
INTER-BOARD MULTI-PIN CONNECTOR . The inter-
board multi-pin connector pin-holder is not repairable
and shouldbe replaced as a unit (see Fig . 4-3) . Refer to
the Replaceable Mechanical Parts list for part number .
Inter-board multi-pin connector pin-sockets are soldered
to circuit boards (see Fig . 4-3) . To replace a socket, first
remove the guide . Then, remove the old socket using
soldering techniques previously described . Solder the
new socket in place, making sure it will align properly
with the inter-board connector pins .
All circuit boards in this instrument, except
the Readout circuit board, are multilayer type
boards with a conductive path(s)
laminated
between the top
and bottomboard layers . All
soldering on these boardsshould be done
with extreme care to prevent breaking the
connection to the center conductor(s), only
experienced maintenance personnelshould
attempt repair on these boards .
A circuit-board pin replacement kit including the
necessary tools, instructions, and replacement pins is
available from Tektronix, Inc . Order Tektronix part 040-
0542-00 .
Replacement
of
circuit-board pins on multi-
layer
boards is not recommended ; refer such repairs to
your local
Tektronix Field Office or representative .
To
replace a damaged pin which is mounted on a single-
layer circuit board, first disconnect any pin connectors .
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