Operating instructions

WARNING
Handle silicone grease with care . Avoid getting
silicone grease in eyes . Wash hands thoroughly
after use .
Replacement devices should be of the original type or a
direct replacement . Figure 4-2 shows the lead configura-
tions 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 basing diagram for correct basing . All
transistor sockets in this instrument are wired for the stan-
dard basing 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 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 (Figure 4-8) .
When the interconnection is made with a wire lead, an end-
lead connector is used which mates with the interconnect-
ing pin soldered into the board (Figure 4-4) . When the
interconnection is made between adjacent boards, an inter-
board multi-pin connector is used (Figure 4-3) . The
following information provides the removal and replacement
procedure for the various types of interconnection methods .
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 .
CIRCUIT-BOARD PINS .
Maintenance-71380
END-LEAD
PIN
CONNECTORS .
The
pin
connectors used
to connect the wires to the interconnecting pins are
clamped to
the ends
of the associated
leads .
To
remove and
replace damaged end-lead pin connectors,
remove the old
pin connector from the end of the lead and
clamp
the re-
placement 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 removed and
installed as
a
multi-pin
connec-
tor (see Figure
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
should be replaced as a unit (see Figure 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 Figure 4-3) . To replace a socket, first
remove the guide . Then, remove the old socket
using solder-
ing
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 bottom board layers . A// soldering
on these boards should be done with extreme
care to prevent breaking the connection to the
center conductor(s) ; only experienced mainte-
nance personnelshould attempt repair of 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 . Re-
placement of circuit-board pins on multi-layer boards is
not recommended ; refer such repairs to your local Tek-
tronix Field Office or representative .